1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/m68k/mm/cache.c 4 * 5 * Instruction cache handling 6 * 7 * Copyright (C) 1995 Hamish Macdonald 8 */ 9 10 #include <linux/module.h> 11 #include <asm/pgalloc.h> 12 #include <asm/traps.h> 13 14 15 static unsigned long virt_to_phys_slow(unsigned long vaddr) 16 { 17 if (CPU_IS_060) { 18 unsigned long paddr; 19 20 /* The PLPAR instruction causes an access error if the translation 21 * is not possible. To catch this we use the same exception mechanism 22 * as for user space accesses in <asm/uaccess.h>. */ 23 asm volatile (".chip 68060\n" 24 "1: plpar (%0)\n" 25 ".chip 68k\n" 26 "2:\n" 27 ".section .fixup,\"ax\"\n" 28 " .even\n" 29 "3: sub.l %0,%0\n" 30 " jra 2b\n" 31 ".previous\n" 32 ".section __ex_table,\"a\"\n" 33 " .align 4\n" 34 " .long 1b,3b\n" 35 ".previous" 36 : "=a" (paddr) 37 : "0" (vaddr)); 38 return paddr; 39 } else if (CPU_IS_040) { 40 unsigned long mmusr; 41 42 asm volatile (".chip 68040\n\t" 43 "ptestr (%1)\n\t" 44 "movec %%mmusr, %0\n\t" 45 ".chip 68k" 46 : "=r" (mmusr) 47 : "a" (vaddr)); 48 49 if (mmusr & MMU_R_040) 50 return (mmusr & PAGE_MASK) | (vaddr & ~PAGE_MASK); 51 } else { 52 unsigned short mmusr; 53 unsigned long *descaddr; 54 55 asm volatile ("ptestr %3,%2@,#7,%0\n\t" 56 "pmove %%psr,%1" 57 : "=a&" (descaddr), "=m" (mmusr) 58 : "a" (vaddr), "d" (get_fs().seg)); 59 if (mmusr & (MMU_I|MMU_B|MMU_L)) 60 return 0; 61 descaddr = phys_to_virt((unsigned long)descaddr); 62 switch (mmusr & MMU_NUM) { 63 case 1: 64 return (*descaddr & 0xfe000000) | (vaddr & 0x01ffffff); 65 case 2: 66 return (*descaddr & 0xfffc0000) | (vaddr & 0x0003ffff); 67 case 3: 68 return (*descaddr & PAGE_MASK) | (vaddr & ~PAGE_MASK); 69 } 70 } 71 return 0; 72 } 73 74 /* Push n pages at kernel virtual address and clear the icache */ 75 /* RZ: use cpush %bc instead of cpush %dc, cinv %ic */ 76 void flush_icache_range(unsigned long address, unsigned long endaddr) 77 { 78 if (CPU_IS_COLDFIRE) { 79 unsigned long start, end; 80 start = address & ICACHE_SET_MASK; 81 end = endaddr & ICACHE_SET_MASK; 82 if (start > end) { 83 flush_cf_icache(0, end); 84 end = ICACHE_MAX_ADDR; 85 } 86 flush_cf_icache(start, end); 87 } else if (CPU_IS_040_OR_060) { 88 address &= PAGE_MASK; 89 90 do { 91 asm volatile ("nop\n\t" 92 ".chip 68040\n\t" 93 "cpushp %%bc,(%0)\n\t" 94 ".chip 68k" 95 : : "a" (virt_to_phys_slow(address))); 96 address += PAGE_SIZE; 97 } while (address < endaddr); 98 } else { 99 unsigned long tmp; 100 asm volatile ("movec %%cacr,%0\n\t" 101 "orw %1,%0\n\t" 102 "movec %0,%%cacr" 103 : "=&d" (tmp) 104 : "di" (FLUSH_I)); 105 } 106 } 107 EXPORT_SYMBOL(flush_icache_range); 108 109 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, 110 unsigned long addr, int len) 111 { 112 if (CPU_IS_COLDFIRE) { 113 unsigned long start, end; 114 start = addr & ICACHE_SET_MASK; 115 end = (addr + len) & ICACHE_SET_MASK; 116 if (start > end) { 117 flush_cf_icache(0, end); 118 end = ICACHE_MAX_ADDR; 119 } 120 flush_cf_icache(start, end); 121 122 } else if (CPU_IS_040_OR_060) { 123 asm volatile ("nop\n\t" 124 ".chip 68040\n\t" 125 "cpushp %%bc,(%0)\n\t" 126 ".chip 68k" 127 : : "a" (page_to_phys(page))); 128 } else { 129 unsigned long tmp; 130 asm volatile ("movec %%cacr,%0\n\t" 131 "orw %1,%0\n\t" 132 "movec %0,%%cacr" 133 : "=&d" (tmp) 134 : "di" (FLUSH_I)); 135 } 136 } 137 138