/* * 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  #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#elsetypedef 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_SPARSEMEM#ifndef CONFIG_NEED_MULTIPLE_NODES#define pfn_valid(pfn)		((pfn) < max_mapnr)#endif#endif #ifdef CONFIG_FLATMEM #define pfn_valid(pfn)		((pfn) < max_mapnr) #elif defined(CONFIG_NEED_MULTIPLE_NODES) #define pfn_valid(pfn)							\({									\	unsigned long __pfn = (pfn);					\	int __n = pfn_to_nid(__pfn);					\	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\	                       NODE_DATA(__n)->node_spanned_pages)	\	            : 0);						\}) #else#error Provide a definition of pfn_valid#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/memory_model.h>#include <asm-generic/page.h> #endif /* _ASM_PAGE_H */