#ifndef __ASM_GENERIC_PAGE_H#define __ASM_GENERIC_PAGE_H/* * Generic page.h implementation, for NOMMU architectures. * This provides the dummy definitions for the memory management. */ #ifdef CONFIG_MMU#error need to prove a real asm/page.h#endif  /* PAGE_SHIFT determines the page size */ #define PAGE_SHIFT	12#ifdef __ASSEMBLY__#define PAGE_SIZE	(1 << PAGE_SHIFT)#else#define PAGE_SIZE	(1UL << PAGE_SHIFT)#endif#define PAGE_MASK	(~(PAGE_SIZE-1)) #include <asm/setup.h> #ifndef __ASSEMBLY__ #define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)#define free_user_page(page, addr)	free_page(addr) #define clear_page(page)	memset((page), 0, PAGE_SIZE)#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE) #define clear_user_page(page, vaddr, pg)	clear_page(page)#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from) /* * These are used to make use of C type-checking.. */typedef struct {	unsigned long pte;} pte_t;typedef struct {	unsigned long pmd[16];} pmd_t;typedef struct {	unsigned long pgd;} pgd_t;typedef struct {	unsigned long pgprot;} pgprot_t;typedef struct page *pgtable_t; #define pte_val(x)	((x).pte)#define pmd_val(x)	((&x)->pmd[0])#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) } ) extern unsigned long memory_start;extern unsigned long memory_end; #endif /* !__ASSEMBLY__ */ #ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)#else#define PAGE_OFFSET		(0)#endif #ifndef ARCH_PFN_OFFSET#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)#endif #ifndef __ASSEMBLY__ #define __va(x) ((void *)((unsigned long) (x)))#define __pa(x) ((unsigned long) (x)) #define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT) #define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page)) #ifndef page_to_phys#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)#endif #define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) #define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \				((void *)(kaddr) < (void *)memory_end)) #endif /* __ASSEMBLY__ */ #include <asm-generic/memory_model.h>#include <asm-generic/getorder.h> #endif /* __ASM_GENERIC_PAGE_H */