page.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- #ifndef _CRIS_PAGE_H
- #define _CRIS_PAGE_H
- #include <linux/config.h>
- #include <asm/mmu.h>
- /* PAGE_SHIFT determines the page size */
- #define PAGE_SHIFT 13
- #define PAGE_SIZE (1UL << PAGE_SHIFT)
- #define PAGE_MASK (~(PAGE_SIZE-1))
- #ifdef __KERNEL__
- #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
- #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
- #define clear_user_page(page, vaddr) clear_page(page)
- #define copy_user_page(to, from, vaddr) copy_page(to, from)
- #define STRICT_MM_TYPECHECKS
- #ifdef STRICT_MM_TYPECHECKS
- /*
- * 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) } )
- #else
- /*
- * .. while these make it easier on the compiler
- */
- typedef unsigned long pte_t;
- typedef unsigned long pmd_t;
- typedef unsigned long pgd_t;
- typedef unsigned long pgprot_t;
- #define pte_val(x) (x)
- #define pmd_val(x) (x)
- #define pgd_val(x) (x)
- #define pgprot_val(x) (x)
- #define __pte(x) (x)
- #define __pmd(x) (x)
- #define __pgd(x) (x)
- #define __pgprot(x) (x)
- #endif
- /* to align the pointer to the (next) page boundary */
- #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
- /* This handles the memory map.. */
- #ifdef CONFIG_CRIS_LOW_MAP
- #define PAGE_OFFSET KSEG_6 /* kseg_6 is mapped to physical ram */
- #else
- #define PAGE_OFFSET KSEG_C /* kseg_c is mapped to physical ram */
- #endif
- #ifndef __ASSEMBLY__
- #define BUG() do {
- printk("kernel BUG at %s:%d!n", __FILE__, __LINE__);
- } while (0)
- #define PAGE_BUG(page) do {
- BUG();
- } while (0)
- #endif /* __ASSEMBLY__ */
- /* macros to convert between really physical and virtual addresses
- * by stripping a selected bit, we can convert between KSEG_x and 0x40000000 where
- * the DRAM really resides
- */
- #ifdef CONFIG_CRIS_LOW_MAP
- /* we have DRAM virtually at 0x6 */
- #define __pa(x) ((unsigned long)(x) & 0xdfffffff)
- #define __va(x) ((void *)((unsigned long)(x) | 0x20000000))
- #else
- /* we have DRAM virtually at 0xc */
- #define __pa(x) ((unsigned long)(x) & 0x7fffffff)
- #define __va(x) ((void *)((unsigned long)(x) | 0x80000000))
- #endif
- /* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
- * we can let the map start there. notice that we subtract PAGE_OFFSET because
- * we start our mem_map there - in other ports they map mem_map physically and
- * use __pa instead. in our system both the physical and virtual address of DRAM
- * is too high to let mem_map start at 0, so we do it this way instead (similar
- * to arm and m68k I think)
- */
- #define virt_to_page(kaddr) (mem_map + (((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT))
- #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
- /* from linker script */
- extern unsigned long dram_start, dram_end;
- #endif /* __KERNEL__ */
- #endif /* _CRIS_PAGE_H */