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5270 | serge | 1 | #ifndef _ASM_X86_PGTABLE_32_DEFS_H |
2 | #define _ASM_X86_PGTABLE_32_DEFS_H |
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3 | |||
4 | /* |
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5 | * The Linux x86 paging architecture is 'compile-time dual-mode', it |
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6 | * implements both the traditional 2-level x86 page tables and the |
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7 | * newer 3-level PAE-mode page tables. |
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8 | */ |
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9 | #ifdef CONFIG_X86_PAE |
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10 | # include |
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11 | # define PMD_SIZE (1UL << PMD_SHIFT) |
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12 | # define PMD_MASK (~(PMD_SIZE - 1)) |
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13 | #else |
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14 | # include |
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15 | #endif |
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16 | |||
17 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
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18 | #define PGDIR_MASK (~(PGDIR_SIZE - 1)) |
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19 | |||
20 | /* Just any arbitrary offset to the start of the vmalloc VM area: the |
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21 | * current 8MB value just means that there will be a 8MB "hole" after the |
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22 | * physical memory until the kernel virtual memory starts. That means that |
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23 | * any out-of-bounds memory accesses will hopefully be caught. |
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24 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced |
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25 | * area for the same reason. ;) |
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26 | */ |
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27 | #define VMALLOC_OFFSET (8 * 1024 * 1024) |
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28 | |||
29 | #ifndef __ASSEMBLY__ |
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30 | extern bool __vmalloc_start_set; /* set once high_memory is set */ |
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31 | #endif |
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32 | |||
33 | #define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET) |
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34 | #ifdef CONFIG_X86_PAE |
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35 | #define LAST_PKMAP 512 |
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36 | #else |
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37 | #define LAST_PKMAP 1024 |
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38 | #endif |
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39 | |||
40 | #define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \ |
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41 | & PMD_MASK) |
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42 | |||
43 | #ifdef CONFIG_HIGHMEM |
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44 | # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) |
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45 | #else |
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46 | # define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE) |
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47 | #endif |
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48 | |||
49 | #define MODULES_VADDR VMALLOC_START |
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50 | #define MODULES_END VMALLOC_END |
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51 | #define MODULES_LEN (MODULES_VADDR - MODULES_END) |
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52 | |||
53 | #define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) |
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54 | |||
55 | #endif /* _ASM_X86_PGTABLE_32_DEFS_H */><>><> |