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 bl _main 228 229/*------------------------------------------------------------------------------*/ 230 231/* 232 * void relocate_code (addr_sp, gd, addr_moni) 233 * 234 * This "function" does not return, instead it continues in RAM 235 * after relocating the monitor code. 236 * 237 */ 238 .globl relocate_code 239relocate_code: 240 mov r4, r0 /* save addr_sp */ 241 mov r5, r1 /* save addr of gd */ 242 mov r6, r2 /* save addr of destination */ 243 244 adr r0, _start 245 cmp r0, r6 246 moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */ 247 beq relocate_done /* skip relocation */ 248 mov r1, r6 /* r1 <- scratch for copy_loop */ 249 ldr r3, _bss_start_ofs 250 add r2, r0, r3 /* r2 <- source end address */ 251 252copy_loop: 253 ldmia r0!, {r9-r10} /* copy from source address [r0] */ 254 stmia r1!, {r9-r10} /* copy to target address [r1] */ 255 cmp r0, r2 /* until source end address [r2] */ 256 blo copy_loop 257 258#ifndef CONFIG_SPL_BUILD 259 /* 260 * fix .rel.dyn relocations 261 */ 262 ldr r0, _TEXT_BASE /* r0 <- Text base */ 263 sub r9, r6, r0 /* r9 <- relocation offset */ 264 ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */ 265 add r10, r10, r0 /* r10 <- sym table in FLASH */ 266 ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */ 267 add r2, r2, r0 /* r2 <- rel dyn start in FLASH */ 268 ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */ 269 add r3, r3, r0 /* r3 <- rel dyn end in FLASH */ 270fixloop: 271 ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ 272 add r0, r0, r9 /* r0 <- location to fix up in RAM */ 273 ldr r1, [r2, #4] 274 and r7, r1, #0xff 275 cmp r7, #23 /* relative fixup? */ 276 beq fixrel 277 cmp r7, #2 /* absolute fixup? */ 278 beq fixabs 279 /* ignore unknown type of fixup */ 280 b fixnext 281fixabs: 282 /* absolute fix: set location to (offset) symbol value */ 283 mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */ 284 add r1, r10, r1 /* r1 <- address of symbol in table */ 285 ldr r1, [r1, #4] /* r1 <- symbol value */ 286 add r1, r1, r9 /* r1 <- relocated sym addr */ 287 b fixnext 288fixrel: 289 /* relative fix: increase location by offset */ 290 ldr r1, [r0] 291 add r1, r1, r9 292fixnext: 293 str r1, [r0] 294 add r2, r2, #8 /* each rel.dyn entry is 8 bytes */ 295 cmp r2, r3 296 blo fixloop 297#endif 298 299#ifdef CONFIG_ENABLE_MMU 300enable_mmu: 301 /* enable domain access */ 302 ldr r5, =0x0000ffff 303 mcr p15, 0, r5, c3, c0, 0 /* load domain access register */ 304 305 /* Set the TTB register */ 306 ldr r0, _mmu_table_base 307 ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE 308 ldr r2, =0xfff00000 309 bic r0, r0, r2 310 orr r1, r0, r1 311 mcr p15, 0, r1, c2, c0, 0 312 313 /* Enable the MMU */ 314 mrc p15, 0, r0, c1, c0, 0 315 orr r0, r0, #1 /* Set CR_M to enable MMU */ 316 317 /* Prepare to enable the MMU */ 318 adr r1, skip_hw_init 319 and r1, r1, #0x3fc 320 ldr r2, _TEXT_BASE 321 ldr r3, =0xfff00000 322 and r2, r2, r3 323 orr r2, r2, r1 324 b mmu_enable 325 326 .align 5 327 /* Run in a single cache-line */ 328mmu_enable: 329 330 mcr p15, 0, r0, c1, c0, 0 331 nop 332 nop 333 mov pc, r2 334skip_hw_init: 335#endif 336 337relocate_done: 338 339 bx lr 340 341_rel_dyn_start_ofs: 342 .word __rel_dyn_start - _start 343_rel_dyn_end_ofs: 344 .word __rel_dyn_end - _start 345_dynsym_start_ofs: 346 .word __dynsym_start - _start 347 348#ifdef CONFIG_ENABLE_MMU 349_mmu_table_base: 350 .word mmu_table 351#endif 352 353 .globl c_runtime_cpu_setup 354c_runtime_cpu_setup: 355 356 mov pc, lr 357 358#ifndef CONFIG_NAND_SPL 359/* 360 * we assume that cache operation is done before. (eg. cleanup_before_linux()) 361 * actually, we don't need to do anything about cache if not use d-cache in 362 * U-Boot. So, in this function we clean only MMU. by scsuh 363 * 364 * void theLastJump(void *kernel, int arch_num, uint boot_params); 365 */ 366#ifdef CONFIG_ENABLE_MMU 367 .globl theLastJump 368theLastJump: 369 mov r9, r0 370 ldr r3, =0xfff00000 371 ldr r4, _TEXT_PHY_BASE 372 adr r5, phy_last_jump 373 bic r5, r5, r3 374 orr r5, r5, r4 375 mov pc, r5 376phy_last_jump: 377 /* 378 * disable MMU stuff 379 */ 380 mrc p15, 0, r0, c1, c0, 0 381 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */ 382 bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */ 383 orr r0, r0, #0x00000002 /* set bit 2 (A) Align */ 384 orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ 385 mcr p15, 0, r0, c1, c0, 0 386 387 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ 388 389 mov r0, #0 390 mov pc, r9 391#endif 392 393 394/* 395 ************************************************************************* 396 * 397 * Interrupt handling 398 * 399 ************************************************************************* 400 */ 401@ 402@ IRQ stack frame. 403@ 404#define S_FRAME_SIZE 72 405 406#define S_OLD_R0 68 407#define S_PSR 64 408#define S_PC 60 409#define S_LR 56 410#define S_SP 52 411 412#define S_IP 48 413#define S_FP 44 414#define S_R10 40 415#define S_R9 36 416#define S_R8 32 417#define S_R7 28 418#define S_R6 24 419#define S_R5 20 420#define S_R4 16 421#define S_R3 12 422#define S_R2 8 423#define S_R1 4 424#define S_R0 0 425 426#define MODE_SVC 0x13 427#define I_BIT 0x80 428 429/* 430 * use bad_save_user_regs for abort/prefetch/undef/swi ... 431 */ 432 433 .macro bad_save_user_regs 434 /* carve out a frame on current user stack */ 435 sub sp, sp, #S_FRAME_SIZE 436 /* Save user registers (now in svc mode) r0-r12 */ 437 stmia sp, {r0 - r12} 438 439 ldr r2, IRQ_STACK_START_IN 440 /* get values for "aborted" pc and cpsr (into parm regs) */ 441 ldmia r2, {r2 - r3} 442 /* grab pointer to old stack */ 443 add r0, sp, #S_FRAME_SIZE 444 445 add r5, sp, #S_SP 446 mov r1, lr 447 /* save sp_SVC, lr_SVC, pc, cpsr */ 448 stmia r5, {r0 - r3} 449 /* save current stack into r0 (param register) */ 450 mov r0, sp 451 .endm 452 453 .macro get_bad_stack 454 ldr r13, IRQ_STACK_START_IN @ setup our mode stack 455 456 /* save caller lr in position 0 of saved stack */ 457 str lr, [r13] 458 /* get the spsr */ 459 mrs lr, spsr 460 /* save spsr in position 1 of saved stack */ 461 str lr, [r13, #4] 462 463 /* prepare SVC-Mode */ 464 mov r13, #MODE_SVC 465 @ msr spsr_c, r13 466 /* switch modes, make sure moves will execute */ 467 msr spsr, r13 468 /* capture return pc */ 469 mov lr, pc 470 /* jump to next instruction & switch modes. */ 471 movs pc, lr 472 .endm 473 474 .macro get_bad_stack_swi 475 /* space on current stack for scratch reg. */ 476 sub r13, r13, #4 477 /* save R0's value. */ 478 str r0, [r13] 479 ldr r13, IRQ_STACK_START_IN @ setup our mode stack 480 /* save caller lr in position 0 of saved stack */ 481 str lr, [r0] 482 /* get the spsr */ 483 mrs r0, spsr 484 /* save spsr in position 1 of saved stack */ 485 str lr, [r0, #4] 486 /* restore r0 */ 487 ldr r0, [r13] 488 /* pop stack entry */ 489 add r13, r13, #4 490 .endm 491 492/* 493 * exception handlers 494 */ 495 .align 5 496undefined_instruction: 497 get_bad_stack 498 bad_save_user_regs 499 bl do_undefined_instruction 500 501 .align 5 502software_interrupt: 503 get_bad_stack_swi 504 bad_save_user_regs 505 bl do_software_interrupt 506 507 .align 5 508prefetch_abort: 509 get_bad_stack 510 bad_save_user_regs 511 bl do_prefetch_abort 512 513 .align 5 514data_abort: 515 get_bad_stack 516 bad_save_user_regs 517 bl do_data_abort 518 519 .align 5 520not_used: 521 get_bad_stack 522 bad_save_user_regs 523 bl do_not_used 524 525 .align 5 526irq: 527 get_bad_stack 528 bad_save_user_regs 529 bl do_irq 530 531 .align 5 532fiq: 533 get_bad_stack 534 bad_save_user_regs 535 bl do_fiq 536#endif /* CONFIG_NAND_SPL */ 537