| #ifndef _I386_PAGE_H |
| #define _I386_PAGE_H |
| |
| /* PAGE_SHIFT determines the page size */ |
| #define PAGE_SHIFT 12 |
| #define PAGE_SIZE (1UL << PAGE_SHIFT) |
| #define PAGE_MASK (~(PAGE_SIZE-1)) |
| |
| #ifdef __KERNEL__ |
| #ifndef __ASSEMBLY__ |
| |
| #include <linux/config.h> |
| |
| #ifdef CONFIG_X86_USE_3DNOW |
| |
| #include <asm/mmx.h> |
| |
| #define clear_page(page) mmx_clear_page((void *)(page)) |
| #define copy_page(to,from) mmx_copy_page(to,from) |
| |
| #else |
| |
| /* |
| * On older X86 processors its not a win to use MMX here it seems. |
| * Maybe the K6-III ? |
| */ |
| |
| #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) |
| #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) |
| |
| #endif |
| |
| #define clear_user_page(page, vaddr) clear_page(page) |
| #define copy_user_page(to, from, vaddr) copy_page(to, from) |
| |
| /* |
| * These are used to make use of C type-checking.. |
| */ |
| #if CONFIG_X86_PAE |
| typedef struct { unsigned long pte_low, pte_high; } pte_t; |
| typedef struct { unsigned long long pmd; } pmd_t; |
| typedef struct { unsigned long long pgd; } pgd_t; |
| #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) |
| #define __pte(x) ({ pte_t __pte = {(x), (x) >> 32}; __pte; }) |
| #else |
| typedef struct { unsigned long pte_low; } pte_t; |
| typedef struct { unsigned long pmd; } pmd_t; |
| typedef struct { unsigned long pgd; } pgd_t; |
| #define pte_val(x) ((x).pte_low) |
| #define __pte(x) ((pte_t) { (x) } ) |
| #endif |
| #define PTE_MASK PAGE_MASK |
| |
| typedef struct { unsigned long pgprot; } pgprot_t; |
| |
| #define pmd_val(x) ((x).pmd) |
| #define pgd_val(x) ((x).pgd) |
| #define pgprot_val(x) ((x).pgprot) |
| |
| #define __pmd(x) ((pmd_t) { (x) } ) |
| #define __pgd(x) ((pgd_t) { (x) } ) |
| #define __pgprot(x) ((pgprot_t) { (x) } ) |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| /* to align the pointer to the (next) page boundary */ |
| #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) |
| |
| /* |
| * This handles the memory map.. We could make this a config |
| * option, but too many people screw it up, and too few need |
| * it. |
| * |
| * A __PAGE_OFFSET of 0xC0000000 means that the kernel has |
| * a virtual address space of one gigabyte, which limits the |
| * amount of physical memory you can use to about 950MB. |
| * |
| * If you want more physical memory than this then see the CONFIG_HIGHMEM4G |
| * and CONFIG_HIGHMEM64G options in the kernel configuration. |
| */ |
| |
| #define __PAGE_OFFSET (0xC0000000) |
| |
| /* |
| * This much address space is reserved for vmalloc() and iomap() |
| * as well as fixmap mappings. |
| */ |
| #define __VMALLOC_RESERVE (128 << 20) |
| |
| #ifndef __ASSEMBLY__ |
| |
| /* |
| * Tell the user there is some problem. Beep too, so we can |
| * see^H^H^Hhear bugs in early bootup as well! |
| * The offending file and line are encoded after the "officially |
| * undefined" opcode for parsing in the trap handler. |
| */ |
| |
| #if 1 /* Set to zero for a slightly smaller kernel */ |
| #define BUG() \ |
| __asm__ __volatile__( "ud2\n" \ |
| "\t.word %c0\n" \ |
| "\t.long %c1\n" \ |
| : : "i" (__LINE__), "i" (__FILE__)) |
| #else |
| #define BUG() __asm__ __volatile__("ud2\n") |
| #endif |
| |
| #define PAGE_BUG(page) do { \ |
| BUG(); \ |
| } while (0) |
| |
| /* Pure 2^n version of get_order */ |
| static __inline__ int get_order(unsigned long size) |
| { |
| int order; |
| |
| size = (size-1) >> (PAGE_SHIFT-1); |
| order = -1; |
| do { |
| size >>= 1; |
| order++; |
| } while (size); |
| return order; |
| } |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) |
| #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE) |
| #define __MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE) |
| #define MAXMEM ((unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE)) |
| #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET) |
| #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) |
| #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT)) |
| #define VALID_PAGE(page) ((page - mem_map) < max_mapnr) |
| |
| #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ |
| VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _I386_PAGE_H */ |