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
35/*
36 * Define this if things work differently on an i386 and an i486:
37 * it will (on an i486) warn about kernel memory accesses that are
38 * done without a 'access_ok(VERIFY_WRITE,..)'
39 */
40#undef TEST_ACCESS_OK
41
42#ifdef CONFIG_X86_PAE
43# include <asm/pgtable-3level.h>
44#else
45# include <asm/pgtable-2level.h>
46#endif
47
48#if defined(CONFIG_HIGHPTE)
49#define pte_offset_map(dir, address)					\
50	((pte_t *)kmap_atomic(pmd_page(*(dir))) +		\
51	 pte_index((address)))
52#define pte_unmap(pte) kunmap_atomic((pte))
53#else
54#define pte_offset_map(dir, address)					\
55	((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
56#define pte_unmap(pte) do { } while (0)
57#endif
58
59/* Clear a kernel PTE and flush it from the TLB */
60#define kpte_clear_flush(ptep, vaddr)		\
61do {						\
62	pte_clear(&init_mm, (vaddr), (ptep));	\
63	__flush_tlb_one((vaddr));		\
64} while (0)
65
66#endif /* !__ASSEMBLY__ */
67
68/*
69 * kern_addr_valid() is (1) for FLATMEM and (0) for
70 * SPARSEMEM and DISCONTIGMEM
71 */
72#ifdef CONFIG_FLATMEM
73#define kern_addr_valid(addr)	(1)
74#else
75#define kern_addr_valid(kaddr)	(0)
76#endif
77
78#endif /* _ASM_X86_PGTABLE_32_H */
79