1 /* $NetBSD: ofwreal.S,v 1.17 2023/06/24 05:31:05 msaitoh Exp $ */ 2 3 /* 4 * Copyright (C) 1996 Wolfgang Solfrank. 5 * Copyright (C) 1996 TooLs GmbH. 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 TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * This file provides a real-mode client interface on machines, that 36 * (incorrectly) only implement virtual mode client interface. 37 * 38 * It assumes though, that any actual memory in the machine is 39 * mapped 1:1 even by the virtual mode OpenFirmware. 40 * Furthermore it assumes that addresses returned by OpenFirmware are not 41 * accessed by the client. 42 * 43 * TODO: handle set-callback specially 44 */ 45 46 #include <machine/psl.h> 47 #include <machine/trap.h> 48 #include <machine/asm.h> 49 50 #define CACHELINE 32 /* Note that this value is really 51 hardwired */ 52 53 .data 54 ofentry: 55 .long 0 /* actual entry to firmware in 56 virtual mode */ 57 58 #define BATSIZE (8*8) 59 #define SRSIZE (16*4) 60 #define SPRGSIZE (4*4) 61 #define SDR1SIZE 4 62 #define SI1SIZE (2*256) 63 #define SI2SIZE (3*256) 64 #define SVSIZE (BATSIZE+SRSIZE+SPRGSIZE+SDR1SIZE+SI1SIZE+SI2SIZE) 65 66 .local fwsave 67 .comm fwsave,SVSIZE,8 68 69 .local clsave 70 .comm clsave,SVSIZE,8 71 72 ENTRY(ofwr_init) 73 mflr %r31 /* save return address */ 74 75 mr %r13,%r6 /* save args */ 76 mr %r12,%r7 /* save argslen */ 77 lis %r8,ofentry@ha 78 stw %r5,ofentry@l(%r8) /* save virtual mode firmware entry */ 79 80 lis %r3,fwsave@ha /* save the mmu values of the 81 firmware */ 82 addi %r3,%r3,fwsave@l 83 bl savemmu 84 85 lis %r5,fwentry@ha /* get new firmware entry */ 86 addi %r5,%r5,fwentry@l 87 88 mr %r6,%r13 /* restore args pointer */ 89 mr %r7,%r12 /* restore args length */ 90 mtlr %r31 /* restore return address */ 91 blr 92 93 /* 94 * Emulated firmware entry. 95 */ 96 fwentry: 97 mflr %r0 /* save return address */ 98 stw %r0,4(%r1) 99 stwu %r1,-32(%r1) /* setup stack frame */ 100 stw %r3,8(%r1) /* save arg */ 101 stw %r2,16(%r1) /* save r2 */ 102 stw %r13,20(%r1) /* save r13 */ 103 104 lis %r3,clsave@ha /* save mmu values of client */ 105 addi %r3,%r3,clsave@l 106 bl savemmu 107 108 lis %r3,fwsave@ha /* restore mmu values of firmware */ 109 addi %r3,%r3,fwsave@l 110 bl restoremmu 111 112 lis %r3,ofentry@ha 113 lwz %r3,ofentry@l(%r3) /* get actual firmware entry */ 114 mtlr %r3 115 116 mfmsr %r4 117 stw %r4,12(%r1) /* save MSR */ 118 ori %r4,%r4,PSL_IR|PSL_DR /* turn on MMU */ 119 andi. %r4,%r4,~PSL_EE@l /* turn off interrupts */ 120 mtmsr %r4 121 isync 122 123 lwz %r3,8(%r1) /* restore arg */ 124 blrl /* do actual firmware call */ 125 stw %r3,8(%r1) /* save return value */ 126 127 lwz %r4,12(%r1) /* get saved MSR */ 128 mtmsr %r4 129 isync 130 131 lis %r3,fwsave@ha /* save mmu values of firmware */ 132 addi %r3,%r3,fwsave@l /* (might not be necessary, but... */ 133 bl savemmu 134 135 lis %r3,clsave@ha /* restore mmu values of client */ 136 addi %r3,%r3,clsave@l 137 bl restoremmu 138 139 lwz %r13,20(%r1) /* restore saved value */ 140 lwz %r2,16(%r1) /* restore saved value */ 141 lwz %r3,8(%r1) /* restore return value */ 142 lwz %r1,0(%r1) /* and return */ 143 lwz %r0,4(%r1) 144 mtlr %r0 145 blr 146 147 /* 148 * Save everything related to the mmu to the saveare pointed to by r3. 149 */ 150 savemmu: 151 152 mfibatl %r4,0 /* save BATs */ 153 stw %r4,0(%r3) 154 mfibatu %r4,0 155 stw %r4,4(%r3) 156 mfibatl %r4,1 157 stw %r4,8(%r3) 158 mfibatu %r4,1 159 stw %r4,12(%r3) 160 mfibatl %r4,2 161 stw %r4,16(%r3) 162 mfibatu %r4,2 163 stw %r4,20(%r3) 164 mfibatl %r4,3 165 stw %r4,24(%r3) 166 mfibatu %r4,3 167 stw %r4,28(%r3) 168 mfdbatl %r4,0 169 stw %r4,32(%r3) 170 mfdbatu %r4,0 171 stw %r4,36(%r3) 172 mfdbatl %r4,1 173 stw %r4,40(%r3) 174 mfdbatu %r4,1 175 stw %r4,44(%r3) 176 mfdbatl %r4,2 177 stw %r4,48(%r3) 178 mfdbatu %r4,2 179 stw %r4,52(%r3) 180 mfdbatl %r4,3 181 stw %r4,56(%r3) 182 mfdbatu %r4,3 183 stwu %r4,60(%r3) 184 185 li %r4,0 /* save SRs */ 186 1: 187 addis %r4,%r4,-0x10000000@ha 188 or. %r4,%r4,%r4 189 mfsrin %r5,%r4 190 stwu %r5,4(%r3) 191 bne 1b 192 193 mfsprg0 %r4 /* save SPRGs */ 194 stw %r4,4(%r3) 195 mfsprg1 %r4 196 stw %r4,8(%r3) 197 mfsprg2 %r4 198 stw %r4,12(%r3) 199 mfsprg3 %r4 200 stw %r4,16(%r3) 201 202 mfsdr1 %r4 /* save SDR1 */ 203 stw %r4,20(%r3) 204 205 addi %r4,%r3,24 206 mflr %r11 207 li %r3,EXC_DSI /* save DSI/ISI trap vectors */ 208 li %r5,SI1SIZE 209 bl copy 210 211 mtlr %r11 212 li %r3,EXC_IMISS /* save MISS trap vectors */ 213 li %r5,SI2SIZE 214 215 copy: 216 li %r6,CACHELINE 217 1: 218 lwz %r7,0(%r3) 219 lwz %r8,4(%r3) 220 lwz %r9,8(%r3) 221 lwz %r10,12(%r3) 222 stw %r7,0(%r4) 223 stw %r8,4(%r4) 224 stw %r9,8(%r4) 225 stw %r10,12(%r4) 226 lwz %r7,16(%r3) 227 lwz %r8,20(%r3) 228 lwz %r9,24(%r3) 229 lwz %r10,28(%r3) 230 stw %r7,16(%r4) 231 stw %r8,20(%r4) 232 stw %r9,24(%r4) 233 stw %r10,28(%r4) 234 dcbst 0,%r4 235 icbi 0,%r4 236 add %r3,%r3,%r6 237 add %r4,%r4,%r6 238 subf. %r5,%r6,%r5 239 bgt 1b 240 241 dcbst 0,%r4 242 icbi 0,%r4 243 244 sync 245 isync 246 247 blr 248 249 /* 250 * Restore everything related to the mmu from the saveare pointed to by r3. 251 */ 252 restoremmu: 253 mfmsr %r12 254 andi. %r4,%r12,~(PSL_IR|PSL_DR)@l 255 mtmsr %r4 /* Disable MMU */ 256 isync 257 258 li %r4,0 /* first, invalidate BATs */ 259 mtibatu 0,%r4 260 mtibatu 1,%r4 261 mtibatu 2,%r4 262 mtibatu 3,%r4 263 mtdbatu 0,%r4 264 mtdbatu 1,%r4 265 mtdbatu 2,%r4 266 mtdbatu 3,%r4 267 268 lwz %r4,0(%r3) 269 mtibatl 0,%r4 /* restore BATs */ 270 lwz %r4,4(%r3) 271 mtibatu 0,%r4 272 lwz %r4,8(%r3) 273 mtibatl 1,%r4 274 lwz %r4,12(%r3) 275 mtibatu 1,%r4 276 lwz %r4,16(%r3) 277 mtibatl 2,%r4 278 lwz %r4,20(%r3) 279 mtibatu 2,%r4 280 lwz %r4,24(%r3) 281 mtibatl 3,%r4 282 lwz %r4,28(%r3) 283 mtibatu 3,%r4 284 lwz %r4,32(%r3) 285 mtdbatl 0,%r4 286 lwz %r4,36(%r3) 287 mtdbatu 0,%r4 288 lwz %r4,40(%r3) 289 mtdbatl 1,%r4 290 lwz %r4,44(%r3) 291 mtdbatu 1,%r4 292 lwz %r4,48(%r3) 293 mtdbatl 2,%r4 294 lwz %r4,52(%r3) 295 mtdbatu 2,%r4 296 lwz %r4,56(%r3) 297 mtdbatl 3,%r4 298 lwzu %r4,60(%r3) 299 mtdbatu 3,%r4 300 301 li %r4,0 /* restore SRs */ 302 1: 303 lwzu %r5,4(%r3) 304 addis %r4,%r4,-0x10000000@ha 305 or. %r4,%r4,%r4 306 mtsrin %r5,%r4 307 bne 1b 308 309 lwz %r4,4(%r3) 310 mtsprg0 %r4 /* restore SPRGs */ 311 lwz %r4,8(%r3) 312 mtsprg1 %r4 313 lwz %r4,12(%r3) 314 mtsprg2 %r4 315 lwz %r4,16(%r3) 316 mtsprg3 %r4 317 318 sync /* remove everything from tlb */ 319 lis %r4,0x40000@ha 320 li %r5,0x1000 321 1: 322 subf. %r4,%r5,%r4 323 tlbie %r4 324 bne 1b 325 326 sync 327 tlbsync 328 sync 329 330 lwz %r4,20(%r3) 331 sync 332 mtsdr1 %r4 /* restore SDR1 */ 333 334 addi %r3,%r3,24 335 mflr %r11 336 li %r4,EXC_DSI /* restore DSI/ISI trap vectors */ 337 li %r5,SI1SIZE 338 bl copy 339 340 li %r4,EXC_IMISS /* restore MISS trap vectors */ 341 li %r5,SI2SIZE 342 bl copy 343 344 /* tlbia */ 345 sync 346 li %r3,0x40 347 mtctr %r3 348 li %r4,0 349 1: 350 tlbie %r4 351 addi %r4,%r4,0x1000 352 bdnz 1b 353 sync 354 tlbsync 355 sync 356 357 mtmsr %r12 /* restore MMU */ 358 mtlr %r11 359 blr 360
Indexes created Sun Oct 19 02:09:48 GMT 2025