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>
19 #include <asm/paravirt.h>
21 #include <linux/bitops.h>
22 #include <linux/list.h>
23 #include <linux/spinlock.h>
26 struct vm_area_struct
;
28 extern pgd_t swapper_pg_dir
[1024];
29 extern pgd_t initial_page_table
[1024];
31 static inline void pgtable_cache_init(void) { }
32 static inline void check_pgt_cache(void) { }
33 void paging_init(void);
35 extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t
);
39 * Define this if things work differently on an i386 and an i486:
40 * it will (on an i486) warn about kernel memory accesses that are
41 * done without a 'access_ok(VERIFY_WRITE,..)'
46 # include <asm/pgtable-3level.h>
48 # include <asm/pgtable-2level.h>
51 #if defined(CONFIG_HIGHPTE)
52 #define pte_offset_map(dir, address) \
53 ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \
55 #define pte_unmap(pte) kunmap_atomic((pte))
57 #define pte_offset_map(dir, address) \
58 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
59 #define pte_unmap(pte) do { } while (0)
62 /* Clear a kernel PTE and flush it from the TLB */
63 #define kpte_clear_flush(ptep, vaddr) \
65 pte_clear(&init_mm, (vaddr), (ptep)); \
66 __flush_tlb_one((vaddr)); \
69 #endif /* !__ASSEMBLY__ */
72 * kern_addr_valid() is (1) for FLATMEM and (0) for
73 * SPARSEMEM and DISCONTIGMEM
76 #define kern_addr_valid(addr) (1)
78 #define kern_addr_valid(kaddr) (0)
81 #endif /* _ASM_X86_PGTABLE_32_H */