linux/arch/sparc64/mm/init.c

1890 lines
49 KiB
C
Raw Normal View History

/* $Id: init.c,v 1.209 2002/02/09 19:49:31 davem Exp $
* arch/sparc64/mm/init.c
*
* Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/initrd.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/poison.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/kprobes.h>
#include <linux/cache.h>
#include <linux/sort.h>
#include <asm/head.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/iommu.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/dma.h>
#include <asm/starfire.h>
#include <asm/tlb.h>
#include <asm/spitfire.h>
#include <asm/sections.h>
#include <asm/tsb.h>
#include <asm/hypervisor.h>
#include <asm/prom.h>
extern void device_scan(void);
#define MAX_PHYS_ADDRESS (1UL << 42UL)
#define KPTE_BITMAP_CHUNK_SZ (256UL * 1024UL * 1024UL)
#define KPTE_BITMAP_BYTES \
((MAX_PHYS_ADDRESS / KPTE_BITMAP_CHUNK_SZ) / 8)
unsigned long kern_linear_pte_xor[2] __read_mostly;
/* A bitmap, one bit for every 256MB of physical memory. If the bit
* is clear, we should use a 4MB page (via kern_linear_pte_xor[0]) else
* if set we should use a 256MB page (via kern_linear_pte_xor[1]).
*/
unsigned long kpte_linear_bitmap[KPTE_BITMAP_BYTES / sizeof(unsigned long)];
/* A special kernel TSB for 4MB and 256MB linear mappings. */
struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
#define MAX_BANKS 32
static struct linux_prom64_registers pavail[MAX_BANKS] __initdata;
static struct linux_prom64_registers pavail_rescan[MAX_BANKS] __initdata;
static int pavail_ents __initdata;
static int pavail_rescan_ents __initdata;
static int cmp_p64(const void *a, const void *b)
{
const struct linux_prom64_registers *x = a, *y = b;
if (x->phys_addr > y->phys_addr)
return 1;
if (x->phys_addr < y->phys_addr)
return -1;
return 0;
}
static void __init read_obp_memory(const char *property,
struct linux_prom64_registers *regs,
int *num_ents)
{
int node = prom_finddevice("/memory");
int prop_size = prom_getproplen(node, property);
int ents, ret, i;
ents = prop_size / sizeof(struct linux_prom64_registers);
if (ents > MAX_BANKS) {
prom_printf("The machine has more %s property entries than "
"this kernel can support (%d).\n",
property, MAX_BANKS);
prom_halt();
}
ret = prom_getproperty(node, property, (char *) regs, prop_size);
if (ret == -1) {
prom_printf("Couldn't get %s property from /memory.\n");
prom_halt();
}
/* Sanitize what we got from the firmware, by page aligning
* everything.
*/
for (i = 0; i < ents; i++) {
unsigned long base, size;
base = regs[i].phys_addr;
size = regs[i].reg_size;
size &= PAGE_MASK;
if (base & ~PAGE_MASK) {
unsigned long new_base = PAGE_ALIGN(base);
size -= new_base - base;
if ((long) size < 0L)
size = 0UL;
base = new_base;
}
regs[i].phys_addr = base;
regs[i].reg_size = size;
}
for (i = 0; i < ents; i++) {
if (regs[i].reg_size == 0UL) {
int j;
for (j = i; j < ents - 1; j++) {
regs[j].phys_addr =
regs[j+1].phys_addr;
regs[j].reg_size =
regs[j+1].reg_size;
}
ents--;
i--;
}
}
*num_ents = ents;
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
sort(regs, ents, sizeof(struct linux_prom64_registers),
cmp_p64, NULL);
}
unsigned long *sparc64_valid_addr_bitmap __read_mostly;
/* Kernel physical address base and size in bytes. */
unsigned long kern_base __read_mostly;
unsigned long kern_size __read_mostly;
/* get_new_mmu_context() uses "cache + 1". */
DEFINE_SPINLOCK(ctx_alloc_lock);
unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
#define CTX_BMAP_SLOTS (1UL << (CTX_NR_BITS - 6))
unsigned long mmu_context_bmap[CTX_BMAP_SLOTS];
/* References to special section boundaries */
extern char _start[], _end[];
/* Initial ramdisk setup */
extern unsigned long sparc_ramdisk_image64;
extern unsigned int sparc_ramdisk_image;
extern unsigned int sparc_ramdisk_size;
struct page *mem_map_zero __read_mostly;
unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly;
unsigned long sparc64_kern_pri_context __read_mostly;
unsigned long sparc64_kern_pri_nuc_bits __read_mostly;
unsigned long sparc64_kern_sec_context __read_mostly;
int bigkernel = 0;
kmem_cache_t *pgtable_cache __read_mostly;
static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
{
clear_page(addr);
}
extern void tsb_cache_init(void);
void pgtable_cache_init(void)
{
pgtable_cache = kmem_cache_create("pgtable_cache",
PAGE_SIZE, PAGE_SIZE,
SLAB_HWCACHE_ALIGN |
SLAB_MUST_HWCACHE_ALIGN,
zero_ctor,
NULL);
if (!pgtable_cache) {
prom_printf("Could not create pgtable_cache\n");
prom_halt();
}
tsb_cache_init();
}
#ifdef CONFIG_DEBUG_DCFLUSH
atomic_t dcpage_flushes = ATOMIC_INIT(0);
#ifdef CONFIG_SMP
atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
#endif
#endif
inline void flush_dcache_page_impl(struct page *page)
{
BUG_ON(tlb_type == hypervisor);
#ifdef CONFIG_DEBUG_DCFLUSH
atomic_inc(&dcpage_flushes);
#endif
#ifdef DCACHE_ALIASING_POSSIBLE
__flush_dcache_page(page_address(page),
((tlb_type == spitfire) &&
page_mapping(page) != NULL));
#else
if (page_mapping(page) != NULL &&
tlb_type == spitfire)
__flush_icache_page(__pa(page_address(page)));
#endif
}
#define PG_dcache_dirty PG_arch_1
#define PG_dcache_cpu_shift 24UL
#define PG_dcache_cpu_mask (256UL - 1UL)
#if NR_CPUS > 256
#error D-cache dirty tracking and thread_info->cpu need fixing for > 256 cpus
#endif
#define dcache_dirty_cpu(page) \
(((page)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
static __inline__ void set_dcache_dirty(struct page *page, int this_cpu)
{
unsigned long mask = this_cpu;
unsigned long non_cpu_bits;
non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift);
mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty);
__asm__ __volatile__("1:\n\t"
"ldx [%2], %%g7\n\t"
"and %%g7, %1, %%g1\n\t"
"or %%g1, %0, %%g1\n\t"
"casx [%2], %%g7, %%g1\n\t"
"cmp %%g7, %%g1\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"bne,pn %%xcc, 1b\n\t"
" nop"
: /* no outputs */
: "r" (mask), "r" (non_cpu_bits), "r" (&page->flags)
: "g1", "g7");
}
static __inline__ void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
{
unsigned long mask = (1UL << PG_dcache_dirty);
__asm__ __volatile__("! test_and_clear_dcache_dirty\n"
"1:\n\t"
"ldx [%2], %%g7\n\t"
"srlx %%g7, %4, %%g1\n\t"
"and %%g1, %3, %%g1\n\t"
"cmp %%g1, %0\n\t"
"bne,pn %%icc, 2f\n\t"
" andn %%g7, %1, %%g1\n\t"
"casx [%2], %%g7, %%g1\n\t"
"cmp %%g7, %%g1\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"bne,pn %%xcc, 1b\n\t"
" nop\n"
"2:"
: /* no outputs */
: "r" (cpu), "r" (mask), "r" (&page->flags),
"i" (PG_dcache_cpu_mask),
"i" (PG_dcache_cpu_shift)
: "g1", "g7");
}
static inline void tsb_insert(struct tsb *ent, unsigned long tag, unsigned long pte)
{
unsigned long tsb_addr = (unsigned long) ent;
if (tlb_type == cheetah_plus || tlb_type == hypervisor)
tsb_addr = __pa(tsb_addr);
__tsb_insert(tsb_addr, tag, pte);
}
unsigned long _PAGE_ALL_SZ_BITS __read_mostly;
unsigned long _PAGE_SZBITS __read_mostly;
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
struct mm_struct *mm;
struct tsb *tsb;
[SPARC64]: Fix and re-enable dynamic TSB sizing. This is good for up to %50 performance improvement of some test cases. The problem has been the race conditions, and hopefully I've plugged them all up here. 1) There was a serious race in switch_mm() wrt. lazy TLB switching to and from kernel threads. We could erroneously skip a tsb_context_switch() and thus use a stale TSB across a TSB grow event. There is a big comment now in that function describing exactly how it can happen. 2) All code paths that do something with the TSB need to be guarded with the mm->context.lock spinlock. This makes page table flushing paths properly synchronize with both TSB growing and TLB context changes. 3) TSB growing events are moved to the end of successful fault processing. Previously it was in update_mmu_cache() but that is deadlock prone. At the end of do_sparc64_fault() we hold no spinlocks that could deadlock the TSB grow sequence. We also have dropped the address space semaphore. While we're here, add prefetching to the copy_tsb() routine and put it in assembler into the tsb.S file. This piece of code is quite time critical. There are some small negative side effects to this code which can be improved upon. In particular we grab the mm->context.lock even for the tsb insert done by update_mmu_cache() now and that's a bit excessive. We can get rid of that locking, and the same lock taking in flush_tsb_user(), by disabling PSTATE_IE around the whole operation including the capturing of the tsb pointer and tsb_nentries value. That would work because anyone growing the TSB won't free up the old TSB until all cpus respond to the TSB change cross call. I'm not quite so confident in that optimization to put it in right now, but eventually we might be able to and the description is here for reference. This code seems very solid now. It passes several parallel GCC bootstrap builds, and our favorite "nut cruncher" stress test which is a full "make -j8192" build of a "make allmodconfig" kernel. That puts about 256 processes on each cpu's run queue, makes lots of process cpu migrations occur, causes lots of page table and TLB flushing activity, incurs many context version number changes, and it swaps the machine real far out to disk even though there is 16GB of ram on this test system. :-) Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-16 10:02:32 +00:00
unsigned long tag, flags;
unsigned long tsb_index, tsb_hash_shift;
if (tlb_type != hypervisor) {
unsigned long pfn = pte_pfn(pte);
unsigned long pg_flags;
struct page *page;
if (pfn_valid(pfn) &&
(page = pfn_to_page(pfn), page_mapping(page)) &&
((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
PG_dcache_cpu_mask);
int this_cpu = get_cpu();
/* This is just to optimize away some function calls
* in the SMP case.
*/
if (cpu == this_cpu)
flush_dcache_page_impl(page);
else
smp_flush_dcache_page_impl(page, cpu);
clear_dcache_dirty_cpu(page, cpu);
put_cpu();
}
}
mm = vma->vm_mm;
[SPARC64]: Fix and re-enable dynamic TSB sizing. This is good for up to %50 performance improvement of some test cases. The problem has been the race conditions, and hopefully I've plugged them all up here. 1) There was a serious race in switch_mm() wrt. lazy TLB switching to and from kernel threads. We could erroneously skip a tsb_context_switch() and thus use a stale TSB across a TSB grow event. There is a big comment now in that function describing exactly how it can happen. 2) All code paths that do something with the TSB need to be guarded with the mm->context.lock spinlock. This makes page table flushing paths properly synchronize with both TSB growing and TLB context changes. 3) TSB growing events are moved to the end of successful fault processing. Previously it was in update_mmu_cache() but that is deadlock prone. At the end of do_sparc64_fault() we hold no spinlocks that could deadlock the TSB grow sequence. We also have dropped the address space semaphore. While we're here, add prefetching to the copy_tsb() routine and put it in assembler into the tsb.S file. This piece of code is quite time critical. There are some small negative side effects to this code which can be improved upon. In particular we grab the mm->context.lock even for the tsb insert done by update_mmu_cache() now and that's a bit excessive. We can get rid of that locking, and the same lock taking in flush_tsb_user(), by disabling PSTATE_IE around the whole operation including the capturing of the tsb pointer and tsb_nentries value. That would work because anyone growing the TSB won't free up the old TSB until all cpus respond to the TSB change cross call. I'm not quite so confident in that optimization to put it in right now, but eventually we might be able to and the description is here for reference. This code seems very solid now. It passes several parallel GCC bootstrap builds, and our favorite "nut cruncher" stress test which is a full "make -j8192" build of a "make allmodconfig" kernel. That puts about 256 processes on each cpu's run queue, makes lots of process cpu migrations occur, causes lots of page table and TLB flushing activity, incurs many context version number changes, and it swaps the machine real far out to disk even though there is 16GB of ram on this test system. :-) Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-16 10:02:32 +00:00
tsb_index = MM_TSB_BASE;
tsb_hash_shift = PAGE_SHIFT;
[SPARC64]: Fix and re-enable dynamic TSB sizing. This is good for up to %50 performance improvement of some test cases. The problem has been the race conditions, and hopefully I've plugged them all up here. 1) There was a serious race in switch_mm() wrt. lazy TLB switching to and from kernel threads. We could erroneously skip a tsb_context_switch() and thus use a stale TSB across a TSB grow event. There is a big comment now in that function describing exactly how it can happen. 2) All code paths that do something with the TSB need to be guarded with the mm->context.lock spinlock. This makes page table flushing paths properly synchronize with both TSB growing and TLB context changes. 3) TSB growing events are moved to the end of successful fault processing. Previously it was in update_mmu_cache() but that is deadlock prone. At the end of do_sparc64_fault() we hold no spinlocks that could deadlock the TSB grow sequence. We also have dropped the address space semaphore. While we're here, add prefetching to the copy_tsb() routine and put it in assembler into the tsb.S file. This piece of code is quite time critical. There are some small negative side effects to this code which can be improved upon. In particular we grab the mm->context.lock even for the tsb insert done by update_mmu_cache() now and that's a bit excessive. We can get rid of that locking, and the same lock taking in flush_tsb_user(), by disabling PSTATE_IE around the whole operation including the capturing of the tsb pointer and tsb_nentries value. That would work because anyone growing the TSB won't free up the old TSB until all cpus respond to the TSB change cross call. I'm not quite so confident in that optimization to put it in right now, but eventually we might be able to and the description is here for reference. This code seems very solid now. It passes several parallel GCC bootstrap builds, and our favorite "nut cruncher" stress test which is a full "make -j8192" build of a "make allmodconfig" kernel. That puts about 256 processes on each cpu's run queue, makes lots of process cpu migrations occur, causes lots of page table and TLB flushing activity, incurs many context version number changes, and it swaps the machine real far out to disk even though there is 16GB of ram on this test system. :-) Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-16 10:02:32 +00:00
spin_lock_irqsave(&mm->context.lock, flags);
#ifdef CONFIG_HUGETLB_PAGE
if (mm->context.tsb_block[MM_TSB_HUGE].tsb != NULL) {
if ((tlb_type == hypervisor &&
(pte_val(pte) & _PAGE_SZALL_4V) == _PAGE_SZHUGE_4V) ||
(tlb_type != hypervisor &&
(pte_val(pte) & _PAGE_SZALL_4U) == _PAGE_SZHUGE_4U)) {
tsb_index = MM_TSB_HUGE;
tsb_hash_shift = HPAGE_SHIFT;
}
}
#endif
tsb = mm->context.tsb_block[tsb_index].tsb;
tsb += ((address >> tsb_hash_shift) &
(mm->context.tsb_block[tsb_index].tsb_nentries - 1UL));
tag = (address >> 22UL);
tsb_insert(tsb, tag, pte_val(pte));
[SPARC64]: Fix and re-enable dynamic TSB sizing. This is good for up to %50 performance improvement of some test cases. The problem has been the race conditions, and hopefully I've plugged them all up here. 1) There was a serious race in switch_mm() wrt. lazy TLB switching to and from kernel threads. We could erroneously skip a tsb_context_switch() and thus use a stale TSB across a TSB grow event. There is a big comment now in that function describing exactly how it can happen. 2) All code paths that do something with the TSB need to be guarded with the mm->context.lock spinlock. This makes page table flushing paths properly synchronize with both TSB growing and TLB context changes. 3) TSB growing events are moved to the end of successful fault processing. Previously it was in update_mmu_cache() but that is deadlock prone. At the end of do_sparc64_fault() we hold no spinlocks that could deadlock the TSB grow sequence. We also have dropped the address space semaphore. While we're here, add prefetching to the copy_tsb() routine and put it in assembler into the tsb.S file. This piece of code is quite time critical. There are some small negative side effects to this code which can be improved upon. In particular we grab the mm->context.lock even for the tsb insert done by update_mmu_cache() now and that's a bit excessive. We can get rid of that locking, and the same lock taking in flush_tsb_user(), by disabling PSTATE_IE around the whole operation including the capturing of the tsb pointer and tsb_nentries value. That would work because anyone growing the TSB won't free up the old TSB until all cpus respond to the TSB change cross call. I'm not quite so confident in that optimization to put it in right now, but eventually we might be able to and the description is here for reference. This code seems very solid now. It passes several parallel GCC bootstrap builds, and our favorite "nut cruncher" stress test which is a full "make -j8192" build of a "make allmodconfig" kernel. That puts about 256 processes on each cpu's run queue, makes lots of process cpu migrations occur, causes lots of page table and TLB flushing activity, incurs many context version number changes, and it swaps the machine real far out to disk even though there is 16GB of ram on this test system. :-) Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-16 10:02:32 +00:00
spin_unlock_irqrestore(&mm->context.lock, flags);
}
void flush_dcache_page(struct page *page)
{
struct address_space *mapping;
int this_cpu;
if (tlb_type == hypervisor)
return;
/* Do not bother with the expensive D-cache flush if it
* is merely the zero page. The 'bigcore' testcase in GDB
* causes this case to run millions of times.
*/
if (page == ZERO_PAGE(0))
return;
this_cpu = get_cpu();
mapping = page_mapping(page);
if (mapping && !mapping_mapped(mapping)) {
int dirty = test_bit(PG_dcache_dirty, &page->flags);
if (dirty) {
int dirty_cpu = dcache_dirty_cpu(page);
if (dirty_cpu == this_cpu)
goto out;
smp_flush_dcache_page_impl(page, dirty_cpu);
}
set_dcache_dirty(page, this_cpu);
} else {
/* We could delay the flush for the !page_mapping
* case too. But that case is for exec env/arg
* pages and those are %99 certainly going to get
* faulted into the tlb (and thus flushed) anyways.
*/
flush_dcache_page_impl(page);
}
out:
put_cpu();
}
void __kprobes flush_icache_range(unsigned long start, unsigned long end)
{
/* Cheetah and Hypervisor platform cpus have coherent I-cache. */
if (tlb_type == spitfire) {
unsigned long kaddr;
for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE)
__flush_icache_page(__get_phys(kaddr));
}
}
void show_mem(void)
{
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n",
nr_swap_pages << (PAGE_SHIFT-10));
printk("%ld pages of RAM\n", num_physpages);
printk("%d free pages\n", nr_free_pages());
}
void mmu_info(struct seq_file *m)
{
if (tlb_type == cheetah)
seq_printf(m, "MMU Type\t: Cheetah\n");
else if (tlb_type == cheetah_plus)
seq_printf(m, "MMU Type\t: Cheetah+\n");
else if (tlb_type == spitfire)
seq_printf(m, "MMU Type\t: Spitfire\n");
else if (tlb_type == hypervisor)
seq_printf(m, "MMU Type\t: Hypervisor (sun4v)\n");
else
seq_printf(m, "MMU Type\t: ???\n");
#ifdef CONFIG_DEBUG_DCFLUSH
seq_printf(m, "DCPageFlushes\t: %d\n",
atomic_read(&dcpage_flushes));
#ifdef CONFIG_SMP
seq_printf(m, "DCPageFlushesXC\t: %d\n",
atomic_read(&dcpage_flushes_xcall));
#endif /* CONFIG_SMP */
#endif /* CONFIG_DEBUG_DCFLUSH */
}
struct linux_prom_translation {
unsigned long virt;
unsigned long size;
unsigned long data;
};
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
/* Exported for kernel TLB miss handling in ktlb.S */
struct linux_prom_translation prom_trans[512] __read_mostly;
unsigned int prom_trans_ents __read_mostly;
/* Exported for SMP bootup purposes. */
unsigned long kern_locked_tte_data;
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
/* The obp translations are saved based on 8k pagesize, since obp can
* use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
* HI_OBP_ADDRESS range are handled in ktlb.S.
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
*/
static inline int in_obp_range(unsigned long vaddr)
{
return (vaddr >= LOW_OBP_ADDRESS &&
vaddr < HI_OBP_ADDRESS);
}
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
static int cmp_ptrans(const void *a, const void *b)
{
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
const struct linux_prom_translation *x = a, *y = b;
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
if (x->virt > y->virt)
return 1;
if (x->virt < y->virt)
return -1;
return 0;
}
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
/* Read OBP translations property into 'prom_trans[]'. */
static void __init read_obp_translations(void)
{
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
int n, node, ents, first, last, i;
node = prom_finddevice("/virtual-memory");
n = prom_getproplen(node, "translations");
if (unlikely(n == 0 || n == -1)) {
prom_printf("prom_mappings: Couldn't get size.\n");
prom_halt();
}
if (unlikely(n > sizeof(prom_trans))) {
prom_printf("prom_mappings: Size %Zd is too big.\n", n);
prom_halt();
}
if ((n = prom_getproperty(node, "translations",
(char *)&prom_trans[0],
sizeof(prom_trans))) == -1) {
prom_printf("prom_mappings: Couldn't get property.\n");
prom_halt();
}
n = n / sizeof(struct linux_prom_translation);
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
ents = n;
sort(prom_trans, ents, sizeof(struct linux_prom_translation),
cmp_ptrans, NULL);
/* Now kick out all the non-OBP entries. */
for (i = 0; i < ents; i++) {
if (in_obp_range(prom_trans[i].virt))
break;
}
first = i;
for (; i < ents; i++) {
if (!in_obp_range(prom_trans[i].virt))
break;
}
last = i;
for (i = 0; i < (last - first); i++) {
struct linux_prom_translation *src = &prom_trans[i + first];
struct linux_prom_translation *dest = &prom_trans[i];
*dest = *src;
}
for (; i < ents; i++) {
struct linux_prom_translation *dest = &prom_trans[i];
dest->virt = dest->size = dest->data = 0x0UL;
}
prom_trans_ents = last - first;
if (tlb_type == spitfire) {
/* Clear diag TTE bits. */
for (i = 0; i < prom_trans_ents; i++)
prom_trans[i].data &= ~0x0003fe0000000000UL;
}
}
static void __init hypervisor_tlb_lock(unsigned long vaddr,
unsigned long pte,
unsigned long mmu)
{
register unsigned long func asm("%o5");
register unsigned long arg0 asm("%o0");
register unsigned long arg1 asm("%o1");
register unsigned long arg2 asm("%o2");
register unsigned long arg3 asm("%o3");
func = HV_FAST_MMU_MAP_PERM_ADDR;
arg0 = vaddr;
arg1 = 0;
arg2 = pte;
arg3 = mmu;
__asm__ __volatile__("ta 0x80"
: "=&r" (func), "=&r" (arg0),
"=&r" (arg1), "=&r" (arg2),
"=&r" (arg3)
: "0" (func), "1" (arg0), "2" (arg1),
"3" (arg2), "4" (arg3));
if (arg0 != 0) {
prom_printf("hypervisor_tlb_lock[%lx:%lx:%lx:%lx]: "
"errors with %lx\n", vaddr, 0, pte, mmu, arg0);
prom_halt();
}
}
static unsigned long kern_large_tte(unsigned long paddr);
static void __init remap_kernel(void)
{
unsigned long phys_page, tte_vaddr, tte_data;
int tlb_ent = sparc64_highest_locked_tlbent();
tte_vaddr = (unsigned long) KERNBASE;
phys_page = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
tte_data = kern_large_tte(phys_page);
kern_locked_tte_data = tte_data;
/* Now lock us into the TLBs via Hypervisor or OBP. */
if (tlb_type == hypervisor) {
hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_DMMU);
hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_IMMU);
if (bigkernel) {
tte_vaddr += 0x400000;
tte_data += 0x400000;
hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_DMMU);
hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_IMMU);
}
} else {
prom_dtlb_load(tlb_ent, tte_data, tte_vaddr);
prom_itlb_load(tlb_ent, tte_data, tte_vaddr);
if (bigkernel) {
tlb_ent -= 1;
prom_dtlb_load(tlb_ent,
tte_data + 0x400000,
tte_vaddr + 0x400000);
prom_itlb_load(tlb_ent,
tte_data + 0x400000,
tte_vaddr + 0x400000);
}
sparc64_highest_unlocked_tlb_ent = tlb_ent - 1;
}
if (tlb_type == cheetah_plus) {
sparc64_kern_pri_context = (CTX_CHEETAH_PLUS_CTX0 |
CTX_CHEETAH_PLUS_NUC);
sparc64_kern_pri_nuc_bits = CTX_CHEETAH_PLUS_NUC;
sparc64_kern_sec_context = CTX_CHEETAH_PLUS_CTX0;
}
}
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
static void __init inherit_prom_mappings(void)
{
read_obp_translations();
/* Now fixup OBP's idea about where we really are mapped. */
prom_printf("Remapping the kernel... ");
remap_kernel();
prom_printf("done.\n");
}
void prom_world(int enter)
{
if (!enter)
set_fs((mm_segment_t) { get_thread_current_ds() });
__asm__ __volatile__("flushw");
}
#ifdef DCACHE_ALIASING_POSSIBLE
void __flush_dcache_range(unsigned long start, unsigned long end)
{
unsigned long va;
if (tlb_type == spitfire) {
int n = 0;
for (va = start; va < end; va += 32) {
spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
if (++n >= 512)
break;
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
start = __pa(start);
end = __pa(end);
for (va = start; va < end; va += 32)
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (va),
"i" (ASI_DCACHE_INVALIDATE));
}
}
#endif /* DCACHE_ALIASING_POSSIBLE */
/* Caller does TLB context flushing on local CPU if necessary.
* The caller also ensures that CTX_VALID(mm->context) is false.
*
* We must be careful about boundary cases so that we never
* let the user have CTX 0 (nucleus) or we ever use a CTX
* version of zero (and thus NO_CONTEXT would not be caught
* by version mis-match tests in mmu_context.h).
*
* Always invoked with interrupts disabled.
*/
void get_new_mmu_context(struct mm_struct *mm)
{
unsigned long ctx, new_ctx;
unsigned long orig_pgsz_bits;
unsigned long flags;
int new_version;
spin_lock_irqsave(&ctx_alloc_lock, flags);
orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
new_version = 0;
if (new_ctx >= (1 << CTX_NR_BITS)) {
new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1);
if (new_ctx >= ctx) {
int i;
new_ctx = (tlb_context_cache & CTX_VERSION_MASK) +
CTX_FIRST_VERSION;
if (new_ctx == 1)
new_ctx = CTX_FIRST_VERSION;
/* Don't call memset, for 16 entries that's just
* plain silly...
*/
mmu_context_bmap[0] = 3;
mmu_context_bmap[1] = 0;
mmu_context_bmap[2] = 0;
mmu_context_bmap[3] = 0;
for (i = 4; i < CTX_BMAP_SLOTS; i += 4) {
mmu_context_bmap[i + 0] = 0;
mmu_context_bmap[i + 1] = 0;
mmu_context_bmap[i + 2] = 0;
mmu_context_bmap[i + 3] = 0;
}
new_version = 1;
goto out;
}
}
mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63));
new_ctx |= (tlb_context_cache & CTX_VERSION_MASK);
out:
tlb_context_cache = new_ctx;
mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
spin_unlock_irqrestore(&ctx_alloc_lock, flags);
if (unlikely(new_version))
smp_new_mmu_context_version();
}
void sparc_ultra_dump_itlb(void)
{
int slot;
if (tlb_type == spitfire) {
printk ("Contents of itlb: ");
for (slot = 0; slot < 14; slot++) printk (" ");
printk ("%2x:%016lx,%016lx\n",
0,
spitfire_get_itlb_tag(0), spitfire_get_itlb_data(0));
for (slot = 1; slot < 64; slot+=3) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
spitfire_get_itlb_tag(slot), spitfire_get_itlb_data(slot),
slot+1,
spitfire_get_itlb_tag(slot+1), spitfire_get_itlb_data(slot+1),
slot+2,
spitfire_get_itlb_tag(slot+2), spitfire_get_itlb_data(slot+2));
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
printk ("Contents of itlb0:\n");
for (slot = 0; slot < 16; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_litlb_tag(slot), cheetah_get_litlb_data(slot),
slot+1,
cheetah_get_litlb_tag(slot+1), cheetah_get_litlb_data(slot+1));
}
printk ("Contents of itlb2:\n");
for (slot = 0; slot < 128; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_itlb_tag(slot), cheetah_get_itlb_data(slot),
slot+1,
cheetah_get_itlb_tag(slot+1), cheetah_get_itlb_data(slot+1));
}
}
}
void sparc_ultra_dump_dtlb(void)
{
int slot;
if (tlb_type == spitfire) {
printk ("Contents of dtlb: ");
for (slot = 0; slot < 14; slot++) printk (" ");
printk ("%2x:%016lx,%016lx\n", 0,
spitfire_get_dtlb_tag(0), spitfire_get_dtlb_data(0));
for (slot = 1; slot < 64; slot+=3) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
spitfire_get_dtlb_tag(slot), spitfire_get_dtlb_data(slot),
slot+1,
spitfire_get_dtlb_tag(slot+1), spitfire_get_dtlb_data(slot+1),
slot+2,
spitfire_get_dtlb_tag(slot+2), spitfire_get_dtlb_data(slot+2));
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
printk ("Contents of dtlb0:\n");
for (slot = 0; slot < 16; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_ldtlb_tag(slot), cheetah_get_ldtlb_data(slot),
slot+1,
cheetah_get_ldtlb_tag(slot+1), cheetah_get_ldtlb_data(slot+1));
}
printk ("Contents of dtlb2:\n");
for (slot = 0; slot < 512; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_dtlb_tag(slot, 2), cheetah_get_dtlb_data(slot, 2),
slot+1,
cheetah_get_dtlb_tag(slot+1, 2), cheetah_get_dtlb_data(slot+1, 2));
}
if (tlb_type == cheetah_plus) {
printk ("Contents of dtlb3:\n");
for (slot = 0; slot < 512; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_dtlb_tag(slot, 3), cheetah_get_dtlb_data(slot, 3),
slot+1,
cheetah_get_dtlb_tag(slot+1, 3), cheetah_get_dtlb_data(slot+1, 3));
}
}
}
}
extern unsigned long cmdline_memory_size;
/* Find a free area for the bootmem map, avoiding the kernel image
* and the initial ramdisk.
*/
static unsigned long __init choose_bootmap_pfn(unsigned long start_pfn,
unsigned long end_pfn)
{
unsigned long avoid_start, avoid_end, bootmap_size;
int i;
bootmap_size = ((end_pfn - start_pfn) + 7) / 8;
bootmap_size = ALIGN(bootmap_size, sizeof(long));
avoid_start = avoid_end = 0;
#ifdef CONFIG_BLK_DEV_INITRD
avoid_start = initrd_start;
avoid_end = PAGE_ALIGN(initrd_end);
#endif
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("choose_bootmap_pfn: kern[%lx:%lx] avoid[%lx:%lx]\n",
kern_base, PAGE_ALIGN(kern_base + kern_size),
avoid_start, avoid_end);
#endif
for (i = 0; i < pavail_ents; i++) {
unsigned long start, end;
start = pavail[i].phys_addr;
end = start + pavail[i].reg_size;
while (start < end) {
if (start >= kern_base &&
start < PAGE_ALIGN(kern_base + kern_size)) {
start = PAGE_ALIGN(kern_base + kern_size);
continue;
}
if (start >= avoid_start && start < avoid_end) {
start = avoid_end;
continue;
}
if ((end - start) < bootmap_size)
break;
if (start < kern_base &&
(start + bootmap_size) > kern_base) {
start = PAGE_ALIGN(kern_base + kern_size);
continue;
}
if (start < avoid_start &&
(start + bootmap_size) > avoid_start) {
start = avoid_end;
continue;
}
/* OK, it doesn't overlap anything, use it. */
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("choose_bootmap_pfn: Using %lx [%lx]\n",
start >> PAGE_SHIFT, start);
#endif
return start >> PAGE_SHIFT;
}
}
prom_printf("Cannot find free area for bootmap, aborting.\n");
prom_halt();
}
static unsigned long __init bootmem_init(unsigned long *pages_avail,
unsigned long phys_base)
{
unsigned long bootmap_size, end_pfn;
unsigned long end_of_phys_memory = 0UL;
unsigned long bootmap_pfn, bytes_avail, size;
int i;
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("bootmem_init: Scan pavail, ");
#endif
bytes_avail = 0UL;
for (i = 0; i < pavail_ents; i++) {
end_of_phys_memory = pavail[i].phys_addr +
pavail[i].reg_size;
bytes_avail += pavail[i].reg_size;
if (cmdline_memory_size) {
if (bytes_avail > cmdline_memory_size) {
unsigned long slack = bytes_avail - cmdline_memory_size;
bytes_avail -= slack;
end_of_phys_memory -= slack;
pavail[i].reg_size -= slack;
if ((long)pavail[i].reg_size <= 0L) {
pavail[i].phys_addr = 0xdeadbeefUL;
pavail[i].reg_size = 0UL;
pavail_ents = i;
} else {
pavail[i+1].reg_size = 0Ul;
pavail[i+1].phys_addr = 0xdeadbeefUL;
pavail_ents = i + 1;
}
break;
}
}
}
*pages_avail = bytes_avail >> PAGE_SHIFT;
end_pfn = end_of_phys_memory >> PAGE_SHIFT;
#ifdef CONFIG_BLK_DEV_INITRD
/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
if (sparc_ramdisk_image || sparc_ramdisk_image64) {
unsigned long ramdisk_image = sparc_ramdisk_image ?
sparc_ramdisk_image : sparc_ramdisk_image64;
if (ramdisk_image >= (unsigned long)_end - 2 * PAGE_SIZE)
ramdisk_image -= KERNBASE;
initrd_start = ramdisk_image + phys_base;
initrd_end = initrd_start + sparc_ramdisk_size;
if (initrd_end > end_of_phys_memory) {
printk(KERN_CRIT "initrd extends beyond end of memory "
"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
initrd_end, end_of_phys_memory);
initrd_start = 0;
initrd_end = 0;
}
}
#endif
/* Initialize the boot-time allocator. */
max_pfn = max_low_pfn = end_pfn;
min_low_pfn = (phys_base >> PAGE_SHIFT);
bootmap_pfn = choose_bootmap_pfn(min_low_pfn, end_pfn);
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("init_bootmem(min[%lx], bootmap[%lx], max[%lx])\n",
min_low_pfn, bootmap_pfn, max_low_pfn);
#endif
bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn,
min_low_pfn, end_pfn);
/* Now register the available physical memory with the
* allocator.
*/
for (i = 0; i < pavail_ents; i++) {
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("free_bootmem(pavail:%d): base[%lx] size[%lx]\n",
i, pavail[i].phys_addr, pavail[i].reg_size);
#endif
free_bootmem(pavail[i].phys_addr, pavail[i].reg_size);
}
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
size = initrd_end - initrd_start;
/* Resert the initrd image area. */
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("reserve_bootmem(initrd): base[%llx] size[%lx]\n",
initrd_start, initrd_end);
#endif
reserve_bootmem(initrd_start, size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
initrd_start += PAGE_OFFSET;
initrd_end += PAGE_OFFSET;
}
#endif
/* Reserve the kernel text/data/bss. */
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("reserve_bootmem(kernel): base[%lx] size[%lx]\n", kern_base, kern_size);
#endif
reserve_bootmem(kern_base, kern_size);
*pages_avail -= PAGE_ALIGN(kern_size) >> PAGE_SHIFT;
/* Reserve the bootmem map. We do not account for it
* in pages_avail because we will release that memory
* in free_all_bootmem.
*/
size = bootmap_size;
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("reserve_bootmem(bootmap): base[%lx] size[%lx]\n",
(bootmap_pfn << PAGE_SHIFT), size);
#endif
reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
for (i = 0; i < pavail_ents; i++) {
unsigned long start_pfn, end_pfn;
start_pfn = pavail[i].phys_addr >> PAGE_SHIFT;
end_pfn = (start_pfn + (pavail[i].reg_size >> PAGE_SHIFT));
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("memory_present(0, %lx, %lx)\n",
start_pfn, end_pfn);
#endif
memory_present(0, start_pfn, end_pfn);
}
sparse_init();
return end_pfn;
}
static struct linux_prom64_registers pall[MAX_BANKS] __initdata;
static int pall_ents __initdata;
#ifdef CONFIG_DEBUG_PAGEALLOC
static unsigned long kernel_map_range(unsigned long pstart, unsigned long pend, pgprot_t prot)
{
unsigned long vstart = PAGE_OFFSET + pstart;
unsigned long vend = PAGE_OFFSET + pend;
unsigned long alloc_bytes = 0UL;
if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n",
vstart, vend);
prom_halt();
}
while (vstart < vend) {
unsigned long this_end, paddr = __pa(vstart);
pgd_t *pgd = pgd_offset_k(vstart);
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pud = pud_offset(pgd, vstart);
if (pud_none(*pud)) {
pmd_t *new;
new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
alloc_bytes += PAGE_SIZE;
pud_populate(&init_mm, pud, new);
}
pmd = pmd_offset(pud, vstart);
if (!pmd_present(*pmd)) {
pte_t *new;
new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
alloc_bytes += PAGE_SIZE;
pmd_populate_kernel(&init_mm, pmd, new);
}
pte = pte_offset_kernel(pmd, vstart);
this_end = (vstart + PMD_SIZE) & PMD_MASK;
if (this_end > vend)
this_end = vend;
while (vstart < this_end) {
pte_val(*pte) = (paddr | pgprot_val(prot));
vstart += PAGE_SIZE;
paddr += PAGE_SIZE;
pte++;
}
}
return alloc_bytes;
}
extern unsigned int kvmap_linear_patch[1];
#endif /* CONFIG_DEBUG_PAGEALLOC */
static void __init mark_kpte_bitmap(unsigned long start, unsigned long end)
{
const unsigned long shift_256MB = 28;
const unsigned long mask_256MB = ((1UL << shift_256MB) - 1UL);
const unsigned long size_256MB = (1UL << shift_256MB);
while (start < end) {
long remains;
remains = end - start;
if (remains < size_256MB)
break;
if (start & mask_256MB) {
start = (start + size_256MB) & ~mask_256MB;
continue;
}
while (remains >= size_256MB) {
unsigned long index = start >> shift_256MB;
__set_bit(index, kpte_linear_bitmap);
start += size_256MB;
remains -= size_256MB;
}
}
}
static void __init kernel_physical_mapping_init(void)
{
unsigned long i;
#ifdef CONFIG_DEBUG_PAGEALLOC
unsigned long mem_alloced = 0UL;
#endif
read_obp_memory("reg", &pall[0], &pall_ents);
for (i = 0; i < pall_ents; i++) {
unsigned long phys_start, phys_end;
phys_start = pall[i].phys_addr;
phys_end = phys_start + pall[i].reg_size;
mark_kpte_bitmap(phys_start, phys_end);
#ifdef CONFIG_DEBUG_PAGEALLOC
mem_alloced += kernel_map_range(phys_start, phys_end,
PAGE_KERNEL);
#endif
}
#ifdef CONFIG_DEBUG_PAGEALLOC
printk("Allocated %ld bytes for kernel page tables.\n",
mem_alloced);
kvmap_linear_patch[0] = 0x01000000; /* nop */
flushi(&kvmap_linear_patch[0]);
__flush_tlb_all();
#endif
}
#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
kernel_map_range(phys_start, phys_end,
(enable ? PAGE_KERNEL : __pgprot(0)));
flush_tsb_kernel_range(PAGE_OFFSET + phys_start,
PAGE_OFFSET + phys_end);
/* we should perform an IPI and flush all tlbs,
* but that can deadlock->flush only current cpu.
*/
__flush_tlb_kernel_range(PAGE_OFFSET + phys_start,
PAGE_OFFSET + phys_end);
}
#endif
unsigned long __init find_ecache_flush_span(unsigned long size)
{
int i;
for (i = 0; i < pavail_ents; i++) {
if (pavail[i].reg_size >= size)
return pavail[i].phys_addr;
}
return ~0UL;
}
static void __init tsb_phys_patch(void)
{
struct tsb_ldquad_phys_patch_entry *pquad;
struct tsb_phys_patch_entry *p;
pquad = &__tsb_ldquad_phys_patch;
while (pquad < &__tsb_ldquad_phys_patch_end) {
unsigned long addr = pquad->addr;
if (tlb_type == hypervisor)
*(unsigned int *) addr = pquad->sun4v_insn;
else
*(unsigned int *) addr = pquad->sun4u_insn;
wmb();
__asm__ __volatile__("flush %0"
: /* no outputs */
: "r" (addr));
pquad++;
}
p = &__tsb_phys_patch;
while (p < &__tsb_phys_patch_end) {
unsigned long addr = p->addr;
*(unsigned int *) addr = p->insn;
wmb();
__asm__ __volatile__("flush %0"
: /* no outputs */
: "r" (addr));
p++;
}
}
/* Don't mark as init, we give this to the Hypervisor. */
static struct hv_tsb_descr ktsb_descr[2];
extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
static void __init sun4v_ktsb_init(void)
{
unsigned long ktsb_pa;
/* First KTSB for PAGE_SIZE mappings. */
ktsb_pa = kern_base + ((unsigned long)&swapper_tsb[0] - KERNBASE);
switch (PAGE_SIZE) {
case 8 * 1024:
default:
ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_8K;
ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_8K;
break;
case 64 * 1024:
ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_64K;
ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_64K;
break;
case 512 * 1024:
ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_512K;
ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_512K;
break;
case 4 * 1024 * 1024:
ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_4MB;
ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_4MB;
break;
};
ktsb_descr[0].assoc = 1;
ktsb_descr[0].num_ttes = KERNEL_TSB_NENTRIES;
ktsb_descr[0].ctx_idx = 0;
ktsb_descr[0].tsb_base = ktsb_pa;
ktsb_descr[0].resv = 0;
/* Second KTSB for 4MB/256MB mappings. */
ktsb_pa = (kern_base +
((unsigned long)&swapper_4m_tsb[0] - KERNBASE));
ktsb_descr[1].pgsz_idx = HV_PGSZ_IDX_4MB;
ktsb_descr[1].pgsz_mask = (HV_PGSZ_MASK_4MB |
HV_PGSZ_MASK_256MB);
ktsb_descr[1].assoc = 1;
ktsb_descr[1].num_ttes = KERNEL_TSB4M_NENTRIES;
ktsb_descr[1].ctx_idx = 0;
ktsb_descr[1].tsb_base = ktsb_pa;
ktsb_descr[1].resv = 0;
}
void __cpuinit sun4v_ktsb_register(void)
{
register unsigned long func asm("%o5");
register unsigned long arg0 asm("%o0");
register unsigned long arg1 asm("%o1");
unsigned long pa;
pa = kern_base + ((unsigned long)&ktsb_descr[0] - KERNBASE);
func = HV_FAST_MMU_TSB_CTX0;
arg0 = 2;
arg1 = pa;
__asm__ __volatile__("ta %6"
: "=&r" (func), "=&r" (arg0), "=&r" (arg1)
: "0" (func), "1" (arg0), "2" (arg1),
"i" (HV_FAST_TRAP));
}
/* paging_init() sets up the page tables */
extern void cheetah_ecache_flush_init(void);
extern void sun4v_patch_tlb_handlers(void);
static unsigned long last_valid_pfn;
pgd_t swapper_pg_dir[2048];
static void sun4u_pgprot_init(void);
static void sun4v_pgprot_init(void);
void __init paging_init(void)
{
unsigned long end_pfn, pages_avail, shift, phys_base;
unsigned long real_end, i;
kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
/* Invalidate both kernel TSBs. */
memset(swapper_tsb, 0x40, sizeof(swapper_tsb));
memset(swapper_4m_tsb, 0x40, sizeof(swapper_4m_tsb));
if (tlb_type == hypervisor)
sun4v_pgprot_init();
else
sun4u_pgprot_init();
if (tlb_type == cheetah_plus ||
tlb_type == hypervisor)
tsb_phys_patch();
if (tlb_type == hypervisor) {
sun4v_patch_tlb_handlers();
sun4v_ktsb_init();
}
/* Find available physical memory... */
read_obp_memory("available", &pavail[0], &pavail_ents);
phys_base = 0xffffffffffffffffUL;
for (i = 0; i < pavail_ents; i++)
phys_base = min(phys_base, pavail[i].phys_addr);
set_bit(0, mmu_context_bmap);
shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);
real_end = (unsigned long)_end;
if ((real_end > ((unsigned long)KERNBASE + 0x400000)))
bigkernel = 1;
if ((real_end > ((unsigned long)KERNBASE + 0x800000))) {
prom_printf("paging_init: Kernel > 8MB, too large.\n");
prom_halt();
}
/* Set kernel pgd to upper alias so physical page computations
* work.
*/
init_mm.pgd += ((shift) / (sizeof(pgd_t)));
memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir));
/* Now can init the kernel/bad page tables. */
pud_set(pud_offset(&swapper_pg_dir[0], 0),
swapper_low_pmd_dir + (shift / sizeof(pgd_t)));
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
inherit_prom_mappings();
/* Ok, we can use our TLB miss and window trap handlers safely. */
setup_tba();
[SPARC64]: Fix boot failures on SunBlade-150 The sequence to move over to the Linux trap tables from the firmware ones needs to be more air tight. It turns out that to be %100 safe we do need to be able to translate OBP mappings in our TLB miss handlers early. In order not to eat up a lot of kernel image memory with static page tables, just use the translations array in the OBP TLB miss handlers. That solves the bulk of the problem. Furthermore, to make sure the OBP TLB miss path will work even before the fixed MMU globals are loaded, explicitly load %g1 to TLB_SFSR at the beginning of the i-TLB and d-TLB miss handlers. To ease the OBP TLB miss walking of the prom_trans[] array, we sort it then delete all of the non-OBP entries in there (for example, there are entries for the kernel image itself which we're not interested in at all). We also save about 32K of kernel image size with this change. Not a bad side effect :-) There are still some reasons why trampoline.S can't use the setup_trap_table() yet. The most noteworthy are: 1) OBP boots secondary processors with non-bias'd stack for some reason. This is easily fixed by using a small bootup stack in the kernel image explicitly for this purpose. 2) Doing a firmware call via the normal C call prom_set_trap_table() goes through the whole OBP enter/exit sequence that saves and restores OBP and Linux kernel state in the MMUs. This path unfortunately does a "flush %g6" while loading up the OBP locked TLB entries for the firmware call. If we setup the %g6 in the trampoline.S code properly, that is in the PAGE_OFFSET linear mapping, but we're not on the kernel trap table yet so those addresses won't translate properly. One idea is to do a by-hand firmware call like we do in the early bootup code and elsewhere here in trampoline.S But this fails as well, as aparently the secondary processors are not booted with OBP's special locked TLB entries loaded. These are necessary for the firwmare to processes TLB misses correctly up until the point where we take over the trap table. This does need to be resolved at some point. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 19:22:46 +00:00
__flush_tlb_all();
if (tlb_type == hypervisor)
sun4v_ktsb_register();
/* Setup bootmem... */
pages_avail = 0;
last_valid_pfn = end_pfn = bootmem_init(&pages_avail, phys_base);
max_mapnr = last_valid_pfn;
kernel_physical_mapping_init();
prom_build_devicetree();
{
unsigned long zones_size[MAX_NR_ZONES];
unsigned long zholes_size[MAX_NR_ZONES];
int znum;
for (znum = 0; znum < MAX_NR_ZONES; znum++)
zones_size[znum] = zholes_size[znum] = 0;
zones_size[ZONE_DMA] = end_pfn;
zholes_size[ZONE_DMA] = end_pfn - pages_avail;
free_area_init_node(0, &contig_page_data, zones_size,
__pa(PAGE_OFFSET) >> PAGE_SHIFT,
zholes_size);
}
device_scan();
}
static void __init taint_real_pages(void)
{
int i;
read_obp_memory("available", &pavail_rescan[0], &pavail_rescan_ents);
/* Find changes discovered in the physmem available rescan and
* reserve the lost portions in the bootmem maps.
*/
for (i = 0; i < pavail_ents; i++) {
unsigned long old_start, old_end;
old_start = pavail[i].phys_addr;
old_end = old_start +
pavail[i].reg_size;
while (old_start < old_end) {
int n;
for (n = 0; n < pavail_rescan_ents; n++) {
unsigned long new_start, new_end;
new_start = pavail_rescan[n].phys_addr;
new_end = new_start +
pavail_rescan[n].reg_size;
if (new_start <= old_start &&
new_end >= (old_start + PAGE_SIZE)) {
set_bit(old_start >> 22,
sparc64_valid_addr_bitmap);
goto do_next_page;
}
}
reserve_bootmem(old_start, PAGE_SIZE);
do_next_page:
old_start += PAGE_SIZE;
}
}
}
int __init page_in_phys_avail(unsigned long paddr)
{
int i;
paddr &= PAGE_MASK;
for (i = 0; i < pavail_rescan_ents; i++) {
unsigned long start, end;
start = pavail_rescan[i].phys_addr;
end = start + pavail_rescan[i].reg_size;
if (paddr >= start && paddr < end)
return 1;
}
if (paddr >= kern_base && paddr < (kern_base + kern_size))
return 1;
#ifdef CONFIG_BLK_DEV_INITRD
if (paddr >= __pa(initrd_start) &&
paddr < __pa(PAGE_ALIGN(initrd_end)))
return 1;
#endif
return 0;
}
void __init mem_init(void)
{
unsigned long codepages, datapages, initpages;
unsigned long addr, last;
int i;
i = last_valid_pfn >> ((22 - PAGE_SHIFT) + 6);
i += 1;
sparc64_valid_addr_bitmap = (unsigned long *) alloc_bootmem(i << 3);
if (sparc64_valid_addr_bitmap == NULL) {
prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
prom_halt();
}
memset(sparc64_valid_addr_bitmap, 0, i << 3);
addr = PAGE_OFFSET + kern_base;
last = PAGE_ALIGN(kern_size) + addr;
while (addr < last) {
set_bit(__pa(addr) >> 22, sparc64_valid_addr_bitmap);
addr += PAGE_SIZE;
}
taint_real_pages();
high_memory = __va(last_valid_pfn << PAGE_SHIFT);
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("mem_init: Calling free_all_bootmem().\n");
#endif
totalram_pages = num_physpages = free_all_bootmem() - 1;
/*
* Set up the zero page, mark it reserved, so that page count
* is not manipulated when freeing the page from user ptes.
*/
mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0);
if (mem_map_zero == NULL) {
prom_printf("paging_init: Cannot alloc zero page.\n");
prom_halt();
}
SetPageReserved(mem_map_zero);
codepages = (((unsigned long) _etext) - ((unsigned long) _start));
codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
datapages = (((unsigned long) _edata) - ((unsigned long) _etext));
datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
initpages = (((unsigned long) __init_end) - ((unsigned long) __init_begin));
initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
printk("Memory: %uk available (%ldk kernel code, %ldk data, %ldk init) [%016lx,%016lx]\n",
nr_free_pages() << (PAGE_SHIFT-10),
codepages << (PAGE_SHIFT-10),
datapages << (PAGE_SHIFT-10),
initpages << (PAGE_SHIFT-10),
PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT));
if (tlb_type == cheetah || tlb_type == cheetah_plus)
cheetah_ecache_flush_init();
}
void free_initmem(void)
{
unsigned long addr, initend;
/*
* The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
*/
addr = PAGE_ALIGN((unsigned long)(__init_begin));
initend = (unsigned long)(__init_end) & PAGE_MASK;
for (; addr < initend; addr += PAGE_SIZE) {
unsigned long page;
struct page *p;
page = (addr +
((unsigned long) __va(kern_base)) -
((unsigned long) KERNBASE));
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
p = virt_to_page(page);
ClearPageReserved(p);
init_page_count(p);
__free_page(p);
num_physpages++;
totalram_pages++;
}
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
if (start < end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
struct page *p = virt_to_page(start);
ClearPageReserved(p);
init_page_count(p);
__free_page(p);
num_physpages++;
totalram_pages++;
}
}
#endif
#define _PAGE_CACHE_4U (_PAGE_CP_4U | _PAGE_CV_4U)
#define _PAGE_CACHE_4V (_PAGE_CP_4V | _PAGE_CV_4V)
#define __DIRTY_BITS_4U (_PAGE_MODIFIED_4U | _PAGE_WRITE_4U | _PAGE_W_4U)
#define __DIRTY_BITS_4V (_PAGE_MODIFIED_4V | _PAGE_WRITE_4V | _PAGE_W_4V)
#define __ACCESS_BITS_4U (_PAGE_ACCESSED_4U | _PAGE_READ_4U | _PAGE_R)
#define __ACCESS_BITS_4V (_PAGE_ACCESSED_4V | _PAGE_READ_4V | _PAGE_R)
pgprot_t PAGE_KERNEL __read_mostly;
EXPORT_SYMBOL(PAGE_KERNEL);
pgprot_t PAGE_KERNEL_LOCKED __read_mostly;
pgprot_t PAGE_COPY __read_mostly;
pgprot_t PAGE_SHARED __read_mostly;
EXPORT_SYMBOL(PAGE_SHARED);
pgprot_t PAGE_EXEC __read_mostly;
unsigned long pg_iobits __read_mostly;
unsigned long _PAGE_IE __read_mostly;
EXPORT_SYMBOL(_PAGE_IE);
unsigned long _PAGE_E __read_mostly;
EXPORT_SYMBOL(_PAGE_E);
unsigned long _PAGE_CACHE __read_mostly;
EXPORT_SYMBOL(_PAGE_CACHE);
static void prot_init_common(unsigned long page_none,
unsigned long page_shared,
unsigned long page_copy,
unsigned long page_readonly,
unsigned long page_exec_bit)
{
PAGE_COPY = __pgprot(page_copy);
PAGE_SHARED = __pgprot(page_shared);
protection_map[0x0] = __pgprot(page_none);
protection_map[0x1] = __pgprot(page_readonly & ~page_exec_bit);
protection_map[0x2] = __pgprot(page_copy & ~page_exec_bit);
protection_map[0x3] = __pgprot(page_copy & ~page_exec_bit);
protection_map[0x4] = __pgprot(page_readonly);
protection_map[0x5] = __pgprot(page_readonly);
protection_map[0x6] = __pgprot(page_copy);
protection_map[0x7] = __pgprot(page_copy);
protection_map[0x8] = __pgprot(page_none);
protection_map[0x9] = __pgprot(page_readonly & ~page_exec_bit);
protection_map[0xa] = __pgprot(page_shared & ~page_exec_bit);
protection_map[0xb] = __pgprot(page_shared & ~page_exec_bit);
protection_map[0xc] = __pgprot(page_readonly);
protection_map[0xd] = __pgprot(page_readonly);
protection_map[0xe] = __pgprot(page_shared);
protection_map[0xf] = __pgprot(page_shared);
}
static void __init sun4u_pgprot_init(void)
{
unsigned long page_none, page_shared, page_copy, page_readonly;
unsigned long page_exec_bit;
PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
_PAGE_CACHE_4U | _PAGE_P_4U |
__ACCESS_BITS_4U | __DIRTY_BITS_4U |
_PAGE_EXEC_4U);
PAGE_KERNEL_LOCKED = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
_PAGE_CACHE_4U | _PAGE_P_4U |
__ACCESS_BITS_4U | __DIRTY_BITS_4U |
_PAGE_EXEC_4U | _PAGE_L_4U);
PAGE_EXEC = __pgprot(_PAGE_EXEC_4U);
_PAGE_IE = _PAGE_IE_4U;
_PAGE_E = _PAGE_E_4U;
_PAGE_CACHE = _PAGE_CACHE_4U;
pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4U | __DIRTY_BITS_4U |
__ACCESS_BITS_4U | _PAGE_E_4U);
kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4U) ^
0xfffff80000000000;
kern_linear_pte_xor[0] |= (_PAGE_CP_4U | _PAGE_CV_4U |
_PAGE_P_4U | _PAGE_W_4U);
/* XXX Should use 256MB on Panther. XXX */
kern_linear_pte_xor[1] = kern_linear_pte_xor[0];
_PAGE_SZBITS = _PAGE_SZBITS_4U;
_PAGE_ALL_SZ_BITS = (_PAGE_SZ4MB_4U | _PAGE_SZ512K_4U |
_PAGE_SZ64K_4U | _PAGE_SZ8K_4U |
_PAGE_SZ32MB_4U | _PAGE_SZ256MB_4U);
page_none = _PAGE_PRESENT_4U | _PAGE_ACCESSED_4U | _PAGE_CACHE_4U;
page_shared = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
__ACCESS_BITS_4U | _PAGE_WRITE_4U | _PAGE_EXEC_4U);
page_copy = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
__ACCESS_BITS_4U | _PAGE_EXEC_4U);
page_readonly = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
__ACCESS_BITS_4U | _PAGE_EXEC_4U);
page_exec_bit = _PAGE_EXEC_4U;
prot_init_common(page_none, page_shared, page_copy, page_readonly,
page_exec_bit);
}
static void __init sun4v_pgprot_init(void)
{
unsigned long page_none, page_shared, page_copy, page_readonly;
unsigned long page_exec_bit;
PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4V | _PAGE_VALID |
_PAGE_CACHE_4V | _PAGE_P_4V |
__ACCESS_BITS_4V | __DIRTY_BITS_4V |
_PAGE_EXEC_4V);
PAGE_KERNEL_LOCKED = PAGE_KERNEL;
PAGE_EXEC = __pgprot(_PAGE_EXEC_4V);
_PAGE_IE = _PAGE_IE_4V;
_PAGE_E = _PAGE_E_4V;
_PAGE_CACHE = _PAGE_CACHE_4V;
kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4V) ^
0xfffff80000000000;
kern_linear_pte_xor[0] |= (_PAGE_CP_4V | _PAGE_CV_4V |
_PAGE_P_4V | _PAGE_W_4V);
kern_linear_pte_xor[1] = (_PAGE_VALID | _PAGE_SZ256MB_4V) ^
0xfffff80000000000;
kern_linear_pte_xor[1] |= (_PAGE_CP_4V | _PAGE_CV_4V |
_PAGE_P_4V | _PAGE_W_4V);
pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4V | __DIRTY_BITS_4V |
__ACCESS_BITS_4V | _PAGE_E_4V);
_PAGE_SZBITS = _PAGE_SZBITS_4V;
_PAGE_ALL_SZ_BITS = (_PAGE_SZ16GB_4V | _PAGE_SZ2GB_4V |
_PAGE_SZ256MB_4V | _PAGE_SZ32MB_4V |
_PAGE_SZ4MB_4V | _PAGE_SZ512K_4V |
_PAGE_SZ64K_4V | _PAGE_SZ8K_4V);
page_none = _PAGE_PRESENT_4V | _PAGE_ACCESSED_4V | _PAGE_CACHE_4V;
page_shared = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
__ACCESS_BITS_4V | _PAGE_WRITE_4V | _PAGE_EXEC_4V);
page_copy = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
__ACCESS_BITS_4V | _PAGE_EXEC_4V);
page_readonly = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
__ACCESS_BITS_4V | _PAGE_EXEC_4V);
page_exec_bit = _PAGE_EXEC_4V;
prot_init_common(page_none, page_shared, page_copy, page_readonly,
page_exec_bit);
}
unsigned long pte_sz_bits(unsigned long sz)
{
if (tlb_type == hypervisor) {
switch (sz) {
case 8 * 1024:
default:
return _PAGE_SZ8K_4V;
case 64 * 1024:
return _PAGE_SZ64K_4V;
case 512 * 1024:
return _PAGE_SZ512K_4V;
case 4 * 1024 * 1024:
return _PAGE_SZ4MB_4V;
};
} else {
switch (sz) {
case 8 * 1024:
default:
return _PAGE_SZ8K_4U;
case 64 * 1024:
return _PAGE_SZ64K_4U;
case 512 * 1024:
return _PAGE_SZ512K_4U;
case 4 * 1024 * 1024:
return _PAGE_SZ4MB_4U;
};
}
}
pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space, unsigned long page_size)
{
pte_t pte;
pte_val(pte) = page | pgprot_val(pgprot_noncached(prot));
pte_val(pte) |= (((unsigned long)space) << 32);
pte_val(pte) |= pte_sz_bits(page_size);
return pte;
}
static unsigned long kern_large_tte(unsigned long paddr)
{
unsigned long val;
val = (_PAGE_VALID | _PAGE_SZ4MB_4U |
_PAGE_CP_4U | _PAGE_CV_4U | _PAGE_P_4U |
_PAGE_EXEC_4U | _PAGE_L_4U | _PAGE_W_4U);
if (tlb_type == hypervisor)
val = (_PAGE_VALID | _PAGE_SZ4MB_4V |
_PAGE_CP_4V | _PAGE_CV_4V | _PAGE_P_4V |
_PAGE_EXEC_4V | _PAGE_W_4V);
return val | paddr;
}
/*
* Translate PROM's mapping we capture at boot time into physical address.
* The second parameter is only set from prom_callback() invocations.
*/
unsigned long prom_virt_to_phys(unsigned long promva, int *error)
{
unsigned long mask;
int i;
mask = _PAGE_PADDR_4U;
if (tlb_type == hypervisor)
mask = _PAGE_PADDR_4V;
for (i = 0; i < prom_trans_ents; i++) {
struct linux_prom_translation *p = &prom_trans[i];
if (promva >= p->virt &&
promva < (p->virt + p->size)) {
unsigned long base = p->data & mask;
if (error)
*error = 0;
return base + (promva & (8192 - 1));
}
}
if (error)
*error = 1;
return 0UL;
}
/* XXX We should kill off this ugly thing at so me point. XXX */
unsigned long sun4u_get_pte(unsigned long addr)
{
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
unsigned long mask = _PAGE_PADDR_4U;
if (tlb_type == hypervisor)
mask = _PAGE_PADDR_4V;
if (addr >= PAGE_OFFSET)
return addr & mask;
if ((addr >= LOW_OBP_ADDRESS) && (addr < HI_OBP_ADDRESS))
return prom_virt_to_phys(addr, NULL);
pgdp = pgd_offset_k(addr);
pudp = pud_offset(pgdp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset_kernel(pmdp, addr);
return pte_val(*ptep) & mask;
}
/* If not locked, zap it. */
void __flush_tlb_all(void)
{
unsigned long pstate;
int i;
__asm__ __volatile__("flushw\n\t"
"rdpr %%pstate, %0\n\t"
"wrpr %0, %1, %%pstate"
: "=r" (pstate)
: "i" (PSTATE_IE));
if (tlb_type == spitfire) {
for (i = 0; i < 64; i++) {
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
if (!(spitfire_get_dtlb_data(i) & _PAGE_L_4U)) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
spitfire_put_dtlb_data(i, 0x0UL);
}
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
if (!(spitfire_get_itlb_data(i) & _PAGE_L_4U)) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
spitfire_put_itlb_data(i, 0x0UL);
}
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
cheetah_flush_dtlb_all();
cheetah_flush_itlb_all();
}
__asm__ __volatile__("wrpr %0, 0, %%pstate"
: : "r" (pstate));
}
#ifdef CONFIG_MEMORY_HOTPLUG
void online_page(struct page *page)
{
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;
}
int remove_memory(u64 start, u64 size)
{
return -EINVAL;
}
#endif /* CONFIG_MEMORY_HOTPLUG */