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,
31 #include <asm-offsets.h>
36 #ifdef CONFIG_PRELOADER
53 .word 0x12345678 /* now 16*4=64 */
55 ldr pc, _undefined_instruction
56 ldr pc, _software_interrupt
57 ldr pc, _prefetch_abort
63 _undefined_instruction: .word undefined_instruction
64 _software_interrupt: .word software_interrupt
65 _prefetch_abort: .word prefetch_abort
66 _data_abort: .word data_abort
67 _not_used: .word not_used
70 _pad: .word 0x12345678 /* now 16*4=64 */
71 #endif /* CONFIG_PRELOADER */
75 .balignl 16,0xdeadbeef
77 *************************************************************************
79 * Startup Code (reset vector)
81 * do important init only if we don't start from memory!
82 * setup Memory and board specific bits prior to relocation.
83 * relocate armboot to ram
86 *************************************************************************
91 .word CONFIG_SYS_TEXT_BASE
94 * These are defined in the board-specific linker script.
95 * Subtracting _start from them lets the linker put their
96 * relative position in the executable instead of leaving
101 .word __bss_start - _start
105 .word __bss_end__ - _start
107 #ifdef CONFIG_USE_IRQ
108 /* IRQ stack memory (calculated at run-time) */
109 .globl IRQ_STACK_START
113 /* IRQ stack memory (calculated at run-time) */
114 .globl FIQ_STACK_START
119 /* IRQ stack memory (calculated at run-time) + 8 bytes */
120 .globl IRQ_STACK_START_IN
125 * the actual reset code
130 * set the cpu to SVC32 mode
137 #ifdef CONFIG_OMAP2420H4
138 /* Copy vectors to mask ROM indirect addr */
139 adr r0, _start /* r0 <- current position of code */
140 add r0, r0, #4 /* skip reset vector */
141 mov r2, #64 /* r2 <- size to copy */
142 add r2, r0, r2 /* r2 <- source end address */
143 mov r1, #SRAM_OFFSET0 /* build vect addr */
144 mov r3, #SRAM_OFFSET1
146 mov r3, #SRAM_OFFSET2
149 ldmia r0!, {r3-r10} /* copy from source address [r0] */
150 stmia r1!, {r3-r10} /* copy to target address [r1] */
151 cmp r0, r2 /* until source end address [r2] */
152 bne next /* loop until equal */
153 bl cpy_clk_code /* put dpll adjust code behind vectors */
155 /* the mask ROM code should have PLL and others stable */
156 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
160 /* Set stackpointer in internal RAM to call board_init_f */
162 ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
163 bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
168 /*------------------------------------------------------------------------------*/
171 * void relocate_code (addr_sp, gd, addr_moni)
173 * This "function" does not return, instead it continues in RAM
174 * after relocating the monitor code.
179 mov r4, r0 /* save addr_sp */
180 mov r5, r1 /* save addr of gd */
181 mov r6, r2 /* save addr of destination */
183 /* Set up the stack */
189 beq clear_bss /* skip relocation */
190 mov r1, r6 /* r1 <- scratch for copy_loop */
191 ldr r3, _bss_start_ofs
192 add r2, r0, r3 /* r2 <- source end address */
195 ldmia r0!, {r9-r10} /* copy from source address [r0] */
196 stmia r1!, {r9-r10} /* copy to target address [r1] */
197 cmp r0, r2 /* until source end address [r2] */
200 #ifndef CONFIG_PRELOADER
202 * fix .rel.dyn relocations
204 ldr r0, _TEXT_BASE /* r0 <- Text base */
205 sub r9, r6, r0 /* r9 <- relocation offset */
206 ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
207 add r10, r10, r0 /* r10 <- sym table in FLASH */
208 ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
209 add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
210 ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
211 add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
213 ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
214 add r0, r0, r9 /* r0 <- location to fix up in RAM */
217 cmp r7, #23 /* relative fixup? */
219 cmp r7, #2 /* absolute fixup? */
221 /* ignore unknown type of fixup */
224 /* absolute fix: set location to (offset) symbol value */
225 mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
226 add r1, r10, r1 /* r1 <- address of symbol in table */
227 ldr r1, [r1, #4] /* r1 <- symbol value */
228 add r1, r1, r9 /* r1 <- relocated sym addr */
231 /* relative fix: increase location by offset */
236 add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
242 #ifndef CONFIG_PRELOADER
243 ldr r0, _bss_start_ofs
245 mov r4, r6 /* reloc addr */
248 mov r2, #0x00000000 /* clear */
250 clbss_l:str r2, [r0] /* clear loop... */
254 #endif /* #ifndef CONFIG_PRELOADER */
257 * We are done. Do not return, instead branch to second part of board
258 * initialization, now running from RAM.
260 #ifdef CONFIG_NAND_SPL
261 ldr r0, _nand_boot_ofs
268 ldr r0, _board_init_r_ofs
272 /* setup parameters for board_init_r */
273 mov r0, r5 /* gd_t */
274 mov r1, r6 /* dest_addr */
279 .word board_init_r - _start
283 .word __rel_dyn_start - _start
285 .word __rel_dyn_end - _start
287 .word __dynsym_start - _start
290 *************************************************************************
292 * CPU_init_critical registers
294 * setup important registers
295 * setup memory timing
297 *************************************************************************
299 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
302 * flush v4 I/D caches
305 mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */
306 mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */
309 * disable MMU stuff and caches
311 mrc p15, 0, r0, c1, c0, 0
312 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
313 bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
314 orr r0, r0, #0x00000002 @ set bit 2 (A) Align
315 orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
316 mcr p15, 0, r0, c1, c0, 0
319 * Jump to board specific initialization... The Mask ROM will have already initialized
320 * basic memory. Go here to bump up clock rate and handle wake up conditions.
322 mov ip, lr /* persevere link reg across call */
323 bl lowlevel_init /* go setup pll,mux,memory */
324 mov lr, ip /* restore link */
325 mov pc, lr /* back to my caller */
326 #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
328 #ifndef CONFIG_PRELOADER
330 *************************************************************************
334 *************************************************************************
339 #define S_FRAME_SIZE 72
361 #define MODE_SVC 0x13
365 * use bad_save_user_regs for abort/prefetch/undef/swi ...
366 * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
369 .macro bad_save_user_regs
370 sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack
371 stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
373 ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort stack
374 ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs)
375 add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
379 stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
380 mov r0, sp @ save current stack into r0 (param register)
383 .macro irq_save_user_regs
384 sub sp, sp, #S_FRAME_SIZE
385 stmia sp, {r0 - r12} @ Calling r0-r12
386 add r8, sp, #S_PC @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
387 stmdb r8, {sp, lr}^ @ Calling SP, LR
388 str lr, [r8, #0] @ Save calling PC
390 str r6, [r8, #4] @ Save CPSR
391 str r0, [r8, #8] @ Save OLD_R0
395 .macro irq_restore_user_regs
396 ldmia sp, {r0 - lr}^ @ Calling r0 - lr
398 ldr lr, [sp, #S_PC] @ Get PC
399 add sp, sp, #S_FRAME_SIZE
400 subs pc, lr, #4 @ return & move spsr_svc into cpsr
404 ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter in banked mode)
406 str lr, [r13] @ save caller lr in position 0 of saved stack
407 mrs lr, spsr @ get the spsr
408 str lr, [r13, #4] @ save spsr in position 1 of saved stack
410 mov r13, #MODE_SVC @ prepare SVC-Mode
412 msr spsr, r13 @ switch modes, make sure moves will execute
413 mov lr, pc @ capture return pc
414 movs pc, lr @ jump to next instruction & switch modes.
417 .macro get_bad_stack_swi
418 sub r13, r13, #4 @ space on current stack for scratch reg.
419 str r0, [r13] @ save R0's value.
420 ldr r0, IRQ_STACK_START_IN @ get data regions start
421 str lr, [r0] @ save caller lr in position 0 of saved stack
422 mrs r0, spsr @ get the spsr
423 str lr, [r0, #4] @ save spsr in position 1 of saved stack
424 ldr r0, [r13] @ restore r0
425 add r13, r13, #4 @ pop stack entry
428 .macro get_irq_stack @ setup IRQ stack
429 ldr sp, IRQ_STACK_START
432 .macro get_fiq_stack @ setup FIQ stack
433 ldr sp, FIQ_STACK_START
435 #endif /* CONFIG_PRELOADER */
440 #ifdef CONFIG_PRELOADER
443 ldr sp, _TEXT_BASE /* use 32 words about stack */
444 bl hang /* hang and never return */
445 #else /* !CONFIG_PRELOADER */
447 undefined_instruction:
450 bl do_undefined_instruction
456 bl do_software_interrupt
476 #ifdef CONFIG_USE_IRQ
483 irq_restore_user_regs
488 /* someone ought to write a more effiction fiq_save_user_regs */
491 irq_restore_user_regs
509 .global arm1136_cache_flush
511 #if !defined(CONFIG_SYS_NO_ICACHE)
512 mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
514 #if !defined(CONFIG_SYS_NO_DCACHE)
515 mcr p15, 0, r1, c7, c14, 0 @ invalidate D cache
517 mov pc, lr @ back to caller
518 #endif /* CONFIG_PRELOADER */