1/* 2 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 3 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24#include <asm-offsets.h> 25#include <config.h> 26#include "version.h" 27#include <asm/cache.h> 28 29#ifndef CONFIG_IDENT_STRING 30#define CONFIG_IDENT_STRING "" 31#endif 32 33#define _START _start 34#define _FAULT _fault 35 36#define SAVE_ALL \ 37 move.w #0x2700,%sr; /* disable intrs */ \ 38 subl #60,%sp; /* space for 15 regs */ \ 39 moveml %d0-%d7/%a0-%a6,%sp@; 40 41#define RESTORE_ALL \ 42 moveml %sp@,%d0-%d7/%a0-%a6; \ 43 addl #60,%sp; /* space for 15 regs */ \ 44 rte; 45 46.text 47/* 48 * Vector table. This is used for initial platform startup. 49 * These vectors are to catch any un-intended traps. 50 */ 51_vectors: 52 53INITSP: .long 0x00000000 /* Initial SP */ 54INITPC: .long _START /* Initial PC */ 55vector02: .long _FAULT /* Access Error */ 56vector03: .long _FAULT /* Address Error */ 57vector04: .long _FAULT /* Illegal Instruction */ 58vector05: .long _FAULT /* Reserved */ 59vector06: .long _FAULT /* Reserved */ 60vector07: .long _FAULT /* Reserved */ 61vector08: .long _FAULT /* Privilege Violation */ 62vector09: .long _FAULT /* Trace */ 63vector0A: .long _FAULT /* Unimplemented A-Line */ 64vector0B: .long _FAULT /* Unimplemented F-Line */ 65vector0C: .long _FAULT /* Debug Interrupt */ 66vector0D: .long _FAULT /* Reserved */ 67vector0E: .long _FAULT /* Format Error */ 68vector0F: .long _FAULT /* Unitialized Int. */ 69 70/* Reserved */ 71vector10_17: 72.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 73 74vector18: .long _FAULT /* Spurious Interrupt */ 75vector19: .long _FAULT /* Autovector Level 1 */ 76vector1A: .long _FAULT /* Autovector Level 2 */ 77vector1B: .long _FAULT /* Autovector Level 3 */ 78vector1C: .long _FAULT /* Autovector Level 4 */ 79vector1D: .long _FAULT /* Autovector Level 5 */ 80vector1E: .long _FAULT /* Autovector Level 6 */ 81vector1F: .long _FAULT /* Autovector Level 7 */ 82 83/* TRAP #0 - #15 */ 84vector20_2F: 85.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 86.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 87 88/* Reserved */ 89vector30_3F: 90.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 91.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 92 93vector64_127: 94.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 95.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 96.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 97.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 103vector128_191: 104.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 105.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 106.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 107.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 108.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 109.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 110.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 111.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 112 113vector192_255: 114.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 115.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 116.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 117.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 118.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 119.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 120.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 121.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 122 123 .text 124 125 .globl _start 126_start: 127 nop 128 nop 129 move.w #0x2700,%sr /* Mask off Interrupt */ 130 131 /* Set vector base register at the beginning of the Flash */ 132 move.l #CONFIG_SYS_FLASH_BASE, %d0 133 movec %d0, %VBR 134 135 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 136 movec %d0, %RAMBAR1 137 138 /* invalidate and disable cache */ 139 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ 140 movec %d0, %CACR /* Invalidate cache */ 141 nop 142 move.l #0, %d0 143 movec %d0, %ACR0 144 movec %d0, %ACR1 145 146 /* initialize general use internal ram */ 147 move.l #0, %d0 148 move.l #(ICACHE_STATUS), %a1 /* icache */ 149 move.l #(DCACHE_STATUS), %a2 /* icache */ 150 move.l %d0, (%a1) 151 move.l %d0, (%a2) 152 153 /* set stackpointer to end of internal ram to get some stackspace for the 154 first c-code */ 155 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 156 clr.l %sp@- 157 158 move.l #__got_start, %a5 /* put relocation table address to a5 */ 159 160 bsr cpu_init_f /* run low-level CPU init code (from flash) */ 161 bsr board_init_f /* run low-level board init code (from flash) */ 162 163 /* board_init_f() does not return */ 164 165/*------------------------------------------------------------------------------*/ 166 167/* 168 * void relocate_code (addr_sp, gd, addr_moni) 169 * 170 * This "function" does not return, instead it continues in RAM 171 * after relocating the monitor code. 172 * 173 * r3 = dest 174 * r4 = src 175 * r5 = length in bytes 176 * r6 = cachelinesize 177 */ 178 .globl relocate_code 179relocate_code: 180 link.w %a6,#0 181 move.l 8(%a6), %sp /* set new stack pointer */ 182 183 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 184 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 185 186 move.l #CONFIG_SYS_MONITOR_BASE, %a1 187 move.l #__init_end, %a2 188 move.l %a0, %a3 189 190 /* copy the code to RAM */ 1911: 192 move.l (%a1)+, (%a3)+ 193 cmp.l %a1,%a2 194 bgt.s 1b 195 196/* 197 * We are done. Do not return, instead branch to second part of board 198 * initialization, now running from RAM. 199 */ 200 move.l %a0, %a1 201 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 202 jmp (%a1) 203 204in_ram: 205 206clear_bss: 207 /* 208 * Now clear BSS segment 209 */ 210 move.l %a0, %a1 211 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 212 move.l %a0, %d1 213 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2146: 215 clr.l (%a1)+ 216 cmp.l %a1,%d1 217 bgt.s 6b 218 219 /* 220 * fix got table in RAM 221 */ 222 move.l %a0, %a1 223 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 224 move.l %a1,%a5 /* * fix got pointer register a5 */ 225 226 move.l %a0, %a2 227 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 228 2297: 230 move.l (%a1),%d1 231 sub.l #_start,%d1 232 add.l %a0,%d1 233 move.l %d1,(%a1)+ 234 cmp.l %a2, %a1 235 bne 7b 236 237 /* calculate relative jump to board_init_r in ram */ 238 move.l %a0, %a1 239 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 240 241 /* set parameters for board_init_r */ 242 move.l %a0,-(%sp) /* dest_addr */ 243 move.l %d0,-(%sp) /* gd */ 244 jsr (%a1) 245 246/*------------------------------------------------------------------------------*/ 247/* exception code */ 248 .globl _fault 249_fault: 250 jmp _fault 251 .globl _exc_handler 252 253_exc_handler: 254 SAVE_ALL 255 movel %sp,%sp@- 256 bsr exc_handler 257 addql #4,%sp 258 RESTORE_ALL 259 260 .globl _int_handler 261_int_handler: 262 SAVE_ALL 263 movel %sp,%sp@- 264 bsr int_handler 265 addql #4,%sp 266 RESTORE_ALL 267 268/*------------------------------------------------------------------------------*/ 269 270 .globl version_string 271version_string: 272 .ascii U_BOOT_VERSION_STRING, "\0" 273 .align 4 274