![Peter Chubb](/assets/img/avatar_default.png)
I've solved the problem I was having with the simulator and not
booting Debian.
The problem is that the number of bits for the virtual linear array
short-format VHPT (Virtually mapped linear page table, VMLPT for
short) is being tested incorrectly.
There are two problems:
1. The PAL call that should tell the kernel the size of the
virtual address space isn't implemented for the simulator, so
the kernel uses the default 50. This is addressed separately
in dc90e95f31
2. In arch/ia64/mm/init.c there's code to calcualte the size
of the VMLPT based on the number of implemented virtual address
bits and the page size. It checks to see if the VMLPT base
address overlaps the top of the mapped region, but this check
doesn't allow for the address space hole, and in fact will
never trigger.
Here's an alternative test and panic, that I think is more accurate.
Signed-off-by: Peter Chubb <peterc@gelato.unsw.edu.au>
Signed-off-by: Tony Luck <tony.luck@intel.com>
642 lines
17 KiB
C
642 lines
17 KiB
C
/*
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* Initialize MMU support.
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*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/efi.h>
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#include <linux/elf.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/proc_fs.h>
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#include <linux/bitops.h>
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#include <asm/a.out.h>
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#include <asm/dma.h>
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#include <asm/ia32.h>
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#include <asm/io.h>
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#include <asm/machvec.h>
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#include <asm/numa.h>
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#include <asm/patch.h>
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#include <asm/pgalloc.h>
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#include <asm/sal.h>
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#include <asm/sections.h>
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#include <asm/system.h>
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#include <asm/tlb.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/mca.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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DEFINE_PER_CPU(unsigned long *, __pgtable_quicklist);
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DEFINE_PER_CPU(long, __pgtable_quicklist_size);
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extern void ia64_tlb_init (void);
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unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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unsigned long vmalloc_end = VMALLOC_END_INIT;
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EXPORT_SYMBOL(vmalloc_end);
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struct page *vmem_map;
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EXPORT_SYMBOL(vmem_map);
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#endif
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struct page *zero_page_memmap_ptr; /* map entry for zero page */
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EXPORT_SYMBOL(zero_page_memmap_ptr);
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#define MIN_PGT_PAGES 25UL
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#define MAX_PGT_FREES_PER_PASS 16L
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#define PGT_FRACTION_OF_NODE_MEM 16
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static inline long
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max_pgt_pages(void)
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{
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u64 node_free_pages, max_pgt_pages;
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#ifndef CONFIG_NUMA
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node_free_pages = nr_free_pages();
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#else
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node_free_pages = nr_free_pages_pgdat(NODE_DATA(numa_node_id()));
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#endif
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max_pgt_pages = node_free_pages / PGT_FRACTION_OF_NODE_MEM;
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max_pgt_pages = max(max_pgt_pages, MIN_PGT_PAGES);
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return max_pgt_pages;
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}
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static inline long
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min_pages_to_free(void)
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{
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long pages_to_free;
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pages_to_free = pgtable_quicklist_size - max_pgt_pages();
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pages_to_free = min(pages_to_free, MAX_PGT_FREES_PER_PASS);
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return pages_to_free;
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}
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void
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check_pgt_cache(void)
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{
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long pages_to_free;
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if (unlikely(pgtable_quicklist_size <= MIN_PGT_PAGES))
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return;
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preempt_disable();
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while (unlikely((pages_to_free = min_pages_to_free()) > 0)) {
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while (pages_to_free--) {
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free_page((unsigned long)pgtable_quicklist_alloc());
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}
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preempt_enable();
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preempt_disable();
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}
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preempt_enable();
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}
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void
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lazy_mmu_prot_update (pte_t pte)
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{
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unsigned long addr;
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struct page *page;
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if (!pte_exec(pte))
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return; /* not an executable page... */
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page = pte_page(pte);
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addr = (unsigned long) page_address(page);
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if (test_bit(PG_arch_1, &page->flags))
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return; /* i-cache is already coherent with d-cache */
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flush_icache_range(addr, addr + PAGE_SIZE);
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set_bit(PG_arch_1, &page->flags); /* mark page as clean */
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}
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inline void
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ia64_set_rbs_bot (void)
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{
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unsigned long stack_size = current->signal->rlim[RLIMIT_STACK].rlim_max & -16;
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if (stack_size > MAX_USER_STACK_SIZE)
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stack_size = MAX_USER_STACK_SIZE;
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current->thread.rbs_bot = STACK_TOP - stack_size;
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}
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/*
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* This performs some platform-dependent address space initialization.
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* On IA-64, we want to setup the VM area for the register backing
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* store (which grows upwards) and install the gateway page which is
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* used for signal trampolines, etc.
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*/
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void
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ia64_init_addr_space (void)
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{
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struct vm_area_struct *vma;
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ia64_set_rbs_bot();
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/*
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* If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
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* the problem. When the process attempts to write to the register backing store
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* for the first time, it will get a SEGFAULT in this case.
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*/
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vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
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if (vma) {
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memset(vma, 0, sizeof(*vma));
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vma->vm_mm = current->mm;
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vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
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vma->vm_end = vma->vm_start + PAGE_SIZE;
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vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7];
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vma->vm_flags = VM_DATA_DEFAULT_FLAGS | VM_GROWSUP;
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down_write(¤t->mm->mmap_sem);
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if (insert_vm_struct(current->mm, vma)) {
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up_write(¤t->mm->mmap_sem);
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kmem_cache_free(vm_area_cachep, vma);
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return;
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}
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up_write(¤t->mm->mmap_sem);
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}
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/* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
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if (!(current->personality & MMAP_PAGE_ZERO)) {
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vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
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if (vma) {
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memset(vma, 0, sizeof(*vma));
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vma->vm_mm = current->mm;
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vma->vm_end = PAGE_SIZE;
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vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
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vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED;
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down_write(¤t->mm->mmap_sem);
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if (insert_vm_struct(current->mm, vma)) {
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up_write(¤t->mm->mmap_sem);
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kmem_cache_free(vm_area_cachep, vma);
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return;
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}
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up_write(¤t->mm->mmap_sem);
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}
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}
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}
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void
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free_initmem (void)
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{
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unsigned long addr, eaddr;
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addr = (unsigned long) ia64_imva(__init_begin);
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eaddr = (unsigned long) ia64_imva(__init_end);
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while (addr < eaddr) {
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ClearPageReserved(virt_to_page(addr));
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set_page_count(virt_to_page(addr), 1);
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free_page(addr);
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++totalram_pages;
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addr += PAGE_SIZE;
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}
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printk(KERN_INFO "Freeing unused kernel memory: %ldkB freed\n",
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(__init_end - __init_begin) >> 10);
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}
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void
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free_initrd_mem (unsigned long start, unsigned long end)
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{
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struct page *page;
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/*
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* EFI uses 4KB pages while the kernel can use 4KB or bigger.
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* Thus EFI and the kernel may have different page sizes. It is
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* therefore possible to have the initrd share the same page as
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* the end of the kernel (given current setup).
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*
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* To avoid freeing/using the wrong page (kernel sized) we:
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* - align up the beginning of initrd
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* - align down the end of initrd
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*
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* | |
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* |=============| a000
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* | |
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* | |
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* | | 9000
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* |/////////////|
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* |/////////////|
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* |=============| 8000
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* |///INITRD////|
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* |/////////////|
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* |/////////////| 7000
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* | |
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* |KKKKKKKKKKKKK|
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* |=============| 6000
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* |KKKKKKKKKKKKK|
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* |KKKKKKKKKKKKK|
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* K=kernel using 8KB pages
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*
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* In this example, we must free page 8000 ONLY. So we must align up
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* initrd_start and keep initrd_end as is.
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*/
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start = PAGE_ALIGN(start);
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end = end & PAGE_MASK;
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if (start < end)
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printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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if (!virt_addr_valid(start))
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continue;
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page = virt_to_page(start);
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ClearPageReserved(page);
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set_page_count(page, 1);
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free_page(start);
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++totalram_pages;
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}
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}
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/*
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* This installs a clean page in the kernel's page table.
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*/
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struct page *
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put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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if (!PageReserved(page))
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printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n",
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page_address(page));
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pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */
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spin_lock(&init_mm.page_table_lock);
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{
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pud = pud_alloc(&init_mm, pgd, address);
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if (!pud)
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goto out;
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pmd = pmd_alloc(&init_mm, pud, address);
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if (!pmd)
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goto out;
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pte = pte_alloc_map(&init_mm, pmd, address);
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if (!pte)
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goto out;
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if (!pte_none(*pte)) {
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pte_unmap(pte);
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goto out;
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}
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set_pte(pte, mk_pte(page, pgprot));
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pte_unmap(pte);
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}
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out: spin_unlock(&init_mm.page_table_lock);
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/* no need for flush_tlb */
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return page;
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}
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static void
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setup_gate (void)
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{
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struct page *page;
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/*
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* Map the gate page twice: once read-only to export the ELF
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* headers etc. and once execute-only page to enable
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* privilege-promotion via "epc":
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*/
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page = virt_to_page(ia64_imva(__start_gate_section));
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put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
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#ifdef HAVE_BUGGY_SEGREL
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page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
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put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
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#else
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put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
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/* Fill in the holes (if any) with read-only zero pages: */
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{
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unsigned long addr;
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for (addr = GATE_ADDR + PAGE_SIZE;
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addr < GATE_ADDR + PERCPU_PAGE_SIZE;
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addr += PAGE_SIZE)
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{
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put_kernel_page(ZERO_PAGE(0), addr,
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PAGE_READONLY);
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put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
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PAGE_READONLY);
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}
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}
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#endif
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ia64_patch_gate();
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}
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void __devinit
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ia64_mmu_init (void *my_cpu_data)
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{
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unsigned long psr, pta, impl_va_bits;
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extern void __devinit tlb_init (void);
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#ifdef CONFIG_DISABLE_VHPT
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# define VHPT_ENABLE_BIT 0
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#else
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# define VHPT_ENABLE_BIT 1
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#endif
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/* Pin mapping for percpu area into TLB */
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psr = ia64_clear_ic();
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ia64_itr(0x2, IA64_TR_PERCPU_DATA, PERCPU_ADDR,
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pte_val(pfn_pte(__pa(my_cpu_data) >> PAGE_SHIFT, PAGE_KERNEL)),
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PERCPU_PAGE_SHIFT);
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ia64_set_psr(psr);
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ia64_srlz_i();
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/*
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* Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
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* address space. The IA-64 architecture guarantees that at least 50 bits of
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* virtual address space are implemented but if we pick a large enough page size
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* (e.g., 64KB), the mapped address space is big enough that it will overlap with
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* VMLPT. I assume that once we run on machines big enough to warrant 64KB pages,
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* IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
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* problem in practice. Alternatively, we could truncate the top of the mapped
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* address space to not permit mappings that would overlap with the VMLPT.
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* --davidm 00/12/06
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*/
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# define pte_bits 3
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# define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
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/*
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* The virtual page table has to cover the entire implemented address space within
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* a region even though not all of this space may be mappable. The reason for
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* this is that the Access bit and Dirty bit fault handlers perform
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* non-speculative accesses to the virtual page table, so the address range of the
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* virtual page table itself needs to be covered by virtual page table.
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*/
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# define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits)
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# define POW2(n) (1ULL << (n))
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impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));
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if (impl_va_bits < 51 || impl_va_bits > 61)
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panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
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/*
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* mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
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* which must fit into "vmlpt_bits - pte_bits" slots. Second half of
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* the test makes sure that our mapped space doesn't overlap the
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* unimplemented hole in the middle of the region.
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*/
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if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
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(mapped_space_bits > impl_va_bits - 1))
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panic("Cannot build a big enough virtual-linear page table"
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" to cover mapped address space.\n"
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" Try using a smaller page size.\n");
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/* place the VMLPT at the end of each page-table mapped region: */
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pta = POW2(61) - POW2(vmlpt_bits);
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/*
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* Set the (virtually mapped linear) page table address. Bit
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* 8 selects between the short and long format, bits 2-7 the
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* size of the table, and bit 0 whether the VHPT walker is
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* enabled.
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*/
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ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);
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ia64_tlb_init();
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#ifdef CONFIG_HUGETLB_PAGE
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ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
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ia64_srlz_d();
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#endif
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}
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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int
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create_mem_map_page_table (u64 start, u64 end, void *arg)
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{
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unsigned long address, start_page, end_page;
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struct page *map_start, *map_end;
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int node;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
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map_end = vmem_map + (__pa(end) >> PAGE_SHIFT);
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start_page = (unsigned long) map_start & PAGE_MASK;
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end_page = PAGE_ALIGN((unsigned long) map_end);
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node = paddr_to_nid(__pa(start));
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for (address = start_page; address < end_page; address += PAGE_SIZE) {
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pgd = pgd_offset_k(address);
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if (pgd_none(*pgd))
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pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
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pud = pud_offset(pgd, address);
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if (pud_none(*pud))
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pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
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pmd = pmd_offset(pud, address);
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if (pmd_none(*pmd))
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pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
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pte = pte_offset_kernel(pmd, address);
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if (pte_none(*pte))
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set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT,
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PAGE_KERNEL));
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}
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return 0;
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}
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struct memmap_init_callback_data {
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struct page *start;
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struct page *end;
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int nid;
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unsigned long zone;
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};
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static int
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virtual_memmap_init (u64 start, u64 end, void *arg)
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{
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struct memmap_init_callback_data *args;
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struct page *map_start, *map_end;
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args = (struct memmap_init_callback_data *) arg;
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map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
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map_end = vmem_map + (__pa(end) >> PAGE_SHIFT);
|
|
|
|
if (map_start < args->start)
|
|
map_start = args->start;
|
|
if (map_end > args->end)
|
|
map_end = args->end;
|
|
|
|
/*
|
|
* We have to initialize "out of bounds" struct page elements that fit completely
|
|
* on the same pages that were allocated for the "in bounds" elements because they
|
|
* may be referenced later (and found to be "reserved").
|
|
*/
|
|
map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page);
|
|
map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end)
|
|
/ sizeof(struct page));
|
|
|
|
if (map_start < map_end)
|
|
memmap_init_zone((unsigned long)(map_end - map_start),
|
|
args->nid, args->zone, page_to_pfn(map_start));
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
memmap_init (unsigned long size, int nid, unsigned long zone,
|
|
unsigned long start_pfn)
|
|
{
|
|
if (!vmem_map)
|
|
memmap_init_zone(size, nid, zone, start_pfn);
|
|
else {
|
|
struct page *start;
|
|
struct memmap_init_callback_data args;
|
|
|
|
start = pfn_to_page(start_pfn);
|
|
args.start = start;
|
|
args.end = start + size;
|
|
args.nid = nid;
|
|
args.zone = zone;
|
|
|
|
efi_memmap_walk(virtual_memmap_init, &args);
|
|
}
|
|
}
|
|
|
|
int
|
|
ia64_pfn_valid (unsigned long pfn)
|
|
{
|
|
char byte;
|
|
struct page *pg = pfn_to_page(pfn);
|
|
|
|
return (__get_user(byte, (char __user *) pg) == 0)
|
|
&& ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK))
|
|
|| (__get_user(byte, (char __user *) (pg + 1) - 1) == 0));
|
|
}
|
|
EXPORT_SYMBOL(ia64_pfn_valid);
|
|
|
|
int
|
|
find_largest_hole (u64 start, u64 end, void *arg)
|
|
{
|
|
u64 *max_gap = arg;
|
|
|
|
static u64 last_end = PAGE_OFFSET;
|
|
|
|
/* NOTE: this algorithm assumes efi memmap table is ordered */
|
|
|
|
if (*max_gap < (start - last_end))
|
|
*max_gap = start - last_end;
|
|
last_end = end;
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_VIRTUAL_MEM_MAP */
|
|
|
|
static int
|
|
count_reserved_pages (u64 start, u64 end, void *arg)
|
|
{
|
|
unsigned long num_reserved = 0;
|
|
unsigned long *count = arg;
|
|
|
|
for (; start < end; start += PAGE_SIZE)
|
|
if (PageReserved(virt_to_page(start)))
|
|
++num_reserved;
|
|
*count += num_reserved;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Boot command-line option "nolwsys" can be used to disable the use of any light-weight
|
|
* system call handler. When this option is in effect, all fsyscalls will end up bubbling
|
|
* down into the kernel and calling the normal (heavy-weight) syscall handler. This is
|
|
* useful for performance testing, but conceivably could also come in handy for debugging
|
|
* purposes.
|
|
*/
|
|
|
|
static int nolwsys;
|
|
|
|
static int __init
|
|
nolwsys_setup (char *s)
|
|
{
|
|
nolwsys = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("nolwsys", nolwsys_setup);
|
|
|
|
void
|
|
mem_init (void)
|
|
{
|
|
long reserved_pages, codesize, datasize, initsize;
|
|
pg_data_t *pgdat;
|
|
int i;
|
|
static struct kcore_list kcore_mem, kcore_vmem, kcore_kernel;
|
|
|
|
BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
|
|
BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
|
|
BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE);
|
|
|
|
#ifdef CONFIG_PCI
|
|
/*
|
|
* This needs to be called _after_ the command line has been parsed but _before_
|
|
* any drivers that may need the PCI DMA interface are initialized or bootmem has
|
|
* been freed.
|
|
*/
|
|
platform_dma_init();
|
|
#endif
|
|
|
|
#ifndef CONFIG_DISCONTIGMEM
|
|
if (!mem_map)
|
|
BUG();
|
|
max_mapnr = max_low_pfn;
|
|
#endif
|
|
|
|
high_memory = __va(max_low_pfn * PAGE_SIZE);
|
|
|
|
kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE);
|
|
kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
|
|
kclist_add(&kcore_kernel, _stext, _end - _stext);
|
|
|
|
for_each_pgdat(pgdat)
|
|
if (pgdat->bdata->node_bootmem_map)
|
|
totalram_pages += free_all_bootmem_node(pgdat);
|
|
|
|
reserved_pages = 0;
|
|
efi_memmap_walk(count_reserved_pages, &reserved_pages);
|
|
|
|
codesize = (unsigned long) _etext - (unsigned long) _stext;
|
|
datasize = (unsigned long) _edata - (unsigned long) _etext;
|
|
initsize = (unsigned long) __init_end - (unsigned long) __init_begin;
|
|
|
|
printk(KERN_INFO "Memory: %luk/%luk available (%luk code, %luk reserved, "
|
|
"%luk data, %luk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT - 10),
|
|
num_physpages << (PAGE_SHIFT - 10), codesize >> 10,
|
|
reserved_pages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10);
|
|
|
|
|
|
/*
|
|
* For fsyscall entrpoints with no light-weight handler, use the ordinary
|
|
* (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
|
|
* code can tell them apart.
|
|
*/
|
|
for (i = 0; i < NR_syscalls; ++i) {
|
|
extern unsigned long fsyscall_table[NR_syscalls];
|
|
extern unsigned long sys_call_table[NR_syscalls];
|
|
|
|
if (!fsyscall_table[i] || nolwsys)
|
|
fsyscall_table[i] = sys_call_table[i] | 1;
|
|
}
|
|
setup_gate();
|
|
|
|
#ifdef CONFIG_IA32_SUPPORT
|
|
ia32_mem_init();
|
|
#endif
|
|
}
|