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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | #ifndef _CRIS_PAGE_H #define _CRIS_PAGE_H #include <linux/config.h> #include <asm/mmu.h> /* PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 13 #define PAGE_SIZE (1UL << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #ifdef __KERNEL__ #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) #define clear_user_page(page, vaddr) clear_page(page) #define copy_user_page(to, from, vaddr) copy_page(to, from) #define STRICT_MM_TYPECHECKS #ifdef STRICT_MM_TYPECHECKS /* * These are used to make use of C type-checking.. */ typedef struct { unsigned long pte; } pte_t; typedef struct { unsigned long pmd; } pmd_t; typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long pgprot; } pgprot_t; #define pte_val(x) ((x).pte) #define pmd_val(x) ((x).pmd) #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) } ) #else /* * .. while these make it easier on the compiler */ typedef unsigned long pte_t; typedef unsigned long pmd_t; typedef unsigned long pgd_t; typedef unsigned long pgprot_t; #define pte_val(x) (x) #define pmd_val(x) (x) #define pgd_val(x) (x) #define pgprot_val(x) (x) #define __pte(x) (x) #define __pmd(x) (x) #define __pgd(x) (x) #define __pgprot(x) (x) #endif /* to align the pointer to the (next) page boundary */ #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) /* This handles the memory map.. */ #ifdef CONFIG_CRIS_LOW_MAP #define PAGE_OFFSET KSEG_6 /* kseg_6 is mapped to physical ram */ #else #define PAGE_OFFSET KSEG_C /* kseg_c is mapped to physical ram */ #endif #ifndef __ASSEMBLY__ #define BUG() do { \ printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \ } while (0) #define PAGE_BUG(page) do { \ BUG(); \ } while (0) #endif /* __ASSEMBLY__ */ /* macros to convert between really physical and virtual addresses * by stripping a selected bit, we can convert between KSEG_x and 0x40000000 where * the DRAM really resides */ #ifdef CONFIG_CRIS_LOW_MAP /* we have DRAM virtually at 0x6 */ #define __pa(x) ((unsigned long)(x) & 0xdfffffff) #define __va(x) ((void *)((unsigned long)(x) | 0x20000000)) #else /* we have DRAM virtually at 0xc */ #define __pa(x) ((unsigned long)(x) & 0x7fffffff) #define __va(x) ((void *)((unsigned long)(x) | 0x80000000)) #endif /* to index into the page map. our pages all start at physical addr PAGE_OFFSET so * we can let the map start there. notice that we subtract PAGE_OFFSET because * we start our mem_map there - in other ports they map mem_map physically and * use __pa instead. in our system both the physical and virtual address of DRAM * is too high to let mem_map start at 0, so we do it this way instead (similar * to arm and m68k I think) */ #define virt_to_page(kaddr) (mem_map + (((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT)) #define VALID_PAGE(page) ((page - mem_map) < max_mapnr) /* from linker script */ extern unsigned long dram_start, dram_end; #endif /* __KERNEL__ */ #endif /* _CRIS_PAGE_H */ |