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84 lines
2.3 KiB
84 lines
2.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_PGTABLE_32_H |
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#define _ASM_X86_PGTABLE_32_H |
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#include <asm/pgtable_32_types.h> |
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/* |
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* The Linux memory management assumes a three-level page table setup. On |
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* the i386, we use that, but "fold" the mid level into the top-level page |
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* table, so that we physically have the same two-level page table as the |
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* i386 mmu expects. |
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* |
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* This file contains the functions and defines necessary to modify and use |
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* the i386 page table tree. |
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*/ |
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#ifndef __ASSEMBLY__ |
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#include <asm/processor.h> |
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#include <linux/threads.h> |
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#include <asm/paravirt.h> |
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#include <linux/bitops.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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extern pgd_t initial_page_table[1024]; |
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extern pmd_t initial_pg_pmd[]; |
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void paging_init(void); |
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void sync_initial_page_table(void); |
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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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/* 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_kernel((vaddr)); \ |
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} 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 SPARSEMEM |
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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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/* |
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* This is used to calculate the .brk reservation for initial pagetables. |
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* Enough space is reserved to allocate pagetables sufficient to cover all |
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* of LOWMEM_PAGES, which is an upper bound on the size of the direct map of |
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* lowmem. |
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* |
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* With PAE paging (PTRS_PER_PMD > 1), we allocate PTRS_PER_PGD == 4 pages for |
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* the PMD's in addition to the pages required for the last level pagetables. |
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*/ |
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#if PTRS_PER_PMD > 1 |
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#define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD) |
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#else |
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#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD) |
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#endif |
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/* |
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* Number of possible pages in the lowmem region. |
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* |
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* We shift 2 by 31 instead of 1 by 32 to the left in order to avoid a |
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* gas warning about overflowing shift count when gas has been compiled |
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* with only a host target support using a 32-bit type for internal |
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* representation. |
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*/ |
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#define LOWMEM_PAGES ((((_ULL(2)<<31) - __PAGE_OFFSET) >> PAGE_SHIFT)) |
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#endif /* _ASM_X86_PGTABLE_32_H */
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