2 * Startup Code for MIPS32 CPU-core
4 * Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
6 * See file CREDITS for list of people who contributed to this
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.
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.
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,
27 #include <asm/regdef.h>
28 #include <asm/mipsregs.h>
30 #define RVECENT(f,n) \
32 #define XVECENT(f,bev) \
41 RVECENT(reset,0) /* U-boot entry point */
42 RVECENT(reset,1) /* software reboot */
43 #if defined(CONFIG_INCA_IP)
44 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
45 .word 0x00000000 /* phase of the flash */
46 #elif defined(CONFIG_PURPLE)
47 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
48 .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
50 RVECENT(romReserved,2)
52 RVECENT(romReserved,3)
53 RVECENT(romReserved,4)
54 RVECENT(romReserved,5)
55 RVECENT(romReserved,6)
56 RVECENT(romReserved,7)
57 RVECENT(romReserved,8)
58 RVECENT(romReserved,9)
59 RVECENT(romReserved,10)
60 RVECENT(romReserved,11)
61 RVECENT(romReserved,12)
62 RVECENT(romReserved,13)
63 RVECENT(romReserved,14)
64 RVECENT(romReserved,15)
65 RVECENT(romReserved,16)
66 RVECENT(romReserved,17)
67 RVECENT(romReserved,18)
68 RVECENT(romReserved,19)
69 RVECENT(romReserved,20)
70 RVECENT(romReserved,21)
71 RVECENT(romReserved,22)
72 RVECENT(romReserved,23)
73 RVECENT(romReserved,24)
74 RVECENT(romReserved,25)
75 RVECENT(romReserved,26)
76 RVECENT(romReserved,27)
77 RVECENT(romReserved,28)
78 RVECENT(romReserved,29)
79 RVECENT(romReserved,30)
80 RVECENT(romReserved,31)
81 RVECENT(romReserved,32)
82 RVECENT(romReserved,33)
83 RVECENT(romReserved,34)
84 RVECENT(romReserved,35)
85 RVECENT(romReserved,36)
86 RVECENT(romReserved,37)
87 RVECENT(romReserved,38)
88 RVECENT(romReserved,39)
89 RVECENT(romReserved,40)
90 RVECENT(romReserved,41)
91 RVECENT(romReserved,42)
92 RVECENT(romReserved,43)
93 RVECENT(romReserved,44)
94 RVECENT(romReserved,45)
95 RVECENT(romReserved,46)
96 RVECENT(romReserved,47)
97 RVECENT(romReserved,48)
98 RVECENT(romReserved,49)
99 RVECENT(romReserved,50)
100 RVECENT(romReserved,51)
101 RVECENT(romReserved,52)
102 RVECENT(romReserved,53)
103 RVECENT(romReserved,54)
104 RVECENT(romReserved,55)
105 RVECENT(romReserved,56)
106 RVECENT(romReserved,57)
107 RVECENT(romReserved,58)
108 RVECENT(romReserved,59)
109 RVECENT(romReserved,60)
110 RVECENT(romReserved,61)
111 RVECENT(romReserved,62)
112 RVECENT(romReserved,63)
113 XVECENT(romExcHandle,0x200) /* bfc00200: R4000 tlbmiss vector */
114 RVECENT(romReserved,65)
115 RVECENT(romReserved,66)
116 RVECENT(romReserved,67)
117 RVECENT(romReserved,68)
118 RVECENT(romReserved,69)
119 RVECENT(romReserved,70)
120 RVECENT(romReserved,71)
121 RVECENT(romReserved,72)
122 RVECENT(romReserved,73)
123 RVECENT(romReserved,74)
124 RVECENT(romReserved,75)
125 RVECENT(romReserved,76)
126 RVECENT(romReserved,77)
127 RVECENT(romReserved,78)
128 RVECENT(romReserved,79)
129 XVECENT(romExcHandle,0x280) /* bfc00280: R4000 xtlbmiss vector */
130 RVECENT(romReserved,81)
131 RVECENT(romReserved,82)
132 RVECENT(romReserved,83)
133 RVECENT(romReserved,84)
134 RVECENT(romReserved,85)
135 RVECENT(romReserved,86)
136 RVECENT(romReserved,87)
137 RVECENT(romReserved,88)
138 RVECENT(romReserved,89)
139 RVECENT(romReserved,90)
140 RVECENT(romReserved,91)
141 RVECENT(romReserved,92)
142 RVECENT(romReserved,93)
143 RVECENT(romReserved,94)
144 RVECENT(romReserved,95)
145 XVECENT(romExcHandle,0x300) /* bfc00300: R4000 cache vector */
146 RVECENT(romReserved,97)
147 RVECENT(romReserved,98)
148 RVECENT(romReserved,99)
149 RVECENT(romReserved,100)
150 RVECENT(romReserved,101)
151 RVECENT(romReserved,102)
152 RVECENT(romReserved,103)
153 RVECENT(romReserved,104)
154 RVECENT(romReserved,105)
155 RVECENT(romReserved,106)
156 RVECENT(romReserved,107)
157 RVECENT(romReserved,108)
158 RVECENT(romReserved,109)
159 RVECENT(romReserved,110)
160 RVECENT(romReserved,111)
161 XVECENT(romExcHandle,0x380) /* bfc00380: R4000 general vector */
162 RVECENT(romReserved,113)
163 RVECENT(romReserved,114)
164 RVECENT(romReserved,115)
165 RVECENT(romReserved,116)
166 RVECENT(romReserved,116)
167 RVECENT(romReserved,118)
168 RVECENT(romReserved,119)
169 RVECENT(romReserved,120)
170 RVECENT(romReserved,121)
171 RVECENT(romReserved,122)
172 RVECENT(romReserved,123)
173 RVECENT(romReserved,124)
174 RVECENT(romReserved,125)
175 RVECENT(romReserved,126)
176 RVECENT(romReserved,127)
178 /* We hope there are no more reserved vectors!
179 * 128 * 8 == 1024 == 0x400
180 * so this is address R_VEC+0x400 == 0xbfc00400
205 #endif /* CONFIG_PURPLE */
209 /* Clear watch registers.
211 mtc0 zero, CP0_WATCHLO
212 mtc0 zero, CP0_WATCHHI
214 /* STATUS register */
229 mtc0 zero, CP0_COMPARE
231 /* CONFIG0 register */
232 li t0, CONF_CM_UNCACHED
243 #ifdef CONFIG_INCA_IP
244 /* Disable INCA-IP Watchdog.
246 la t9, disable_incaip_wdt
251 /* Initialize any external memory.
257 /* Initialize caches...
259 la t9, mips_cache_reset
263 /* ... and enable them.
265 li t0, CONF_CM_CACHABLE_NONCOHERENT
268 /* Set up temporary stack.
270 #ifdef CFG_INIT_RAM_LOCK_MIPS
271 li a0, CFG_INIT_SP_OFFSET
272 la t9, mips_cache_lock
277 li t0, CFG_SDRAM_BASE + CFG_INIT_SP_OFFSET
285 * void relocate_code (addr_sp, gd, addr_moni)
287 * This "function" does not return, instead it continues in RAM
288 * after relocating the monitor code.
292 * a2 = destination address
297 move sp, a0 /* Set new stack pointer */
299 li t0, CFG_MONITOR_BASE
301 lw t2, -12(t3) /* t2 <-- uboot_end_data */
307 * New $gp = (Old $gp - CFG_MONITOR_BASE) + Destination Address
310 sub gp, CFG_MONITOR_BASE
311 add gp, a2 /* gp now adjusted */
312 sub t6, gp, t6 /* t6 <-- relocation offset */
315 * t0 = source address
316 * t1 = target address
317 * t2 = source end address
319 /* On the purple board we copy the code earlier in a special way
320 * in order to solve flash problems
322 #ifndef CONFIG_PURPLE
328 addu t1, 4 /* delay slot */
331 /* If caches were enabled, we would have to flush them here.
334 /* Jump to where we've relocated ourselves.
336 addi t0, a2, in_ram - _start
340 .gpword _GLOBAL_OFFSET_TABLE_ /* _GLOBAL_OFFSET_TABLE_ - _gp */
343 .word num_got_entries
347 * Now we want to update GOT.
349 * GOT[0] is reserved. GOT[1] is also reserved for the dynamic object
350 * generated by GNU ld. Skip these reserved entries from relocation.
352 lw t3, -4(t0) /* t3 <-- num_got_entries */
353 lw t4, -16(t0) /* t4 <-- (_GLOBAL_OFFSET_TABLE_ - _gp) */
354 add t4, t4, gp /* t4 now holds _GLOBAL_OFFSET_TABLE_ */
355 addi t4, t4, 8 /* Skipping first two entries. */
365 addi t4, 4 /* delay slot */
369 lw t1, -12(t0) /* t1 <-- uboot_end_data */
370 lw t2, -8(t0) /* t2 <-- uboot_end */
371 add t1, t6 /* adjust pointers */
378 sw zero, 0(t1) /* delay slot */
383 move a1, a2 /* delay slot */
387 /* Exception handlers.