1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Cache maintenance 4 * 5 * Copyright (C) 2001 Deep Blue Solutions Ltd. 6 * Copyright (C) 2012 ARM Ltd. 7 */ 8 9 #include <linux/errno.h> 10 #include <linux/linkage.h> 11 #include <linux/init.h> 12 #include <asm/assembler.h> 13 #include <asm/cpufeature.h> 14 #include <asm/alternative.h> 15 #include <asm/asm-uaccess.h> 16 17 /* 18 * caches_clean_inval_pou_macro(start,end) [fixup] 19 * 20 * Ensure that the I and D caches are coherent within specified region. 21 * This is typically used when code has been written to a memory region, 22 * and will be executed. 23 * 24 * - start - virtual start address of region 25 * - end - virtual end address of region 26 * - fixup - optional label to branch to on user fault 27 */ 28 .macro caches_clean_inval_pou_macro, fixup 29 alternative_if ARM64_HAS_CACHE_IDC 30 dsb ishst 31 b .Ldc_skip_\@ 32 alternative_else_nop_endif 33 mov x2, x0 34 mov x3, x1 35 dcache_by_line_op cvau, ish, x2, x3, x4, x5, \fixup 36 .Ldc_skip_\@: 37 alternative_if ARM64_HAS_CACHE_DIC 38 isb 39 b .Lic_skip_\@ 40 alternative_else_nop_endif 41 invalidate_icache_by_line x0, x1, x2, x3, \fixup 42 .Lic_skip_\@: 43 .endm 44 45 /* 46 * caches_clean_inval_pou(start,end) 47 * 48 * Ensure that the I and D caches are coherent within specified region. 49 * This is typically used when code has been written to a memory region, 50 * and will be executed. 51 * 52 * - start - virtual start address of region 53 * - end - virtual end address of region 54 */ 55 SYM_FUNC_START(caches_clean_inval_pou) 56 caches_clean_inval_pou_macro 57 ret 58 SYM_FUNC_END(caches_clean_inval_pou) 59 SYM_FUNC_ALIAS(__pi_caches_clean_inval_pou, caches_clean_inval_pou) 60 61 /* 62 * caches_clean_inval_user_pou(start,end) 63 * 64 * Ensure that the I and D caches are coherent within specified region. 65 * This is typically used when code has been written to a memory region, 66 * and will be executed. 67 * 68 * - start - virtual start address of region 69 * - end - virtual end address of region 70 */ 71 SYM_FUNC_START(caches_clean_inval_user_pou) 72 uaccess_ttbr0_enable x2, x3, x4 73 74 caches_clean_inval_pou_macro 2f 75 mov x0, xzr 76 1: 77 uaccess_ttbr0_disable x1, x2 78 ret 79 2: 80 mov x0, #-EFAULT 81 b 1b 82 SYM_FUNC_END(caches_clean_inval_user_pou) 83 84 /* 85 * icache_inval_pou(start,end) 86 * 87 * Ensure that the I cache is invalid within specified region. 88 * 89 * - start - virtual start address of region 90 * - end - virtual end address of region 91 */ 92 SYM_FUNC_START(icache_inval_pou) 93 alternative_if ARM64_HAS_CACHE_DIC 94 isb 95 ret 96 alternative_else_nop_endif 97 98 invalidate_icache_by_line x0, x1, x2, x3 99 ret 100 SYM_FUNC_END(icache_inval_pou) 101 102 /* 103 * dcache_clean_inval_poc(start, end) 104 * 105 * Ensure that any D-cache lines for the interval [start, end) 106 * are cleaned and invalidated to the PoC. 107 * 108 * - start - virtual start address of region 109 * - end - virtual end address of region 110 */ 111 SYM_FUNC_START(__pi_dcache_clean_inval_poc) 112 dcache_by_line_op civac, sy, x0, x1, x2, x3 113 ret 114 SYM_FUNC_END(__pi_dcache_clean_inval_poc) 115 SYM_FUNC_ALIAS(dcache_clean_inval_poc, __pi_dcache_clean_inval_poc) 116 117 /* 118 * dcache_clean_pou(start, end) 119 * 120 * Ensure that any D-cache lines for the interval [start, end) 121 * are cleaned to the PoU. 122 * 123 * - start - virtual start address of region 124 * - end - virtual end address of region 125 */ 126 SYM_FUNC_START(dcache_clean_pou) 127 alternative_if ARM64_HAS_CACHE_IDC 128 dsb ishst 129 ret 130 alternative_else_nop_endif 131 dcache_by_line_op cvau, ish, x0, x1, x2, x3 132 ret 133 SYM_FUNC_END(dcache_clean_pou) 134 135 /* 136 * dcache_inval_poc(start, end) 137 * 138 * Ensure that any D-cache lines for the interval [start, end) 139 * are invalidated. Any partial lines at the ends of the interval are 140 * also cleaned to PoC to prevent data loss. 141 * 142 * - start - kernel start address of region 143 * - end - kernel end address of region 144 */ 145 SYM_FUNC_START(__pi_dcache_inval_poc) 146 dcache_line_size x2, x3 147 sub x3, x2, #1 148 tst x1, x3 // end cache line aligned? 149 bic x1, x1, x3 150 b.eq 1f 151 dc civac, x1 // clean & invalidate D / U line 152 1: tst x0, x3 // start cache line aligned? 153 bic x0, x0, x3 154 b.eq 2f 155 dc civac, x0 // clean & invalidate D / U line 156 b 3f 157 2: dc ivac, x0 // invalidate D / U line 158 3: add x0, x0, x2 159 cmp x0, x1 160 b.lo 2b 161 dsb sy 162 ret 163 SYM_FUNC_END(__pi_dcache_inval_poc) 164 SYM_FUNC_ALIAS(dcache_inval_poc, __pi_dcache_inval_poc) 165 166 /* 167 * dcache_clean_poc(start, end) 168 * 169 * Ensure that any D-cache lines for the interval [start, end) 170 * are cleaned to the PoC. 171 * 172 * - start - virtual start address of region 173 * - end - virtual end address of region 174 */ 175 SYM_FUNC_START(__pi_dcache_clean_poc) 176 dcache_by_line_op cvac, sy, x0, x1, x2, x3 177 ret 178 SYM_FUNC_END(__pi_dcache_clean_poc) 179 SYM_FUNC_ALIAS(dcache_clean_poc, __pi_dcache_clean_poc) 180 181 /* 182 * dcache_clean_pop(start, end) 183 * 184 * Ensure that any D-cache lines for the interval [start, end) 185 * are cleaned to the PoP. 186 * 187 * - start - virtual start address of region 188 * - end - virtual end address of region 189 */ 190 SYM_FUNC_START(__pi_dcache_clean_pop) 191 alternative_if_not ARM64_HAS_DCPOP 192 b dcache_clean_poc 193 alternative_else_nop_endif 194 dcache_by_line_op cvap, sy, x0, x1, x2, x3 195 ret 196 SYM_FUNC_END(__pi_dcache_clean_pop) 197 SYM_FUNC_ALIAS(dcache_clean_pop, __pi_dcache_clean_pop) 198