1/* 2 * armboot - Startup Code for ARM1176 CPU-core 3 * 4 * Copyright (c) 2007 Samsung Electronics 5 * 6 * Copyright (C) 2008 7 * Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de> 8 * 9 * See file CREDITS for list of people who contributed to this 10 * project. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License as 14 * published by the Free Software Foundation; either version 2 of 15 * the License, or (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 25 * MA 02111-1307 USA 26 * 27 * 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com) 28 * 2007-09-21 - Added MoviNAND and OneNAND boot codes by 29 * jsgood (jsgood.yang@samsung.com) 30 * Base codes by scsuh (sc.suh) 31 */ 32 33#include <asm-offsets.h> 34#include <config.h> 35#include <version.h> 36#ifdef CONFIG_ENABLE_MMU 37#include <asm/proc/domain.h> 38#endif 39 40#if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE) 41#define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE 42#endif 43 44/* 45 ************************************************************************* 46 * 47 * Jump vector table as in table 3.1 in [1] 48 * 49 ************************************************************************* 50 */ 51 52.globl _start 53_start: b reset 54#ifndef CONFIG_NAND_SPL 55 ldr pc, _undefined_instruction 56 ldr pc, _software_interrupt 57 ldr pc, _prefetch_abort 58 ldr pc, _data_abort 59 ldr pc, _not_used 60 ldr pc, _irq 61 ldr pc, _fiq 62 63_undefined_instruction: 64 .word undefined_instruction 65_software_interrupt: 66 .word software_interrupt 67_prefetch_abort: 68 .word prefetch_abort 69_data_abort: 70 .word data_abort 71_not_used: 72 .word not_used 73_irq: 74 .word irq 75_fiq: 76 .word fiq 77_pad: 78 .word 0x12345678 /* now 16*4=64 */ 79#else 80 . = _start + 64 81#endif 82 83.global _end_vect 84_end_vect: 85 .balignl 16,0xdeadbeef 86/* 87 ************************************************************************* 88 * 89 * Startup Code (reset vector) 90 * 91 * do important init only if we don't start from memory! 92 * setup Memory and board specific bits prior to relocation. 93 * relocate armboot to ram 94 * setup stack 95 * 96 ************************************************************************* 97 */ 98 99.globl _TEXT_BASE 100_TEXT_BASE: 101 .word CONFIG_SYS_TEXT_BASE 102 103/* 104 * Below variable is very important because we use MMU in U-Boot. 105 * Without it, we cannot run code correctly before MMU is ON. 106 * by scsuh. 107 */ 108_TEXT_PHY_BASE: 109 .word CONFIG_SYS_PHY_UBOOT_BASE 110 111/* 112 * These are defined in the board-specific linker script. 113 * Subtracting _start from them lets the linker put their 114 * relative position in the executable instead of leaving 115 * them null. 116 */ 117 118.globl _bss_start_ofs 119_bss_start_ofs: 120 .word __bss_start - _start 121 122.globl _bss_end_ofs 123_bss_end_ofs: 124 .word __bss_end__ - _start 125 126.globl _end_ofs 127_end_ofs: 128 .word _end - _start 129 130/* IRQ stack memory (calculated at run-time) + 8 bytes */ 131.globl IRQ_STACK_START_IN 132IRQ_STACK_START_IN: 133 .word 0x0badc0de 134 135/* 136 * the actual reset code 137 */ 138 139reset: 140 /* 141 * set the cpu to SVC32 mode 142 */ 143 mrs r0, cpsr 144 bic r0, r0, #0x3f 145 orr r0, r0, #0xd3 146 msr cpsr, r0 147 148/* 149 ************************************************************************* 150 * 151 * CPU_init_critical registers 152 * 153 * setup important registers 154 * setup memory timing 155 * 156 ************************************************************************* 157 */ 158 /* 159 * we do sys-critical inits only at reboot, 160 * not when booting from ram! 161 */ 162cpu_init_crit: 163 /* 164 * When booting from NAND - it has definitely been a reset, so, no need 165 * to flush caches and disable the MMU 166 */ 167#ifndef CONFIG_NAND_SPL 168 /* 169 * flush v4 I/D caches 170 */ 171 mov r0, #0 172 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ 173 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ 174 175 /* 176 * disable MMU stuff and caches 177 */ 178 mrc p15, 0, r0, c1, c0, 0 179 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS) 180 bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM) 181 orr r0, r0, #0x00000002 @ set bit 2 (A) Align 182 orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache 183 184 /* Prepare to disable the MMU */ 185 adr r2, mmu_disable_phys 186 sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - CONFIG_SYS_TEXT_BASE) 187 b mmu_disable 188 189 .align 5 190 /* Run in a single cache-line */ 191mmu_disable: 192 mcr p15, 0, r0, c1, c0, 0 193 nop 194 nop 195 mov pc, r2 196mmu_disable_phys: 197 198#ifdef CONFIG_DISABLE_TCM 199 /* 200 * Disable the TCMs 201 */ 202 mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */ 203 cmp r0, #0 204 beq skip_tcmdisable 205 mov r1, #0 206 mov r2, #1 207 tst r0, r2 208 mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/ 209 tst r0, r2, LSL #16 210 mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/ 211skip_tcmdisable: 212#endif 213#endif 214 215#ifdef CONFIG_PERIPORT_REMAP 216 /* Peri port setup */ 217 ldr r0, =CONFIG_PERIPORT_BASE 218 orr r0, r0, #CONFIG_PERIPORT_SIZE 219 mcr p15,0,r0,c15,c2,4 220#endif 221 222 /* 223 * Go setup Memory and board specific bits prior to relocation. 224 */ 225 bl lowlevel_init /* go setup pll,mux,memory */ 226 227/* Set stackpointer in internal RAM to call board_init_f */ 228call_board_init_f: 229 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) 230 bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ 231 ldr r0,=0x00000000 232 bl board_init_f 233 234/*------------------------------------------------------------------------------*/ 235 236/* 237 * void relocate_code (addr_sp, gd, addr_moni) 238 * 239 * This "function" does not return, instead it continues in RAM 240 * after relocating the monitor code. 241 * 242 */ 243 .globl relocate_code 244relocate_code: 245 mov r4, r0 /* save addr_sp */ 246 mov r5, r1 /* save addr of gd */ 247 mov r6, r2 /* save addr of destination */ 248 249 /* Set up the stack */ 250stack_setup: 251 mov sp, r4 252 253 adr r0, _start 254 cmp r0, r6 255 beq clear_bss /* skip relocation */ 256 mov r1, r6 /* r1 <- scratch for copy_loop */ 257 ldr r3, _bss_start_ofs 258 add r2, r0, r3 /* r2 <- source end address */ 259 260copy_loop: 261 ldmia r0!, {r9-r10} /* copy from source address [r0] */ 262 stmia r1!, {r9-r10} /* copy to target address [r1] */ 263 cmp r0, r2 /* until source end address [r2] */ 264 blo copy_loop 265 266#ifndef CONFIG_PRELOADER 267 /* 268 * fix .rel.dyn relocations 269 */ 270 ldr r0, _TEXT_BASE /* r0 <- Text base */ 271 sub r9, r6, r0 /* r9 <- relocation offset */ 272 ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ 273 add r10, r10, r0 /* r10 <- sym table in FLASH */ 274 ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ 275 add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ 276 ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ 277 add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ 278fixloop: 279 ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ 280 add r0, r0, r9 /* r0 <- location to fix up in RAM */ 281 ldr r1, [r2, #4] 282 and r7, r1, #0xff 283 cmp r7, #23 /* relative fixup? */ 284 beq fixrel 285 cmp r7, #2 /* absolute fixup? */ 286 beq fixabs 287 /* ignore unknown type of fixup */ 288 b fixnext 289fixabs: 290 /* absolute fix: set location to (offset) symbol value */ 291 mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ 292 add r1, r10, r1 /* r1 <- address of symbol in table */ 293 ldr r1, [r1, #4] /* r1 <- symbol value */ 294 add r1, r1, r9 /* r1 <- relocated sym addr */ 295 b fixnext 296fixrel: 297 /* relative fix: increase location by offset */ 298 ldr r1, [r0] 299 add r1, r1, r9 300fixnext: 301 str r1, [r0] 302 add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ 303 cmp r2, r3 304 blo fixloop 305#endif 306 307#ifdef CONFIG_ENABLE_MMU 308enable_mmu: 309 /* enable domain access */ 310 ldr r5, =0x0000ffff 311 mcr p15, 0, r5, c3, c0, 0 /* load domain access register */ 312 313 /* Set the TTB register */ 314 ldr r0, _mmu_table_base 315 ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE 316 ldr r2, =0xfff00000 317 bic r0, r0, r2 318 orr r1, r0, r1 319 mcr p15, 0, r1, c2, c0, 0 320 321 /* Enable the MMU */ 322 mrc p15, 0, r0, c1, c0, 0 323 orr r0, r0, #1 /* Set CR_M to enable MMU */ 324 325 /* Prepare to enable the MMU */ 326 adr r1, skip_hw_init 327 and r1, r1, #0x3fc 328 ldr r2, _TEXT_BASE 329 ldr r3, =0xfff00000 330 and r2, r2, r3 331 orr r2, r2, r1 332 b mmu_enable 333 334 .align 5 335 /* Run in a single cache-line */ 336mmu_enable: 337 338 mcr p15, 0, r0, c1, c0, 0 339 nop 340 nop 341 mov pc, r2 342skip_hw_init: 343#endif 344 345clear_bss: 346#ifndef CONFIG_PRELOADER 347 ldr r0, _bss_start_ofs 348 ldr r1, _bss_end_ofs 349 mov r4, r6 /* reloc addr */ 350 add r0, r0, r4 351 add r1, r1, r4 352 mov r2, #0x00000000 /* clear */ 353 354clbss_l:str r2, [r0] /* clear loop... */ 355 add r0, r0, #4 356 cmp r0, r1 357 bne clbss_l 358 359#ifndef CONFIG_NAND_SPL 360 bl coloured_LED_init 361 bl red_LED_on 362#endif 363#endif 364 365/* 366 * We are done. Do not return, instead branch to second part of board 367 * initialization, now running from RAM. 368 */ 369#ifdef CONFIG_NAND_SPL 370 ldr pc, _nand_boot 371 372_nand_boot: .word nand_boot 373#else 374 ldr r0, _board_init_r_ofs 375 adr r1, _start 376 add lr, r0, r1 377 add lr, lr, r9 378 /* setup parameters for board_init_r */ 379 mov r0, r5 /* gd_t */ 380 mov r1, r6 /* dest_addr */ 381 /* jump to it ... */ 382 mov pc, lr 383 384_board_init_r_ofs: 385 .word board_init_r - _start 386#endif 387 388_rel_dyn_start_ofs: 389 .word __rel_dyn_start - _start 390_rel_dyn_end_ofs: 391 .word __rel_dyn_end - _start 392_dynsym_start_ofs: 393 .word __dynsym_start - _start 394 395#ifdef CONFIG_ENABLE_MMU 396_mmu_table_base: 397 .word mmu_table 398#endif 399 400#ifndef CONFIG_NAND_SPL 401/* 402 * we assume that cache operation is done before. (eg. cleanup_before_linux()) 403 * actually, we don't need to do anything about cache if not use d-cache in 404 * U-Boot. So, in this function we clean only MMU. by scsuh 405 * 406 * void theLastJump(void *kernel, int arch_num, uint boot_params); 407 */ 408#ifdef CONFIG_ENABLE_MMU 409 .globl theLastJump 410theLastJump: 411 mov r9, r0 412 ldr r3, =0xfff00000 413 ldr r4, _TEXT_PHY_BASE 414 adr r5, phy_last_jump 415 bic r5, r5, r3 416 orr r5, r5, r4 417 mov pc, r5 418phy_last_jump: 419 /* 420 * disable MMU stuff 421 */ 422 mrc p15, 0, r0, c1, c0, 0 423 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */ 424 bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */ 425 orr r0, r0, #0x00000002 /* set bit 2 (A) Align */ 426 orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ 427 mcr p15, 0, r0, c1, c0, 0 428 429 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ 430 431 mov r0, #0 432 mov pc, r9 433#endif 434 435 436/* 437 ************************************************************************* 438 * 439 * Interrupt handling 440 * 441 ************************************************************************* 442 */ 443@ 444@ IRQ stack frame. 445@ 446#define S_FRAME_SIZE 72 447 448#define S_OLD_R0 68 449#define S_PSR 64 450#define S_PC 60 451#define S_LR 56 452#define S_SP 52 453 454#define S_IP 48 455#define S_FP 44 456#define S_R10 40 457#define S_R9 36 458#define S_R8 32 459#define S_R7 28 460#define S_R6 24 461#define S_R5 20 462#define S_R4 16 463#define S_R3 12 464#define S_R2 8 465#define S_R1 4 466#define S_R0 0 467 468#define MODE_SVC 0x13 469#define I_BIT 0x80 470 471/* 472 * use bad_save_user_regs for abort/prefetch/undef/swi ... 473 */ 474 475 .macro bad_save_user_regs 476 /* carve out a frame on current user stack */ 477 sub sp, sp, #S_FRAME_SIZE 478 /* Save user registers (now in svc mode) r0-r12 */ 479 stmia sp, {r0 - r12} 480 481 ldr r2, IRQ_STACK_START_IN 482 /* get values for "aborted" pc and cpsr (into parm regs) */ 483 ldmia r2, {r2 - r3} 484 /* grab pointer to old stack */ 485 add r0, sp, #S_FRAME_SIZE 486 487 add r5, sp, #S_SP 488 mov r1, lr 489 /* save sp_SVC, lr_SVC, pc, cpsr */ 490 stmia r5, {r0 - r3} 491 /* save current stack into r0 (param register) */ 492 mov r0, sp 493 .endm 494 495 .macro get_bad_stack 496 ldr r13, IRQ_STACK_START_IN @ setup our mode stack 497 498 /* save caller lr in position 0 of saved stack */ 499 str lr, [r13] 500 /* get the spsr */ 501 mrs lr, spsr 502 /* save spsr in position 1 of saved stack */ 503 str lr, [r13, #4] 504 505 /* prepare SVC-Mode */ 506 mov r13, #MODE_SVC 507 @ msr spsr_c, r13 508 /* switch modes, make sure moves will execute */ 509 msr spsr, r13 510 /* capture return pc */ 511 mov lr, pc 512 /* jump to next instruction & switch modes. */ 513 movs pc, lr 514 .endm 515 516 .macro get_bad_stack_swi 517 /* space on current stack for scratch reg. */ 518 sub r13, r13, #4 519 /* save R0's value. */ 520 str r0, [r13] 521 ldr r13, IRQ_STACK_START_IN @ setup our mode stack 522 /* save caller lr in position 0 of saved stack */ 523 str lr, [r0] 524 /* get the spsr */ 525 mrs r0, spsr 526 /* save spsr in position 1 of saved stack */ 527 str lr, [r0, #4] 528 /* restore r0 */ 529 ldr r0, [r13] 530 /* pop stack entry */ 531 add r13, r13, #4 532 .endm 533 534/* 535 * exception handlers 536 */ 537 .align 5 538undefined_instruction: 539 get_bad_stack 540 bad_save_user_regs 541 bl do_undefined_instruction 542 543 .align 5 544software_interrupt: 545 get_bad_stack_swi 546 bad_save_user_regs 547 bl do_software_interrupt 548 549 .align 5 550prefetch_abort: 551 get_bad_stack 552 bad_save_user_regs 553 bl do_prefetch_abort 554 555 .align 5 556data_abort: 557 get_bad_stack 558 bad_save_user_regs 559 bl do_data_abort 560 561 .align 5 562not_used: 563 get_bad_stack 564 bad_save_user_regs 565 bl do_not_used 566 567 .align 5 568irq: 569 get_bad_stack 570 bad_save_user_regs 571 bl do_irq 572 573 .align 5 574fiq: 575 get_bad_stack 576 bad_save_user_regs 577 bl do_fiq 578#endif /* CONFIG_NAND_SPL */ 579