diff options
Diffstat (limited to 'arch/x86/include/asm/pgtable_32.h')
| -rw-r--r-- | arch/x86/include/asm/pgtable_32.h | 58 |
1 files changed, 26 insertions, 32 deletions
diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h index 9ee322103c6d..b612cc57a4d3 100644 --- a/arch/x86/include/asm/pgtable_32.h +++ b/arch/x86/include/asm/pgtable_32.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_PGTABLE_32_H #define _ASM_X86_PGTABLE_32_H @@ -12,9 +13,8 @@ * This file contains the functions and defines necessary to modify and use * the i386 page table tree. */ -#ifndef __ASSEMBLY__ +#ifndef __ASSEMBLER__ #include <asm/processor.h> -#include <asm/fixmap.h> #include <linux/threads.h> #include <asm/paravirt.h> @@ -27,20 +27,10 @@ struct vm_area_struct; extern pgd_t swapper_pg_dir[1024]; extern pgd_t initial_page_table[1024]; +extern pmd_t initial_pg_pmd[]; -static inline void pgtable_cache_init(void) { } -static inline void check_pgt_cache(void) { } void paging_init(void); - -extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t); - - -/* - * Define this if things work differently on an i386 and an i486: - * it will (on an i486) warn about kernel memory accesses that are - * done without a 'access_ok(VERIFY_WRITE,..)' - */ -#undef TEST_ACCESS_OK +void sync_initial_page_table(void); #ifdef CONFIG_X86_PAE # include <asm/pgtable-3level.h> @@ -48,34 +38,38 @@ extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t); # include <asm/pgtable-2level.h> #endif -#if defined(CONFIG_HIGHPTE) -#define pte_offset_map(dir, address) \ - ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \ - pte_index((address))) -#define pte_unmap(pte) kunmap_atomic((pte)) -#else -#define pte_offset_map(dir, address) \ - ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address))) -#define pte_unmap(pte) do { } while (0) -#endif - /* Clear a kernel PTE and flush it from the TLB */ #define kpte_clear_flush(ptep, vaddr) \ do { \ pte_clear(&init_mm, (vaddr), (ptep)); \ - __flush_tlb_one((vaddr)); \ + flush_tlb_one_kernel((vaddr)); \ } while (0) -#endif /* !__ASSEMBLY__ */ +#endif /* !__ASSEMBLER__ */ /* - * kern_addr_valid() is (1) for FLATMEM and (0) for - * SPARSEMEM and DISCONTIGMEM + * This is used to calculate the .brk reservation for initial pagetables. + * Enough space is reserved to allocate pagetables sufficient to cover all + * of LOWMEM_PAGES, which is an upper bound on the size of the direct map of + * lowmem. + * + * With PAE paging (PTRS_PER_PMD > 1), we allocate PTRS_PER_PGD == 4 pages for + * the PMD's in addition to the pages required for the last level pagetables. */ -#ifdef CONFIG_FLATMEM -#define kern_addr_valid(addr) (1) +#if PTRS_PER_PMD > 1 +#define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD) #else -#define kern_addr_valid(kaddr) (0) +#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD) #endif +/* + * Number of possible pages in the lowmem region. + * + * We shift 2 by 31 instead of 1 by 32 to the left in order to avoid a + * gas warning about overflowing shift count when gas has been compiled + * with only a host target support using a 32-bit type for internal + * representation. + */ +#define LOWMEM_PAGES ((((_ULL(2)<<31) - __PAGE_OFFSET) >> PAGE_SHIFT)) + #endif /* _ASM_X86_PGTABLE_32_H */ |