page.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:3k
- #ifndef __ASM_SH_PAGE_H
- #define __ASM_SH_PAGE_H
- /*
- * Copyright (C) 1999 Niibe Yutaka
- */
- /*
- [ P0/U0 (virtual) ] 0x00000000 <------ User space
- [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
- [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
- [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
- [ P4 control ] 0xE0000000
- */
- #include <linux/config.h>
- /* PAGE_SHIFT determines the page size */
- #define PAGE_SHIFT 12
- #define PAGE_SIZE (1UL << PAGE_SHIFT)
- #define PAGE_MASK (~(PAGE_SIZE-1))
- #define PTE_MASK PAGE_MASK
- #ifdef __KERNEL__
- #ifndef __ASSEMBLY__
- extern void clear_page(void *to);
- extern void copy_page(void *to, void *from);
- #if defined(__sh3__)
- #define clear_user_page(page, vaddr) clear_page(page)
- #define copy_user_page(to, from, vaddr) copy_page(to, from)
- #elif defined(__SH4__)
- extern void clear_user_page(void *to, unsigned long address);
- extern void copy_user_page(void *to, void *from, unsigned long address);
- extern void __clear_user_page(void *to, void *orig_to);
- extern void __copy_user_page(void *to, void *from, void *orig_to);
- #endif
- /*
- * These are used to make use of C type-checking..
- */
- typedef struct { unsigned long pte; } pte_t;
- typedef struct { unsigned long pmd; } pmd_t;
- typedef struct { unsigned long pgd; } pgd_t;
- typedef struct { unsigned long pgprot; } pgprot_t;
- #define pte_val(x) ((x).pte)
- #define pmd_val(x) ((x).pmd)
- #define pgd_val(x) ((x).pgd)
- #define pgprot_val(x) ((x).pgprot)
- #define __pte(x) ((pte_t) { (x) } )
- #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)
- /*
- * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
- *
- * arch/sh/vmlinux.lds.S
- *
- * which has the same constant encoded..
- */
- #define __MEMORY_START CONFIG_MEMORY_START
- #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
- #ifdef CONFIG_DISCONTIGMEM
- /* Just for HP690, for now.. */
- #define __MEMORY_START_2ND (__MEMORY_START+0x02000000)
- #define __MEMORY_SIZE_2ND 0x001000000 /* 16MB */
- #endif
- #define PAGE_OFFSET (0x80000000UL)
- #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
- #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
- #ifndef CONFIG_DISCONTIGMEM
- #define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
- #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
- #define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
- #endif
- #define virt_to_page(kaddr) phys_to_page(__pa(kaddr))
- #ifndef __ASSEMBLY__
- /*
- * Tell the user there is some problem.
- */
- #define BUG() do {
- printk("kernel BUG at %s:%d!n", __FILE__, __LINE__);
- asm volatile("nop");
- } while (0)
- #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
- #endif /* __KERNEL__ */
- #endif /* __ASM_SH_PAGE_H */