1 #ifndef _ASM_X86_PGTABLE_32_H
2 #define _ASM_X86_PGTABLE_32_H
4 #include <asm/pgtable_32_types.h>
7 * The Linux memory management assumes a three-level page table setup. On
8 * the i386, we use that, but "fold" the mid level into the top-level page
9 * table, so that we physically have the same two-level page table as the
12 * This file contains the functions and defines necessary to modify and use
13 * the i386 page table tree.
16 #include <asm/processor.h>
17 #include <asm/fixmap.h>
18 #include <linux/threads.h>
20 #include <linux/bitops.h>
21 #include <linux/list.h>
22 #include <linux/spinlock.h>
23 #include <linux/sched.h>
25 struct vm_area_struct;
27 extern pgd_t *swapper_pg_dir;
28 extern pgd_t initial_page_table[1024];
30 static inline void pgtable_cache_init(void) { }
31 static inline void check_pgt_cache(void) { }
32 void paging_init(void);
34 extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
38 * Define this if things work differently on an i386 and an i486:
39 * it will (on an i486) warn about kernel memory accesses that are
40 * done without a 'access_ok(VERIFY_WRITE,..)'
45 # include <asm/pgtable-3level.h>
47 # include <asm/pgtable-2level.h>
50 #if defined(CONFIG_HIGHPTE)
51 #define pte_offset_map(dir, address) \
52 ((pte_t *)kmap_atomic_pte(pmd_page(*(dir))) + \
54 #define pte_unmap(pte) kunmap_atomic((pte))
56 #define pte_offset_map(dir, address) \
57 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
58 #define pte_unmap(pte) do { } while (0)
61 /* Clear a kernel PTE and flush it from the TLB */
62 #define kpte_clear_flush(ptep, vaddr) \
64 if (HYPERVISOR_update_va_mapping(vaddr, __pte(0), UVMF_INVLPG)) \
69 * The i386 doesn't have any external MMU info: the kernel page
70 * tables contain all the necessary information.
72 #define update_mmu_cache(vma, address, ptep) do { } while (0)
74 void make_lowmem_page_readonly(void *va, unsigned int feature);
75 void make_lowmem_page_writable(void *va, unsigned int feature);
77 #endif /* !__ASSEMBLY__ */
80 * kern_addr_valid() is (1) for FLATMEM and (0) for
81 * SPARSEMEM and DISCONTIGMEM
84 #define kern_addr_valid(addr) (1)
86 #define kern_addr_valid(kaddr) (0)
89 #endif /* _ASM_X86_PGTABLE_32_H */