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1 | /* | |
2 | * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> | |
3 | * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | #include <asm-offsets.h> | |
9 | #include <config.h> | |
10 | #include "version.h" | |
11 | #include <asm/cache.h> | |
12 | ||
13 | #define _START _start | |
14 | #define _FAULT _fault | |
15 | ||
16 | #define SAVE_ALL \ | |
17 | move.w #0x2700,%sr; /* disable intrs */ \ | |
18 | subl #60,%sp; /* space for 15 regs */ \ | |
19 | moveml %d0-%d7/%a0-%a6,%sp@; | |
20 | ||
21 | #define RESTORE_ALL \ | |
22 | moveml %sp@,%d0-%d7/%a0-%a6; \ | |
23 | addl #60,%sp; /* space for 15 regs */ \ | |
24 | rte; | |
25 | ||
26 | .text | |
27 | ||
28 | /* | |
29 | * Vector table. This is used for initial platform startup. | |
30 | * These vectors are to catch any un-intended traps. | |
31 | */ | |
32 | _vectors: | |
33 | INITSP: .long 0x00000000 /* Initial SP */ | |
34 | INITPC: .long _START /* Initial PC */ | |
35 | ||
36 | vector02_0F: | |
37 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
38 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
39 | ||
40 | /* Reserved */ | |
41 | vector10_17: | |
42 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
43 | ||
44 | vector18_1F: | |
45 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
46 | ||
47 | /* TRAP #0 - #15 */ | |
48 | vector20_2F: | |
49 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
50 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
51 | ||
52 | /* Reserved */ | |
53 | vector30_3F: | |
54 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
55 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
56 | ||
57 | vector64_127: | |
58 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
59 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
60 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
61 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
62 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
63 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
64 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
65 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
66 | ||
67 | vector128_191: | |
68 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
69 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
70 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
71 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
72 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
73 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
74 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
75 | .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT | |
76 | ||
77 | vector192_255: | |
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 | .text | |
88 | ||
89 | .globl _start | |
90 | _start: | |
91 | nop | |
92 | nop | |
93 | move.w #0x2700,%sr /* Mask off Interrupt */ | |
94 | ||
95 | /* Set vector base register at the beginning of the Flash */ | |
96 | move.l #CONFIG_SYS_FLASH_BASE, %d0 | |
97 | movec %d0, %VBR | |
98 | ||
99 | move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 | |
100 | movec %d0, %RAMBAR1 | |
101 | ||
102 | /* invalidate and disable cache */ | |
103 | move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ | |
104 | movec %d0, %CACR /* Invalidate cache */ | |
105 | nop | |
106 | move.l #0, %d0 | |
107 | movec %d0, %ACR0 | |
108 | movec %d0, %ACR1 | |
109 | ||
110 | /* initialize general use internal ram */ | |
111 | move.l #0, %d0 | |
112 | move.l #(ICACHE_STATUS), %a1 /* icache */ | |
113 | move.l #(DCACHE_STATUS), %a2 /* icache */ | |
114 | move.l %d0, (%a1) | |
115 | move.l %d0, (%a2) | |
116 | ||
117 | /* put relocation table address to a5 */ | |
118 | move.l #__got_start, %a5 | |
119 | ||
120 | /* setup stack initially on top of internal static ram */ | |
121 | move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp | |
122 | ||
123 | /* | |
124 | * if configured, malloc_f arena will be reserved first, | |
125 | * then (and always) gd struct space will be reserved | |
126 | */ | |
127 | move.l %sp, -(%sp) | |
128 | move.l #board_init_f_alloc_reserve, %a1 | |
129 | jsr (%a1) | |
130 | ||
131 | /* update stack and frame-pointers */ | |
132 | move.l %d0, %sp | |
133 | move.l %sp, %fp | |
134 | ||
135 | /* initialize reserved area */ | |
136 | move.l %d0, -(%sp) | |
137 | move.l #board_init_f_init_reserve, %a1 | |
138 | jsr (%a1) | |
139 | ||
140 | /* run low-level CPU init code (from flash) */ | |
141 | move.l #cpu_init_f, %a1 | |
142 | jsr (%a1) | |
143 | ||
144 | /* run low-level board init code (from flash) */ | |
145 | clr.l %sp@- | |
146 | move.l #board_init_f, %a1 | |
147 | jsr (%a1) | |
148 | ||
149 | /* board_init_f() does not return */ | |
150 | ||
151 | /******************************************************************************/ | |
152 | ||
153 | /* | |
154 | * void relocate_code (addr_sp, gd, addr_moni) | |
155 | * | |
156 | * This "function" does not return, instead it continues in RAM | |
157 | * after relocating the monitor code. | |
158 | * | |
159 | * r3 = dest | |
160 | * r4 = src | |
161 | * r5 = length in bytes | |
162 | * r6 = cachelinesize | |
163 | */ | |
164 | .globl relocate_code | |
165 | relocate_code: | |
166 | link.w %a6,#0 | |
167 | move.l 8(%a6), %sp /* set new stack pointer */ | |
168 | ||
169 | move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ | |
170 | move.l 16(%a6), %a0 /* Save copy of Destination Address */ | |
171 | ||
172 | move.l #CONFIG_SYS_MONITOR_BASE, %a1 | |
173 | move.l #__init_end, %a2 | |
174 | move.l %a0, %a3 | |
175 | ||
176 | /* copy the code to RAM */ | |
177 | 1: | |
178 | move.l (%a1)+, (%a3)+ | |
179 | cmp.l %a1,%a2 | |
180 | bgt.s 1b | |
181 | ||
182 | /* | |
183 | * We are done. Do not return, instead branch to second part of board | |
184 | * initialization, now running from RAM. | |
185 | */ | |
186 | move.l %a0, %a1 | |
187 | add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 | |
188 | jmp (%a1) | |
189 | ||
190 | in_ram: | |
191 | ||
192 | clear_bss: | |
193 | /* | |
194 | * Now clear BSS segment | |
195 | */ | |
196 | move.l %a0, %a1 | |
197 | add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 | |
198 | move.l %a0, %d1 | |
199 | add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 | |
200 | 6: | |
201 | clr.l (%a1)+ | |
202 | cmp.l %a1,%d1 | |
203 | bgt.s 6b | |
204 | ||
205 | /* | |
206 | * fix got table in RAM | |
207 | */ | |
208 | move.l %a0, %a1 | |
209 | add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 | |
210 | move.l %a1,%a5 /* * fix got pointer register a5 */ | |
211 | ||
212 | move.l %a0, %a2 | |
213 | add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 | |
214 | ||
215 | 7: | |
216 | move.l (%a1),%d1 | |
217 | sub.l #_start,%d1 | |
218 | add.l %a0,%d1 | |
219 | move.l %d1,(%a1)+ | |
220 | cmp.l %a2, %a1 | |
221 | bne 7b | |
222 | ||
223 | /* calculate relative jump to board_init_r in ram */ | |
224 | move.l %a0, %a1 | |
225 | add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 | |
226 | ||
227 | /* set parameters for board_init_r */ | |
228 | move.l %a0,-(%sp) /* dest_addr */ | |
229 | move.l %d0,-(%sp) /* gd */ | |
230 | jsr (%a1) | |
231 | ||
232 | /******************************************************************************/ | |
233 | ||
234 | /* exception code */ | |
235 | .globl _fault | |
236 | _fault: | |
237 | bra _fault | |
238 | ||
239 | .globl _exc_handler | |
240 | _exc_handler: | |
241 | SAVE_ALL | |
242 | movel %sp,%sp@- | |
243 | bsr exc_handler | |
244 | addql #4,%sp | |
245 | RESTORE_ALL | |
246 | ||
247 | .globl _int_handler | |
248 | _int_handler: | |
249 | SAVE_ALL | |
250 | movel %sp,%sp@- | |
251 | bsr int_handler | |
252 | addql #4,%sp | |
253 | RESTORE_ALL | |
254 | ||
255 | /******************************************************************************/ | |
256 | ||
257 | .globl version_string | |
258 | version_string: | |
259 | .ascii U_BOOT_VERSION_STRING, "\0" | |
260 | .align 4 |