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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PGTABLE_32_H
3#define _ASM_X86_PGTABLE_32_H
4
5#include <asm/pgtable_32_types.h>
6
7/*
8 * The Linux memory management assumes a three-level page table setup. On
9 * the i386, we use that, but "fold" the mid level into the top-level page
10 * table, so that we physically have the same two-level page table as the
11 * i386 mmu expects.
12 *
13 * This file contains the functions and defines necessary to modify and use
14 * the i386 page table tree.
15 */
16#ifndef __ASSEMBLY__
17#include <asm/processor.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];
30extern pmd_t initial_pg_pmd[];
31
32static inline void pgtable_cache_init(void) { }
33static inline void check_pgt_cache(void) { }
34void paging_init(void);
35void sync_initial_page_table(void);
36
37/*
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( ..)'
41 */
42#undef TEST_ACCESS_OK
43
44#ifdef CONFIG_X86_PAE
45# include <asm/pgtable-3level.h>
46#else
47# include <asm/pgtable-2level.h>
48#endif
49
50#if defined(CONFIG_HIGHPTE)
51#define pte_offset_map(dir, address) \
52 ((pte_t *)kmap_atomic(pmd_page(*(dir))) + \
53 pte_index((address)))
54#define pte_unmap(pte) kunmap_atomic((pte))
55#else
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)
59#endif
60
61/* Clear a kernel PTE and flush it from the TLB */
62#define kpte_clear_flush(ptep, vaddr) \
63do { \
64 pte_clear(&init_mm, (vaddr), (ptep)); \
65 __flush_tlb_one_kernel((vaddr)); \
66} while (0)
67
68#endif /* !__ASSEMBLY__ */
69
70/*
71 * kern_addr_valid() is (1) for FLATMEM and (0) for
72 * SPARSEMEM and DISCONTIGMEM
73 */
74#ifdef CONFIG_FLATMEM
75#define kern_addr_valid(addr) (1)
76#else
77#define kern_addr_valid(kaddr) (0)
78#endif
79
80/*
81 * This is how much memory in addition to the memory covered up to
82 * and including _end we need mapped initially.
83 * We need:
84 * (KERNEL_IMAGE_SIZE/4096) / 1024 pages (worst case, non PAE)
85 * (KERNEL_IMAGE_SIZE/4096) / 512 + 4 pages (worst case for PAE)
86 *
87 * Modulo rounding, each megabyte assigned here requires a kilobyte of
88 * memory, which is currently unreclaimed.
89 *
90 * This should be a multiple of a page.
91 *
92 * KERNEL_IMAGE_SIZE should be greater than pa(_end)
93 * and small than max_low_pfn, otherwise will waste some page table entries
94 */
95#if PTRS_PER_PMD > 1
96#define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD)
97#else
98#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD)
99#endif
100
101/*
102 * Number of possible pages in the lowmem region.
103 *
104 * We shift 2 by 31 instead of 1 by 32 to the left in order to avoid a
105 * gas warning about overflowing shift count when gas has been compiled
106 * with only a host target support using a 32-bit type for internal
107 * representation.
108 */
109#define LOWMEM_PAGES ((((2<<31) - __PAGE_OFFSET) >> PAGE_SHIFT))
110
111#endif /* _ASM_X86_PGTABLE_32_H */
112

Warning: That file was not part of the compilation database. It may have many parsing errors.