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gerrit.cesnet.cz / github / trini / u-boot / e77e65dfc2f803e7dd78f5bb2bc6b3750635cedd / . / arch / m68k / cpu / mcf530x / start.S
blob: 097958afda3eccfc6e9d94d5df4566a6cf869b57 [file] [log] [blame]
angelo@sysam.ite77e65d2015-02-12 01:40:00 +0100[diff] [blame^]1/*
2 * (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
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#ifndef CONFIG_IDENT_STRING
14#define CONFIG_IDENT_STRING ""
15#endif
16
17#define _START _start
18#define _FAULT _fault
19
20
21.macro SAVE_ALL
22 move.w #0x2700,%sr; /* disable intrs */
23 subl #60,%sp; /* space for 15 regs */
24 moveml %d0-%d7/%a0-%a6,%sp@
25.endm
26
27.macro RESTORE_ALL
28 moveml %sp@,%d0-%d7/%a0-%a6;
29 addl #60,%sp; /* space for 15 regs */
30 rte
31.endm
32
33/* If we come from a pre-loader we don't need an initial exception
34 * table.
35 */
36#if !defined(CONFIG_MONITOR_IS_IN_RAM)
37
38.text
39/*
40 * Vector table. This is used for initial platform startup.
41 * These vectors are to catch any un-intended traps.
42 */
43_vectors:
44
45/* Flash offset is 0 until we setup CS0 */
46.long 0x00000000
47#if defined(CONFIG_M5307) && \
48 (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
49.long _start - CONFIG_SYS_TEXT_BASE
50#else
51.long _START
52#endif
53
54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
56.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
57.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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
62
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
67.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
77.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
78.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
79.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
80
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
87.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
88.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
89
90#endif
91
92 .text
93 .globl _start
94_start:
95 nop
96 nop
97 move.w #0x2700,%sr
98
99 /* set MBAR address + valid flag */
100 move.l #(CONFIG_SYS_MBAR + 1), %d0
101 move.c %d0, %MBAR
102
103 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
104 move.c %d0, %RAMBAR
105
106 /* DS 4.8.2 (Cache Organization) invalidate and disable cache */
107 move.l #CF_CACR_CINVA, %d0
108 movec %d0, %CACR
109 move.l #0, %d0
110 movec %d0, %ACR0
111 movec %d0, %ACR1
112
113 /*
114 * if we come from a pre-loader we have no exception table and
115 * therefore no VBR to set
116 */
117#if !defined(CONFIG_MONITOR_IS_IN_RAM)
118 move.l #CONFIG_SYS_FLASH_BASE, %d0
119 movec %d0, %VBR
120#endif
121
122 /* initialize general use internal ram */
123 move.l #0, %d0
124 move.l #(ICACHE_STATUS), %a1 /* icache */
125 move.l #(DCACHE_STATUS), %a2 /* dcache */
126 move.l %d0, (%a1)
127 move.l %d0, (%a2)
128
129 /*
130 * set stackpointer to internal sram end - 80
131 * (global data struct size + some bytes)
132 * get some stackspace for the first c-code,
133 */
134 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
135 clr.l %sp@-
136
137 /* put relocation table address to a5 */
138 move.l #__got_start, %a5
139
140 /* run low-level CPU init code (from flash) */
141 bsr cpu_init_f
142
143 /* run low-level board init code (from flash) */
144 bsr board_init_f
145
146 /* board_init_f() does not return */
147
148/*--------------------------------------------------------------------------*/
149
150/*
151 * void relocate_code (addr_sp, gd, addr_moni)
152 *
153 * This "function" does not return, instead it continues in RAM
154 * after relocating the monitor code.
155 *
156 */
157 .globl relocate_code
158relocate_code:
159 link.w %a6,#0
160 move.l 8(%a6), %sp /* set new stack pointer */
161 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
162 move.l 16(%a6), %a0 /* Save copy of Destination Address */
163
164 move.l #CONFIG_SYS_MONITOR_BASE, %a1
165 move.l #__init_end, %a2
166 move.l %a0, %a3
167 /* copy the code to RAM */
1681:
169 move.l (%a1)+, (%a3)+
170 cmp.l %a1,%a2
171 bgt.s 1b
172
173/*
174 * We are done. Do not return, instead branch to second part of board
175 * initialization, now running from RAM.
176 */
177 move.l %a0, %a1
178 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
179 jmp (%a1)
180
181in_ram:
182
183clear_bss:
184 /*
185 * Now clear BSS segment
186 */
187 move.l %a0, %a1
188 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1
189 move.l %a0, %d1
190 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1
1916:
192 clr.l (%a1)+
193 cmp.l %a1,%d1
194 bgt.s 6b
195
196 /*
197 * fix got table in RAM
198 */
199 move.l %a0, %a1
200 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1
201 /* * fix got pointer register a5 */
202 move.l %a1,%a5
203
204 move.l %a0, %a2
205 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2
206
2077:
208 move.l (%a1),%d1
209 sub.l #_start, %d1
210 add.l %a0,%d1
211 move.l %d1,(%a1)+
212 cmp.l %a2, %a1
213 bne 7b
214
215 /* calculate relative jump to board_init_r in ram */
216 move.l %a0, %a1
217 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
218
219 /* set parameters for board_init_r */
220 move.l %a0,-(%sp) /* dest_addr */
221 move.l %d0,-(%sp) /* gd */
222#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \
223 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
224 halt
225#endif
226 jsr (%a1)
227
228/*--------------------------------------------------------------------------*/
229/* exception code */
230 .globl _fault
231_fault:
232 bra _fault
233
234 .globl _exc_handler
235_exc_handler:
236 SAVE_ALL
237 movel %sp,%sp@-
238 bsr exc_handler
239 addql #4,%sp
240 RESTORE_ALL
241
242 .globl _int_handler
243_int_handler:
244 SAVE_ALL
245 movel %sp,%sp@-
246 bsr int_handler
247 addql #4,%sp
248 RESTORE_ALL
249
250/*--------------------------------------------------------------------------*/
251
252 .globl version_string
253version_string:
254 .ascii U_BOOT_VERSION
255 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
256 .ascii CONFIG_IDENT_STRING, "\0"
257 .align 4