2 * armboot - Startup Code for ARM1176 CPU-core
4 * Copyright (c) 2007 Samsung Electronics
7 * Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
9 * See file CREDITS for list of people who contributed to this
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.
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.
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,
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)
33 #include <asm-offsets.h>
36 #ifdef CONFIG_ENABLE_MMU
37 #include <asm/proc/domain.h>
40 #if !defined(CONFIG_ENABLE_MMU) && !defined(CONFIG_SYS_PHY_UBOOT_BASE)
41 #define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE
45 *************************************************************************
47 * Jump vector table as in table 3.1 in [1]
49 *************************************************************************
54 #ifndef CONFIG_NAND_SPL
55 ldr pc, _undefined_instruction
56 ldr pc, _software_interrupt
57 ldr pc, _prefetch_abort
63 _undefined_instruction:
64 .word undefined_instruction
66 .word software_interrupt
78 .word 0x12345678 /* now 16*4=64 */
85 .balignl 16,0xdeadbeef
87 *************************************************************************
89 * Startup Code (reset vector)
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
96 *************************************************************************
101 .word CONFIG_SYS_TEXT_BASE
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.
109 .word CONFIG_SYS_PHY_UBOOT_BASE
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
118 .globl _bss_start_ofs
120 .word __bss_start - _start
126 /* IRQ stack memory (calculated at run-time) + 8 bytes */
127 .globl IRQ_STACK_START_IN
132 * the actual reset code
137 * set the cpu to SVC32 mode
145 *************************************************************************
147 * CPU_init_critical registers
149 * setup important registers
150 * setup memory timing
152 *************************************************************************
155 * we do sys-critical inits only at reboot,
156 * not when booting from ram!
160 * When booting from NAND - it has definitely been a reset, so, no need
161 * to flush caches and disable the MMU
163 #ifndef CONFIG_NAND_SPL
165 * flush v4 I/D caches
168 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
169 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
172 * disable MMU stuff and caches
174 mrc p15, 0, r0, c1, c0, 0
175 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
176 bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
177 orr r0, r0, #0x00000002 @ set bit 2 (A) Align
178 orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
180 /* Prepare to disable the MMU */
181 adr r2, mmu_disable_phys
182 sub r2, r2, #(CONFIG_SYS_PHY_UBOOT_BASE - CONFIG_SYS_TEXT_BASE)
186 /* Run in a single cache-line */
188 mcr p15, 0, r0, c1, c0, 0
194 #ifdef CONFIG_DISABLE_TCM
198 mrc p15, 0, r0, c0, c0, 2 /* Return TCM details */
204 mcrne p15, 0, r1, c9, c1, 1 /* Disable Instruction TCM if present*/
206 mcrne p15, 0, r1, c9, c1, 0 /* Disable Data TCM if present*/
211 #ifdef CONFIG_PERIPORT_REMAP
212 /* Peri port setup */
213 ldr r0, =CONFIG_PERIPORT_BASE
214 orr r0, r0, #CONFIG_PERIPORT_SIZE
215 mcr p15,0,r0,c15,c2,4
219 * Go setup Memory and board specific bits prior to relocation.
221 bl lowlevel_init /* go setup pll,mux,memory */
223 /* Set stackpointer in internal RAM to call board_init_f */
225 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
226 bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
230 /*------------------------------------------------------------------------------*/
233 * void relocate_code (addr_sp, gd, addr_moni)
235 * This "function" does not return, instead it continues in RAM
236 * after relocating the monitor code.
241 mov r4, r0 /* save addr_sp */
242 mov r5, r1 /* save addr of gd */
243 mov r6, r2 /* save addr of destination */
245 /* Set up the stack */
251 beq clear_bss /* skip relocation */
252 mov r1, r6 /* r1 <- scratch for copy_loop */
254 ldr r3, _bss_start_ofs
255 add r2, r0, r3 /* r2 <- source end address */
258 ldmia r0!, {r9-r10} /* copy from source address [r0] */
259 stmia r1!, {r9-r10} /* copy to target address [r1] */
260 cmp r0, r2 /* until source end address [r2] */
263 #ifndef CONFIG_PRELOADER
265 * fix .rel.dyn relocations
267 ldr r0, _TEXT_BASE /* r0 <- Text base */
268 sub r9, r6, r0 /* r9 <- relocation offset */
269 ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
270 add r10, r10, r0 /* r10 <- sym table in FLASH */
271 ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
272 add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
273 ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
274 add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
276 ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
277 add r0, r0, r9 /* r0 <- location to fix up in RAM */
280 cmp r7, #23 /* relative fixup? */
282 cmp r7, #2 /* absolute fixup? */
284 /* ignore unknown type of fixup */
287 /* absolute fix: set location to (offset) symbol value */
288 mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
289 add r1, r10, r1 /* r1 <- address of symbol in table */
290 ldr r1, [r1, #4] /* r1 <- symbol value */
291 add r1, r9 /* r1 <- relocated sym addr */
294 /* relative fix: increase location by offset */
299 add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
304 #ifdef CONFIG_ENABLE_MMU
306 /* enable domain access */
308 mcr p15, 0, r5, c3, c0, 0 /* load domain access register */
310 /* Set the TTB register */
311 ldr r0, _mmu_table_base
312 ldr r1, =CONFIG_SYS_PHY_UBOOT_BASE
316 mcr p15, 0, r1, c2, c0, 0
319 mrc p15, 0, r0, c1, c0, 0
320 orr r0, r0, #1 /* Set CR_M to enable MMU */
322 /* Prepare to enable the MMU */
332 /* Run in a single cache-line */
335 mcr p15, 0, r0, c1, c0, 0
343 #ifndef CONFIG_PRELOADER
344 ldr r0, _bss_start_ofs
346 ldr r3, _TEXT_BASE /* Text base */
347 mov r4, r6 /* reloc addr */
350 mov r2, #0x00000000 /* clear */
352 clbss_l:str r2, [r0] /* clear loop... */
362 * We are done. Do not return, instead branch to second part of board
363 * initialization, now running from RAM.
365 #ifdef CONFIG_NAND_SPL
368 _nand_boot: .word nand_boot
370 ldr r0, _board_init_r_ofs
374 /* setup parameters for board_init_r */
375 mov r0, r5 /* gd_t */
376 mov r1, r6 /* dest_addr */
381 .word board_init_r - _start
385 .word __rel_dyn_start - _start
387 .word __rel_dyn_end - _start
389 .word __dynsym_start - _start
391 #ifdef CONFIG_ENABLE_MMU
396 #ifndef CONFIG_NAND_SPL
398 * we assume that cache operation is done before. (eg. cleanup_before_linux())
399 * actually, we don't need to do anything about cache if not use d-cache in
400 * U-Boot. So, in this function we clean only MMU. by scsuh
402 * void theLastJump(void *kernel, int arch_num, uint boot_params);
404 #ifdef CONFIG_ENABLE_MMU
409 ldr r4, _TEXT_PHY_BASE
410 adr r5, phy_last_jump
418 mrc p15, 0, r0, c1, c0, 0
419 bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
420 bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */
421 orr r0, r0, #0x00000002 /* set bit 2 (A) Align */
422 orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
423 mcr p15, 0, r0, c1, c0, 0
425 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
433 *************************************************************************
437 *************************************************************************
442 #define S_FRAME_SIZE 72
464 #define MODE_SVC 0x13
468 * use bad_save_user_regs for abort/prefetch/undef/swi ...
471 .macro bad_save_user_regs
472 /* carve out a frame on current user stack */
473 sub sp, sp, #S_FRAME_SIZE
474 /* Save user registers (now in svc mode) r0-r12 */
477 ldr r2, IRQ_STACK_START_IN
478 /* get values for "aborted" pc and cpsr (into parm regs) */
480 /* grab pointer to old stack */
481 add r0, sp, #S_FRAME_SIZE
485 /* save sp_SVC, lr_SVC, pc, cpsr */
487 /* save current stack into r0 (param register) */
492 ldr r13, IRQ_STACK_START_IN @ setup our mode stack
494 /* save caller lr in position 0 of saved stack */
498 /* save spsr in position 1 of saved stack */
501 /* prepare SVC-Mode */
504 /* switch modes, make sure moves will execute */
506 /* capture return pc */
508 /* jump to next instruction & switch modes. */
512 .macro get_bad_stack_swi
513 /* space on current stack for scratch reg. */
515 /* save R0's value. */
517 ldr r13, IRQ_STACK_START_IN @ setup our mode stack
518 /* save caller lr in position 0 of saved stack */
522 /* save spsr in position 1 of saved stack */
526 /* pop stack entry */
534 undefined_instruction:
537 bl do_undefined_instruction
543 bl do_software_interrupt
574 #endif /* CONFIG_NAND_SPL */