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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _M68K_PAGE_MM_H #define _M68K_PAGE_MM_H #ifndef __ASSEMBLY__ #include <linux/compiler.h> #include <asm/module.h> /* * We don't need to check for alignment etc. */ #ifdef CPU_M68040_OR_M68060_ONLY static inline void copy_page(void *to, void *from) { unsigned long tmp; __asm__ __volatile__("1:\t" ".chip 68040\n\t" "move16 %1@+,%0@+\n\t" "move16 %1@+,%0@+\n\t" ".chip 68k\n\t" "dbra %2,1b\n\t" : "=a" (to), "=a" (from), "=d" (tmp) : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1) ); } static inline void clear_page(void *page) { unsigned long tmp; unsigned long *sp = page; *sp++ = 0; *sp++ = 0; *sp++ = 0; *sp++ = 0; __asm__ __volatile__("1:\t" ".chip 68040\n\t" "move16 %2@+,%0@+\n\t" ".chip 68k\n\t" "subqw #8,%2\n\t" "subqw #8,%2\n\t" "dbra %1,1b\n\t" : "=a" (sp), "=d" (tmp) : "a" (page), "0" (sp), "1" ((PAGE_SIZE - 16) / 16 - 1)); } #else #define clear_page(page) memset((page), 0, PAGE_SIZE) #define copy_page(to,from) memcpy((to), (from), PAGE_SIZE) #endif #define clear_user_page(addr, vaddr, page) \ do { clear_page(addr); \ flush_dcache_page(page); \ } while (0) #define copy_user_page(to, from, vaddr, page) \ do { copy_page(to, from); \ flush_dcache_page(page); \ } while (0) extern unsigned long m68k_memoffset; #ifndef CONFIG_SUN3 #define WANT_PAGE_VIRTUAL static inline unsigned long ___pa(void *vaddr) { unsigned long paddr; asm ( "1: addl #0,%0\n" m68k_fixup(%c2, 1b+2) : "=r" (paddr) : "0" (vaddr), "i" (m68k_fixup_memoffset)); return paddr; } #define __pa(vaddr) ___pa((void *)(long)(vaddr)) static inline void *__va(unsigned long paddr) { void *vaddr; asm ( "1: subl #0,%0\n" m68k_fixup(%c2, 1b+2) : "=r" (vaddr) : "0" (paddr), "i" (m68k_fixup_memoffset)); return vaddr; } #else /* !CONFIG_SUN3 */ /* This #define is a horrible hack to suppress lots of warnings. --m */ #define __pa(x) ___pa((unsigned long)(x)) static inline unsigned long ___pa(unsigned long x) { if(x == 0) return 0; if(x >= PAGE_OFFSET) return (x-PAGE_OFFSET); else return (x+0x2000000); } static inline void *__va(unsigned long x) { if(x == 0) return (void *)0; if(x < 0x2000000) return (void *)(x+PAGE_OFFSET); else return (void *)(x-0x2000000); } #endif /* CONFIG_SUN3 */ /* * NOTE: virtual isn't really correct, actually it should be the offset into the * memory node, but we have no highmem, so that works for now. * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots * of the shifts unnecessary. */ #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) extern int m68k_virt_to_node_shift; #define virt_to_page(addr) ({ \ pfn_to_page(virt_to_pfn(addr)); \ }) #define page_to_virt(page) ({ \ pfn_to_virt(page_to_pfn(page)); \ }) #define ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT) #include <asm-generic/memory_model.h> #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) #define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn)) #endif /* __ASSEMBLY__ */ #endif /* _M68K_PAGE_MM_H */ |