1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _M68K_PAGE_MM_H 3 #define _M68K_PAGE_MM_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <linux/compiler.h> 8 #include <asm/module.h> 9 10 /* 11 * We don't need to check for alignment etc. 12 */ 13 #ifdef CPU_M68040_OR_M68060_ONLY 14 static inline void copy_page(void *to, void *from) 15 { 16 unsigned long tmp; 17 18 __asm__ __volatile__("1:\t" 19 ".chip 68040\n\t" 20 "move16 %1@+,%0@+\n\t" 21 "move16 %1@+,%0@+\n\t" 22 ".chip 68k\n\t" 23 "dbra %2,1b\n\t" 24 : "=a" (to), "=a" (from), "=d" (tmp) 25 : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1) 26 ); 27 } 28 29 static inline void clear_page(void *page) 30 { 31 unsigned long tmp; 32 unsigned long *sp = page; 33 34 *sp++ = 0; 35 *sp++ = 0; 36 *sp++ = 0; 37 *sp++ = 0; 38 39 __asm__ __volatile__("1:\t" 40 ".chip 68040\n\t" 41 "move16 %2@+,%0@+\n\t" 42 ".chip 68k\n\t" 43 "subqw #8,%2\n\t" 44 "subqw #8,%2\n\t" 45 "dbra %1,1b\n\t" 46 : "=a" (sp), "=d" (tmp) 47 : "a" (page), "0" (sp), 48 "1" ((PAGE_SIZE - 16) / 16 - 1)); 49 } 50 51 #else 52 #define clear_page(page) memset((page), 0, PAGE_SIZE) 53 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) 54 #endif 55 56 #define clear_user_page(addr, vaddr, page) \ 57 do { clear_page(addr); \ 58 flush_dcache_page(page); \ 59 } while (0) 60 #define copy_user_page(to, from, vaddr, page) \ 61 do { copy_page(to, from); \ 62 flush_dcache_page(page); \ 63 } while (0) 64 65 extern unsigned long m68k_memoffset; 66 67 #ifndef CONFIG_SUN3 68 69 #define WANT_PAGE_VIRTUAL 70 71 static inline unsigned long ___pa(void *vaddr) 72 { 73 unsigned long paddr; 74 asm ( 75 "1: addl #0,%0\n" 76 m68k_fixup(%c2, 1b+2) 77 : "=r" (paddr) 78 : "0" (vaddr), "i" (m68k_fixup_memoffset)); 79 return paddr; 80 } 81 #define __pa(vaddr) ___pa((void *)(long)(vaddr)) 82 static inline void *__va(unsigned long paddr) 83 { 84 void *vaddr; 85 asm ( 86 "1: subl #0,%0\n" 87 m68k_fixup(%c2, 1b+2) 88 : "=r" (vaddr) 89 : "0" (paddr), "i" (m68k_fixup_memoffset)); 90 return vaddr; 91 } 92 93 #else /* !CONFIG_SUN3 */ 94 /* This #define is a horrible hack to suppress lots of warnings. --m */ 95 #define __pa(x) ___pa((unsigned long)(x)) 96 static inline unsigned long ___pa(unsigned long x) 97 { 98 if(x == 0) 99 return 0; 100 if(x >= PAGE_OFFSET) 101 return (x-PAGE_OFFSET); 102 else 103 return (x+0x2000000); 104 } 105 106 static inline void *__va(unsigned long x) 107 { 108 if(x == 0) 109 return (void *)0; 110 111 if(x < 0x2000000) 112 return (void *)(x+PAGE_OFFSET); 113 else 114 return (void *)(x-0x2000000); 115 } 116 #endif /* CONFIG_SUN3 */ 117 118 /* 119 * NOTE: virtual isn't really correct, actually it should be the offset into the 120 * memory node, but we have no highmem, so that works for now. 121 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots 122 * of the shifts unnecessary. 123 */ 124 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 125 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 126 127 extern int m68k_virt_to_node_shift; 128 129 #ifdef CONFIG_SINGLE_MEMORY_CHUNK 130 #define __virt_to_node(addr) (&pg_data_map[0]) 131 #else 132 extern struct pglist_data *pg_data_table[]; 133 134 static inline __attribute_const__ int __virt_to_node_shift(void) 135 { 136 int shift; 137 138 asm ( 139 "1: moveq #0,%0\n" 140 m68k_fixup(%c1, 1b) 141 : "=d" (shift) 142 : "i" (m68k_fixup_vnode_shift)); 143 return shift; 144 } 145 146 #define __virt_to_node(addr) (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()]) 147 #endif 148 149 #define virt_to_page(addr) ({ \ 150 pfn_to_page(virt_to_pfn(addr)); \ 151 }) 152 #define page_to_virt(page) ({ \ 153 pfn_to_virt(page_to_pfn(page)); \ 154 }) 155 156 #define pfn_to_page(pfn) ({ \ 157 unsigned long __pfn = (pfn); \ 158 struct pglist_data *pgdat; \ 159 pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn)); \ 160 pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn); \ 161 }) 162 #define page_to_pfn(_page) ({ \ 163 const struct page *__p = (_page); \ 164 struct pglist_data *pgdat; \ 165 pgdat = &pg_data_map[page_to_nid(__p)]; \ 166 ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn; \ 167 }) 168 169 #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) 170 #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) 171 172 #endif /* __ASSEMBLY__ */ 173 174 #endif /* _M68K_PAGE_MM_H */ 175