page.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:4k
- #ifndef _M68K_PAGE_H
- #define _M68K_PAGE_H
- #include <linux/config.h>
- /* PAGE_SHIFT determines the page size */
- #ifndef CONFIG_SUN3
- #define PAGE_SHIFT (12)
- #define PAGE_SIZE (4096)
- #else
- #define PAGE_SHIFT (13)
- #define PAGE_SIZE (8192)
- #endif
- #define PAGE_MASK (~(PAGE_SIZE-1))
- #ifdef __KERNEL__
- #include <asm/setup.h>
- #if PAGE_SHIFT < 13
- #define KTHREAD_SIZE (8192)
- #else
- #define KTHREAD_SIZE PAGE_SIZE
- #endif
-
- #ifndef __ASSEMBLY__
-
- #define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
- #define free_user_page(page, addr) free_page(addr)
- /*
- * We don't need to check for alignment etc.
- */
- #ifdef CPU_M68040_OR_M68060_ONLY
- static inline void copy_page(void *to, void *from)
- {
- unsigned long tmp;
- __asm__ __volatile__("1:t"
- ".chip 68040nt"
- "move16 %1@+,%0@+nt"
- "move16 %1@+,%0@+nt"
- ".chip 68knt"
- "dbra %2,1bnt"
- : "=a" (to), "=a" (from), "=d" (tmp)
- : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
- );
- }
- static inline void clear_page(void *page)
- {
- unsigned long data, tmp;
- void *sp = page;
- data = 0;
- *((unsigned long *)(page))++ = 0;
- *((unsigned long *)(page))++ = 0;
- *((unsigned long *)(page))++ = 0;
- *((unsigned long *)(page))++ = 0;
- __asm__ __volatile__("1:t"
- ".chip 68040nt"
- "move16 %2@+,%0@+nt"
- ".chip 68knt"
- "subqw #8,%2nt"
- "subqw #8,%2nt"
- "dbra %1,1bnt"
- : "=a" (page), "=d" (tmp)
- : "a" (sp), "0" (page),
- "1" ((PAGE_SIZE - 16) / 16 - 1));
- }
- #else
- #define clear_page(page) memset((page), 0, PAGE_SIZE)
- #define copy_page(to,from) memcpy((to), (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..
- */
- typedef struct { unsigned long pte; } pte_t;
- typedef struct { unsigned long pmd[16]; } 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[0])
- #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) } )
- /* to align the pointer to the (next) page boundary */
- #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
- /* Pure 2^n version of get_order */
- extern __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__ */
- #include <asm/page_offset.h>
- #define PAGE_OFFSET (PAGE_OFFSET_RAW)
- #ifndef __ASSEMBLY__
- #ifndef CONFIG_SUN3
- #ifdef CONFIG_SINGLE_MEMORY_CHUNK
- extern unsigned long m68k_memoffset;
- #define __pa(vaddr) ((unsigned long)(vaddr)+m68k_memoffset)
- #define __va(paddr) ((void *)((unsigned long)(paddr)-m68k_memoffset))
- #else
- #define __pa(vaddr) virt_to_phys((void *)vaddr)
- #define __va(paddr) phys_to_virt((unsigned long)paddr)
- #endif
- #else /* !CONFIG_SUN3 */
- /* This #define is a horrible hack to suppress lots of warnings. --m */
- #define __pa(x) ___pa((unsigned long)x)
- static inline unsigned long ___pa(unsigned long x)
- {
- if(x == 0)
- return 0;
- if(x > PAGE_OFFSET)
- return (x-PAGE_OFFSET);
- else
- return (x+0x2000000);
- }
- static inline void *__va(unsigned long x)
- {
- if(x == 0)
- return (void *)0;
- if(x < 0x2000000)
- return (void *)(x+PAGE_OFFSET);
- else
- return (void *)(x-0x2000000);
- }
- #endif /* CONFIG_SUN3 */
- #define MAP_NR(addr) (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
- #define virt_to_page(kaddr) (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))
- #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
- #ifndef CONFIG_SUN3
- #define BUG() do {
- printk("kernel BUG at %s:%d!n", __FILE__, __LINE__);
- asm volatile("illegal");
- } while (0)
- #else
- #define BUG() do {
- printk("kernel BUG at %s:%d!n", __FILE__, __LINE__);
- panic("BUG!");
- } while (0)
- #endif
- #define PAGE_BUG(page) do {
- BUG();
- } while (0)
- #endif /* __ASSEMBLY__ */
- #endif /* __KERNEL__ */
- #endif /* _M68K_PAGE_H */