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51c78eb3 JF |
1 | #ifndef _ASM_X86_PAGE_32_DEFS_H |
2 | #define _ASM_X86_PAGE_32_DEFS_H | |
3 | ||
4 | #include <linux/const.h> | |
5 | ||
6 | /* | |
7 | * This handles the memory map. | |
8 | * | |
9 | * A __PAGE_OFFSET of 0xC0000000 means that the kernel has | |
10 | * a virtual address space of one gigabyte, which limits the | |
11 | * amount of physical memory you can use to about 950MB. | |
12 | * | |
13 | * If you want more physical memory than this then see the CONFIG_HIGHMEM4G | |
14 | * and CONFIG_HIGHMEM64G options in the kernel configuration. | |
15 | */ | |
4a1a8e1b BP |
16 | #define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL) |
17 | #define __PAGE_OFFSET __PAGE_OFFSET_BASE | |
51c78eb3 | 18 | |
a0215061 KC |
19 | #define __START_KERNEL_map __PAGE_OFFSET |
20 | ||
38e7c572 TG |
21 | #define THREAD_SIZE_ORDER 1 |
22 | #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) | |
51c78eb3 | 23 | |
51c78eb3 JF |
24 | #define DOUBLEFAULT_STACK 1 |
25 | #define NMI_STACK 0 | |
26 | #define DEBUG_STACK 0 | |
27 | #define MCE_STACK 0 | |
28 | #define N_EXCEPTION_STACKS 1 | |
29 | ||
30 | #ifdef CONFIG_X86_PAE | |
31 | /* 44=32+12, the limit we can fit into an unsigned long pfn */ | |
32 | #define __PHYSICAL_MASK_SHIFT 44 | |
33 | #define __VIRTUAL_MASK_SHIFT 32 | |
51c78eb3 JF |
34 | |
35 | #else /* !CONFIG_X86_PAE */ | |
36 | #define __PHYSICAL_MASK_SHIFT 32 | |
37 | #define __VIRTUAL_MASK_SHIFT 32 | |
51c78eb3 JF |
38 | #endif /* CONFIG_X86_PAE */ |
39 | ||
7543c1de YL |
40 | /* |
41 | * Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S) | |
42 | */ | |
43 | #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) | |
44 | ||
51c78eb3 JF |
45 | #ifndef __ASSEMBLY__ |
46 | ||
51c78eb3 JF |
47 | /* |
48 | * This much address space is reserved for vmalloc() and iomap() | |
49 | * as well as fixmap mappings. | |
50 | */ | |
51 | extern unsigned int __VMALLOC_RESERVE; | |
52 | extern int sysctl_legacy_va_layout; | |
53 | ||
54 | extern void find_low_pfn_range(void); | |
51c78eb3 JF |
55 | extern void setup_bootmem_allocator(void); |
56 | ||
57 | #endif /* !__ASSEMBLY__ */ | |
58 | ||
59 | #endif /* _ASM_X86_PAGE_32_DEFS_H */ |