projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 47d1a6e1 WD |
1 | /* |
| 2 | * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> | |
| 3 | * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> | |
| 4 | * Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de> | |
| 5 | * | |
| 6 | * See file CREDITS for list of people who contributed to this | |
| 7 | * project. | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or | |
| 10 | * modify it under the terms of the GNU General Public License as | |
| 11 | * published by the Free Software Foundation; either version 2 of | |
| 12 | * the License, or (at your option) any later version. | |
| 13 | * | |
| 14 | * This program is distributed in the hope that it will be useful, | |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | * GNU General Public License for more details. | |
| 18 | * | |
| 19 | * You should have received a copy of the GNU General Public License | |
| 20 | * along with this program; if not, write to the Free Software | |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 22 | * MA 02111-1307 USA | |
| 23 | */ | |
| 24 | ||
| 25 | /* | |
| 26 | * U-Boot - Startup Code for MPC8260 PowerPC based Embedded Boards | |
| 27 | */ | |
| 28 | #include <config.h> | |
| 29 | #include <mpc8260.h> | |
| 30 | #include <version.h> | |
| 31 | ||
| 32 | #define CONFIG_8260 1 /* needed for Linux kernel header files */ | |
| 33 | #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ | |
| 34 | ||
| 35 | #include <ppc_asm.tmpl> | |
| 36 | #include <ppc_defs.h> | |
| 37 | ||
| 38 | #include <asm/cache.h> | |
| 39 | #include <asm/mmu.h> | |
| 40 | ||
| 41 | #ifndef CONFIG_IDENT_STRING | |
| 42 | #define CONFIG_IDENT_STRING "" | |
| 43 | #endif | |
| 44 | ||
| 45 | /* We don't want the MMU yet. | |
| 46 | */ | |
| 47 | #undef MSR_KERNEL | |
| 48 | /* Floating Point enable, Machine Check and Recoverable Interr. */ | |
| 49 | #ifdef DEBUG | |
| 50 | #define MSR_KERNEL (MSR_FP|MSR_RI) | |
| 51 | #else | |
| 52 | #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI) | |
| 53 | #endif | |
| 54 | ||
| 55 | /* | |
| 56 | * Set up GOT: Global Offset Table | |
| 57 | * | |
| 58 | * Use r14 to access the GOT | |
| 59 | */ | |
| 60 | START_GOT | |
| 61 | GOT_ENTRY(_GOT2_TABLE_) | |
| 62 | GOT_ENTRY(_FIXUP_TABLE_) | |
| 63 | ||
| 64 | GOT_ENTRY(_start) | |
| 65 | GOT_ENTRY(_start_of_vectors) | |
| 66 | GOT_ENTRY(_end_of_vectors) | |
| 67 | GOT_ENTRY(transfer_to_handler) | |
| 68 | ||
| 3b57fe0a | 69 | GOT_ENTRY(__init_end) |
| 47d1a6e1 | 70 | GOT_ENTRY(_end) |
| 5d232d0e | 71 | GOT_ENTRY(__bss_start) |
| 47d1a6e1 WD |
72 | #if defined(CONFIG_HYMOD) |
| 73 | GOT_ENTRY(environment) | |
| 74 | #endif | |
| 75 | END_GOT | |
| 76 | ||
| 77 | /* | |
| 78 | * Version string - must be in data segment because MPC8260 uses the first | |
| 79 | * 256 bytes for the Hard Reset Configuration Word table (see below). | |
| 80 | * Similarly, can't have the U-Boot Magic Number as the first thing in | |
| 81 | * the image - don't know how this will affect the image tools, but I guess | |
| 82 | * I'll find out soon | |
| 83 | */ | |
| 84 | .data | |
| 85 | .globl version_string | |
| 86 | version_string: | |
| 87 | .ascii U_BOOT_VERSION | |
| 88 | .ascii " (", __DATE__, " - ", __TIME__, ")" | |
| 89 | .ascii CONFIG_IDENT_STRING, "\0" | |
| 90 | ||
| 91 | /* | |
| 92 | * Hard Reset Configuration Word (HRCW) table | |
| 93 | * | |
| 94 | * The Hard Reset Configuration Word (HRCW) sets a number of useful things | |
| 95 | * such as whether there is an external memory controller, whether the | |
| 96 | * PowerPC core is disabled (i.e. only the communications processor is | |
| 97 | * active, accessed by another CPU on the bus), whether using external | |
| 98 | * arbitration, external bus mode, boot port size, core initial prefix, | |
| 99 | * internal space base, boot memory space, etc. | |
| 100 | * | |
| 101 | * These things dictate where the processor begins execution, where the | |
| 102 | * boot ROM appears in memory, the memory controller setup when access | |
| 103 | * boot ROM, etc. The HRCW is *extremely* important. | |
| 104 | * | |
| 105 | * The HRCW is read from the bus during reset. One CPU on the bus will | |
| 106 | * be a hard reset configuration master, any others will be hard reset | |
| 107 | * configuration slaves. The master reads eight HRCWs from flash during | |
| 108 | * reset - the first it uses for itself, the other 7 it communicates to | |
| 109 | * up to 7 configuration slaves by some complicated mechanism, which is | |
| 110 | * not really important here. | |
| 111 | * | |
| 112 | * The configuration master performs 32 successive reads starting at address | |
| 113 | * 0 and incrementing by 8 each read (i.e. on 64 bit boundaries) but only 8 | |
| 114 | * bits is read, and always from byte lane D[0-7] (so that port size of the | |
| 115 | * boot device does not matter). The first four reads form the 32 bit HRCW | |
| 116 | * for the master itself. The second four reads form the HRCW for the first | |
| 117 | * slave, and so on, up to seven slaves. The 32 bit HRCW is formed by | |
| 118 | * concatenating the four bytes, with the first read placed in byte 0 (the | |
| 119 | * most significant byte), and so on with the fourth read placed in byte 3 | |
| 120 | * (the least significant byte). | |
| 121 | */ | |
| 122 | #define _HRCW_TABLE_ENTRY(w) \ | |
| 123 | .fill 8,1,(((w)>>24)&0xff); \ | |
| 124 | .fill 8,1,(((w)>>16)&0xff); \ | |
| 125 | .fill 8,1,(((w)>> 8)&0xff); \ | |
| 126 | .fill 8,1,(((w) )&0xff) | |
| 127 | .text | |
| 128 | .globl _hrcw_table | |
| 129 | _hrcw_table: | |
| 130 | _HRCW_TABLE_ENTRY(CFG_HRCW_MASTER) | |
| 131 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE1) | |
| 132 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE2) | |
| 133 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE3) | |
| 134 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE4) | |
| 135 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE5) | |
| 136 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE6) | |
| 137 | _HRCW_TABLE_ENTRY(CFG_HRCW_SLAVE7) | |
| 138 | /* | |
| 139 | * After configuration, a system reset exception is executed using the | |
| 140 | * vector at offset 0x100 relative to the base set by MSR[IP]. If MSR[IP] | |
| 141 | * is 0, the base address is 0x00000000. If MSR[IP] is 1, the base address | |
| 142 | * is 0xfff00000. In the case of a Power On Reset or Hard Reset, the value | |
| 143 | * of MSR[IP] is determined by the CIP field in the HRCW. | |
| 144 | * | |
| 145 | * Other bits in the HRCW set up the Base Address and Port Size in BR0. | |
| 146 | * This determines the location of the boot ROM (flash or EPROM) in the | |
| 147 | * processor's address space at boot time. As long as the HRCW is set up | |
| 148 | * so that we eventually end up executing the code below when the processor | |
| 149 | * executes the reset exception, the actual values used should not matter. | |
| 150 | * | |
| 151 | * Once we have got here, the address mask in OR0 is cleared so that the | |
| 152 | * bottom 32K of the boot ROM is effectively repeated all throughout the | |
| 153 | * processor's address space, after which we can jump to the absolute | |
| 154 | * address at which the boot ROM was linked at compile time, and proceed | |
| 155 | * to initialise the memory controller without worrying if the rug will be | |
| 156 | * pulled out from under us, so to speak (it will be fine as long as we | |
| 157 | * configure BR0 with the same boot ROM link address). | |
| 158 | */ | |
| 159 | . = EXC_OFF_SYS_RESET | |
| 160 | ||
| 161 | .globl _start | |
| 162 | _start: | |
| 163 | li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH*/ | |
| 48b42616 | 164 | nop |
| 47d1a6e1 WD |
165 | b boot_cold |
| 166 | ||
| 167 | . = EXC_OFF_SYS_RESET + 0x10 | |
| 168 | ||
| 169 | .globl _start_warm | |
| 170 | _start_warm: | |
| 171 | li r21, BOOTFLAG_WARM /* Software reboot */ | |
| 172 | b boot_warm | |
| 173 | ||
| 174 | boot_cold: | |
| 48b42616 WD |
175 | #if defined(CONFIG_MPC8260ADS) |
| 176 | lis r3, CFG_DEFAULT_IMMR@h | |
| 177 | nop | |
| 178 | lwz r4, 0(r3) | |
| 179 | nop | |
| 180 | rlwinm r4, r4, 0, 8, 5 | |
| 181 | nop | |
| 182 | oris r4, r4, 0x0200 | |
| 183 | nop | |
| 184 | stw r4, 0(r3) | |
| 185 | nop | |
| 186 | #endif /* CONFIG_MPC8260ADS */ | |
| 47d1a6e1 WD |
187 | boot_warm: |
| 188 | mfmsr r5 /* save msr contents */ | |
| 189 | ||
| 190 | #if defined(CONFIG_COGENT) | |
| 191 | /* this is what the cogent EPROM does */ | |
| 192 | li r0, 0 | |
| 193 | mtmsr r0 | |
| 194 | isync | |
| 195 | bl cogent_init_8260 | |
| 196 | #endif /* CONFIG_COGENT */ | |
| 197 | ||
| 198 | #if defined(CFG_DEFAULT_IMMR) | |
| 199 | lis r3, CFG_IMMR@h | |
| 200 | ori r3, r3, CFG_IMMR@l | |
| 201 | lis r4, CFG_DEFAULT_IMMR@h | |
| 202 | stw r3, 0x1A8(r4) | |
| 203 | #endif /* CFG_DEFAULT_IMMR */ | |
| 204 | ||
| 205 | /* Initialise the MPC8260 processor core */ | |
| 206 | /*--------------------------------------------------------------*/ | |
| 207 | ||
| 208 | bl init_8260_core | |
| 209 | ||
| 210 | #ifndef CFG_RAMBOOT | |
| 211 | /* When booting from ROM (Flash or EPROM), clear the */ | |
| 212 | /* Address Mask in OR0 so ROM appears everywhere */ | |
| 213 | /*--------------------------------------------------------------*/ | |
| 214 | ||
| 215 | lis r3, (CFG_IMMR+IM_REGBASE)@h | |
| 216 | lwz r4, IM_OR0@l(r3) | |
| 217 | li r5, 0x7fff | |
| 218 | and r4, r4, r5 | |
| 219 | stw r4, IM_OR0@l(r3) | |
| 220 | ||
| 221 | /* Calculate absolute address in FLASH and jump there */ | |
| 222 | /*--------------------------------------------------------------*/ | |
| 223 | ||
| 224 | lis r3, CFG_MONITOR_BASE@h | |
| 225 | ori r3, r3, CFG_MONITOR_BASE@l | |
| 226 | addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET | |
| 227 | mtlr r3 | |
| 228 | blr | |
| 229 | ||
| 230 | in_flash: | |
| 231 | #endif /* CFG_RAMBOOT */ | |
| 232 | ||
| 233 | /* initialize some things that are hard to access from C */ | |
| 234 | /*--------------------------------------------------------------*/ | |
| 235 | ||
| 236 | lis r3, CFG_IMMR@h /* set up stack in internal DPRAM */ | |
| 237 | ori r1, r3, CFG_INIT_SP_OFFSET | |
| 238 | li r0, 0 /* Make room for stack frame header and */ | |
| 239 | stwu r0, -4(r1) /* clear final stack frame so that */ | |
| 240 | stwu r0, -4(r1) /* stack backtraces terminate cleanly */ | |
| 241 | ||
| 242 | /* let the C-code set up the rest */ | |
| 243 | /* */ | |
| 244 | /* Be careful to keep code relocatable ! */ | |
| 245 | /*--------------------------------------------------------------*/ | |
| 246 | ||
| 247 | GET_GOT /* initialize GOT access */ | |
| 248 | ||
| 249 | /* r3: IMMR */ | |
| 250 | bl cpu_init_f /* run low-level CPU init code (in Flash)*/ | |
| 251 | ||
| 252 | #ifdef DEBUG | |
| 253 | bl init_debug /* set up debugging stuff */ | |
| 254 | #endif | |
| 255 | ||
| 256 | mr r3, r21 | |
| 257 | /* r3: BOOTFLAG */ | |
| 258 | bl board_init_f /* run 1st part of board init code (in Flash)*/ | |
| 259 | ||
| 260 | /* | |
| 261 | * Vector Table | |
| 262 | */ | |
| 263 | ||
| 264 | .globl _start_of_vectors | |
| 265 | _start_of_vectors: | |
| 266 | ||
| 267 | /* Machine check */ | |
| 268 | STD_EXCEPTION(0x200, MachineCheck, MachineCheckException) | |
| 269 | ||
| 270 | /* Data Storage exception. */ | |
| 271 | STD_EXCEPTION(0x300, DataStorage, UnknownException) | |
| 272 | ||
| 273 | /* Instruction Storage exception. */ | |
| 274 | STD_EXCEPTION(0x400, InstStorage, UnknownException) | |
| 275 | ||
| 276 | /* External Interrupt exception. */ | |
| 277 | STD_EXCEPTION(0x500, ExtInterrupt, external_interrupt) | |
| 278 | ||
| 279 | /* Alignment exception. */ | |
| 280 | . = 0x600 | |
| 281 | Alignment: | |
| 282 | EXCEPTION_PROLOG | |
| 283 | mfspr r4,DAR | |
| 284 | stw r4,_DAR(r21) | |
| 285 | mfspr r5,DSISR | |
| 286 | stw r5,_DSISR(r21) | |
| 287 | addi r3,r1,STACK_FRAME_OVERHEAD | |
| 288 | li r20,MSR_KERNEL | |
| 289 | rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ | |
| 290 | rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */ | |
| 291 | lwz r6,GOT(transfer_to_handler) | |
| 292 | mtlr r6 | |
| 293 | blrl | |
| 294 | .L_Alignment: | |
| 295 | .long AlignmentException - _start + EXC_OFF_SYS_RESET | |
| 296 | .long int_return - _start + EXC_OFF_SYS_RESET | |
| 297 | ||
| 298 | /* Program check exception */ | |
| 299 | . = 0x700 | |
| 300 | ProgramCheck: | |
| 301 | EXCEPTION_PROLOG | |
| 302 | addi r3,r1,STACK_FRAME_OVERHEAD | |
| 303 | li r20,MSR_KERNEL | |
| 304 | rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */ | |
| 305 | rlwimi r20,r23,0,25,25 /* copy IP bit from saved MSR */ | |
| 306 | lwz r6,GOT(transfer_to_handler) | |
| 307 | mtlr r6 | |
| 308 | blrl | |
| 309 | .L_ProgramCheck: | |
| 310 | .long ProgramCheckException - _start + EXC_OFF_SYS_RESET | |
| 311 | .long int_return - _start + EXC_OFF_SYS_RESET | |
| 312 | ||
| 313 | STD_EXCEPTION(0x800, FPUnavailable, UnknownException) | |
| 314 | ||
| 315 | /* I guess we could implement decrementer, and may have | |
| 316 | * to someday for timekeeping. | |
| 317 | */ | |
| 318 | STD_EXCEPTION(0x900, Decrementer, timer_interrupt) | |
| 319 | ||
| 320 | STD_EXCEPTION(0xa00, Trap_0a, UnknownException) | |
| 321 | STD_EXCEPTION(0xb00, Trap_0b, UnknownException) | |
| 322 | ||
| 323 | . = 0xc00 | |
| 324 | /* | |
| 325 | * r0 - SYSCALL number | |
| 326 | * r3-... arguments | |
| 327 | */ | |
| 328 | SystemCall: | |
| 329 | addis r11,r0,0 /* get functions table addr */ | |
| 330 | ori r11,r11,0 /* Note: this code is patched in trap_init */ | |
| 331 | addis r12,r0,0 /* get number of functions */ | |
| 332 | ori r12,r12,0 | |
| 333 | ||
| 334 | cmplw 0, r0, r12 | |
| 335 | bge 1f | |
| 336 | ||
| 337 | rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */ | |
| 338 | add r11,r11,r0 | |
| 339 | lwz r11,0(r11) | |
| 340 | ||
| 7c7a23bd WD |
341 | li r20,0xd00-4 /* Get stack pointer */ |
| 342 | lwz r12,0(r20) | |
| 343 | subi r12,r12,12 /* Adjust stack pointer */ | |
| 344 | li r0,0xc00+_end_back-SystemCall | |
| 345 | cmplw 0, r0, r12 /* Check stack overflow */ | |
| 346 | bgt 1f | |
| 347 | stw r12,0(r20) | |
| 348 | ||
| 47d1a6e1 WD |
349 | mflr r0 |
| 350 | stw r0,0(r12) | |
| 351 | mfspr r0,SRR0 | |
| 352 | stw r0,4(r12) | |
| 353 | mfspr r0,SRR1 | |
| 354 | stw r0,8(r12) | |
| 355 | ||
| 356 | li r12,0xc00+_back-SystemCall | |
| 357 | mtlr r12 | |
| 358 | mtspr SRR0,r11 | |
| 359 | ||
| 360 | 1: SYNC | |
| 361 | rfi | |
| 362 | ||
| 363 | _back: | |
| 364 | ||
| 365 | mfmsr r11 /* Disable interrupts */ | |
| 366 | li r12,0 | |
| 367 | ori r12,r12,MSR_EE | |
| 368 | andc r11,r11,r12 | |
| 369 | SYNC /* Some chip revs need this... */ | |
| 370 | mtmsr r11 | |
| 371 | SYNC | |
| 372 | ||
| 7c7a23bd WD |
373 | li r12,0xd00-4 /* restore regs */ |
| 374 | lwz r12,0(r12) | |
| 375 | ||
| 47d1a6e1 WD |
376 | lwz r11,0(r12) |
| 377 | mtlr r11 | |
| 378 | lwz r11,4(r12) | |
| 379 | mtspr SRR0,r11 | |
| 380 | lwz r11,8(r12) | |
| 381 | mtspr SRR1,r11 | |
| 382 | ||
| 7c7a23bd WD |
383 | addi r12,r12,12 /* Adjust stack pointer */ |
| 384 | li r20,0xd00-4 | |
| 385 | stw r12,0(r20) | |
| 386 | ||
| 47d1a6e1 WD |
387 | SYNC |
| 388 | rfi | |
| 7c7a23bd | 389 | _end_back: |
| 47d1a6e1 WD |
390 | |
| 391 | STD_EXCEPTION(0xd00, SingleStep, UnknownException) | |
| 392 | ||
| 393 | STD_EXCEPTION(0xe00, Trap_0e, UnknownException) | |
| 394 | STD_EXCEPTION(0xf00, Trap_0f, UnknownException) | |
| 395 | ||
| 396 | STD_EXCEPTION(0x1000, InstructionTLBMiss, UnknownException) | |
| 397 | STD_EXCEPTION(0x1100, DataLoadTLBMiss, UnknownException) | |
| 398 | STD_EXCEPTION(0x1200, DataStoreTLBMiss, UnknownException) | |
| 399 | #ifdef DEBUG | |
| 400 | . = 0x1300 | |
| 401 | /* | |
| 402 | * This exception occurs when the program counter matches the | |
| 403 | * Instruction Address Breakpoint Register (IABR). | |
| 404 | * | |
| 405 | * I want the cpu to halt if this occurs so I can hunt around | |
| 406 | * with the debugger and look at things. | |
| 407 | * | |
| 408 | * When DEBUG is defined, both machine check enable (in the MSR) | |
| 409 | * and checkstop reset enable (in the reset mode register) are | |
| 410 | * turned off and so a checkstop condition will result in the cpu | |
| 411 | * halting. | |
| 412 | * | |
| 413 | * I force the cpu into a checkstop condition by putting an illegal | |
| 414 | * instruction here (at least this is the theory). | |
| 415 | * | |
| 416 | * well - that didnt work, so just do an infinite loop! | |
| 417 | */ | |
| 418 | 1: b 1b | |
| 419 | #else | |
| 420 | STD_EXCEPTION(0x1300, InstructionBreakpoint, DebugException) | |
| 421 | #endif | |
| 422 | STD_EXCEPTION(0x1400, SMI, UnknownException) | |
| 423 | ||
| 424 | STD_EXCEPTION(0x1500, Trap_15, UnknownException) | |
| 425 | STD_EXCEPTION(0x1600, Trap_16, UnknownException) | |
| 426 | STD_EXCEPTION(0x1700, Trap_17, UnknownException) | |
| 427 | STD_EXCEPTION(0x1800, Trap_18, UnknownException) | |
| 428 | STD_EXCEPTION(0x1900, Trap_19, UnknownException) | |
| 429 | STD_EXCEPTION(0x1a00, Trap_1a, UnknownException) | |
| 430 | STD_EXCEPTION(0x1b00, Trap_1b, UnknownException) | |
| 431 | STD_EXCEPTION(0x1c00, Trap_1c, UnknownException) | |
| 432 | STD_EXCEPTION(0x1d00, Trap_1d, UnknownException) | |
| 433 | STD_EXCEPTION(0x1e00, Trap_1e, UnknownException) | |
| 434 | STD_EXCEPTION(0x1f00, Trap_1f, UnknownException) | |
| 435 | STD_EXCEPTION(0x2000, Trap_20, UnknownException) | |
| 436 | STD_EXCEPTION(0x2100, Trap_21, UnknownException) | |
| 437 | STD_EXCEPTION(0x2200, Trap_22, UnknownException) | |
| 438 | STD_EXCEPTION(0x2300, Trap_23, UnknownException) | |
| 439 | STD_EXCEPTION(0x2400, Trap_24, UnknownException) | |
| 440 | STD_EXCEPTION(0x2500, Trap_25, UnknownException) | |
| 441 | STD_EXCEPTION(0x2600, Trap_26, UnknownException) | |
| 442 | STD_EXCEPTION(0x2700, Trap_27, UnknownException) | |
| 443 | STD_EXCEPTION(0x2800, Trap_28, UnknownException) | |
| 444 | STD_EXCEPTION(0x2900, Trap_29, UnknownException) | |
| 445 | STD_EXCEPTION(0x2a00, Trap_2a, UnknownException) | |
| 446 | STD_EXCEPTION(0x2b00, Trap_2b, UnknownException) | |
| 447 | STD_EXCEPTION(0x2c00, Trap_2c, UnknownException) | |
| 448 | STD_EXCEPTION(0x2d00, Trap_2d, UnknownException) | |
| 449 | STD_EXCEPTION(0x2e00, Trap_2e, UnknownException) | |
| 450 | STD_EXCEPTION(0x2f00, Trap_2f, UnknownException) | |
| 451 | ||
| 452 | ||
| 453 | .globl _end_of_vectors | |
| 454 | _end_of_vectors: | |
| 455 | ||
| 456 | . = 0x3000 | |
| 457 | ||
| 458 | /* | |
| 459 | * This code finishes saving the registers to the exception frame | |
| 460 | * and jumps to the appropriate handler for the exception. | |
| 461 | * Register r21 is pointer into trap frame, r1 has new stack pointer. | |
| 462 | */ | |
| 463 | .globl transfer_to_handler | |
| 464 | transfer_to_handler: | |
| 465 | stw r22,_NIP(r21) | |
| 466 | lis r22,MSR_POW@h | |
| 467 | andc r23,r23,r22 | |
| 468 | stw r23,_MSR(r21) | |
| 469 | SAVE_GPR(7, r21) | |
| 470 | SAVE_4GPRS(8, r21) | |
| 471 | SAVE_8GPRS(12, r21) | |
| 472 | SAVE_8GPRS(24, r21) | |
| 473 | mflr r23 | |
| 474 | andi. r24,r23,0x3f00 /* get vector offset */ | |
| 475 | stw r24,TRAP(r21) | |
| 476 | li r22,0 | |
| 477 | stw r22,RESULT(r21) | |
| 478 | lwz r24,0(r23) /* virtual address of handler */ | |
| 479 | lwz r23,4(r23) /* where to go when done */ | |
| 480 | mtspr SRR0,r24 | |
| 481 | mtspr SRR1,r20 | |
| 482 | mtlr r23 | |
| 483 | SYNC | |
| 484 | rfi /* jump to handler, enable MMU */ | |
| 485 | ||
| 486 | int_return: | |
| 487 | mfmsr r28 /* Disable interrupts */ | |
| 488 | li r4,0 | |
| 489 | ori r4,r4,MSR_EE | |
| 490 | andc r28,r28,r4 | |
| 491 | SYNC /* Some chip revs need this... */ | |
| 492 | mtmsr r28 | |
| 493 | SYNC | |
| 494 | lwz r2,_CTR(r1) | |
| 495 | lwz r0,_LINK(r1) | |
| 496 | mtctr r2 | |
| 497 | mtlr r0 | |
| 498 | lwz r2,_XER(r1) | |
| 499 | lwz r0,_CCR(r1) | |
| 500 | mtspr XER,r2 | |
| 501 | mtcrf 0xFF,r0 | |
| 502 | REST_10GPRS(3, r1) | |
| 503 | REST_10GPRS(13, r1) | |
| 504 | REST_8GPRS(23, r1) | |
| 505 | REST_GPR(31, r1) | |
| 506 | lwz r2,_NIP(r1) /* Restore environment */ | |
| 507 | lwz r0,_MSR(r1) | |
| 508 | mtspr SRR0,r2 | |
| 509 | mtspr SRR1,r0 | |
| 510 | lwz r0,GPR0(r1) | |
| 511 | lwz r2,GPR2(r1) | |
| 512 | lwz r1,GPR1(r1) | |
| 513 | SYNC | |
| 514 | rfi | |
| 515 | ||
| 516 | #if defined(CONFIG_COGENT) | |
| 517 | ||
| 518 | /* | |
| 519 | * This code initialises the MPC8260 processor core | |
| 520 | * (conforms to PowerPC 603e spec) | |
| 521 | */ | |
| 522 | ||
| 523 | .globl cogent_init_8260 | |
| 524 | cogent_init_8260: | |
| 525 | ||
| 526 | /* Taken from page 14 of CMA282 manual */ | |
| 527 | /*--------------------------------------------------------------*/ | |
| 528 | ||
| 529 | lis r4, (CFG_IMMR+IM_REGBASE)@h | |
| 530 | lis r3, CFG_IMMR@h | |
| 531 | stw r3, IM_IMMR@l(r4) | |
| 532 | lwz r3, IM_IMMR@l(r4) | |
| 533 | stw r3, 0(r0) | |
| 534 | lis r3, CFG_SYPCR@h | |
| 535 | ori r3, r3, CFG_SYPCR@l | |
| 536 | stw r3, IM_SYPCR@l(r4) | |
| 537 | lwz r3, IM_SYPCR@l(r4) | |
| 538 | stw r3, 4(r0) | |
| 539 | lis r3, CFG_SCCR@h | |
| 540 | ori r3, r3, CFG_SCCR@l | |
| 541 | stw r3, IM_SCCR@l(r4) | |
| 542 | lwz r3, IM_SCCR@l(r4) | |
| 543 | stw r3, 8(r0) | |
| 544 | ||
| 545 | /* the rest of this was disassembled from the */ | |
| 546 | /* EPROM code that came with my CMA282 CPU module */ | |
| 547 | /*--------------------------------------------------------------*/ | |
| 548 | ||
| 549 | lis r1, 0x1234 | |
| 550 | ori r1, r1, 0x5678 | |
| 551 | stw r1, 0x20(r0) | |
| 552 | lwz r1, 0x20(r0) | |
| 553 | stw r1, 0x24(r0) | |
| 554 | lwz r1, 0x24(r0) | |
| 555 | lis r3, 0x0e80 | |
| 556 | ori r3, r3, 0 | |
| 557 | stw r1, 4(r3) | |
| 558 | lwz r1, 4(r3) | |
| 559 | ||
| 560 | /* Done! */ | |
| 561 | /*--------------------------------------------------------------*/ | |
| 562 | ||
| 563 | blr | |
| 564 | ||
| 565 | #endif /* CONFIG_COGENT */ | |
| 566 | ||
| 567 | /* | |
| 568 | * This code initialises the MPC8260 processor core | |
| 569 | * (conforms to PowerPC 603e spec) | |
| 570 | * Note: expects original MSR contents to be in r5. | |
| 571 | */ | |
| 572 | ||
| 573 | .globl init_8260_core | |
| 574 | init_8260_core: | |
| 575 | ||
| 576 | /* Initialize machine status; enable machine check interrupt */ | |
| 577 | /*--------------------------------------------------------------*/ | |
| 578 | ||
| 579 | li r3, MSR_KERNEL /* Set ME and RI flags */ | |
| 580 | rlwimi r3, r5, 0, 25, 25 /* preserve IP bit set by HRCW */ | |
| 581 | #ifdef DEBUG | |
| 582 | rlwimi r3, r5, 0, 21, 22 /* debugger might set SE & BE bits */ | |
| 583 | #endif | |
| 584 | SYNC /* Some chip revs need this... */ | |
| 585 | mtmsr r3 | |
| 586 | SYNC | |
| 587 | mtspr SRR1, r3 /* Make SRR1 match MSR */ | |
| 588 | ||
| 589 | /* Initialise the SYPCR early, and reset the watchdog (if req) */ | |
| 590 | /*--------------------------------------------------------------*/ | |
| 591 | ||
| 592 | lis r3, (CFG_IMMR+IM_REGBASE)@h | |
| 593 | #if !defined(CONFIG_COGENT) | |
| 594 | lis r4, CFG_SYPCR@h | |
| 595 | ori r4, r4, CFG_SYPCR@l | |
| 596 | stw r4, IM_SYPCR@l(r3) | |
| 597 | #endif /* !CONFIG_COGENT */ | |
| 598 | #if defined(CONFIG_WATCHDOG) | |
| 599 | li r4, 21868 /* = 0x556c */ | |
| 600 | sth r4, IM_SWSR@l(r3) | |
| 601 | li r4, -21959 /* = 0xaa39 */ | |
| 602 | sth r4, IM_SWSR@l(r3) | |
| 603 | #endif /* CONFIG_WATCHDOG */ | |
| 604 | ||
| 605 | /* Initialize the Hardware Implementation-dependent Registers */ | |
| 606 | /* HID0 also contains cache control */ | |
| 607 | /*--------------------------------------------------------------*/ | |
| 608 | ||
| 609 | lis r3, CFG_HID0_INIT@h | |
| 610 | ori r3, r3, CFG_HID0_INIT@l | |
| 611 | SYNC | |
| 612 | mtspr HID0, r3 | |
| 613 | ||
| 614 | lis r3, CFG_HID0_FINAL@h | |
| 615 | ori r3, r3, CFG_HID0_FINAL@l | |
| 616 | SYNC | |
| 617 | mtspr HID0, r3 | |
| 618 | ||
| 619 | lis r3, CFG_HID2@h | |
| 620 | ori r3, r3, CFG_HID2@l | |
| 621 | mtspr HID2, r3 | |
| 622 | ||
| 623 | /* clear all BAT's */ | |
| 624 | /*--------------------------------------------------------------*/ | |
| 625 | ||
| 626 | li r0, 0 | |
| 627 | mtspr DBAT0U, r0 | |
| 628 | mtspr DBAT0L, r0 | |
| 629 | mtspr DBAT1U, r0 | |
| 630 | mtspr DBAT1L, r0 | |
| 631 | mtspr DBAT2U, r0 | |
| 632 | mtspr DBAT2L, r0 | |
| 633 | mtspr DBAT3U, r0 | |
| 634 | mtspr DBAT3L, r0 | |
| 635 | mtspr IBAT0U, r0 | |
| 636 | mtspr IBAT0L, r0 | |
| 637 | mtspr IBAT1U, r0 | |
| 638 | mtspr IBAT1L, r0 | |
| 639 | mtspr IBAT2U, r0 | |
| 640 | mtspr IBAT2L, r0 | |
| 641 | mtspr IBAT3U, r0 | |
| 642 | mtspr IBAT3L, r0 | |
| 643 | SYNC | |
| 644 | ||
| 645 | /* invalidate all tlb's */ | |
| 646 | /* */ | |
| 647 | /* From the 603e User Manual: "The 603e provides the ability to */ | |
| 648 | /* invalidate a TLB entry. The TLB Invalidate Entry (tlbie) */ | |
| 649 | /* instruction invalidates the TLB entry indexed by the EA, and */ | |
| 650 | /* operates on both the instruction and data TLBs simultaneously*/ | |
| 651 | /* invalidating four TLB entries (both sets in each TLB). The */ | |
| 652 | /* index corresponds to bits 15-19 of the EA. To invalidate all */ | |
| 653 | /* entries within both TLBs, 32 tlbie instructions should be */ | |
| 654 | /* issued, incrementing this field by one each time." */ | |
| 655 | /* */ | |
| 656 | /* "Note that the tlbia instruction is not implemented on the */ | |
| 657 | /* 603e." */ | |
| 658 | /* */ | |
| 659 | /* bits 15-19 correspond to addresses 0x00000000 to 0x0001F000 */ | |
| 660 | /* incrementing by 0x1000 each time. The code below is sort of */ | |
| 661 | /* based on code in "flush_tlbs" from arch/ppc/kernel/head.S */ | |
| 662 | /* */ | |
| 663 | /*--------------------------------------------------------------*/ | |
| 664 | ||
| 665 | li r3, 32 | |
| 666 | mtctr r3 | |
| 667 | li r3, 0 | |
| 668 | 1: tlbie r3 | |
| 669 | addi r3, r3, 0x1000 | |
| 670 | bdnz 1b | |
| 671 | SYNC | |
| 672 | ||
| 673 | /* Done! */ | |
| 674 | /*--------------------------------------------------------------*/ | |
| 675 | ||
| 676 | blr | |
| 677 | ||
| 678 | #ifdef DEBUG | |
| 679 | ||
| 680 | /* | |
| 681 | * initialise things related to debugging. | |
| 682 | * | |
| 683 | * must be called after the global offset table (GOT) is initialised | |
| 684 | * (GET_GOT) and after cpu_init_f() has executed. | |
| 685 | */ | |
| 686 | ||
| 687 | .globl init_debug | |
| 688 | init_debug: | |
| 689 | ||
| 690 | lis r3, (CFG_IMMR+IM_REGBASE)@h | |
| 691 | ||
| 692 | /* Quick and dirty hack to enable the RAM and copy the */ | |
| 693 | /* vectors so that we can take exceptions. */ | |
| 694 | /*--------------------------------------------------------------*/ | |
| 695 | /* write Memory Refresh Prescaler */ | |
| 696 | li r4, CFG_MPTPR | |
| 697 | sth r4, IM_MPTPR@l(r3) | |
| 698 | /* write 60x Refresh Timer */ | |
| 699 | li r4, CFG_PSRT | |
| 700 | stb r4, IM_PSRT@l(r3) | |
| 701 | /* init the 60x SDRAM Mode Register */ | |
| 702 | lis r4, (CFG_PSDMR|PSDMR_OP_NORM)@h | |
| 703 | ori r4, r4, (CFG_PSDMR|PSDMR_OP_NORM)@l | |
| 704 | stw r4, IM_PSDMR@l(r3) | |
| 705 | /* write Precharge All Banks command */ | |
| 706 | lis r4, (CFG_PSDMR|PSDMR_OP_PREA)@h | |
| 707 | ori r4, r4, (CFG_PSDMR|PSDMR_OP_PREA)@l | |
| 708 | stw r4, IM_PSDMR@l(r3) | |
| 709 | stb r0, 0(0) | |
| 710 | /* write eight CBR Refresh commands */ | |
| 711 | lis r4, (CFG_PSDMR|PSDMR_OP_CBRR)@h | |
| 712 | ori r4, r4, (CFG_PSDMR|PSDMR_OP_CBRR)@l | |
| 713 | stw r4, IM_PSDMR@l(r3) | |
| 714 | stb r0, 0(0) | |
| 715 | stb r0, 0(0) | |
| 716 | stb r0, 0(0) | |
| 717 | stb r0, 0(0) | |
| 718 | stb r0, 0(0) | |
| 719 | stb r0, 0(0) | |
| 720 | stb r0, 0(0) | |
| 721 | stb r0, 0(0) | |
| 722 | /* write Mode Register Write command */ | |
| 723 | lis r4, (CFG_PSDMR|PSDMR_OP_MRW)@h | |
| 724 | ori r4, r4, (CFG_PSDMR|PSDMR_OP_MRW)@l | |
| 725 | stw r4, IM_PSDMR@l(r3) | |
| 726 | stb r0, 0(0) | |
| 727 | /* write Normal Operation command and enable Refresh */ | |
| 728 | lis r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@h | |
| 729 | ori r4, r4, (CFG_PSDMR|PSDMR_OP_NORM|PSDMR_RFEN)@l | |
| 730 | stw r4, IM_PSDMR@l(r3) | |
| 731 | stb r0, 0(0) | |
| 732 | /* RAM should now be operational */ | |
| 733 | ||
| 734 | #define VEC_WRD_CNT ((_end_of_vectors - _start + EXC_OFF_SYS_RESET) / 4) | |
| 735 | ||
| 736 | lwz r3, GOT(_end_of_vectors) | |
| 737 | rlwinm r4, r3, 0, 18, 31 /* _end_of_vectors & 0x3FFF */ | |
| 738 | lis r5, VEC_WRD_CNT@h | |
| 739 | ori r5, r5, VEC_WRD_CNT@l | |
| 740 | mtctr r5 | |
| 741 | 1: | |
| 742 | lwzu r5, -4(r3) | |
| 743 | stwu r5, -4(r4) | |
| 744 | bdnz 1b | |
| 745 | ||
| 746 | /* Load the Instruction Address Breakpoint Register (IABR). */ | |
| 747 | /* */ | |
| 748 | /* The address to load is stored in the first word of dual port */ | |
| 749 | /* ram and should be preserved while the power is on, so you */ | |
| 750 | /* can plug addresses into that location then reset the cpu and */ | |
| 751 | /* this code will load that address into the IABR after the */ | |
| 752 | /* reset. */ | |
| 753 | /* */ | |
| 754 | /* When the program counter matches the contents of the IABR, */ | |
| 755 | /* an exception is generated (before the instruction at that */ | |
| 756 | /* location completes). The vector for this exception is 0x1300 */ | |
| 757 | /*--------------------------------------------------------------*/ | |
| 758 | lis r3, CFG_IMMR@h | |
| 759 | lwz r3, 0(r3) | |
| 760 | mtspr IABR, r3 | |
| 761 | ||
| 762 | /* Set the entire dual port RAM (where the initial stack */ | |
| 763 | /* resides) to a known value - makes it easier to see where */ | |
| 764 | /* the stack has been written */ | |
| 765 | /*--------------------------------------------------------------*/ | |
| 766 | lis r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@h | |
| 767 | ori r3, r3, (CFG_IMMR + CFG_INIT_SP_OFFSET)@l | |
| 768 | li r4, ((CFG_INIT_SP_OFFSET - 4) / 4) | |
| 769 | mtctr r4 | |
| 770 | lis r4, 0xdeadbeaf@h | |
| 771 | ori r4, r4, 0xdeadbeaf@l | |
| 772 | 1: | |
| 773 | stwu r4, -4(r3) | |
| 774 | bdnz 1b | |
| 775 | ||
| 776 | /* Done! */ | |
| 777 | /*--------------------------------------------------------------*/ | |
| 778 | ||
| 779 | blr | |
| 780 | #endif | |
| 781 | ||
| 782 | /* Cache functions. | |
| 783 | * | |
| 784 | * Note: requires that all cache bits in | |
| 785 | * HID0 are in the low half word. | |
| 786 | */ | |
| 787 | .globl icache_enable | |
| 788 | icache_enable: | |
| 789 | mfspr r3, HID0 | |
| 790 | ori r3, r3, HID0_ICE | |
| 791 | lis r4, 0 | |
| 792 | ori r4, r4, HID0_ILOCK | |
| 793 | andc r3, r3, r4 | |
| 794 | ori r4, r3, HID0_ICFI | |
| 795 | isync | |
| 796 | mtspr HID0, r4 /* sets enable and invalidate, clears lock */ | |
| 797 | isync | |
| 798 | mtspr HID0, r3 /* clears invalidate */ | |
| 799 | blr | |
| 800 | ||
| 801 | .globl icache_disable | |
| 802 | icache_disable: | |
| 803 | mfspr r3, HID0 | |
| 804 | lis r4, 0 | |
| 805 | ori r4, r4, HID0_ICE|HID0_ILOCK | |
| 806 | andc r3, r3, r4 | |
| 807 | ori r4, r3, HID0_ICFI | |
| 808 | isync | |
| 809 | mtspr HID0, r4 /* sets invalidate, clears enable and lock */ | |
| 810 | isync | |
| 811 | mtspr HID0, r3 /* clears invalidate */ | |
| 812 | blr | |
| 813 | ||
| 814 | .globl icache_status | |
| 815 | icache_status: | |
| 816 | mfspr r3, HID0 | |
| 817 | rlwinm r3, r3, HID0_ICE_BITPOS + 1, 31, 31 | |
| 818 | blr | |
| 819 | ||
| 820 | .globl dcache_enable | |
| 821 | dcache_enable: | |
| 822 | mfspr r3, HID0 | |
| 823 | ori r3, r3, HID0_DCE | |
| 824 | lis r4, 0 | |
| 825 | ori r4, r4, HID0_DLOCK | |
| 826 | andc r3, r3, r4 | |
| 827 | ori r4, r3, HID0_DCI | |
| 828 | sync | |
| 829 | mtspr HID0, r4 /* sets enable and invalidate, clears lock */ | |
| 830 | sync | |
| 831 | mtspr HID0, r3 /* clears invalidate */ | |
| 832 | blr | |
| 833 | ||
| 834 | .globl dcache_disable | |
| 835 | dcache_disable: | |
| 836 | mfspr r3, HID0 | |
| 837 | lis r4, 0 | |
| 838 | ori r4, r4, HID0_DCE|HID0_DLOCK | |
| 839 | andc r3, r3, r4 | |
| 840 | ori r4, r3, HID0_DCI | |
| 841 | sync | |
| 842 | mtspr HID0, r4 /* sets invalidate, clears enable and lock */ | |
| 843 | sync | |
| 844 | mtspr HID0, r3 /* clears invalidate */ | |
| 845 | blr | |
| 846 | ||
| 847 | .globl dcache_status | |
| 848 | dcache_status: | |
| 849 | mfspr r3, HID0 | |
| 850 | rlwinm r3, r3, HID0_DCE_BITPOS + 1, 31, 31 | |
| 851 | blr | |
| 852 | ||
| 853 | .globl get_pvr | |
| 854 | get_pvr: | |
| 855 | mfspr r3, PVR | |
| 856 | blr | |
| 857 | ||
| 858 | /*------------------------------------------------------------------------------*/ | |
| 859 | ||
| 860 | /* | |
| 861 | * void relocate_code (addr_sp, gd, addr_moni) | |
| 862 | * | |
| 863 | * This "function" does not return, instead it continues in RAM | |
| 864 | * after relocating the monitor code. | |
| 865 | * | |
| 866 | * r3 = dest | |
| 867 | * r4 = src | |
| 868 | * r5 = length in bytes | |
| 869 | * r6 = cachelinesize | |
| 870 | */ | |
| 871 | .globl relocate_code | |
| 872 | relocate_code: | |
| 873 | mr r1, r3 /* Set new stack pointer */ | |
| 874 | mr r9, r4 /* Save copy of Global Data pointer */ | |
| 875 | mr r10, r5 /* Save copy of Destination Address */ | |
| 876 | ||
| 877 | mr r3, r5 /* Destination Address */ | |
| 878 | lis r4, CFG_MONITOR_BASE@h /* Source Address */ | |
| 879 | ori r4, r4, CFG_MONITOR_BASE@l | |
| 3b57fe0a WD |
880 | lwz r5, GOT(__init_end) |
| 881 | sub r5, r5, r4 | |
| 47d1a6e1 WD |
882 | li r6, CFG_CACHELINE_SIZE /* Cache Line Size */ |
| 883 | ||
| 884 | /* | |
| 885 | * Fix GOT pointer: | |
| 886 | * | |
| 887 | * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address | |
| 888 | * | |
| 889 | * Offset: | |
| 890 | */ | |
| 891 | sub r15, r10, r4 | |
| 892 | ||
| 893 | /* First our own GOT */ | |
| 894 | add r14, r14, r15 | |
| 895 | /* then the one used by the C code */ | |
| 896 | add r30, r30, r15 | |
| 897 | ||
| 898 | /* | |
| 899 | * Now relocate code | |
| 900 | */ | |
| 901 | ||
| 902 | cmplw cr1,r3,r4 | |
| 903 | addi r0,r5,3 | |
| 904 | srwi. r0,r0,2 | |
| 905 | beq cr1,4f /* In place copy is not necessary */ | |
| 906 | beq 7f /* Protect against 0 count */ | |
| 907 | mtctr r0 | |
| 908 | bge cr1,2f | |
| 909 | ||
| 910 | la r8,-4(r4) | |
| 911 | la r7,-4(r3) | |
| 912 | 1: lwzu r0,4(r8) | |
| 913 | stwu r0,4(r7) | |
| 914 | bdnz 1b | |
| 915 | b 4f | |
| 916 | ||
| 917 | 2: slwi r0,r0,2 | |
| 918 | add r8,r4,r0 | |
| 919 | add r7,r3,r0 | |
| 920 | 3: lwzu r0,-4(r8) | |
| 921 | stwu r0,-4(r7) | |
| 922 | bdnz 3b | |
| 923 | ||
| 924 | /* | |
| 925 | * Now flush the cache: note that we must start from a cache aligned | |
| 926 | * address. Otherwise we might miss one cache line. | |
| 927 | */ | |
| 928 | 4: cmpwi r6,0 | |
| 929 | add r5,r3,r5 | |
| 930 | beq 7f /* Always flush prefetch queue in any case */ | |
| 931 | subi r0,r6,1 | |
| 932 | andc r3,r3,r0 | |
| 933 | mfspr r7,HID0 /* don't do dcbst if dcache is disabled */ | |
| 934 | rlwinm r7,r7,HID0_DCE_BITPOS+1,31,31 | |
| 935 | cmpwi r7,0 | |
| 936 | beq 9f | |
| 937 | mr r4,r3 | |
| 938 | 5: dcbst 0,r4 | |
| 939 | add r4,r4,r6 | |
| 940 | cmplw r4,r5 | |
| 941 | blt 5b | |
| 942 | sync /* Wait for all dcbst to complete on bus */ | |
| 943 | 9: mfspr r7,HID0 /* don't do icbi if icache is disabled */ | |
| 944 | rlwinm r7,r7,HID0_ICE_BITPOS+1,31,31 | |
| 945 | cmpwi r7,0 | |
| 946 | beq 7f | |
| 947 | mr r4,r3 | |
| 948 | 6: icbi 0,r4 | |
| 949 | add r4,r4,r6 | |
| 950 | cmplw r4,r5 | |
| 951 | blt 6b | |
| 952 | 7: sync /* Wait for all icbi to complete on bus */ | |
| 953 | isync | |
| 954 | ||
| 955 | /* | |
| 956 | * We are done. Do not return, instead branch to second part of board | |
| 957 | * initialization, now running from RAM. | |
| 958 | */ | |
| 959 | ||
| 960 | addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET | |
| 961 | mtlr r0 | |
| 962 | blr | |
| 963 | ||
| 964 | in_ram: | |
| 965 | ||
| 966 | /* | |
| 967 | * Relocation Function, r14 point to got2+0x8000 | |
| 968 | * | |
| 8bde7f77 WD |
969 | * Adjust got2 pointers, no need to check for 0, this code |
| 970 | * already puts a few entries in the table. | |
| 47d1a6e1 WD |
971 | */ |
| 972 | li r0,__got2_entries@sectoff@l | |
| 973 | la r3,GOT(_GOT2_TABLE_) | |
| 974 | lwz r11,GOT(_GOT2_TABLE_) | |
| 975 | mtctr r0 | |
| 976 | sub r11,r3,r11 | |
| 977 | addi r3,r3,-4 | |
| 978 | 1: lwzu r0,4(r3) | |
| 979 | add r0,r0,r11 | |
| 980 | stw r0,0(r3) | |
| 981 | bdnz 1b | |
| 982 | ||
| 983 | /* | |
| 8bde7f77 | 984 | * Now adjust the fixups and the pointers to the fixups |
| 47d1a6e1 WD |
985 | * in case we need to move ourselves again. |
| 986 | */ | |
| 987 | 2: li r0,__fixup_entries@sectoff@l | |
| 988 | lwz r3,GOT(_FIXUP_TABLE_) | |
| 989 | cmpwi r0,0 | |
| 990 | mtctr r0 | |
| 991 | addi r3,r3,-4 | |
| 992 | beq 4f | |
| 993 | 3: lwzu r4,4(r3) | |
| 994 | lwzux r0,r4,r11 | |
| 995 | add r0,r0,r11 | |
| 996 | stw r10,0(r3) | |
| 997 | stw r0,0(r4) | |
| 998 | bdnz 3b | |
| 999 | 4: | |
| 1000 | clear_bss: | |
| 1001 | /* | |
| 1002 | * Now clear BSS segment | |
| 1003 | */ | |
| 5d232d0e | 1004 | lwz r3,GOT(__bss_start) |
| 47d1a6e1 WD |
1005 | #if defined(CONFIG_HYMOD) |
| 1006 | /* | |
| 1007 | * For HYMOD - the environment is the very last item in flash. | |
| 1008 | * The real .bss stops just before environment starts, so only | |
| 1009 | * clear up to that point. | |
| 1010 | * | |
| 1011 | * taken from mods for FADS board | |
| 1012 | */ | |
| 1013 | lwz r4,GOT(environment) | |
| 1014 | #else | |
| 1015 | lwz r4,GOT(_end) | |
| 1016 | #endif | |
| 1017 | ||
| 1018 | cmplw 0, r3, r4 | |
| 1019 | beq 6f | |
| 1020 | ||
| 1021 | li r0, 0 | |
| 1022 | 5: | |
| 1023 | stw r0, 0(r3) | |
| 1024 | addi r3, r3, 4 | |
| 1025 | cmplw 0, r3, r4 | |
| 1026 | bne 5b | |
| 1027 | 6: | |
| 1028 | ||
| 1029 | mr r3, r9 /* Global Data pointer */ | |
| 1030 | mr r4, r10 /* Destination Address */ | |
| 1031 | bl board_init_r | |
| 1032 | ||
| 47d1a6e1 WD |
1033 | /* |
| 1034 | * Copy exception vector code to low memory | |
| 1035 | * | |
| 1036 | * r3: dest_addr | |
| 1037 | * r7: source address, r8: end address, r9: target address | |
| 1038 | */ | |
| 1039 | .globl trap_init | |
| 1040 | trap_init: | |
| 1041 | lwz r7, GOT(_start) | |
| 1042 | lwz r8, GOT(_end_of_vectors) | |
| 1043 | ||
| 682011ff | 1044 | li r9, 0x100 /* reset vector always at 0x100 */ |
| 47d1a6e1 WD |
1045 | |
| 1046 | cmplw 0, r7, r8 | |
| 1047 | bgelr /* return if r7>=r8 - just in case */ | |
| 1048 | ||
| 1049 | mflr r4 /* save link register */ | |
| 1050 | 1: | |
| 1051 | lwz r0, 0(r7) | |
| 1052 | stw r0, 0(r9) | |
| 1053 | addi r7, r7, 4 | |
| 1054 | addi r9, r9, 4 | |
| 1055 | cmplw 0, r7, r8 | |
| 1056 | bne 1b | |
| 1057 | ||
| 1058 | /* | |
| 1059 | * relocate `hdlr' and `int_return' entries | |
| 1060 | */ | |
| 1061 | li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET | |
| 1062 | li r8, Alignment - _start + EXC_OFF_SYS_RESET | |
| 1063 | 2: | |
| 1064 | bl trap_reloc | |
| 1065 | addi r7, r7, 0x100 /* next exception vector */ | |
| 1066 | cmplw 0, r7, r8 | |
| 1067 | blt 2b | |
| 1068 | ||
| 1069 | li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET | |
| 1070 | bl trap_reloc | |
| 1071 | ||
| 1072 | li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET | |
| 1073 | bl trap_reloc | |
| 1074 | ||
| 1075 | li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET | |
| 1076 | li r8, SystemCall - _start + EXC_OFF_SYS_RESET | |
| 1077 | 3: | |
| 1078 | bl trap_reloc | |
| 1079 | addi r7, r7, 0x100 /* next exception vector */ | |
| 1080 | cmplw 0, r7, r8 | |
| 1081 | blt 3b | |
| 1082 | ||
| 1083 | li r7, .L_SingleStep - _start + EXC_OFF_SYS_RESET | |
| 1084 | li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET | |
| 1085 | 4: | |
| 1086 | bl trap_reloc | |
| 1087 | addi r7, r7, 0x100 /* next exception vector */ | |
| 1088 | cmplw 0, r7, r8 | |
| 1089 | blt 4b | |
| 1090 | ||
| 1091 | mfmsr r3 /* now that the vectors have */ | |
| 1092 | lis r7, MSR_IP@h /* relocated into low memory */ | |
| 1093 | ori r7, r7, MSR_IP@l /* MSR[IP] can be turned off */ | |
| 1094 | andc r3, r3, r7 /* (if it was on) */ | |
| 1095 | SYNC /* Some chip revs need this... */ | |
| 1096 | mtmsr r3 | |
| 1097 | SYNC | |
| 1098 | ||
| 1099 | mtlr r4 /* restore link register */ | |
| 1100 | blr | |
| 1101 | ||
| 1102 | /* | |
| 1103 | * Function: relocate entries for one exception vector | |
| 1104 | */ | |
| 1105 | trap_reloc: | |
| 1106 | lwz r0, 0(r7) /* hdlr ... */ | |
| 1107 | add r0, r0, r3 /* ... += dest_addr */ | |
| 1108 | stw r0, 0(r7) | |
| 1109 | ||
| 1110 | lwz r0, 4(r7) /* int_return ... */ | |
| 1111 | add r0, r0, r3 /* ... += dest_addr */ | |
| 1112 | stw r0, 4(r7) | |
| 1113 | ||
| 1114 | blr |