author | Florian Westphal <fw@strlen.de> |
Sun, 11 Jan 2009 20:20:11 +0100 | |
changeset 0 | aa628870c1d3 |
child 2 | d1f6d8b6f81c |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _ASM_X86_PGTABLE_32_H |
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#define _ASM_X86_PGTABLE_32_H |
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Port of Linux 2.6.28 for use with network simulation cradle.
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Port of Linux 2.6.28 for use with network simulation cradle.
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Port of Linux 2.6.28 for use with network simulation cradle.
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/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* The Linux memory management assumes a three-level page table setup. On |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* the i386, we use that, but "fold" the mid level into the top-level page |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* table, so that we physically have the same two-level page table as the |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* i386 mmu expects. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* This file contains the functions and defines necessary to modify and use |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* the i386 page table tree. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef __ASSEMBLY__ |
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#include <asm/processor.h> |
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#include <asm/fixmap.h> |
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#include <linux/threads.h> |
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#include <asm/paravirt.h> |
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|
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#include <linux/bitops.h> |
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#include <linux/slab.h> |
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#include <linux/list.h> |
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#include <linux/spinlock.h> |
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struct mm_struct; |
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struct vm_area_struct; |
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extern pgd_t swapper_pg_dir[1024]; |
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static inline void pgtable_cache_init(void) { } |
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static inline void check_pgt_cache(void) { } |
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void paging_init(void); |
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extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t); |
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/* |
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* The Linux x86 paging architecture is 'compile-time dual-mode', it |
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* implements both the traditional 2-level x86 page tables and the |
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* newer 3-level PAE-mode page tables. |
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*/ |
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#ifdef CONFIG_X86_PAE |
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# include <asm/pgtable-3level-defs.h> |
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# define PMD_SIZE (1UL << PMD_SHIFT) |
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# define PMD_MASK (~(PMD_SIZE - 1)) |
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#else |
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# include <asm/pgtable-2level-defs.h> |
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#endif |
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
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#define PGDIR_MASK (~(PGDIR_SIZE - 1)) |
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|
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/* Just any arbitrary offset to the start of the vmalloc VM area: the |
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* current 8MB value just means that there will be a 8MB "hole" after the |
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* physical memory until the kernel virtual memory starts. That means that |
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* any out-of-bounds memory accesses will hopefully be caught. |
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* The vmalloc() routines leaves a hole of 4kB between each vmalloced |
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* area for the same reason. ;) |
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*/ |
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#define VMALLOC_OFFSET (8 * 1024 * 1024) |
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#define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET) |
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#ifdef CONFIG_X86_PAE |
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#define LAST_PKMAP 512 |
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#else |
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#define LAST_PKMAP 1024 |
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#endif |
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#define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1)) \ |
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& PMD_MASK) |
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|
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#ifdef CONFIG_HIGHMEM |
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# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) |
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#else |
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# define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE) |
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#endif |
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#define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) |
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/* |
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* Define this if things work differently on an i386 and an i486: |
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* it will (on an i486) warn about kernel memory accesses that are |
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* done without a 'access_ok(VERIFY_WRITE,..)' |
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*/ |
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#undef TEST_ACCESS_OK |
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|
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/* The boot page tables (all created as a single array) */ |
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extern unsigned long pg0[]; |
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#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE)) |
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|
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/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */ |
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#define pmd_none(x) (!(unsigned long)pmd_val((x))) |
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#define pmd_present(x) (pmd_val((x)) & _PAGE_PRESENT) |
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#define pmd_bad(x) ((pmd_val(x) & (PTE_FLAGS_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) |
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|
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#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) |
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|
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#ifdef CONFIG_X86_PAE |
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# include <asm/pgtable-3level.h> |
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#else |
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# include <asm/pgtable-2level.h> |
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#endif |
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|
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/* |
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* Macro to mark a page protection value as "uncacheable". |
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* On processors which do not support it, this is a no-op. |
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*/ |
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#define pgprot_noncached(prot) \ |
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((boot_cpu_data.x86 > 3) \ |
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? (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT)) \ |
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: (prot)) |
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/* |
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* Conversion functions: convert a page and protection to a page entry, |
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* and a page entry and page directory to the page they refer to. |
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*/ |
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) |
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static inline int pud_large(pud_t pud) { return 0; } |
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/* |
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* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] |
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* |
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* this macro returns the index of the entry in the pmd page which would |
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* control the given virtual address |
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*/ |
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#define pmd_index(address) \ |
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(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) |
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/* |
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* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] |
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* |
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* this macro returns the index of the entry in the pte page which would |
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* control the given virtual address |
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*/ |
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#define pte_index(address) \ |
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(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) |
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#define pte_offset_kernel(dir, address) \ |
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((pte_t *)pmd_page_vaddr(*(dir)) + pte_index((address))) |
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#define pmd_page(pmd) (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT)) |
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#define pmd_page_vaddr(pmd) \ |
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((unsigned long)__va(pmd_val((pmd)) & PTE_PFN_MASK)) |
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#if defined(CONFIG_HIGHPTE) |
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#define pte_offset_map(dir, address) \ |
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((pte_t *)kmap_atomic_pte(pmd_page(*(dir)), KM_PTE0) + \ |
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pte_index((address))) |
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#define pte_offset_map_nested(dir, address) \ |
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((pte_t *)kmap_atomic_pte(pmd_page(*(dir)), KM_PTE1) + \ |
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pte_index((address))) |
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#define pte_unmap(pte) kunmap_atomic((pte), KM_PTE0) |
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#define pte_unmap_nested(pte) kunmap_atomic((pte), KM_PTE1) |
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#else |
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#define pte_offset_map(dir, address) \ |
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((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address))) |
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#define pte_offset_map_nested(dir, address) pte_offset_map((dir), (address)) |
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#define pte_unmap(pte) do { } while (0) |
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#define pte_unmap_nested(pte) do { } while (0) |
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#endif |
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/* Clear a kernel PTE and flush it from the TLB */ |
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#define kpte_clear_flush(ptep, vaddr) \ |
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do { \ |
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pte_clear(&init_mm, (vaddr), (ptep)); \ |
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__flush_tlb_one((vaddr)); \ |
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} while (0) |
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/* |
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* The i386 doesn't have any external MMU info: the kernel page |
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* tables contain all the necessary information. |
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*/ |
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#define update_mmu_cache(vma, address, pte) do { } while (0) |
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#endif /* !__ASSEMBLY__ */ |
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/* |
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* kern_addr_valid() is (1) for FLATMEM and (0) for |
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* SPARSEMEM and DISCONTIGMEM |
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*/ |
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#ifdef CONFIG_FLATMEM |
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#define kern_addr_valid(addr) (1) |
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#else |
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#define kern_addr_valid(kaddr) (0) |
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#endif |
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#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ |
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remap_pfn_range(vma, vaddr, pfn, size, prot) |
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#endif /* _ASM_X86_PGTABLE_32_H */ |