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__ 30extern 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_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 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