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) 28 29 #ifndef __ASSEMBLY__ 30 extern bool __vmalloc_start_set; /* set once high_memory is set */ 31 #endif 32 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_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 MODULES_VADDR VMALLOC_START 50 #define MODULES_END VMALLOC_END 51 #define MODULES_LEN (MODULES_VADDR - MODULES_END) 52 53 #define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) 54 55 #endif /* _ASM_X86_PGTABLE_32_DEFS_H */ 56