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 <config.h> 25#include <timestamp.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, %RAMBAR0 137 138 move.l #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0 139 movec %d0, %RAMBAR1 140 141 move.l #CONFIG_SYS_MBAR, %d0 /* set MBAR address */ 142 move.c %d0, %MBAR 143 144 /* invalidate and disable cache */ 145 move.l #0x01040100, %d0 /* Invalidate cache cmd */ 146 movec %d0, %CACR /* Invalidate cache */ 147 move.l #0, %d0 148 movec %d0, %ACR0 149 movec %d0, %ACR1 150 movec %d0, %ACR2 151 movec %d0, %ACR3 152 153 /* initialize general use internal ram */ 154 move.l #0, %d0 155 move.l #(ICACHE_STATUS), %a1 /* icache */ 156 move.l #(DCACHE_STATUS), %a2 /* icache */ 157 move.l %d0, (%a1) 158 move.l %d0, (%a2) 159 160 /* set stackpointer to end of internal ram to get some stackspace for the 161 first c-code */ 162 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 163 clr.l %sp@- 164 165 move.l #__got_start, %a5 /* put relocation table address to a5 */ 166 167 bsr cpu_init_f /* run low-level CPU init code (from flash) */ 168 bsr board_init_f /* run low-level board init code (from flash) */ 169 170 /* board_init_f() does not return */ 171 172/*------------------------------------------------------------------------------*/ 173 174/* 175 * void relocate_code (addr_sp, gd, addr_moni) 176 * 177 * This "function" does not return, instead it continues in RAM 178 * after relocating the monitor code. 179 * 180 * r3 = dest 181 * r4 = src 182 * r5 = length in bytes 183 * r6 = cachelinesize 184 */ 185 .globl relocate_code 186relocate_code: 187 link.w %a6,#0 188 move.l 8(%a6), %sp /* set new stack pointer */ 189 190 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 191 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 192 193 move.l #CONFIG_SYS_MONITOR_BASE, %a1 194 move.l #__init_end, %a2 195 move.l %a0, %a3 196 197 /* copy the code to RAM */ 1981: 199 move.l (%a1)+, (%a3)+ 200 cmp.l %a1,%a2 201 bgt.s 1b 202 203/* 204 * We are done. Do not return, instead branch to second part of board 205 * initialization, now running from RAM. 206 */ 207 move.l %a0, %a1 208 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 209 jmp (%a1) 210 211in_ram: 212 213clear_bss: 214 /* 215 * Now clear BSS segment 216 */ 217 move.l %a0, %a1 218 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 219 move.l %a0, %d1 220 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2216: 222 clr.l (%a1)+ 223 cmp.l %a1,%d1 224 bgt.s 6b 225 226 /* 227 * fix got table in RAM 228 */ 229 move.l %a0, %a1 230 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 231 move.l %a1,%a5 /* * fix got pointer register a5 */ 232 233 move.l %a0, %a2 234 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 235 2367: 237 move.l (%a1),%d1 238 sub.l #_start,%d1 239 add.l %a0,%d1 240 move.l %d1,(%a1)+ 241 cmp.l %a2, %a1 242 bne 7b 243 244 /* calculate relative jump to board_init_r in ram */ 245 move.l %a0, %a1 246 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 247 248 /* set parameters for board_init_r */ 249 move.l %a0,-(%sp) /* dest_addr */ 250 move.l %d0,-(%sp) /* gd */ 251 jsr (%a1) 252 253/*------------------------------------------------------------------------------*/ 254/* exception code */ 255 .globl _fault 256_fault: 257 bra _fault 258 .globl _exc_handler 259 260_exc_handler: 261 SAVE_ALL 262 movel %sp,%sp@- 263 bsr exc_handler 264 addql #4,%sp 265 RESTORE_ALL 266 267 .globl _int_handler 268_int_handler: 269 SAVE_ALL 270 movel %sp,%sp@- 271 bsr int_handler 272 addql #4,%sp 273 RESTORE_ALL 274 275/*------------------------------------------------------------------------------*/ 276 277 .globl version_string 278version_string: 279 .ascii U_BOOT_VERSION 280 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" 281 .ascii CONFIG_IDENT_STRING, "\0" 282 .align 4 283