1 /* $NetBSD: cpufunc_asm_arm8.S,v 1.11 2022/10/20 06:58:38 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1997 ARM Limited 5 * Copyright (c) 1997 Causality Limited 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Causality Limited. 19 * 4. The name of Causality Limited may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY CAUSALITY LIMITED ``AS IS'' AND ANY EXPRESS 24 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 25 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL CAUSALITY LIMITED BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * ARM8 assembly functions for CPU / MMU / TLB specific operations 36 */ 37 38 #include "assym.h" 39 #include <machine/asm.h> 40 #include <arm/locore.h> 41 42 ENTRY(arm8_clock_config) 43 mrc p15, 0, r3, c15, c0, 0 /* Read the clock register */ 44 bic r2, r3, #0x11 /* turn off dynamic clocking 45 and clear L bit */ 46 mcr p15, 0, r2, c15, c0, 0 /* Write clock register */ 47 48 bic r2, r3, r0 /* Clear bits */ 49 eor r2, r2, r1 /* XOR bits */ 50 bic r2, r2, #0x10 /* clear the L bit */ 51 52 bic r1, r2, #0x01 /* still keep dynamic clocking off */ 53 mcr p15, 0, r1, c15, c0, 0 /* Write clock register */ 54 mov r0, r0 /* NOP */ 55 mov r0, r0 /* NOP */ 56 mov r0, r0 /* NOP */ 57 mov r0, r0 /* NOP */ 58 mcr p15, 0, r2, c15, c0, 0 /* Write clock register */ 59 mov r0, r3 /* Return old value */ 60 mov pc, lr 61 END(arm8_clock_config) 62 63 /* 64 * Functions to set the MMU Translation Table Base register 65 * 66 * We need to clean and flush the cache as it uses virtual 67 * addresses that are about to change. 68 */ 69 ENTRY(arm8_setttb) 70 mrs r3, cpsr 71 orr r2, r3, #(I32_bit | F32_bit) 72 msr cpsr_all, r2 73 74 stmfd sp!, {r0-r3, lr} 75 bl _C_LABEL(arm8_cache_cleanID) 76 ldmfd sp!, {r0-r3, lr} 77 78 cmp r1, #0 @ do we need to flush the caches? 79 80 mcrne p15, 0, r0, c7, c7, 0 /* flush I+D cache */ 81 82 /* Write the TTB */ 83 mcr p15, 0, r0, c2, c0, 0 84 85 /* If we have updated the TTB we must flush the TLB */ 86 mcrne p15, 0, r0, c8, c7, 0 87 88 /* For good measure we will flush the IDC as well */ 89 mcrne p15, 0, r0, c7, c7, 0 90 91 /* Make sure that pipeline is emptied */ 92 mov r0, r0 93 mov r0, r0 94 msr cpsr_all, r3 95 96 mov pc, lr 97 END(arm8_setttb) 98 99 /* 100 * TLB functions 101 */ 102 ENTRY(arm8_tlb_flushID) 103 mcr p15, 0, r0, c8, c7, 0 /* flush I+D tlb */ 104 mov pc, lr 105 END(arm8_tlb_flushID) 106 107 ENTRY(arm8_tlb_flushID_SE) 108 mcr p15, 0, r0, c8, c7, 1 /* flush I+D tlb single entry */ 109 #if PAGE_SIZE == 2 * L2_S_SIZE 110 add r0, r0, #L2_S_SIZE 111 mcr p15, 0, r0, c8, c7, 1 /* flush I+D tlb single entry */ 112 #endif 113 mov pc, lr 114 END(arm8_tlb_flushID_SE) 115 116 /* 117 * Cache functions 118 */ 119 ENTRY(arm8_cache_flushID) 120 mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */ 121 mov pc, lr 122 END(arm8_cache_flushID) 123 124 ENTRY(arm8_cache_flushID_E) 125 mcr p15, 0, r0, c7, c7, 1 /* flush I+D single entry */ 126 mov pc, lr 127 END(arm8_cache_flushID_E) 128 129 ENTRY(arm8_cache_cleanID) 130 mov r0, #0x00000000 131 132 1: mov r2, r0 133 mcr p15, 0, r2, c7, c11, 1 134 add r2, r2, #0x10 135 mcr p15, 0, r2, c7, c11, 1 136 add r2, r2, #0x10 137 mcr p15, 0, r2, c7, c11, 1 138 add r2, r2, #0x10 139 mcr p15, 0, r2, c7, c11, 1 140 add r2, r2, #0x10 141 mcr p15, 0, r2, c7, c11, 1 142 add r2, r2, #0x10 143 mcr p15, 0, r2, c7, c11, 1 144 add r2, r2, #0x10 145 mcr p15, 0, r2, c7, c11, 1 146 add r2, r2, #0x10 147 mcr p15, 0, r2, c7, c11, 1 148 add r2, r2, #0x10 149 mcr p15, 0, r2, c7, c11, 1 150 add r2, r2, #0x10 151 mcr p15, 0, r2, c7, c11, 1 152 add r2, r2, #0x10 153 mcr p15, 0, r2, c7, c11, 1 154 add r2, r2, #0x10 155 mcr p15, 0, r2, c7, c11, 1 156 add r2, r2, #0x10 157 mcr p15, 0, r2, c7, c11, 1 158 add r2, r2, #0x10 159 mcr p15, 0, r2, c7, c11, 1 160 add r2, r2, #0x10 161 mcr p15, 0, r2, c7, c11, 1 162 add r2, r2, #0x10 163 mcr p15, 0, r2, c7, c11, 1 164 165 adds r0, r0, #0x04000000 166 bne 1b 167 168 mov pc, lr 169 END(arm8_cache_cleanID) 170 171 ENTRY(arm8_cache_cleanID_E) 172 mcr p15, 0, r0, c7, c11, 1 /* clean I+D single entry */ 173 mov pc, lr 174 END(arm8_cache_cleanID_E) 175 176 ENTRY(arm8_cache_purgeID) 177 /* 178 * ARM810 bug 3 179 * 180 * Clean and invalidate entry will not invalidate the entry 181 * if the line was already clean. (mcr p15, 0, rd, c7, 15, 1) 182 * 183 * Instead of using the clean and invalidate entry operation 184 * use a separate clean and invalidate entry operations. 185 * i.e. 186 * mcr p15, 0, rd, c7, c11, 1 187 * mcr p15, 0, rd, c7, c7, 1 188 */ 189 190 mov r0, #0x00000000 191 192 mrs r3, cpsr 193 orr r2, r3, #(I32_bit | F32_bit) 194 msr cpsr_all, r2 195 196 1: mov r2, r0 197 mcr p15, 0, r2, c7, c11, 1 198 mcr p15, 0, r2, c7, c7, 1 199 add r2, r2, #0x10 200 mcr p15, 0, r2, c7, c11, 1 201 mcr p15, 0, r2, c7, c7, 1 202 add r2, r2, #0x10 203 mcr p15, 0, r2, c7, c11, 1 204 mcr p15, 0, r2, c7, c7, 1 205 add r2, r2, #0x10 206 mcr p15, 0, r2, c7, c11, 1 207 mcr p15, 0, r2, c7, c7, 1 208 add r2, r2, #0x10 209 mcr p15, 0, r2, c7, c11, 1 210 mcr p15, 0, r2, c7, c7, 1 211 add r2, r2, #0x10 212 mcr p15, 0, r2, c7, c11, 1 213 mcr p15, 0, r2, c7, c7, 1 214 add r2, r2, #0x10 215 mcr p15, 0, r2, c7, c11, 1 216 mcr p15, 0, r2, c7, c7, 1 217 add r2, r2, #0x10 218 mcr p15, 0, r2, c7, c11, 1 219 mcr p15, 0, r2, c7, c7, 1 220 add r2, r2, #0x10 221 mcr p15, 0, r2, c7, c11, 1 222 mcr p15, 0, r2, c7, c7, 1 223 add r2, r2, #0x10 224 mcr p15, 0, r2, c7, c11, 1 225 mcr p15, 0, r2, c7, c7, 1 226 add r2, r2, #0x10 227 mcr p15, 0, r2, c7, c11, 1 228 mcr p15, 0, r2, c7, c7, 1 229 add r2, r2, #0x10 230 mcr p15, 0, r2, c7, c11, 1 231 mcr p15, 0, r2, c7, c7, 1 232 add r2, r2, #0x10 233 mcr p15, 0, r2, c7, c11, 1 234 mcr p15, 0, r2, c7, c7, 1 235 add r2, r2, #0x10 236 mcr p15, 0, r2, c7, c11, 1 237 mcr p15, 0, r2, c7, c7, 1 238 add r2, r2, #0x10 239 mcr p15, 0, r2, c7, c11, 1 240 mcr p15, 0, r2, c7, c7, 1 241 add r2, r2, #0x10 242 mcr p15, 0, r2, c7, c11, 1 243 mcr p15, 0, r2, c7, c7, 1 244 245 adds r0, r0, #0x04000000 246 bne 1b 247 248 msr cpsr_all, r3 249 mov pc, lr 250 END(arm8_cache_purgeID) 251 252 ENTRY(arm8_cache_purgeID_E) 253 /* 254 * ARM810 bug 3 255 * 256 * Clean and invalidate entry will not invalidate the entry 257 * if the line was already clean. (mcr p15, 0, rd, c7, 15, 1) 258 * 259 * Instead of using the clean and invalidate entry operation 260 * use a separate clean and invalidate entry operations. 261 * i.e. 262 * mcr p15, 0, rd, c7, c11, 1 263 * mcr p15, 0, rd, c7, c7, 1 264 */ 265 mrs r3, cpsr 266 orr r2, r3, #(I32_bit | F32_bit) 267 msr cpsr_all, r2 268 mcr p15, 0, r0, c7, c11, 1 /* clean I+D single entry */ 269 mcr p15, 0, r0, c7, c7, 1 /* flush I+D single entry */ 270 msr cpsr_all, r3 271 mov pc, lr 272 END(arm8_cache_purgeID_E) 273 274 /* 275 * Context switch. 276 * 277 * These are the CPU-specific parts of the context switcher cpu_switch() 278 * These functions actually perform the TTB reload. 279 */ 280 ENTRY(arm8_context_switch) 281 /* For good measure we will flush the IDC as well */ 282 mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */ 283 284 /* Write the TTB */ 285 mcr p15, 0, r0, c2, c0, 0 286 287 /* If we have updated the TTB we must flush the TLB */ 288 mcr p15, 0, r0, c8, c7, 0 /* flush the I+D tlb */ 289 290 #if 0 291 /* For good measure we will flush the IDC as well */ 292 mcr p15, 0, r0, c7, c7, 0 /* flush I+D cache */ 293 #endif 294 295 /* Make sure that pipeline is emptied */ 296 mov r0, r0 297 mov r0, r0 298 mov pc, lr 299 END(arm8_context_switch) 300
Indexes created Sat Sep 20 22:09:52 GMT 2025