1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _M68K_PAGE_MM_H 3 #define _M68K_PAGE_MM_H 4 5 #ifndef __ASSEMBLER__ 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 static inline void clear_page(void *page) 29 { 30 unsigned long tmp; 31 unsigned long *sp = page; 32 33 *sp++ = 0; 34 *sp++ = 0; 35 *sp++ = 0; 36 *sp++ = 0; 37 38 __asm__ __volatile__("1:\t" 39 ".chip 68040\n\t" 40 "move16 %2@+,%0@+\n\t" 41 ".chip 68k\n\t" 42 "subqw #8,%2\n\t" 43 "subqw #8,%2\n\t" 44 "dbra %1,1b\n\t" 45 : "=a" (sp), "=d" (tmp) 46 : "a" (page), "0" (sp), 47 "1" ((PAGE_SIZE - 16) / 16 - 1)); 48 } 49 50 #else 51 #define clear_page(page) memset((page), 0, PAGE_SIZE) 52 #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) 53 #endif 54 55 #define clear_user_page(addr, vaddr, page) \ 56 do { clear_page(addr); \ 57 flush_dcache_page(page); \ 58 (void)(vaddr); \ 59 } while (0) 60 #define copy_user_page(to, from, vaddr, page) \ 61 do { copy_page(to, from); \ 62 flush_dcache_page(page); \ 63 (void)(vaddr); \ 64 } while (0) 65 66 extern unsigned long m68k_memoffset; 67 68 #ifndef CONFIG_SUN3 69 70 #define WANT_PAGE_VIRTUAL 71 72 static inline unsigned long ___pa(void *vaddr) 73 { 74 unsigned long paddr; 75 asm ( 76 "1: addl #0,%0\n" 77 m68k_fixup(%c2, 1b+2) 78 : "=r" (paddr) 79 : "0" (vaddr), "i" (m68k_fixup_memoffset)); 80 return paddr; 81 } 82 #define __pa(vaddr) ___pa((void *)(long)(vaddr)) 83 static inline void *__va(unsigned long paddr) 84 { 85 void *vaddr; 86 asm ( 87 "1: subl #0,%0\n" 88 m68k_fixup(%c2, 1b+2) 89 : "=r" (vaddr) 90 : "0" (paddr), "i" (m68k_fixup_memoffset)); 91 return vaddr; 92 } 93 94 #else /* !CONFIG_SUN3 */ 95 /* This #define is a horrible hack to suppress lots of warnings. --m */ 96 #define __pa(x) ___pa((unsigned long)(x)) 97 static inline unsigned long ___pa(unsigned long x) 98 { 99 if (x == 0) 100 return 0; 101 if (x >= PAGE_OFFSET) 102 return (x - PAGE_OFFSET); 103 else 104 return (x + 0x2000000); 105 } 106 107 static inline void *__va(unsigned long x) 108 { 109 if (x == 0) 110 return (void *)0; 111 112 if (x < 0x2000000) 113 return (void *)(x + PAGE_OFFSET); 114 else 115 return (void *)(x - 0x2000000); 116 } 117 #endif /* CONFIG_SUN3 */ 118 119 /* 120 * NOTE: virtual isn't really correct, actually it should be the offset into the 121 * memory node, but we have no highmem, so that works for now. 122 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots 123 * of the shifts unnecessary. 124 */ 125 static inline unsigned long virt_to_pfn(const void *kaddr) 126 { 127 return __pa(kaddr) >> PAGE_SHIFT; 128 } 129 130 static inline void *pfn_to_virt(unsigned long pfn) 131 { 132 return __va(pfn << PAGE_SHIFT); 133 } 134 135 extern int m68k_virt_to_node_shift; 136 137 #define virt_to_page(addr) ({ \ 138 pfn_to_page(virt_to_pfn(addr)); \ 139 }) 140 #define page_to_virt(page) ({ \ 141 pfn_to_virt(page_to_pfn(page)); \ 142 }) 143 144 #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT) 145 146 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) 147 #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) 148 149 #endif /* __ASSEMBLER__ */ 150 151 #endif /* _M68K_PAGE_MM_H */ 152