| #ifndef _ASM_X86_PGTABLE_32_DEFS_H |
| #define _ASM_X86_PGTABLE_32_DEFS_H |
| |
| /* |
| * The Linux x86 paging architecture is 'compile-time dual-mode', it |
| * implements both the traditional 2-level x86 page tables and the |
| * newer 3-level PAE-mode page tables. |
| */ |
| #ifdef CONFIG_X86_PAE |
| # include <asm/pgtable-3level_types.h> |
| # define PMD_SIZE (1UL << PMD_SHIFT) |
| # define PMD_MASK (~(PMD_SIZE - 1)) |
| #else |
| # include <asm/pgtable-2level_types.h> |
| #endif |
| |
| #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE - 1)) |
| |
| /* Just any arbitrary offset to the start of the vmalloc VM area: the |
| * current 8MB value just means that there will be a 8MB "hole" after the |
| * physical memory until the kernel virtual memory starts. That means that |
| * any out-of-bounds memory accesses will hopefully be caught. |
| * The vmalloc() routines leaves a hole of 4kB between each vmalloced |
| * area for the same reason. ;) |
| */ |
| #define VMALLOC_OFFSET (8 * 1024 * 1024) |
| |
| #ifndef __ASSEMBLY__ |
| extern bool __vmalloc_start_set; /* set once high_memory is set */ |
| #endif |
| |
| #define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET) |
| #ifdef CONFIG_X86_PAE |
| #define LAST_PKMAP 512 |
| #else |
| #define LAST_PKMAP 1024 |
| #endif |
| |
| #define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1)) \ |
| & PMD_MASK) |
| |
| #ifdef CONFIG_HIGHMEM |
| # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) |
| #else |
| # define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE) |
| #endif |
| |
| #define MODULES_VADDR VMALLOC_START |
| #define MODULES_END VMALLOC_END |
| #define MODULES_LEN (MODULES_VADDR - MODULES_END) |
| |
| #define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) |
| |
| #endif /* _ASM_X86_PGTABLE_32_DEFS_H */ |