| /* |
| * 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, 2003 by Ralf Baechle |
| */ |
| #ifndef __ASM_PAGE_H |
| #define __ASM_PAGE_H |
| |
| #include <linux/config.h> |
| #include <asm/break.h> |
| |
| #ifdef __KERNEL__ |
| |
| /* |
| * PAGE_SHIFT determines the page size |
| */ |
| #ifdef CONFIG_PAGE_SIZE_4KB |
| #define PAGE_SHIFT 12 |
| #endif |
| #ifdef CONFIG_PAGE_SIZE_16KB |
| #define PAGE_SHIFT 14 |
| #endif |
| #ifdef CONFIG_PAGE_SIZE_64KB |
| #define PAGE_SHIFT 16 |
| #endif |
| #define PAGE_SIZE (1L << PAGE_SHIFT) |
| #define PAGE_MASK (~(PAGE_SIZE-1)) |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <asm/cacheflush.h> |
| |
| #define BUG() \ |
| do { \ |
| __asm__ __volatile__("break %0" : : "i" (BRK_BUG)); \ |
| } while (0) |
| |
| #define PAGE_BUG(page) do { BUG(); } while (0) |
| |
| extern void clear_page(void * page); |
| extern void copy_page(void * to, void * from); |
| |
| extern unsigned long shm_align_mask; |
| |
| static inline unsigned long pages_do_alias(unsigned long addr1, |
| unsigned long addr2) |
| { |
| return (addr1 ^ addr2) & shm_align_mask; |
| } |
| |
| static inline void clear_user_page(void *page, unsigned long vaddr) |
| { |
| unsigned long kaddr = (unsigned long) page; |
| |
| clear_page(page); |
| if (pages_do_alias(kaddr, vaddr)) |
| flush_data_cache_page(kaddr); |
| } |
| |
| static inline void copy_user_page(void * to, void * from, unsigned long vaddr) |
| { |
| unsigned long kto = (unsigned long) to; |
| |
| copy_page(to, from); |
| if (pages_do_alias(kto, vaddr)) |
| flush_data_cache_page(kto); |
| } |
| |
| /* |
| * These are used to make use of C type-checking.. |
| */ |
| #ifdef CONFIG_64BIT_PHYS_ADDR |
| #ifdef CONFIG_CPU_MIPS32 |
| typedef struct { unsigned long pte_low, pte_high; } pte_t; |
| #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) |
| #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) |
| #else |
| typedef struct { unsigned long long pte_low; } pte_t; |
| #define pte_val(x) ((x).pte_low) |
| #define __pte(x) ((pte_t) { (x) } ) |
| #endif |
| #else |
| typedef struct { unsigned long pte_low; } pte_t; |
| #define pte_val(x) ((x).pte_low) |
| #define __pte(x) ((pte_t) { (x) } ) |
| #endif |
| |
| typedef struct { unsigned long pmd; } pmd_t; |
| typedef struct { unsigned long pgd; } pgd_t; |
| typedef struct { unsigned long pgprot; } pgprot_t; |
| |
| #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 __pmd(x) ((pmd_t) { (x) } ) |
| #define __pgd(x) ((pgd_t) { (x) } ) |
| #define __pgprot(x) ((pgprot_t) { (x) } ) |
| |
| /* 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 /* !__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 0x20000000UL |
| |
| #endif /* defined (__KERNEL__) */ |
| |
| #endif /* __ASM_PAGE_H */ |