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 */ 16#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL) 17 18#ifdef CONFIG_4KSTACKS 19#define THREAD_ORDER 0 20#else 21#define THREAD_ORDER 1 22#endif 23#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 24 25#define STACKFAULT_STACK 0 26#define DOUBLEFAULT_STACK 1 27#define NMI_STACK 0 28#define DEBUG_STACK 0 29#define MCE_STACK 0 30#define N_EXCEPTION_STACKS 1 31 32#ifdef CONFIG_X86_PAE 33/* 44=32+12, the limit we can fit into an unsigned long pfn */ 34#define __PHYSICAL_MASK_SHIFT 44 35#define __VIRTUAL_MASK_SHIFT 32 36 37#else /* !CONFIG_X86_PAE */ 38#define __PHYSICAL_MASK_SHIFT 32 39#define __VIRTUAL_MASK_SHIFT 32 40#endif /* CONFIG_X86_PAE */ 41 42/* 43 * Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S) 44 */ 45#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 46 47#ifndef __ASSEMBLY__ 48 49/* 50 * This much address space is reserved for vmalloc() and iomap() 51 * as well as fixmap mappings. 52 */ 53extern unsigned int __VMALLOC_RESERVE; 54extern int sysctl_legacy_va_layout; 55 56extern void find_low_pfn_range(void); 57extern void setup_bootmem_allocator(void); 58 59#endif /* !__ASSEMBLY__ */ 60 61#endif /* _ASM_X86_PAGE_32_DEFS_H */ 62