1/* $FreeBSD$ */ 2/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */ 3 4/*- 5 * Copyright (C) 2001 Benno Rice 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 * 17 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28/*- 29 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 30 * Copyright (C) 1995, 1996 TooLs GmbH. 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. All advertising materials mentioning features or use of this software 42 * must display the following acknowledgement: 43 * This product includes software developed by TooLs GmbH. 44 * 4. The name of TooLs GmbH may not be used to endorse or promote products 45 * derived from this software without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 50 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 52 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 53 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 54 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 55 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 56 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59#include "assym.s" 60 61#include <sys/syscall.h> 62 63#include <machine/trap.h> 64#include <machine/param.h> 65#include <machine/spr.h> 66#include <machine/asm.h> 67 68/* Locate the per-CPU data structure */ 69#define GET_CPUINFO(r) \ 70 mfsprg0 r 71 72/* 73 * Compiled KERNBASE location and the kernel load address 74 */ 75 .globl kernbase 76 .set kernbase, KERNBASE 77 78#define TMPSTKSZ 8192 /* 8K temporary stack */ 79#define OFWSTKSZ 4096 /* 4K Open Firmware stack */ 80 81/* 82 * Globals 83 */ 84 .data 85 .align 4 86GLOBAL(tmpstk) 87 .space TMPSTKSZ 88GLOBAL(ofwstk) 89 .space OFWSTKSZ 90GLOBAL(esym) 91 .llong 0 /* end of symbol table */ 92 93GLOBAL(ofmsr) 94 .llong 0, 0, 0, 0, 0 /* msr/sprg0-3 used in Open Firmware */ 95 96#define INTRCNT_COUNT 256 /* max(HROWPIC_IRQMAX,OPENPIC_IRQMAX) */ 97GLOBAL(intrnames) 98 .space INTRCNT_COUNT * (MAXCOMLEN + 1) * 2 99GLOBAL(eintrnames) 100 .align 4 101GLOBAL(intrcnt) 102 .space INTRCNT_COUNT * 4 * 2 103GLOBAL(eintrcnt) 104 105/* 106 * File-scope for locore.S 107 */ 108idle_u: 109 .llong 0 /* fake uarea during idle after exit */ 110openfirmware_entry: 111 .llong 0 /* Open Firmware entry point */ 112srsave: 113 .llong 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 114 115 .text 116 .globl btext 117btext: 118 119/* 120 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 121 * mark the start of kernel text. 122 */ 123 .globl kernel_text 124kernel_text: 125 126/* 127 * Startup entry. Note, this must be the first thing in the text 128 * segment! 129 */ 130 .text 131ASENTRY(__start) 132 li 8,0 133 li 9,0x100 134 mtctr 9 1351: 136 dcbf 0,8 137 icbi 0,8 138 addi 8,8,0x20 139 bdnz 1b 140 sync 141 isync 142 143 /* Save the argument pointer and length */ 144 mr 20,6 145 mr 21,7 146 147 lis 8,openfirmware_entry@ha 148 std 5,openfirmware_entry@l(8) /* save client interface handler */ 149 150 /* Set up the stack pointer */ 151 lis 1,(tmpstk+TMPSTKSZ-48)@ha 152 addi 1,1,(tmpstk+TMPSTKSZ-48)@l 153 154 /* Set up the TOC pointer */ 155 lis 2,tocbase@ha 156 ld 2,tocbase@l(2) 157 158 mfmsr 0 159 lis 9,ofmsr@ha 160 stdu 0,ofmsr@l(9) 161 162 mfsprg0 0 /* save SPRG0-3 */ 163 std 0,8(9) /* ofmsr[1] = sprg0 */ 164 mfsprg1 0 165 std 0,16(9) /* ofmsr[2] = sprg1 */ 166 mfsprg2 0 167 std 0,24(9) /* ofmsr[3] = sprg2 */ 168 mfsprg3 0 169 std 0,32(9) /* ofmsr[4] = sprg3 */ 170 171 /* Switch to 64-bit mode */ 172 mfmsr 9 173 li 8,1 174 insrdi 9,8,1,0 175 mtmsrd 9 176 177 bl OF_initial_setup 178 nop 179 180 lis 4,end@ha 181 addi 4,4,end@l 182 mr 5,4 183 184 lis 3,kernbase@ha 185 addi 3,3,kernbase@l 186 187 /* Restore the argument pointer and length */ 188 mr 6,20 189 mr 7,21 190 191 bl powerpc_init 192 nop 193 mr %r1, %r3 194 li %r3, 0 195 std %r3, 0(%r1) 196 bl mi_startup 197 nop 198 b OF_exit 199 nop 200 201/* 202 * PPC64 ABI TOC base 203 */ 204 205 .align 3 206 .globl tocbase 207tocbase: 208 .llong .TOC.@tocbase 209 210/* 211 * Open Firmware Real-mode Entry Point. This is a huge pain. 212 */ 213 214ASENTRY(ofw_32bit_mode_entry) 215 mflr %r0 216 std %r0,16(%r1) 217 stdu %r1,-208(%r1) 218 219 /* 220 * We need to save the following, because OF's register save/ 221 * restore code assumes that the contents of registers are 222 * at most 32 bits wide: lr, cr, r2, r13-r31, the old MSR. These 223 * get placed in that order in the stack. 224 */ 225 226 mfcr %r4 227 std %r4,48(%r1) 228 std %r13,56(%r1) 229 std %r14,64(%r1) 230 std %r15,72(%r1) 231 std %r16,80(%r1) 232 std %r17,88(%r1) 233 std %r18,96(%r1) 234 std %r19,104(%r1) 235 std %r20,112(%r1) 236 std %r21,120(%r1) 237 std %r22,128(%r1) 238 std %r23,136(%r1) 239 std %r24,144(%r1) 240 std %r25,152(%r1) 241 std %r26,160(%r1) 242 std %r27,168(%r1) 243 std %r28,176(%r1) 244 std %r29,184(%r1) 245 std %r30,192(%r1) 246 std %r31,200(%r1) 247 248 /* Record the old MSR */ 249 mfmsr %r6 250 251 /* read client interface handler */ 252 lis %r4,openfirmware_entry@ha 253 ld %r4,openfirmware_entry@l(%r4) 254 255 /* 256 * Set the MSR to the OF value. This has the side effect of disabling 257 * exceptions, which is important for the next few steps. 258 */ 259 260 lis %r5,ofmsr@ha 261 ld %r5,ofmsr@l(%r5) 262 mtmsrd %r5 263 isync 264 265 /* 266 * Set up OF stack. This needs to be accessible in real mode and 267 * use the 32-bit ABI stack frame format. The pointer to the current 268 * kernel stack is placed at the very top of the stack along with 269 * the old MSR so we can get them back later. 270 */ 271 mr %r5,%r1 272 lis %r1,(ofwstk+OFWSTKSZ-32)@ha 273 addi %r1,%r1,(ofwstk+OFWSTKSZ-32)@l 274 std %r5,8(%r1) /* Save real stack pointer */ 275 std %r2,16(%r1) /* Save old TOC */ 276 std %r6,24(%r1) /* Save old MSR */ 277 li %r5,0 278 stw %r5,4(%r1) 279 stw %r5,0(%r1) 280 281 /* Finally, branch to OF */ 282 mtctr %r4 283 bctrl 284 285 /* Reload stack pointer and MSR from the OFW stack */ 286 ld %r6,24(%r1) 287 ld %r2,16(%r1) 288 ld %r1,8(%r1) 289 290 /* Now set the real MSR */ 291 mtmsrd %r6 292 isync 293 294 /* Sign-extend the return value from OF */ 295 extsw %r3,%r3 296 297 /* Restore all the non-volatile registers */ 298 ld %r5,48(%r1) 299 mtcr %r5 300 ld %r13,56(%r1) 301 ld %r14,64(%r1) 302 ld %r15,72(%r1) 303 ld %r16,80(%r1) 304 ld %r17,88(%r1) 305 ld %r18,96(%r1) 306 ld %r19,104(%r1) 307 ld %r20,112(%r1) 308 ld %r21,120(%r1) 309 ld %r22,128(%r1) 310 ld %r23,136(%r1) 311 ld %r24,144(%r1) 312 ld %r25,152(%r1) 313 ld %r26,160(%r1) 314 ld %r27,168(%r1) 315 ld %r28,176(%r1) 316 ld %r29,184(%r1) 317 ld %r30,192(%r1) 318 ld %r31,200(%r1) 319 320 /* Restore the stack and link register */ 321 ld %r1,0(%r1) 322 ld %r0,16(%r1) 323 mtlr %r0 324 blr 325 326/* 327 * int setfault() 328 * 329 * Similar to setjmp to setup for handling faults on accesses to user memory. 330 * Any routine using this may only call bcopy, either the form below, 331 * or the (currently used) C code optimized, so it doesn't use any non-volatile 332 * registers. 333 */ 334ASENTRY(setfault) 335 mflr 0 336 mfcr 12 337 mfsprg 4,0 338 ld 4,PC_CURTHREAD(4) 339 ld 4,TD_PCB(4) 340 std 3,PCB_ONFAULT(4) 341 std 0,0(3) 342 std 1,8(3) 343 std 2,16(3) 344 345 std %r12,24(%r3) /* Save the non-volatile GP regs. */ 346 std %r13,24+1*8(%r3) 347 std %r14,24+2*8(%r3) 348 std %r15,24+3*8(%r3) 349 std %r16,24+4*8(%r3) 350 std %r17,24+5*8(%r3) 351 std %r18,24+6*8(%r3) 352 std %r19,24+7*8(%r3) 353 std %r20,24+8*8(%r3) 354 std %r21,24+9*8(%r3) 355 std %r22,24+10*8(%r3) 356 std %r23,24+11*8(%r3) 357 std %r24,24+12*8(%r3) 358 std %r25,24+13*8(%r3) 359 std %r26,24+14*8(%r3) 360 std %r27,24+15*8(%r3) 361 std %r28,24+16*8(%r3) 362 std %r29,24+17*8(%r3) 363 std %r30,24+18*8(%r3) 364 std %r31,24+19*8(%r3) 365 366 xor 3,3,3 367 blr 368 369#include <powerpc/aim/trap_subr64.S> 370