b58e5d050f
Commit f06a96844a broke MIPS.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
336 lines
8.3 KiB
C
336 lines
8.3 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/pfn.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/cachectl.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlb.h>
|
|
|
|
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
|
|
unsigned long highstart_pfn, highend_pfn;
|
|
|
|
/*
|
|
* We have up to 8 empty zeroed pages so we can map one of the right colour
|
|
* when needed. This is necessary only on R4000 / R4400 SC and MC versions
|
|
* where we have to avoid VCED / VECI exceptions for good performance at
|
|
* any price. Since page is never written to after the initialization we
|
|
* don't have to care about aliases on other CPUs.
|
|
*/
|
|
unsigned long empty_zero_page, zero_page_mask;
|
|
|
|
/*
|
|
* Not static inline because used by IP27 special magic initialization code
|
|
*/
|
|
unsigned long setup_zero_pages(void)
|
|
{
|
|
unsigned int order;
|
|
unsigned long size;
|
|
struct page *page;
|
|
|
|
if (cpu_has_vce)
|
|
order = 3;
|
|
else
|
|
order = 0;
|
|
|
|
empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
|
|
if (!empty_zero_page)
|
|
panic("Oh boy, that early out of memory?");
|
|
|
|
page = virt_to_page(empty_zero_page);
|
|
split_page(page, order);
|
|
while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
|
|
SetPageReserved(page);
|
|
page++;
|
|
}
|
|
|
|
size = PAGE_SIZE << order;
|
|
zero_page_mask = (size - 1) & PAGE_MASK;
|
|
|
|
return 1UL << order;
|
|
}
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
pte_t *kmap_pte;
|
|
pgprot_t kmap_prot;
|
|
|
|
#define kmap_get_fixmap_pte(vaddr) \
|
|
pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
|
|
|
|
static void __init kmap_init(void)
|
|
{
|
|
unsigned long kmap_vstart;
|
|
|
|
/* cache the first kmap pte */
|
|
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
|
|
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
|
|
|
|
kmap_prot = PAGE_KERNEL;
|
|
}
|
|
|
|
#ifdef CONFIG_32BIT
|
|
void __init fixrange_init(unsigned long start, unsigned long end,
|
|
pgd_t *pgd_base)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
int i, j, k;
|
|
unsigned long vaddr;
|
|
|
|
vaddr = start;
|
|
i = __pgd_offset(vaddr);
|
|
j = __pud_offset(vaddr);
|
|
k = __pmd_offset(vaddr);
|
|
pgd = pgd_base + i;
|
|
|
|
for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
|
|
pud = (pud_t *)pgd;
|
|
for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
|
|
pmd = (pmd_t *)pud;
|
|
for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
|
|
if (pmd_none(*pmd)) {
|
|
pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
|
|
set_pmd(pmd, __pmd(pte));
|
|
if (pte != pte_offset_kernel(pmd, 0))
|
|
BUG();
|
|
}
|
|
vaddr += PMD_SIZE;
|
|
}
|
|
k = 0;
|
|
}
|
|
j = 0;
|
|
}
|
|
}
|
|
#endif /* CONFIG_32BIT */
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
#ifndef CONFIG_NEED_MULTIPLE_NODES
|
|
extern void pagetable_init(void);
|
|
|
|
static int __init page_is_ram(unsigned long pagenr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
|
unsigned long addr, end;
|
|
|
|
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
|
|
/* not usable memory */
|
|
continue;
|
|
|
|
addr = PFN_UP(boot_mem_map.map[i].addr);
|
|
end = PFN_DOWN(boot_mem_map.map[i].addr +
|
|
boot_mem_map.map[i].size);
|
|
|
|
if (pagenr >= addr && pagenr < end)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __init paging_init(void)
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
|
|
unsigned long max_dma, high, low;
|
|
#ifndef CONFIG_FLATMEM
|
|
unsigned long zholes_size[MAX_NR_ZONES] = { 0, };
|
|
unsigned long i, j, pfn;
|
|
#endif
|
|
|
|
pagetable_init();
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
kmap_init();
|
|
#endif
|
|
|
|
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
|
|
low = max_low_pfn;
|
|
high = highend_pfn;
|
|
|
|
#ifdef CONFIG_ISA
|
|
if (low < max_dma)
|
|
zones_size[ZONE_DMA] = low;
|
|
else {
|
|
zones_size[ZONE_DMA] = max_dma;
|
|
zones_size[ZONE_NORMAL] = low - max_dma;
|
|
}
|
|
#else
|
|
zones_size[ZONE_DMA] = low;
|
|
#endif
|
|
#ifdef CONFIG_HIGHMEM
|
|
if (cpu_has_dc_aliases) {
|
|
printk(KERN_WARNING "This processor doesn't support highmem.");
|
|
if (high - low)
|
|
printk(" %ldk highmem ignored", high - low);
|
|
printk("\n");
|
|
} else
|
|
zones_size[ZONE_HIGHMEM] = high - low;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
free_area_init(zones_size);
|
|
#else
|
|
pfn = 0;
|
|
for (i = 0; i < MAX_NR_ZONES; i++)
|
|
for (j = 0; j < zones_size[i]; j++, pfn++)
|
|
if (!page_is_ram(pfn))
|
|
zholes_size[i]++;
|
|
free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
|
|
#endif
|
|
}
|
|
|
|
static struct kcore_list kcore_mem, kcore_vmalloc;
|
|
#ifdef CONFIG_64BIT
|
|
static struct kcore_list kcore_kseg0;
|
|
#endif
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
unsigned long codesize, reservedpages, datasize, initsize;
|
|
unsigned long tmp, ram;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
#ifdef CONFIG_DISCONTIGMEM
|
|
#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
|
|
#endif
|
|
max_mapnr = highend_pfn;
|
|
#else
|
|
max_mapnr = max_low_pfn;
|
|
#endif
|
|
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
|
|
|
|
totalram_pages += free_all_bootmem();
|
|
totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
|
|
|
|
reservedpages = ram = 0;
|
|
for (tmp = 0; tmp < max_low_pfn; tmp++)
|
|
if (page_is_ram(tmp)) {
|
|
ram++;
|
|
if (PageReserved(pfn_to_page(tmp)))
|
|
reservedpages++;
|
|
}
|
|
num_physpages = ram;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
|
|
struct page *page = mem_map + tmp;
|
|
|
|
if (!page_is_ram(tmp)) {
|
|
SetPageReserved(page);
|
|
continue;
|
|
}
|
|
ClearPageReserved(page);
|
|
#ifdef CONFIG_LIMITED_DMA
|
|
set_page_address(page, lowmem_page_address(page));
|
|
#endif
|
|
init_page_count(page);
|
|
__free_page(page);
|
|
totalhigh_pages++;
|
|
}
|
|
totalram_pages += totalhigh_pages;
|
|
num_physpages += totalhigh_pages;
|
|
#endif
|
|
|
|
codesize = (unsigned long) &_etext - (unsigned long) &_text;
|
|
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
|
|
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
|
|
|
|
#ifdef CONFIG_64BIT
|
|
if ((unsigned long) &_text > (unsigned long) CKSEG0)
|
|
/* The -4 is a hack so that user tools don't have to handle
|
|
the overflow. */
|
|
kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
|
|
#endif
|
|
kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
|
|
kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
|
|
VMALLOC_END-VMALLOC_START);
|
|
|
|
printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
|
|
"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
|
|
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
|
|
ram << (PAGE_SHIFT-10),
|
|
codesize >> 10,
|
|
reservedpages << (PAGE_SHIFT-10),
|
|
datasize >> 10,
|
|
initsize >> 10,
|
|
(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
|
|
}
|
|
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
void free_init_pages(char *what, unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
for (addr = begin; addr < end; addr += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
memset((void *)addr, 0xcc, PAGE_SIZE);
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
#ifdef CONFIG_64BIT
|
|
/* Switch from KSEG0 to XKPHYS addresses */
|
|
start = (unsigned long)phys_to_virt(CPHYSADDR(start));
|
|
end = (unsigned long)phys_to_virt(CPHYSADDR(end));
|
|
#endif
|
|
free_init_pages("initrd memory", start, end);
|
|
}
|
|
#endif
|
|
|
|
extern unsigned long prom_free_prom_memory(void);
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long start, end, freed;
|
|
|
|
freed = prom_free_prom_memory();
|
|
if (freed)
|
|
printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);
|
|
|
|
start = (unsigned long)(&__init_begin);
|
|
end = (unsigned long)(&__init_end);
|
|
#ifdef CONFIG_64BIT
|
|
start = PAGE_OFFSET | CPHYSADDR(start);
|
|
end = PAGE_OFFSET | CPHYSADDR(end);
|
|
#endif
|
|
free_init_pages("unused kernel memory", start, end);
|
|
}
|