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f402a65f JF |
1 | #ifndef _ASM_X86_PGTABLE_32_DEFS_H |
2 | #define _ASM_X86_PGTABLE_32_DEFS_H | |
3 | ||
4 | /* | |
5 | * The Linux x86 paging architecture is 'compile-time dual-mode', it | |
6 | * implements both the traditional 2-level x86 page tables and the | |
7 | * newer 3-level PAE-mode page tables. | |
8 | */ | |
9 | #ifdef CONFIG_X86_PAE | |
10 | # include <asm/pgtable-3level_types.h> | |
11 | # define PMD_SIZE (1UL << PMD_SHIFT) | |
12 | # define PMD_MASK (~(PMD_SIZE - 1)) | |
13 | #else | |
14 | # include <asm/pgtable-2level_types.h> | |
15 | #endif | |
16 | ||
17 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | |
18 | #define PGDIR_MASK (~(PGDIR_SIZE - 1)) | |
19 | ||
20 | /* Just any arbitrary offset to the start of the vmalloc VM area: the | |
21 | * current 8MB value just means that there will be a 8MB "hole" after the | |
22 | * physical memory until the kernel virtual memory starts. That means that | |
23 | * any out-of-bounds memory accesses will hopefully be caught. | |
24 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
25 | * area for the same reason. ;) | |
26 | */ | |
27 | #define VMALLOC_OFFSET (8 * 1024 * 1024) | |
dc16ecf7 JF |
28 | |
29 | #ifndef __ASSEMBLER__ | |
30 | extern bool __vmalloc_start_set; /* set once high_memory is set */ | |
31 | #endif | |
32 | ||
f402a65f JF |
33 | #define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET) |
34 | #ifdef CONFIG_X86_PAE | |
35 | #define LAST_PKMAP 512 | |
36 | #else | |
37 | #define LAST_PKMAP 1024 | |
38 | #endif | |
39 | ||
40 | #define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1)) \ | |
41 | & PMD_MASK) | |
42 | ||
43 | #ifdef CONFIG_HIGHMEM | |
44 | # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) | |
45 | #else | |
46 | # define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE) | |
47 | #endif | |
48 | ||
49 | #define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) | |
50 | ||
51 | #endif /* _ASM_X86_PGTABLE_32_DEFS_H */ |