Gitiles
Code Review Sign In
gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 0f8c62a14b523c56874ebcb67c1a16c99aad48b3 / . / cpu / mips / start.S
blob: 947128dd813e7d8c0da58385bae20e1e5779ac73 [file] [log] [blame]
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]1/*
2 * Startup Code for MIPS32 CPU-core
3 *
4 * Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]25#include <config.h>
26#include <version.h>
27#include <asm/regdef.h>
28#include <asm/mipsregs.h>
29
Shinya Kuribayashidecaba62008-03-25 21:30:07 +0900[diff] [blame]30 /*
31 * For the moment disable interrupts, mark the kernel mode and
32 * set ST0_KX so that the CPU does not spit fire when using
33 * 64-bit addresses.
34 */
35 .macro setup_c0_status set clr
36 .set push
37 mfc0 t0, CP0_STATUS
38 or t0, ST0_CU0 | \set | 0x1f | \clr
39 xor t0, 0x1f | \clr
40 mtc0 t0, CP0_STATUS
41 .set noreorder
42 sll zero, 3 # ehb
43 .set pop
44 .endm
45
46 .macro setup_c0_status_reset
47#ifdef CONFIG_64BIT
48 setup_c0_status ST0_KX 0
49#else
50 setup_c0_status 0 0
51#endif
52 .endm
53
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]54#define RVECENT(f,n) \
55 b f; nop
56#define XVECENT(f,bev) \
57 b f ; \
58 li k0,bev
59
60 .set noreorder
61
62 .globl _start
63 .text
64_start:
65 RVECENT(reset,0) /* U-boot entry point */
66 RVECENT(reset,1) /* software reboot */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]67#if defined(CONFIG_INCA_IP)
68 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
69 .word 0x00000000 /* phase of the flash */
70#elif defined(CONFIG_PURPLE)
71 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
72 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]73#else
74 RVECENT(romReserved,2)
75#endif
76 RVECENT(romReserved,3)
77 RVECENT(romReserved,4)
78 RVECENT(romReserved,5)
79 RVECENT(romReserved,6)
80 RVECENT(romReserved,7)
81 RVECENT(romReserved,8)
82 RVECENT(romReserved,9)
83 RVECENT(romReserved,10)
84 RVECENT(romReserved,11)
85 RVECENT(romReserved,12)
86 RVECENT(romReserved,13)
87 RVECENT(romReserved,14)
88 RVECENT(romReserved,15)
89 RVECENT(romReserved,16)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]90 RVECENT(romReserved,17)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]91 RVECENT(romReserved,18)
92 RVECENT(romReserved,19)
93 RVECENT(romReserved,20)
94 RVECENT(romReserved,21)
95 RVECENT(romReserved,22)
96 RVECENT(romReserved,23)
97 RVECENT(romReserved,24)
98 RVECENT(romReserved,25)
99 RVECENT(romReserved,26)
100 RVECENT(romReserved,27)
101 RVECENT(romReserved,28)
102 RVECENT(romReserved,29)
103 RVECENT(romReserved,30)
104 RVECENT(romReserved,31)
105 RVECENT(romReserved,32)
106 RVECENT(romReserved,33)
107 RVECENT(romReserved,34)
108 RVECENT(romReserved,35)
109 RVECENT(romReserved,36)
110 RVECENT(romReserved,37)
111 RVECENT(romReserved,38)
112 RVECENT(romReserved,39)
113 RVECENT(romReserved,40)
114 RVECENT(romReserved,41)
115 RVECENT(romReserved,42)
116 RVECENT(romReserved,43)
117 RVECENT(romReserved,44)
118 RVECENT(romReserved,45)
119 RVECENT(romReserved,46)
120 RVECENT(romReserved,47)
121 RVECENT(romReserved,48)
122 RVECENT(romReserved,49)
123 RVECENT(romReserved,50)
124 RVECENT(romReserved,51)
125 RVECENT(romReserved,52)
126 RVECENT(romReserved,53)
127 RVECENT(romReserved,54)
128 RVECENT(romReserved,55)
129 RVECENT(romReserved,56)
130 RVECENT(romReserved,57)
131 RVECENT(romReserved,58)
132 RVECENT(romReserved,59)
133 RVECENT(romReserved,60)
134 RVECENT(romReserved,61)
135 RVECENT(romReserved,62)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]136 RVECENT(romReserved,63)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]137 XVECENT(romExcHandle,0x200) /* bfc00200: R4000 tlbmiss vector */
138 RVECENT(romReserved,65)
139 RVECENT(romReserved,66)
140 RVECENT(romReserved,67)
141 RVECENT(romReserved,68)
142 RVECENT(romReserved,69)
143 RVECENT(romReserved,70)
144 RVECENT(romReserved,71)
145 RVECENT(romReserved,72)
146 RVECENT(romReserved,73)
147 RVECENT(romReserved,74)
148 RVECENT(romReserved,75)
149 RVECENT(romReserved,76)
150 RVECENT(romReserved,77)
151 RVECENT(romReserved,78)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]152 RVECENT(romReserved,79)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]153 XVECENT(romExcHandle,0x280) /* bfc00280: R4000 xtlbmiss vector */
154 RVECENT(romReserved,81)
155 RVECENT(romReserved,82)
156 RVECENT(romReserved,83)
157 RVECENT(romReserved,84)
158 RVECENT(romReserved,85)
159 RVECENT(romReserved,86)
160 RVECENT(romReserved,87)
161 RVECENT(romReserved,88)
162 RVECENT(romReserved,89)
163 RVECENT(romReserved,90)
164 RVECENT(romReserved,91)
165 RVECENT(romReserved,92)
166 RVECENT(romReserved,93)
167 RVECENT(romReserved,94)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]168 RVECENT(romReserved,95)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]169 XVECENT(romExcHandle,0x300) /* bfc00300: R4000 cache vector */
170 RVECENT(romReserved,97)
171 RVECENT(romReserved,98)
172 RVECENT(romReserved,99)
173 RVECENT(romReserved,100)
174 RVECENT(romReserved,101)
175 RVECENT(romReserved,102)
176 RVECENT(romReserved,103)
177 RVECENT(romReserved,104)
178 RVECENT(romReserved,105)
179 RVECENT(romReserved,106)
180 RVECENT(romReserved,107)
181 RVECENT(romReserved,108)
182 RVECENT(romReserved,109)
183 RVECENT(romReserved,110)
184 RVECENT(romReserved,111)
185 XVECENT(romExcHandle,0x380) /* bfc00380: R4000 general vector */
186 RVECENT(romReserved,113)
187 RVECENT(romReserved,114)
188 RVECENT(romReserved,115)
189 RVECENT(romReserved,116)
190 RVECENT(romReserved,116)
191 RVECENT(romReserved,118)
192 RVECENT(romReserved,119)
193 RVECENT(romReserved,120)
194 RVECENT(romReserved,121)
195 RVECENT(romReserved,122)
196 RVECENT(romReserved,123)
197 RVECENT(romReserved,124)
198 RVECENT(romReserved,125)
199 RVECENT(romReserved,126)
200 RVECENT(romReserved,127)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]201
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]202 /* We hope there are no more reserved vectors!
203 * 128 * 8 == 1024 == 0x400
204 * so this is address R_VEC+0x400 == 0xbfc00400
205 */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]206#ifdef CONFIG_PURPLE
207/* 0xbfc00400 */
208 .word 0xdc870000
209 .word 0xfca70000
210 .word 0x20840008
211 .word 0x20a50008
212 .word 0x20c6ffff
213 .word 0x14c0fffa
214 .word 0x00000000
215 .word 0x03e00008
216 .word 0x00000000
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]217 .word 0x00000000
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]218/* 0xbfc00428 */
219 .word 0xdc870000
220 .word 0xfca70000
221 .word 0x20840008
222 .word 0x20a50008
223 .word 0x20c6ffff
224 .word 0x14c0fffa
225 .word 0x00000000
226 .word 0x03e00008
227 .word 0x00000000
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]228 .word 0x00000000
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]229#endif /* CONFIG_PURPLE */
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]230 .align 4
231reset:
232
233 /* Clear watch registers.
234 */
235 mtc0 zero, CP0_WATCHLO
236 mtc0 zero, CP0_WATCHHI
237
Shinya Kuribayashid43d43e2008-03-25 21:30:07 +0900[diff] [blame]238 /* WP(Watch Pending), SW0/1 should be cleared. */
239 mtc0 zero, CP0_CAUSE
240
Shinya Kuribayashidecaba62008-03-25 21:30:07 +0900[diff] [blame]241 setup_c0_status_reset
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]242
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]243 /* Init Timer */
244 mtc0 zero, CP0_COUNT
245 mtc0 zero, CP0_COMPARE
246
247 /* CONFIG0 register */
248 li t0, CONF_CM_UNCACHED
249 mtc0 t0, CP0_CONFIG
250
Shinya Kuribayashi22069212007-10-21 10:55:36 +0900[diff] [blame]251 /* Initialize $gp.
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]252 */
253 bal 1f
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame]254 nop
Shinya Kuribayashi22069212007-10-21 10:55:36 +0900[diff] [blame]255 .word _gp
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]2561:
Shinya Kuribayashi16664f72007-11-17 20:05:26 +0900[diff] [blame]257 lw gp, 0(ra)
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame]258
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]259 /* Initialize any external memory.
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]260 */
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]261 la t9, lowlevel_init
262 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]263 nop
264
265 /* Initialize caches...
266 */
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]267 la t9, mips_cache_reset
268 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]269 nop
270
271 /* ... and enable them.
272 */
273 li t0, CONF_CM_CACHABLE_NONCOHERENT
274 mtc0 t0, CP0_CONFIG
275
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]276 /* Set up temporary stack.
277 */
Shinya Kuribayashie1390802008-03-25 11:39:29 +0900[diff] [blame]278#ifdef CFG_INIT_RAM_LOCK_MIPS
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]279 li a0, CFG_INIT_SP_OFFSET
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]280 la t9, mips_cache_lock
281 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]282 nop
Shinya Kuribayashie1390802008-03-25 11:39:29 +0900[diff] [blame]283#endif
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]284
285 li t0, CFG_SDRAM_BASE + CFG_INIT_SP_OFFSET
286 la sp, 0(t0)
287
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]288 la t9, board_init_f
Shinya Kuribayashi43c50922008-04-17 23:35:13 +0900[diff] [blame]289 jr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]290 nop
291
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]292/*
293 * void relocate_code (addr_sp, gd, addr_moni)
294 *
295 * This "function" does not return, instead it continues in RAM
296 * after relocating the monitor code.
297 *
298 * a0 = addr_sp
299 * a1 = gd
300 * a2 = destination address
301 */
302 .globl relocate_code
303 .ent relocate_code
304relocate_code:
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]305 move sp, a0 /* Set new stack pointer */
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]306
wdenk27b207f2003-07-24 23:38:38 +0000[diff] [blame]307 li t0, CFG_MONITOR_BASE
308 la t3, in_ram
309 lw t2, -12(t3) /* t2 <-- uboot_end_data */
310 move t1, a2
311
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]312 /*
Shinya Kuribayashi22069212007-10-21 10:55:36 +0900[diff] [blame]313 * Fix $gp:
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]314 *
Shinya Kuribayashi22069212007-10-21 10:55:36 +0900[diff] [blame]315 * New $gp = (Old $gp - CFG_MONITOR_BASE) + Destination Address
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]316 */
317 move t6, gp
318 sub gp, CFG_MONITOR_BASE
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]319 add gp, a2 /* gp now adjusted */
320 sub t6, gp, t6 /* t6 <-- relocation offset */
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]321
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]322 /*
323 * t0 = source address
324 * t1 = target address
325 * t2 = source end address
326 */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]327 /* On the purple board we copy the code earlier in a special way
328 * in order to solve flash problems
329 */
330#ifndef CONFIG_PURPLE
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]3311:
332 lw t3, 0(t0)
333 sw t3, 0(t1)
334 addu t0, 4
335 ble t0, t2, 1b
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]336 addu t1, 4 /* delay slot */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]337#endif
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]338
339 /* If caches were enabled, we would have to flush them here.
340 */
341
342 /* Jump to where we've relocated ourselves.
343 */
344 addi t0, a2, in_ram - _start
Shinya Kuribayashi43c50922008-04-17 23:35:13 +0900[diff] [blame]345 jr t0
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]346 nop
347
Vlad Lungu0f8c62a2008-05-05 14:04:00 +0300[diff] [blame^]348 .word _gp
349 .word _GLOBAL_OFFSET_TABLE_
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]350 .word uboot_end_data
351 .word uboot_end
352 .word num_got_entries
353
354in_ram:
Shinya Kuribayashi22069212007-10-21 10:55:36 +0900[diff] [blame]355 /*
356 * Now we want to update GOT.
357 *
358 * GOT[0] is reserved. GOT[1] is also reserved for the dynamic object
359 * generated by GNU ld. Skip these reserved entries from relocation.
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]360 */
361 lw t3, -4(t0) /* t3 <-- num_got_entries */
Vlad Lungu0f8c62a2008-05-05 14:04:00 +0300[diff] [blame^]362 lw t4, -16(t0) /* t4 <-- _GLOBAL_OFFSET_TABLE_ */
363 lw t5, -20(t0) /* t5 <-- _gp */
364 sub t4, t5 /* compute offset*/
365 add t4, t4, gp /* t4 now holds relocated _GLOBAL_OFFSET_TABLE_ */
Shinya Kuribayashi22069212007-10-21 10:55:36 +0900[diff] [blame]366 addi t4, t4, 8 /* Skipping first two entries. */
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]367 li t2, 2
3681:
369 lw t1, 0(t4)
370 beqz t1, 2f
371 add t1, t6
372 sw t1, 0(t4)
3732:
374 addi t2, 1
375 blt t2, t3, 1b
376 addi t4, 4 /* delay slot */
377
378 /* Clear BSS.
379 */
380 lw t1, -12(t0) /* t1 <-- uboot_end_data */
381 lw t2, -8(t0) /* t2 <-- uboot_end */
382 add t1, t6 /* adjust pointers */
383 add t2, t6
384
385 sub t1, 4
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]3861:
387 addi t1, 4
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]388 bltl t1, t2, 1b
389 sw zero, 0(t1) /* delay slot */
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]390
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]391 move a0, a1
392 la t9, board_init_r
Shinya Kuribayashi43c50922008-04-17 23:35:13 +0900[diff] [blame]393 jr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]394 move a1, a2 /* delay slot */
395
396 .end relocate_code
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]397
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]398 /* Exception handlers.
399 */
400romReserved:
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]401 b romReserved
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]402
403romExcHandle:
Shinya Kuribayashi03c031d2007-10-27 15:27:06 +0900[diff] [blame]404 b romExcHandle