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Kconfig: Move config IDENT_STRING to Kconfig
[people/ms/u-boot.git] / arch / m68k / cpu / mcf523x / start.S
CommitLineData
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 12
4a442d31
TL		 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
5c928d02 27
4a442d31 28/*
5c928d02
AD		 29 * Vector table. This is used for initial platform startup.
30 * These vectors are to catch any un-intended traps.
4a442d31
TL		 31 */
32_vectors:
5c928d02
AD		 33INITSP: .long 0x00000000 /* Initial SP */
34INITPC: .long _START /* Initial PC */
4a442d31 35
5c928d02
AD		 36vector02_0F:
37.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
38.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
4a442d31
TL		 39
40/* Reserved */
41vector10_17:
42.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
43
5c928d02
AD		 44vector18_1F:
45.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
4a442d31
TL		 46
47/* TRAP #0 - #15 */
48vector20_2F:
49.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
51
52/* Reserved */
53vector30_3F:
54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
56
57vector64_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
67vector128_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
77vector192_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
5c928d02 87.text
4a442d31 88
5c928d02 89.globl _start
4a442d31
TL		 90_start:
91 nop
92 nop
5c928d02 93 move.w #0x2700,%sr /* Mask off Interrupt */
4a442d31
TL		 94
95 /* Set vector base register at the beginning of the Flash */
6d0f6bcf 96 move.l #CONFIG_SYS_FLASH_BASE, %d0
4a442d31
TL		 97 movec %d0, %VBR
98
6d0f6bcf 99 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
4a442d31
TL		 100 movec %d0, %RAMBAR1
101
102 /* invalidate and disable cache */
5c928d02
AD		 103 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */
104 movec %d0, %CACR /* Invalidate cache */
4a442d31
TL		 105 nop
106 move.l #0, %d0
107 movec %d0, %ACR0
108 movec %d0, %ACR1
109
110 /* initialize general use internal ram */
5c928d02
AD		 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)
4a442d31 116
5044c9cc 117 /* put relocation table address to a5 */
5c928d02 118 move.l #__got_start, %a5
4a442d31 119
5044c9cc 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 */
5c928d02
AD		 132 move.l %d0, %sp
133 move.l %sp, %fp
5044c9cc 134
135 /* initialize reserved area */
5c928d02 136 move.l %d0, -(%sp)
5044c9cc 137 move.l #board_init_f_init_reserve, %a1
138 jsr (%a1)
4a442d31 139
55ac54c4 140 /* run low-level CPU init code (from flash) */
5c928d02
AD		 141 move.l #cpu_init_f, %a1
142 jsr (%a1)
143
55ac54c4 144 /* run low-level board init code (from flash) */
5c928d02
AD		 145 clr.l %sp@-
146 move.l #board_init_f, %a1
147 jsr (%a1)
4a442d31
TL		 148
149 /* board_init_f() does not return */
150
5c928d02 151/******************************************************************************/
4a442d31
TL		 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 */
5c928d02 164.globl relocate_code
4a442d31 165relocate_code:
5c928d02
AD		 166 link.w %a6,#0
167 move.l 8(%a6), %sp /* set new stack pointer */
4a442d31 168
5c928d02
AD		 169 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
170 move.l 16(%a6), %a0 /* Save copy of Destination Address */
4a442d31 171
5c928d02
AD		 172 move.l #CONFIG_SYS_MONITOR_BASE, %a1
173 move.l #__init_end, %a2
174 move.l %a0, %a3
4a442d31
TL		 175
176 /* copy the code to RAM */
1771:
5c928d02
AD		 178 move.l (%a1)+, (%a3)+
179 cmp.l %a1,%a2
180 bgt.s 1b
4a442d31
TL		 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
6d0f6bcf 187 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
4a442d31
TL		 188 jmp (%a1)
189
190in_ram:
191
192clear_bss:
193 /*
194 * Now clear BSS segment
195 */
196 move.l %a0, %a1
6d0f6bcf 197 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
4a442d31 198 move.l %a0, %d1
6d0f6bcf 199 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
4a442d31
TL		 2006:
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
6d0f6bcf 209 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
4a442d31
TL		 210 move.l %a1,%a5 /* * fix got pointer register a5 */
211
212 move.l %a0, %a2
6d0f6bcf 213 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
4a442d31
TL		 214
2157:
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 */
5c928d02
AD		 224 move.l %a0, %a1
225 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
4a442d31
TL		 226
227 /* set parameters for board_init_r */
5c928d02
AD		 228 move.l %a0,-(%sp) /* dest_addr */
229 move.l %d0,-(%sp) /* gd */
4a442d31
TL		 230 jsr (%a1)
231
5c928d02
AD		 232/******************************************************************************/
233
4a442d31 234/* exception code */
5c928d02 235.globl _fault
4a442d31 236_fault:
5c928d02 237 bra _fault
4a442d31 238
5c928d02 239.globl _exc_handler
4a442d31
TL		 240_exc_handler:
241 SAVE_ALL
242 movel %sp,%sp@-
5c928d02 243 bsr exc_handler
4a442d31
TL		 244 addql #4,%sp
245 RESTORE_ALL
246
5c928d02 247.globl _int_handler
4a442d31
TL		 248_int_handler:
249 SAVE_ALL
250 movel %sp,%sp@-
5c928d02 251 bsr int_handler
4a442d31
TL		 252 addql #4,%sp
253 RESTORE_ALL
254
5c928d02 255/******************************************************************************/
4a442d31 256
5c928d02 257.globl version_string
4a442d31 258version_string:
5c928d02
AD		 259.ascii U_BOOT_VERSION_STRING, "\0"
260.align 4
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