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 */
54