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Linux kernel mirror (for testing)
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linux
1#ifndef _ASM_X86_PGTABLE_32_H
2#define _ASM_X86_PGTABLE_32_H
3
4#include <asm/pgtable_32_types.h>
5
6/*
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
10 * i386 mmu expects.
11 *
12 * This file contains the functions and defines necessary to modify and use
13 * the i386 page table tree.
14 */
15#ifndef __ASSEMBLY__
16#include <asm/processor.h>
17#include <asm/fixmap.h>
18#include <linux/threads.h>
19#include <asm/paravirt.h>
20
21#include <linux/bitops.h>
22#include <linux/list.h>
23#include <linux/spinlock.h>
24
25struct mm_struct;
26struct vm_area_struct;
27
28extern pgd_t swapper_pg_dir[1024];
29extern pgd_t initial_page_table[1024];
30
31static inline void pgtable_cache_init(void) { }
32static inline void check_pgt_cache(void) { }
33void paging_init(void);
34
35extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
36
37
38/*
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,..)'
42 */
43#undef TEST_ACCESS_OK
44
45#ifdef CONFIG_X86_PAE
46# include <asm/pgtable-3level.h>
47#else
48# include <asm/pgtable-2level.h>
49#endif
50
51#if defined(CONFIG_HIGHPTE)
52#define pte_offset_map(dir, address) \
53 ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \
54 pte_index((address)))
55#define pte_unmap(pte) kunmap_atomic((pte))
56#else
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)
60#endif
61
62/* Clear a kernel PTE and flush it from the TLB */
63#define kpte_clear_flush(ptep, vaddr) \
64do { \
65 pte_clear(&init_mm, (vaddr), (ptep)); \
66 __flush_tlb_one((vaddr)); \
67} while (0)
68
69#endif /* !__ASSEMBLY__ */
70
71/*
72 * kern_addr_valid() is (1) for FLATMEM and (0) for
73 * SPARSEMEM and DISCONTIGMEM
74 */
75#ifdef CONFIG_FLATMEM
76#define kern_addr_valid(addr) (1)
77#else
78#define kern_addr_valid(kaddr) (0)
79#endif
80
81#endif /* _ASM_X86_PGTABLE_32_H */