pgtable_32_areas.h (1582B)
1#ifndef _ASM_X86_PGTABLE_32_AREAS_H 2#define _ASM_X86_PGTABLE_32_AREAS_H 3 4#include <asm/cpu_entry_area.h> 5 6/* 7 * Just any arbitrary offset to the start of the vmalloc VM area: the 8 * current 8MB value just means that there will be a 8MB "hole" after the 9 * physical memory until the kernel virtual memory starts. That means that 10 * any out-of-bounds memory accesses will hopefully be caught. 11 * The vmalloc() routines leaves a hole of 4kB between each vmalloced 12 * area for the same reason. ;) 13 */ 14#define VMALLOC_OFFSET (8 * 1024 * 1024) 15 16#ifndef __ASSEMBLY__ 17extern bool __vmalloc_start_set; /* set once high_memory is set */ 18#endif 19 20#define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET) 21#ifdef CONFIG_X86_PAE 22#define LAST_PKMAP 512 23#else 24#define LAST_PKMAP 1024 25#endif 26 27#define CPU_ENTRY_AREA_PAGES (NR_CPUS * DIV_ROUND_UP(sizeof(struct cpu_entry_area), PAGE_SIZE)) 28 29/* The +1 is for the readonly IDT page: */ 30#define CPU_ENTRY_AREA_BASE \ 31 ((FIXADDR_TOT_START - PAGE_SIZE*(CPU_ENTRY_AREA_PAGES+1)) & PMD_MASK) 32 33#define LDT_BASE_ADDR \ 34 ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK) 35 36#define LDT_END_ADDR (LDT_BASE_ADDR + PMD_SIZE) 37 38#define PKMAP_BASE \ 39 ((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK) 40 41#ifdef CONFIG_HIGHMEM 42# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) 43#else 44# define VMALLOC_END (LDT_BASE_ADDR - 2 * PAGE_SIZE) 45#endif 46 47#define MODULES_VADDR VMALLOC_START 48#define MODULES_END VMALLOC_END 49#define MODULES_LEN (MODULES_VADDR - MODULES_END) 50 51#define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) 52 53#endif /* _ASM_X86_PGTABLE_32_AREAS_H */