/* * 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, 2000, 03 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #ifndef _ASM_PAGE_H #define _ASM_PAGE_H #include <linux/config.h> #ifdef __KERNEL__ #include <spaces.h> #endif /* * PAGE_SHIFT determines the page size */ #ifdef CONFIG_PAGE_SIZE_4KB #define PAGE_SHIFT 12 #endif #ifdef CONFIG_PAGE_SIZE_8KB #define PAGE_SHIFT 13 #endif #ifdef CONFIG_PAGE_SIZE_16KB #define PAGE_SHIFT 14 #endif #ifdef CONFIG_PAGE_SIZE_64KB #define PAGE_SHIFT 16 #endif #define PAGE_SIZE (1UL << PAGE_SHIFT) #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) #ifdef __KERNEL__ #ifndef __ASSEMBLY__ 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; } struct page; static inline void clear_user_page(void *addr, unsigned long vaddr, struct page *page) { extern void (*flush_data_cache_page)(unsigned long addr); clear_page(addr); if (pages_do_alias((unsigned long) addr, vaddr)) flush_data_cache_page((unsigned long)addr); } static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *to) { extern void (*flush_data_cache_page)(unsigned long addr); copy_page(vto, vfrom); if (pages_do_alias((unsigned long)vto, vaddr)) flush_data_cache_page((unsigned long)vto); } /* * 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)) #else typedef struct { unsigned long long pte; } pte_t; #define pte_val(x) ((x).pte) #endif #else typedef struct { unsigned long pte; } pte_t; #define pte_val(x) ((x).pte) #endif #define __pte(x) ((pte_t) { (x) } ) /* * For 3-level pagetables we defines these ourselves, for 2-level the * definitions are supplied by <asm-generic/pgtable-nopmd.h>. */ #ifdef CONFIG_64BIT typedef struct { unsigned long pmd; } pmd_t; #define pmd_val(x) ((x).pmd) #define __pmd(x) ((pmd_t) { (x) } ) #endif /* * Right now we don't support 4-level pagetables, so all pud-related * definitions come from <asm-generic/pgtable-nopud.h>. */ /* * Finall the top of the hierarchy, the pgd */ typedef struct { unsigned long pgd; } pgd_t; #define pgd_val(x) ((x).pgd) #define __pgd(x) ((pgd_t) { (x) } ) /* * Manipulate page protection bits */ typedef struct { unsigned long pgprot; } pgprot_t; #define pgprot_val(x) ((x).pgprot) #define __pgprot(x) ((pgprot_t) { (x) } ) /* * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd * pair of pages we only have a single global bit per pair of pages. When * writing to the TLB make sure we always have the bit set for both pages * or none. This macro is used to access the `buddy' of the pte we're just * working on. */ #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) #endif /* !__ASSEMBLY__ */ /* to align the pointer to the (next) page boundary */ #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET)) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) #ifndef CONFIG_NEED_MULTIPLE_NODES #define pfn_to_page(pfn) (mem_map + (pfn)) #define page_to_pfn(page) ((unsigned long)((page) - mem_map)) #define pfn_valid(pfn) ((pfn) < max_mapnr) #endif #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) #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) #endif /* defined (__KERNEL__) */ #ifdef CONFIG_LIMITED_DMA #define WANT_PAGE_VIRTUAL #endif #include <asm-generic/page.h> #endif /* _ASM_PAGE_H */