#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 #ifndef __ASSEMBLY__ #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 #include #endif /* __ASM_GENERIC_PAGE_H */

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