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 pgtable_l5_enabled() 0
19
20#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
21#define PGDIR_MASK (~(PGDIR_SIZE - 1))
22
23/* Just any arbitrary offset to the start of the vmalloc VM area: the
24 * current 8MB value just means that there will be a 8MB "hole" after the
25 * physical memory until the kernel virtual memory starts. That means that
26 * any out-of-bounds memory accesses will hopefully be caught.
27 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
28 * area for the same reason. ;)
29 */
30#define VMALLOC_OFFSET (8 * 1024 * 1024)
31
32#ifndef __ASSEMBLY__
33extern bool __vmalloc_start_set; /* set once high_memory is set */
34#endif
35
36#define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET)
37#ifdef CONFIG_X86_PAE
38#define LAST_PKMAP 512
39#else
40#define LAST_PKMAP 1024
41#endif
42
43/*
44 * Define this here and validate with BUILD_BUG_ON() in pgtable_32.c
45 * to avoid include recursion hell
46 */
47#define CPU_ENTRY_AREA_PAGES (NR_CPUS * 40)
48
49#define CPU_ENTRY_AREA_BASE \
50 ((FIXADDR_TOT_START - PAGE_SIZE * (CPU_ENTRY_AREA_PAGES + 1)) \
51 & PMD_MASK)
52
53#define LDT_BASE_ADDR \
54 ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)
55
56#define LDT_END_ADDR (LDT_BASE_ADDR + PMD_SIZE)
57
58#define PKMAP_BASE \
59 ((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)
60
61#ifdef CONFIG_HIGHMEM
62# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE)
63#else
64# define VMALLOC_END (LDT_BASE_ADDR - 2 * PAGE_SIZE)
65#endif
66
67#define MODULES_VADDR VMALLOC_START
68#define MODULES_END VMALLOC_END
69#define MODULES_LEN (MODULES_VADDR - MODULES_END)
70
71#define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
72
73#endif /* _ASM_X86_PGTABLE_32_DEFS_H */
74