2 * armboot - Startup Code for OMP2420/ARM1136 CPU-core
4 * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com>
6 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
7 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
8 * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
9 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
10 * Copyright (c) 2003 Kshitij <kshitij@ti.com>
12 * See file CREDITS for list of people who contributed to this
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 #ifdef CONFIG_PRELOADER
52 .word 0x12345678 /* now 16*4=64 */
54 ldr pc, _undefined_instruction
55 ldr pc, _software_interrupt
56 ldr pc, _prefetch_abort
62 _undefined_instruction: .word undefined_instruction
63 _software_interrupt: .word software_interrupt
64 _prefetch_abort: .word prefetch_abort
65 _data_abort: .word data_abort
66 _not_used: .word not_used
69 _pad: .word 0x12345678 /* now 16*4=64 */
70 #endif /* CONFIG_PRELOADER */
74 .balignl 16,0xdeadbeef
76 *************************************************************************
78 * Startup Code (reset vector)
80 * do important init only if we don't start from memory!
81 * setup Memory and board specific bits prior to relocation.
82 * relocate armboot to ram
85 *************************************************************************
92 #if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
99 * These are defined in the board-specific linker script.
109 #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
110 .globl _datarel_start
112 .word __datarel_start
114 .globl _datarelrolocal_start
115 _datarelrolocal_start:
116 .word __datarelrolocal_start
118 .globl _datarellocal_start
120 .word __datarellocal_start
122 .globl _datarelro_start
124 .word __datarelro_start
135 #ifdef CONFIG_USE_IRQ
136 /* IRQ stack memory (calculated at run-time) */
137 .globl IRQ_STACK_START
141 /* IRQ stack memory (calculated at run-time) */
142 .globl FIQ_STACK_START
147 #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
148 /* IRQ stack memory (calculated at run-time) + 8 bytes */
149 .globl IRQ_STACK_START_IN
154 #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
156 * the actual reset code
161 * set the cpu to SVC32 mode
168 #ifdef CONFIG_OMAP2420H4
169 /* Copy vectors to mask ROM indirect addr */
170 adr r0, _start /* r0 <- current position of code */
171 add r0, r0, #4 /* skip reset vector */
172 mov r2, #64 /* r2 <- size to copy */
173 add r2, r0, r2 /* r2 <- source end address */
174 mov r1, #SRAM_OFFSET0 /* build vect addr */
175 mov r3, #SRAM_OFFSET1
177 mov r3, #SRAM_OFFSET2
180 ldmia r0!, {r3-r10} /* copy from source address [r0] */
181 stmia r1!, {r3-r10} /* copy to target address [r1] */
182 cmp r0, r2 /* until source end address [r2] */
183 bne next /* loop until equal */
184 bl cpy_clk_code /* put dpll adjust code behind vectors */
186 /* the mask ROM code should have PLL and others stable */
187 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
191 /* Set stackpointer in internal RAM to call board_init_f */
193 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
196 #ifdef CONFIG_NAND_SPL
199 #ifdef CONFIG_ONENAND_IPL
203 #endif /* CONFIG_ONENAND_IPL */
204 #endif /* CONFIG_NAND_SPL */
206 /*------------------------------------------------------------------------------*/
209 * void relocate_code (addr_sp, gd, addr_moni)
211 * This "function" does not return, instead it continues in RAM
212 * after relocating the monitor code.
217 mov r4, r0 /* save addr_sp */
218 mov r5, r1 /* save addr of gd */
219 mov r6, r2 /* save addr of destination */
220 mov r7, r2 /* save addr of destination */
222 /* Set up the stack */
229 sub r2, r3, r2 /* r2 <- size of armboot */
230 add r2, r0, r2 /* r2 <- source end address */
234 #ifndef CONFIG_SKIP_RELOCATE_UBOOT
236 ldmia r0!, {r9-r10} /* copy from source address [r0] */
237 stmia r6!, {r9-r10} /* copy to target address [r1] */
238 cmp r0, r2 /* until source end address [r2] */
241 #ifndef CONFIG_PRELOADER
242 /* fix got entries */
244 mov r0, r7 /* reloc addr */
245 ldr r2, _got_start /* addr in Flash */
246 ldr r3, _got_end /* addr in Flash */
261 #endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
264 #ifndef CONFIG_PRELOADER
267 ldr r3, _TEXT_BASE /* Text base */
268 mov r4, r7 /* reloc addr */
273 mov r2, #0x00000000 /* clear */
275 clbss_l:str r2, [r0] /* clear loop... */
279 #endif /* #ifndef CONFIG_PRELOADER */
282 * We are done. Do not return, instead branch to second part of board
283 * initialization, now running from RAM.
285 #ifdef CONFIG_NAND_SPL
288 _nand_boot: .word nand_boot
292 ldr r2, _board_init_r
294 add r2, r2, r7 /* position from board_init_r in RAM */
295 /* setup parameters for board_init_r */
296 mov r0, r5 /* gd_t */
297 mov r1, r7 /* dest_addr */
302 _board_init_r: .word board_init_r
304 #else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
306 * the actual reset code
311 * set the cpu to SVC32 mode
318 #ifdef CONFIG_OMAP2420H4
319 /* Copy vectors to mask ROM indirect addr */
320 adr r0, _start /* r0 <- current position of code */
321 add r0, r0, #4 /* skip reset vector */
322 mov r2, #64 /* r2 <- size to copy */
323 add r2, r0, r2 /* r2 <- source end address */
324 mov r1, #SRAM_OFFSET0 /* build vect addr */
325 mov r3, #SRAM_OFFSET1
327 mov r3, #SRAM_OFFSET2
330 ldmia r0!, {r3-r10} /* copy from source address [r0] */
331 stmia r1!, {r3-r10} /* copy to target address [r1] */
332 cmp r0, r2 /* until source end address [r2] */
333 bne next /* loop until equal */
334 bl cpy_clk_code /* put dpll adjust code behind vectors */
336 /* the mask ROM code should have PLL and others stable */
337 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
341 #ifndef CONFIG_SKIP_RELOCATE_UBOOT
342 relocate: /* relocate U-Boot to RAM */
343 adr r0, _start /* r0 <- current position of code */
344 ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
345 cmp r0, r1 /* don't reloc during debug */
346 #ifndef CONFIG_PRELOADER
348 #endif /* CONFIG_PRELOADER */
350 ldr r2, _armboot_start
352 sub r2, r3, r2 /* r2 <- size of armboot */
353 add r2, r0, r2 /* r2 <- source end address */
356 ldmia r0!, {r3-r10} /* copy from source address [r0] */
357 stmia r1!, {r3-r10} /* copy to target address [r1] */
358 cmp r0, r2 /* until source end address [r2] */
360 #endif /* CONFIG_SKIP_RELOCATE_UBOOT */
362 /* Set up the stack */
364 ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
365 #ifdef CONFIG_PRELOADER
366 sub sp, r0, #128 /* leave 32 words for abort-stack */
368 sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
369 sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */
370 #ifdef CONFIG_USE_IRQ
371 sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
373 sub sp, r0, #12 /* leave 3 words for abort-stack */
374 #endif /* CONFIG_PRELOADER */
375 bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
378 ldr r0, _bss_start /* find start of bss segment */
379 ldr r1, _bss_end /* stop here */
380 mov r2, #0x00000000 /* clear */
382 #ifndef CONFIG_PRELOADER
383 clbss_l:str r2, [r0] /* clear loop... */
389 ldr pc, _start_armboot
391 #ifdef CONFIG_NAND_SPL
392 _start_armboot: .word nand_boot
394 #ifdef CONFIG_ONENAND_IPL
395 _start_armboot: .word start_oneboot
397 _start_armboot: .word start_armboot
398 #endif /* CONFIG_ONENAND_IPL */
399 #endif /* CONFIG_NAND_SPL */
401 #endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
404 *************************************************************************
406 * CPU_init_critical registers
408 * setup important registers
409 * setup memory timing
411 *************************************************************************
413 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
416 * flush v4 I/D caches
419 mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */
420 mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */
423 * disable MMU stuff and caches
425 mrc p15, 0, r0, c1, c0, 0
426 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
427 bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
428 orr r0, r0, #0x00000002 @ set bit 2 (A) Align
429 orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
430 mcr p15, 0, r0, c1, c0, 0
433 * Jump to board specific initialization... The Mask ROM will have already initialized
434 * basic memory. Go here to bump up clock rate and handle wake up conditions.
436 mov ip, lr /* persevere link reg across call */
437 bl lowlevel_init /* go setup pll,mux,memory */
438 mov lr, ip /* restore link */
439 mov pc, lr /* back to my caller */
440 #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
442 #ifndef CONFIG_PRELOADER
444 *************************************************************************
448 *************************************************************************
453 #define S_FRAME_SIZE 72
475 #define MODE_SVC 0x13
479 * use bad_save_user_regs for abort/prefetch/undef/swi ...
480 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
483 .macro bad_save_user_regs
484 sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack
485 stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
487 #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
488 ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort stack
490 ldr r2, _armboot_start
491 sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
492 sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
494 ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs)
495 add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
499 stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
500 mov r0, sp @ save current stack into r0 (param register)
503 .macro irq_save_user_regs
504 sub sp, sp, #S_FRAME_SIZE
505 stmia sp, {r0 - r12} @ Calling r0-r12
506 add r8, sp, #S_PC @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
507 stmdb r8, {sp, lr}^ @ Calling SP, LR
508 str lr, [r8, #0] @ Save calling PC
510 str r6, [r8, #4] @ Save CPSR
511 str r0, [r8, #8] @ Save OLD_R0
515 .macro irq_restore_user_regs
516 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
518 ldr lr, [sp, #S_PC] @ Get PC
519 add sp, sp, #S_FRAME_SIZE
520 subs pc, lr, #4 @ return & move spsr_svc into cpsr
524 #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
525 ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter in banked mode)
527 ldr r13, _armboot_start @ setup our mode stack (enter in banked mode)
528 sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
529 sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move to reserved a couple spots for abort stack
532 str lr, [r13] @ save caller lr in position 0 of saved stack
533 mrs lr, spsr @ get the spsr
534 str lr, [r13, #4] @ save spsr in position 1 of saved stack
536 mov r13, #MODE_SVC @ prepare SVC-Mode
538 msr spsr, r13 @ switch modes, make sure moves will execute
539 mov lr, pc @ capture return pc
540 movs pc, lr @ jump to next instruction & switch modes.
543 .macro get_bad_stack_swi
544 sub r13, r13, #4 @ space on current stack for scratch reg.
545 str r0, [r13] @ save R0's value.
546 #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
547 ldr r0, IRQ_STACK_START_IN @ get data regions start
549 ldr r0, _armboot_start @ get data regions start
550 sub r0, r0, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
551 sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move past gbl and a couple spots for abort stack
553 str lr, [r0] @ save caller lr in position 0 of saved stack
554 mrs r0, spsr @ get the spsr
555 str lr, [r0, #4] @ save spsr in position 1 of saved stack
556 ldr r0, [r13] @ restore r0
557 add r13, r13, #4 @ pop stack entry
560 .macro get_irq_stack @ setup IRQ stack
561 ldr sp, IRQ_STACK_START
564 .macro get_fiq_stack @ setup FIQ stack
565 ldr sp, FIQ_STACK_START
567 #endif /* CONFIG_PRELOADER */
572 #ifdef CONFIG_PRELOADER
575 ldr sp, _TEXT_BASE /* use 32 words about stack */
576 bl hang /* hang and never return */
577 #else /* !CONFIG_PRELOADER */
579 undefined_instruction:
582 bl do_undefined_instruction
588 bl do_software_interrupt
608 #ifdef CONFIG_USE_IRQ
615 irq_restore_user_regs
620 /* someone ought to write a more effiction fiq_save_user_regs */
623 irq_restore_user_regs
641 .global arm1136_cache_flush
643 #if !defined(CONFIG_SYS_NO_ICACHE)
644 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
646 #if !defined(CONFIG_SYS_NO_DCACHE)
647 mcr p15, 0, r1, c7, c14, 0 @ invalidate D cache
649 mov pc, lr @ back to caller
650 #endif /* CONFIG_PRELOADER */