page.h
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上传日期:2013-04-10
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文件大小:4k
- /*
- * Definitions for page handling
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1994 - 1999 by Ralf Baechle
- */
- #ifndef __ASM_PAGE_H
- #define __ASM_PAGE_H
- #include <linux/config.h>
- /* PAGE_SHIFT determines the page size */
- #define PAGE_SHIFT 12
- #define PAGE_SIZE (1L << PAGE_SHIFT)
- #define PAGE_MASK (~(PAGE_SIZE-1))
- #ifdef __KERNEL__
- #ifndef __ASSEMBLY__
- #define BUG() do { printk("kernel BUG at %s:%d!n", __FILE__, __LINE__); *(int *)0=0; } while (0)
- #define PAGE_BUG(page) do { BUG(); } while (0)
- /*
- * Prototypes for clear_page / copy_page variants with processor dependant
- * optimizations.
- */
- void andes_clear_page(void * page);
- void mips32_clear_page_dc(unsigned long page);
- void mips32_clear_page_sc(unsigned long page);
- void r3k_clear_page(void * page);
- void r4k_clear_page_d16(void * page);
- void r4k_clear_page_d32(void * page);
- void r4k_clear_page_r4600_v1(void * page);
- void r4k_clear_page_r4600_v2(void * page);
- void r4k_clear_page_s16(void * page);
- void r4k_clear_page_s32(void * page);
- void r4k_clear_page_s64(void * page);
- void r4k_clear_page_s128(void * page);
- void r5432_clear_page_d32(void * page);
- void rm7k_clear_page(void * page);
- void sb1_clear_page(void * page);
- void andes_copy_page(void * to, void * from);
- void mips32_copy_page_dc(unsigned long to, unsigned long from);
- void mips32_copy_page_sc(unsigned long to, unsigned long from);
- void r3k_copy_page(void * to, void * from);
- void r4k_copy_page_d16(void * to, void * from);
- void r4k_copy_page_d32(void * to, void * from);
- void r4k_copy_page_r4600_v1(void * to, void * from);
- void r4k_copy_page_r4600_v2(void * to, void * from);
- void r4k_copy_page_s16(void * to, void * from);
- void r4k_copy_page_s32(void * to, void * from);
- void r4k_copy_page_s64(void * to, void * from);
- void r4k_copy_page_s128(void * to, void * from);
- void r5432_copy_page_d32(void * to, void * from);
- void rm7k_copy_page(void * to, void * from);
- void sb1_copy_page(void * to, void * from);
- extern void (*_clear_page)(void * page);
- extern void (*_copy_page)(void * to, void * from);
- #define clear_page(page) _clear_page(page)
- #define copy_page(to, from) _copy_page(to, from)
- #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..
- */
- #ifdef CONFIG_64BIT_PHYS_ADDR
- typedef struct { unsigned long long pte; } pte_t;
- #else
- typedef struct { unsigned long pte; } pte_t;
- #endif
- 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 ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
- #define __pte(x) ((pte_t) { (x) } )
- #define __pmd(x) ((pmd_t) { (x) } )
- #define __pgd(x) ((pgd_t) { (x) } )
- #define __pgprot(x) ((pgprot_t) { (x) } )
- /* 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__ */
- /* 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 handle pages at KSEG0 for kernels with 32 bit address space.
- */
- #define PAGE_OFFSET 0x80000000UL
- #define UNCAC_BASE 0xa0000000UL
- #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)
- #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
- #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
- /*
- * Memory above this physical address will be considered highmem.
- */
- #define HIGHMEM_START (0x20000000)
- #endif /* defined (__KERNEL__) */
- #endif /* __ASM_PAGE_H */