1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PGTABLE_32_DEFS_H 3 #define _ASM_X86_PGTABLE_32_DEFS_H 4 5 /* 6 * The Linux x86 paging architecture is 'compile-time dual-mode', it 7 * implements both the traditional 2-level x86 page tables and the 8 * newer 3-level PAE-mode page tables. 9 */ 10 #ifdef CONFIG_X86_PAE 11 # include <asm/pgtable-3level_types.h> 12 # define PMD_SIZE (1UL << PMD_SHIFT) 13 # define PMD_MASK (~(PMD_SIZE - 1)) 14 #else 15 # include <asm/pgtable-2level_types.h> 16 #endif 17 18 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 19 #define PGDIR_MASK (~(PGDIR_SIZE - 1)) 20 21 /* Just any arbitrary offset to the start of the vmalloc VM area: the 22 * current 8MB value just means that there will be a 8MB "hole" after the 23 * physical memory until the kernel virtual memory starts. That means that 24 * any out-of-bounds memory accesses will hopefully be caught. 25 * The vmalloc() routines leaves a hole of 4kB between each vmalloced 26 * area for the same reason. ;) 27 */ 28 #define VMALLOC_OFFSET (8 * 1024 * 1024) 29 30 #ifndef __ASSEMBLY__ 31 extern bool __vmalloc_start_set; /* set once high_memory is set */ 32 #endif 33 34 #define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET) 35 #ifdef CONFIG_X86_PAE 36 #define LAST_PKMAP 512 37 #else 38 #define LAST_PKMAP 1024 39 #endif 40 41 /* 42 * Define this here and validate with BUILD_BUG_ON() in pgtable_32.c 43 * to avoid include recursion hell 44 */ 45 #define CPU_ENTRY_AREA_PAGES (NR_CPUS * 40) 46 47 #define CPU_ENTRY_AREA_BASE \ 48 ((FIXADDR_TOT_START - PAGE_SIZE * (CPU_ENTRY_AREA_PAGES + 1)) \ 49 & PMD_MASK) 50 51 #define PKMAP_BASE \ 52 ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK) 53 54 #ifdef CONFIG_HIGHMEM 55 # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) 56 #else 57 # define VMALLOC_END (CPU_ENTRY_AREA_BASE - 2 * PAGE_SIZE) 58 #endif 59 60 #define MODULES_VADDR VMALLOC_START 61 #define MODULES_END VMALLOC_END 62 #define MODULES_LEN (MODULES_VADDR - MODULES_END) 63 64 #define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE) 65 66 #endif /* _ASM_X86_PGTABLE_32_DEFS_H */ 67