1 #ifndef __ASM_GENERIC_PAGE_H 2 #define __ASM_GENERIC_PAGE_H 3 /* 4 * Generic page.h implementation, for NOMMU architectures. 5 * This provides the dummy definitions for the memory management. 6 */ 7 8 #ifdef CONFIG_MMU 9 #error need to prove a real asm/page.h 10 #endif 11 12 13 /* PAGE_SHIFT determines the page size */ 14 15 #define PAGE_SHIFT 12 16 #ifdef __ASSEMBLY__ 17 #define PAGE_SIZE (1 << PAGE_SHIFT) 18 #else 19 #define PAGE_SIZE (1UL << PAGE_SHIFT) 20 #endif 21 #define PAGE_MASK (~(PAGE_SIZE-1)) 22 23 #include <asm/setup.h> 24 25 #ifndef __ASSEMBLY__ 26 27 #define get_user_page(vaddr) __get_free_page(GFP_KERNEL) 28 #define free_user_page(page, addr) free_page(addr) 29 30 #define clear_page(page) memset((page), 0, PAGE_SIZE) 31 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) 32 33 #define clear_user_page(page, vaddr, pg) clear_page(page) 34 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 35 36 /* 37 * These are used to make use of C type-checking.. 38 */ 39 typedef struct { 40 unsigned long pte; 41 } pte_t; 42 typedef struct { 43 unsigned long pmd[16]; 44 } pmd_t; 45 typedef struct { 46 unsigned long pgd; 47 } pgd_t; 48 typedef struct { 49 unsigned long pgprot; 50 } pgprot_t; 51 typedef struct page *pgtable_t; 52 53 #define pte_val(x) ((x).pte) 54 #define pmd_val(x) ((&x)->pmd[0]) 55 #define pgd_val(x) ((x).pgd) 56 #define pgprot_val(x) ((x).pgprot) 57 58 #define __pte(x) ((pte_t) { (x) } ) 59 #define __pmd(x) ((pmd_t) { (x) } ) 60 #define __pgd(x) ((pgd_t) { (x) } ) 61 #define __pgprot(x) ((pgprot_t) { (x) } ) 62 63 extern unsigned long memory_start; 64 extern unsigned long memory_end; 65 66 #endif /* !__ASSEMBLY__ */ 67 68 #ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS 69 #define PAGE_OFFSET (CONFIG_KERNEL_RAM_BASE_ADDRESS) 70 #else 71 #define PAGE_OFFSET (0) 72 #endif 73 74 #ifndef ARCH_PFN_OFFSET 75 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 76 #endif 77 78 #ifndef __ASSEMBLY__ 79 80 #define __va(x) ((void *)((unsigned long) (x))) 81 #define __pa(x) ((unsigned long) (x)) 82 83 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 84 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 85 86 #define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) 87 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 88 89 #ifndef page_to_phys 90 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) 91 #endif 92 93 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) 94 95 #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ 96 ((void *)(kaddr) < (void *)memory_end)) 97 98 #endif /* __ASSEMBLY__ */ 99 100 #include <asm-generic/memory_model.h> 101 #include <asm-generic/getorder.h> 102 103 #endif /* __ASM_GENERIC_PAGE_H */ 104