1 #ifndef _M68K_PAGE_MM_H 2 #define _M68K_PAGE_MM_H 3 4 #ifndef __ASSEMBLY__ 5 6 #include <linux/compiler.h> 7 #include <asm/module.h> 8 9 #define get_user_page(vaddr) __get_free_page(GFP_KERNEL) 10 #define free_user_page(page, addr) free_page(addr) 11 12 /* 13 * We don't need to check for alignment etc. 14 */ 15 #ifdef CPU_M68040_OR_M68060_ONLY 16 static inline void copy_page(void *to, void *from) 17 { 18 unsigned long tmp; 19 20 __asm__ __volatile__("1:\t" 21 ".chip 68040\n\t" 22 "move16 %1@+,%0@+\n\t" 23 "move16 %1@+,%0@+\n\t" 24 ".chip 68k\n\t" 25 "dbra %2,1b\n\t" 26 : "=a" (to), "=a" (from), "=d" (tmp) 27 : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1) 28 ); 29 } 30 31 static inline void clear_page(void *page) 32 { 33 unsigned long tmp; 34 unsigned long *sp = page; 35 36 *sp++ = 0; 37 *sp++ = 0; 38 *sp++ = 0; 39 *sp++ = 0; 40 41 __asm__ __volatile__("1:\t" 42 ".chip 68040\n\t" 43 "move16 %2@+,%0@+\n\t" 44 ".chip 68k\n\t" 45 "subqw #8,%2\n\t" 46 "subqw #8,%2\n\t" 47 "dbra %1,1b\n\t" 48 : "=a" (sp), "=d" (tmp) 49 : "a" (page), "0" (sp), 50 "1" ((PAGE_SIZE - 16) / 16 - 1)); 51 } 52 53 #else 54 #define clear_page(page) memset((page), 0, PAGE_SIZE) 55 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) 56 #endif 57 58 #define clear_user_page(addr, vaddr, page) \ 59 do { clear_page(addr); \ 60 flush_dcache_page(page); \ 61 } while (0) 62 #define copy_user_page(to, from, vaddr, page) \ 63 do { copy_page(to, from); \ 64 flush_dcache_page(page); \ 65 } while (0) 66 67 extern unsigned long m68k_memoffset; 68 69 #ifndef CONFIG_SUN3 70 71 #define WANT_PAGE_VIRTUAL 72 73 static inline unsigned long ___pa(void *vaddr) 74 { 75 unsigned long paddr; 76 asm ( 77 "1: addl #0,%0\n" 78 m68k_fixup(%c2, 1b+2) 79 : "=r" (paddr) 80 : "0" (vaddr), "i" (m68k_fixup_memoffset)); 81 return paddr; 82 } 83 #define __pa(vaddr) ___pa((void *)(long)(vaddr)) 84 static inline void *__va(unsigned long paddr) 85 { 86 void *vaddr; 87 asm ( 88 "1: subl #0,%0\n" 89 m68k_fixup(%c2, 1b+2) 90 : "=r" (vaddr) 91 : "0" (paddr), "i" (m68k_fixup_memoffset)); 92 return vaddr; 93 } 94 95 #else /* !CONFIG_SUN3 */ 96 /* This #define is a horrible hack to suppress lots of warnings. --m */ 97 #define __pa(x) ___pa((unsigned long)(x)) 98 static inline unsigned long ___pa(unsigned long x) 99 { 100 if(x == 0) 101 return 0; 102 if(x >= PAGE_OFFSET) 103 return (x-PAGE_OFFSET); 104 else 105 return (x+0x2000000); 106 } 107 108 static inline void *__va(unsigned long x) 109 { 110 if(x == 0) 111 return (void *)0; 112 113 if(x < 0x2000000) 114 return (void *)(x+PAGE_OFFSET); 115 else 116 return (void *)(x-0x2000000); 117 } 118 #endif /* CONFIG_SUN3 */ 119 120 /* 121 * NOTE: virtual isn't really correct, actually it should be the offset into the 122 * memory node, but we have no highmem, so that works for now. 123 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots 124 * of the shifts unnecessary. 125 */ 126 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 127 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 128 129 extern int m68k_virt_to_node_shift; 130 131 #ifdef CONFIG_SINGLE_MEMORY_CHUNK 132 #define __virt_to_node(addr) (&pg_data_map[0]) 133 #else 134 extern struct pglist_data *pg_data_table[]; 135 136 static inline __attribute_const__ int __virt_to_node_shift(void) 137 { 138 int shift; 139 140 asm ( 141 "1: moveq #0,%0\n" 142 m68k_fixup(%c1, 1b) 143 : "=d" (shift) 144 : "i" (m68k_fixup_vnode_shift)); 145 return shift; 146 } 147 148 #define __virt_to_node(addr) (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()]) 149 #endif 150 151 #define virt_to_page(addr) ({ \ 152 pfn_to_page(virt_to_pfn(addr)); \ 153 }) 154 #define page_to_virt(page) ({ \ 155 pfn_to_virt(page_to_pfn(page)); \ 156 }) 157 158 #define pfn_to_page(pfn) ({ \ 159 unsigned long __pfn = (pfn); \ 160 struct pglist_data *pgdat; \ 161 pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn)); \ 162 pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn); \ 163 }) 164 #define page_to_pfn(_page) ({ \ 165 const struct page *__p = (_page); \ 166 struct pglist_data *pgdat; \ 167 pgdat = &pg_data_map[page_to_nid(__p)]; \ 168 ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn; \ 169 }) 170 171 #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) 172 #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) 173 174 #endif /* __ASSEMBLY__ */ 175 176 #endif /* _M68K_PAGE_MM_H */ 177