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__ 17 extern 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 */ 54