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