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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / c75eba3b4140187cd0d9bd8049f5df4c49b6889b / . / cpu / mips / start.S
blob: e91e2137d704f7eb8c0fe7ab6b1907673c1f2716 [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
25
26#include <config.h>
27#include <version.h>
28#include <asm/regdef.h>
29#include <asm/mipsregs.h>
30
31
32#define RVECENT(f,n) \
33 b f; nop
34#define XVECENT(f,bev) \
35 b f ; \
36 li k0,bev
37
38 .set noreorder
39
40 .globl _start
41 .text
42_start:
43 RVECENT(reset,0) /* U-boot entry point */
44 RVECENT(reset,1) /* software reboot */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]45#if defined(CONFIG_INCA_IP)
46 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
47 .word 0x00000000 /* phase of the flash */
48#elif defined(CONFIG_PURPLE)
49 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
50 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]51#else
52 RVECENT(romReserved,2)
53#endif
54 RVECENT(romReserved,3)
55 RVECENT(romReserved,4)
56 RVECENT(romReserved,5)
57 RVECENT(romReserved,6)
58 RVECENT(romReserved,7)
59 RVECENT(romReserved,8)
60 RVECENT(romReserved,9)
61 RVECENT(romReserved,10)
62 RVECENT(romReserved,11)
63 RVECENT(romReserved,12)
64 RVECENT(romReserved,13)
65 RVECENT(romReserved,14)
66 RVECENT(romReserved,15)
67 RVECENT(romReserved,16)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]68 RVECENT(romReserved,17)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]69 RVECENT(romReserved,18)
70 RVECENT(romReserved,19)
71 RVECENT(romReserved,20)
72 RVECENT(romReserved,21)
73 RVECENT(romReserved,22)
74 RVECENT(romReserved,23)
75 RVECENT(romReserved,24)
76 RVECENT(romReserved,25)
77 RVECENT(romReserved,26)
78 RVECENT(romReserved,27)
79 RVECENT(romReserved,28)
80 RVECENT(romReserved,29)
81 RVECENT(romReserved,30)
82 RVECENT(romReserved,31)
83 RVECENT(romReserved,32)
84 RVECENT(romReserved,33)
85 RVECENT(romReserved,34)
86 RVECENT(romReserved,35)
87 RVECENT(romReserved,36)
88 RVECENT(romReserved,37)
89 RVECENT(romReserved,38)
90 RVECENT(romReserved,39)
91 RVECENT(romReserved,40)
92 RVECENT(romReserved,41)
93 RVECENT(romReserved,42)
94 RVECENT(romReserved,43)
95 RVECENT(romReserved,44)
96 RVECENT(romReserved,45)
97 RVECENT(romReserved,46)
98 RVECENT(romReserved,47)
99 RVECENT(romReserved,48)
100 RVECENT(romReserved,49)
101 RVECENT(romReserved,50)
102 RVECENT(romReserved,51)
103 RVECENT(romReserved,52)
104 RVECENT(romReserved,53)
105 RVECENT(romReserved,54)
106 RVECENT(romReserved,55)
107 RVECENT(romReserved,56)
108 RVECENT(romReserved,57)
109 RVECENT(romReserved,58)
110 RVECENT(romReserved,59)
111 RVECENT(romReserved,60)
112 RVECENT(romReserved,61)
113 RVECENT(romReserved,62)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]114 RVECENT(romReserved,63)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]115 XVECENT(romExcHandle,0x200) /* bfc00200: R4000 tlbmiss vector */
116 RVECENT(romReserved,65)
117 RVECENT(romReserved,66)
118 RVECENT(romReserved,67)
119 RVECENT(romReserved,68)
120 RVECENT(romReserved,69)
121 RVECENT(romReserved,70)
122 RVECENT(romReserved,71)
123 RVECENT(romReserved,72)
124 RVECENT(romReserved,73)
125 RVECENT(romReserved,74)
126 RVECENT(romReserved,75)
127 RVECENT(romReserved,76)
128 RVECENT(romReserved,77)
129 RVECENT(romReserved,78)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]130 RVECENT(romReserved,79)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]131 XVECENT(romExcHandle,0x280) /* bfc00280: R4000 xtlbmiss vector */
132 RVECENT(romReserved,81)
133 RVECENT(romReserved,82)
134 RVECENT(romReserved,83)
135 RVECENT(romReserved,84)
136 RVECENT(romReserved,85)
137 RVECENT(romReserved,86)
138 RVECENT(romReserved,87)
139 RVECENT(romReserved,88)
140 RVECENT(romReserved,89)
141 RVECENT(romReserved,90)
142 RVECENT(romReserved,91)
143 RVECENT(romReserved,92)
144 RVECENT(romReserved,93)
145 RVECENT(romReserved,94)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]146 RVECENT(romReserved,95)
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]147 XVECENT(romExcHandle,0x300) /* bfc00300: R4000 cache vector */
148 RVECENT(romReserved,97)
149 RVECENT(romReserved,98)
150 RVECENT(romReserved,99)
151 RVECENT(romReserved,100)
152 RVECENT(romReserved,101)
153 RVECENT(romReserved,102)
154 RVECENT(romReserved,103)
155 RVECENT(romReserved,104)
156 RVECENT(romReserved,105)
157 RVECENT(romReserved,106)
158 RVECENT(romReserved,107)
159 RVECENT(romReserved,108)
160 RVECENT(romReserved,109)
161 RVECENT(romReserved,110)
162 RVECENT(romReserved,111)
163 XVECENT(romExcHandle,0x380) /* bfc00380: R4000 general vector */
164 RVECENT(romReserved,113)
165 RVECENT(romReserved,114)
166 RVECENT(romReserved,115)
167 RVECENT(romReserved,116)
168 RVECENT(romReserved,116)
169 RVECENT(romReserved,118)
170 RVECENT(romReserved,119)
171 RVECENT(romReserved,120)
172 RVECENT(romReserved,121)
173 RVECENT(romReserved,122)
174 RVECENT(romReserved,123)
175 RVECENT(romReserved,124)
176 RVECENT(romReserved,125)
177 RVECENT(romReserved,126)
178 RVECENT(romReserved,127)
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]179
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]180 /* We hope there are no more reserved vectors!
181 * 128 * 8 == 1024 == 0x400
182 * so this is address R_VEC+0x400 == 0xbfc00400
183 */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]184#ifdef CONFIG_PURPLE
185/* 0xbfc00400 */
186 .word 0xdc870000
187 .word 0xfca70000
188 .word 0x20840008
189 .word 0x20a50008
190 .word 0x20c6ffff
191 .word 0x14c0fffa
192 .word 0x00000000
193 .word 0x03e00008
194 .word 0x00000000
195 .word 0x00000000
196/* 0xbfc00428 */
197 .word 0xdc870000
198 .word 0xfca70000
199 .word 0x20840008
200 .word 0x20a50008
201 .word 0x20c6ffff
202 .word 0x14c0fffa
203 .word 0x00000000
204 .word 0x03e00008
205 .word 0x00000000
206 .word 0x00000000
207#endif /* CONFIG_PURPLE */
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]208 .align 4
209reset:
210
211 /* Clear watch registers.
212 */
213 mtc0 zero, CP0_WATCHLO
214 mtc0 zero, CP0_WATCHHI
215
216 /* STATUS register */
wdenkf4863a72004-02-07 01:27:10 +0000[diff] [blame]217#ifdef CONFIG_TB0229
218 li k0, ST0_CU0
219#else
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]220 mfc0 k0, CP0_STATUS
wdenkf4863a72004-02-07 01:27:10 +0000[diff] [blame]221#endif
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]222 li k1, ~ST0_IE
223 and k0, k1
224 mtc0 k0, CP0_STATUS
225
226 /* CAUSE register */
227 mtc0 zero, CP0_CAUSE
228
229 /* Init Timer */
230 mtc0 zero, CP0_COUNT
231 mtc0 zero, CP0_COMPARE
232
233 /* CONFIG0 register */
234 li t0, CONF_CM_UNCACHED
235 mtc0 t0, CP0_CONFIG
236
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame^]237 /* Initialize GOT pointer.
238 */
239 bal 1f
240 nop
241 .word _GLOBAL_OFFSET_TABLE_
242 1:
243 move gp, ra
244 lw t1, 0(ra)
245 move gp, t1
246
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]247#ifdef CONFIG_INCA_IP
248 /* Disable INCA-IP Watchdog.
249 */
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame^]250 la t9, disable_incaip_wdt
251 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]252 nop
253#endif
254
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]255 /* Initialize any external memory.
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]256 */
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame^]257 la t9, lowlevel_init
258 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]259 nop
260
261 /* Initialize caches...
262 */
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame^]263 la t9, mips_cache_reset
264 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]265 nop
266
267 /* ... and enable them.
268 */
269 li t0, CONF_CM_CACHABLE_NONCOHERENT
270 mtc0 t0, CP0_CONFIG
271
272
273 /* Set up temporary stack.
274 */
275 li a0, CFG_INIT_SP_OFFSET
Wolfgang Denkc75eba32005-12-01 02:15:07 +0100[diff] [blame^]276 la t9, mips_cache_lock
277 jalr t9
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]278 nop
279
280 li t0, CFG_SDRAM_BASE + CFG_INIT_SP_OFFSET
281 la sp, 0(t0)
282
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]283 la t9, board_init_f
284 j t9
285 nop
286
287
288/*
289 * void relocate_code (addr_sp, gd, addr_moni)
290 *
291 * This "function" does not return, instead it continues in RAM
292 * after relocating the monitor code.
293 *
294 * a0 = addr_sp
295 * a1 = gd
296 * a2 = destination address
297 */
298 .globl relocate_code
299 .ent relocate_code
300relocate_code:
301 move sp, a0 /* Set new stack pointer */
302
wdenk27b207f2003-07-24 23:38:38 +0000[diff] [blame]303 li t0, CFG_MONITOR_BASE
304 la t3, in_ram
305 lw t2, -12(t3) /* t2 <-- uboot_end_data */
306 move t1, a2
307
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]308 /*
309 * Fix GOT pointer:
310 *
311 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
312 */
313 move t6, gp
314 sub gp, CFG_MONITOR_BASE
315 add gp, a2 /* gp now adjusted */
316 sub t6, gp, t6 /* t6 <-- relocation offset */
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]317
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]318 /*
319 * t0 = source address
320 * t1 = target address
321 * t2 = source end address
322 */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]323 /* On the purple board we copy the code earlier in a special way
324 * in order to solve flash problems
325 */
326#ifndef CONFIG_PURPLE
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]3271:
328 lw t3, 0(t0)
329 sw t3, 0(t1)
330 addu t0, 4
331 ble t0, t2, 1b
332 addu t1, 4 /* delay slot */
wdenk3e386912003-04-05 00:53:31 +0000[diff] [blame]333#endif
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]334
335 /* If caches were enabled, we would have to flush them here.
336 */
337
338 /* Jump to where we've relocated ourselves.
339 */
340 addi t0, a2, in_ram - _start
341 j t0
342 nop
343
344 .word uboot_end_data
345 .word uboot_end
346 .word num_got_entries
347
348in_ram:
349 /* Now we want to update GOT.
350 */
351 lw t3, -4(t0) /* t3 <-- num_got_entries */
352 addi t4, gp, 8 /* Skipping first two entries. */
353 li t2, 2
3541:
355 lw t1, 0(t4)
356 beqz t1, 2f
357 add t1, t6
358 sw t1, 0(t4)
3592:
360 addi t2, 1
361 blt t2, t3, 1b
362 addi t4, 4 /* delay slot */
363
364 /* Clear BSS.
365 */
366 lw t1, -12(t0) /* t1 <-- uboot_end_data */
367 lw t2, -8(t0) /* t2 <-- uboot_end */
368 add t1, t6 /* adjust pointers */
369 add t2, t6
370
371 sub t1, 4
3721: addi t1, 4
373 bltl t1, t2, 1b
374 sw zero, 0(t1) /* delay slot */
wdenk8bde7f72003-06-27 21:31:46 +0000[diff] [blame]375
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]376 move a0, a1
377 la t9, board_init_r
378 j t9
379 move a1, a2 /* delay slot */
380
381 .end relocate_code
wdenkc0218802003-03-27 12:09:35 +0000[diff] [blame]382
383
384 /* Exception handlers.
385 */
386romReserved:
387 b romReserved
388
389romExcHandle:
390 b romExcHandle