page.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * BK Id: SCCS/s.page.h 1.8 08/19/01 20:06:47 paulus
- */
- #ifndef _PPC_PAGE_H
- #define _PPC_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__
- #include <linux/config.h>
- /* Be sure to change arch/ppc/Makefile to match */
- #define PAGE_OFFSET 0xc0000000
- #define KERNELBASE PAGE_OFFSET
- #ifndef __ASSEMBLY__
- #include <asm/system.h> /* for xmon definition */
- #ifdef CONFIG_XMON
- #define BUG() do {
- printk("kernel BUG at %s:%d!n", __FILE__, __LINE__);
- xmon(0);
- } while (0)
- #else
- #define BUG() do {
- printk("kernel BUG at %s:%d!n", __FILE__, __LINE__);
- __asm__ __volatile__(".long 0x0");
- } while (0)
- #endif
- #define PAGE_BUG(page) do { BUG(); } while (0)
- #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
- /* align addr on a size boundry - adjust address up if needed -- Cort */
- #define _ALIGN(addr,size) (((addr)+size-1)&(~(size-1)))
- /* to align the pointer to the (next) page boundary */
- #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
- extern void clear_page(void *page);
- extern void copy_page(void *to, void *from);
- #define clear_user_page(page, vaddr) clear_page(page)
- #define copy_user_page(to, from, vaddr) copy_page(to, from)
- /* map phys->virtual and virtual->phys for RAM pages */
- static inline unsigned long ___pa(unsigned long v)
- {
- unsigned long p;
- asm volatile ("1: addis %0, %1, %2;"
- ".section ".vtop_fixup","aw";"
- ".align 1;"
- ".long 1b;"
- ".previous;"
- : "=r" (p)
- : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
- return p;
- }
- static inline void* ___va(unsigned long p)
- {
- unsigned long v;
- asm volatile ("1: addis %0, %1, %2;"
- ".section ".ptov_fixup","aw";"
- ".align 1;"
- ".long 1b;"
- ".previous;"
- : "=r" (v)
- : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
- return (void*) v;
- }
- #define __pa(x) ___pa ((unsigned long)(x))
- #define __va(x) ___va ((unsigned long)(x))
- #define MAP_PAGE_RESERVED (1<<15)
- #define virt_to_page(kaddr) (mem_map + (((unsigned long)kaddr-PAGE_OFFSET) >> PAGE_SHIFT))
- #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
- extern unsigned long get_zero_page_fast(void);
- /* 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__ */
- #endif /* __KERNEL__ */
- #endif /* _PPC_PAGE_H */