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4a442d31 TL |
1 | /* |
2 | * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> | |
3 | * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
4a442d31 TL |
6 | */ |
7 | ||
25ddd1fb | 8 | #include <asm-offsets.h> |
4a442d31 TL |
9 | #include <config.h> |
10 | #include "version.h" | |
dd9f054e | 11 | #include <asm/cache.h> |
4a442d31 TL |
12 | |
13 | #ifndef CONFIG_IDENT_STRING | |
14 | #define CONFIG_IDENT_STRING "" | |
15 | #endif | |
16 | ||
17 | #define _START _start | |
18 | #define _FAULT _fault | |
19 | ||
20 | #define SAVE_ALL \ | |
21 | move.w #0x2700,%sr; /* disable intrs */ \ | |
22 | subl #60,%sp; /* space for 15 regs */ \ | |
23 | moveml %d0-%d7/%a0-%a6,%sp@; | |
24 | ||
25 | #define RESTORE_ALL \ | |
26 | moveml %sp@,%d0-%d7/%a0-%a6; \ | |
27 | addl #60,%sp; /* space for 15 regs */ \ | |
28 | rte; | |
29 | ||
30 | .text | |
31 | /* | |
32 | * Vector table. This is used for initial platform startup. | |
33 | * These vectors are to catch any un-intended traps. | |
34 | */ | |
35 | _vectors: | |
36 | ||
37 | INITSP: .long 0x00000000 /* Initial SP */ | |
53677ef1 | 38 | INITPC: .long _START /* Initial PC */ |
4a442d31 TL |
39 | vector02: .long _FAULT /* Access Error */ |
40 | vector03: .long _FAULT /* Address Error */ | |
41 | vector04: .long _FAULT /* Illegal Instruction */ | |
42 | vector05: .long _FAULT /* Reserved */ | |
43 | vector06: .long _FAULT /* Reserved */ | |
44 | vector07: .long _FAULT /* Reserved */ | |
45 | vector08: .long _FAULT /* Privilege Violation */ | |
46 | vector09: .long _FAULT /* Trace */ | |
47 | vector0A: .long _FAULT /* Unimplemented A-Line */ | |
48 | vector0B: .long _FAULT /* Unimplemented F-Line */ | |
49 | vector0C: .long _FAULT /* Debug Interrupt */ | |
50 | vector0D: .long _FAULT /* Reserved */ | |
51 | vector0E: .long _FAULT /* Format Error */ | |
52 | vector0F: .long _FAULT /* Unitialized Int. */ | |
53 | ||
54 | /* Reserved */ | |
55 | vector10_17: | |
56 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
57 | ||
58 | vector18: .long _FAULT /* Spurious Interrupt */ | |
59 | vector19: .long _FAULT /* Autovector Level 1 */ | |
60 | vector1A: .long _FAULT /* Autovector Level 2 */ | |
61 | vector1B: .long _FAULT /* Autovector Level 3 */ | |
62 | vector1C: .long _FAULT /* Autovector Level 4 */ | |
63 | vector1D: .long _FAULT /* Autovector Level 5 */ | |
64 | vector1E: .long _FAULT /* Autovector Level 6 */ | |
65 | vector1F: .long _FAULT /* Autovector Level 7 */ | |
66 | ||
67 | /* TRAP #0 - #15 */ | |
68 | vector20_2F: | |
69 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
70 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
71 | ||
72 | /* Reserved */ | |
73 | vector30_3F: | |
74 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
75 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
76 | ||
77 | vector64_127: | |
78 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
79 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
80 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
81 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
82 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
83 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
84 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
85 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
86 | ||
87 | vector128_191: | |
88 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
89 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
90 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
91 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
92 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
93 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
94 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
95 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
96 | ||
97 | vector192_255: | |
98 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
99 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
100 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
101 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
102 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
103 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
104 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
105 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
106 | ||
107 | .text | |
108 | ||
109 | .globl _start | |
110 | _start: | |
111 | nop | |
112 | nop | |
113 | move.w #0x2700,%sr /* Mask off Interrupt */ | |
114 | ||
115 | /* Set vector base register at the beginning of the Flash */ | |
6d0f6bcf | 116 | move.l #CONFIG_SYS_FLASH_BASE, %d0 |
4a442d31 TL |
117 | movec %d0, %VBR |
118 | ||
6d0f6bcf | 119 | move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 |
4a442d31 TL |
120 | movec %d0, %RAMBAR1 |
121 | ||
122 | /* invalidate and disable cache */ | |
dd9f054e | 123 | move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ |
4a442d31 TL |
124 | movec %d0, %CACR /* Invalidate cache */ |
125 | nop | |
126 | move.l #0, %d0 | |
127 | movec %d0, %ACR0 | |
128 | movec %d0, %ACR1 | |
129 | ||
130 | /* initialize general use internal ram */ | |
131 | move.l #0, %d0 | |
dd9f054e TL |
132 | move.l #(ICACHE_STATUS), %a1 /* icache */ |
133 | move.l #(DCACHE_STATUS), %a2 /* icache */ | |
4a442d31 TL |
134 | move.l %d0, (%a1) |
135 | move.l %d0, (%a2) | |
136 | ||
5044c9cc | 137 | /* put relocation table address to a5 */ |
138 | move.l #__got_start, %a5 | |
4a442d31 | 139 | |
5044c9cc | 140 | /* setup stack initially on top of internal static ram */ |
141 | move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp | |
142 | ||
143 | /* | |
144 | * if configured, malloc_f arena will be reserved first, | |
145 | * then (and always) gd struct space will be reserved | |
146 | */ | |
147 | move.l %sp, -(%sp) | |
148 | move.l #board_init_f_alloc_reserve, %a1 | |
149 | jsr (%a1) | |
150 | ||
151 | /* update stack and frame-pointers */ | |
152 | move.l %d0, %sp | |
153 | move.l %sp, %fp | |
154 | ||
155 | /* initialize reserved area */ | |
156 | move.l %d0, -(%sp) | |
157 | move.l #board_init_f_init_reserve, %a1 | |
158 | jsr (%a1) | |
4a442d31 | 159 | |
55ac54c4 | 160 | /* run low-level CPU init code (from flash) */ |
161 | move.l #cpu_init_f, %a1 | |
162 | jsr (%a1) | |
163 | /* run low-level board init code (from flash) */ | |
5044c9cc | 164 | clr.l %sp@- |
55ac54c4 | 165 | move.l #board_init_f, %a1 |
166 | jsr (%a1) | |
4a442d31 TL |
167 | |
168 | /* board_init_f() does not return */ | |
169 | ||
170 | /*------------------------------------------------------------------------------*/ | |
171 | ||
172 | /* | |
173 | * void relocate_code (addr_sp, gd, addr_moni) | |
174 | * | |
175 | * This "function" does not return, instead it continues in RAM | |
176 | * after relocating the monitor code. | |
177 | * | |
178 | * r3 = dest | |
179 | * r4 = src | |
180 | * r5 = length in bytes | |
181 | * r6 = cachelinesize | |
182 | */ | |
183 | .globl relocate_code | |
184 | relocate_code: | |
185 | link.w %a6,#0 | |
186 | move.l 8(%a6), %sp /* set new stack pointer */ | |
187 | ||
188 | move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ | |
189 | move.l 16(%a6), %a0 /* Save copy of Destination Address */ | |
190 | ||
6d0f6bcf | 191 | move.l #CONFIG_SYS_MONITOR_BASE, %a1 |
4a442d31 TL |
192 | move.l #__init_end, %a2 |
193 | move.l %a0, %a3 | |
194 | ||
195 | /* copy the code to RAM */ | |
196 | 1: | |
197 | move.l (%a1)+, (%a3)+ | |
198 | cmp.l %a1,%a2 | |
199 | bgt.s 1b | |
200 | ||
201 | /* | |
202 | * We are done. Do not return, instead branch to second part of board | |
203 | * initialization, now running from RAM. | |
204 | */ | |
205 | move.l %a0, %a1 | |
6d0f6bcf | 206 | add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 |
4a442d31 TL |
207 | jmp (%a1) |
208 | ||
209 | in_ram: | |
210 | ||
211 | clear_bss: | |
212 | /* | |
213 | * Now clear BSS segment | |
214 | */ | |
215 | move.l %a0, %a1 | |
6d0f6bcf | 216 | add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 |
4a442d31 | 217 | move.l %a0, %d1 |
6d0f6bcf | 218 | add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 |
4a442d31 TL |
219 | 6: |
220 | clr.l (%a1)+ | |
221 | cmp.l %a1,%d1 | |
222 | bgt.s 6b | |
223 | ||
224 | /* | |
225 | * fix got table in RAM | |
226 | */ | |
227 | move.l %a0, %a1 | |
6d0f6bcf | 228 | add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 |
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229 | move.l %a1,%a5 /* * fix got pointer register a5 */ |
230 | ||
231 | move.l %a0, %a2 | |
6d0f6bcf | 232 | add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 |
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233 | |
234 | 7: | |
235 | move.l (%a1),%d1 | |
236 | sub.l #_start,%d1 | |
237 | add.l %a0,%d1 | |
238 | move.l %d1,(%a1)+ | |
239 | cmp.l %a2, %a1 | |
240 | bne 7b | |
241 | ||
242 | /* calculate relative jump to board_init_r in ram */ | |
243 | move.l %a0, %a1 | |
6d0f6bcf | 244 | add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 |
4a442d31 TL |
245 | |
246 | /* set parameters for board_init_r */ | |
247 | move.l %a0,-(%sp) /* dest_addr */ | |
248 | move.l %d0,-(%sp) /* gd */ | |
249 | jsr (%a1) | |
250 | ||
251 | /*------------------------------------------------------------------------------*/ | |
252 | /* exception code */ | |
253 | .globl _fault | |
254 | _fault: | |
37d6cc31 | 255 | bra _fault |
4a442d31 TL |
256 | .globl _exc_handler |
257 | ||
258 | _exc_handler: | |
259 | SAVE_ALL | |
260 | movel %sp,%sp@- | |
261 | bsr exc_handler | |
262 | addql #4,%sp | |
263 | RESTORE_ALL | |
264 | ||
265 | .globl _int_handler | |
266 | _int_handler: | |
267 | SAVE_ALL | |
268 | movel %sp,%sp@- | |
269 | bsr int_handler | |
270 | addql #4,%sp | |
271 | RESTORE_ALL | |
272 | ||
4a442d31 TL |
273 | /*------------------------------------------------------------------------------*/ |
274 | ||
275 | .globl version_string | |
276 | version_string: | |
09c2e90c | 277 | .ascii U_BOOT_VERSION_STRING, "\0" |
9b46432f | 278 | .align 4 |