1/* 2 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 3 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> 4 * 5 * (C) Copyright 2004-2008 Freescale Semiconductor, Inc. 6 * TsiChung Liew (Tsi-Chung.Liew@freescale.com) 7 * 8 * See file CREDITS for list of people who contributed to this 9 * project. 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License as 13 * published by the Free Software Foundation; either version 2 of 14 * the License, or (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 24 * MA 02111-1307 USA 25 */ 26 27#include <asm-offsets.h> 28#include <config.h> 29#include <timestamp.h> 30#include "version.h" 31#include <asm/cache.h> 32 33#ifndef CONFIG_IDENT_STRING 34#define CONFIG_IDENT_STRING "" 35#endif 36 37#define _START _start 38#define _FAULT _fault 39 40#define SAVE_ALL \ 41 move.w #0x2700,%sr; /* disable intrs */ \ 42 subl #60,%sp; /* space for 15 regs */ \ 43 moveml %d0-%d7/%a0-%a6,%sp@; 44 45#define RESTORE_ALL \ 46 moveml %sp@,%d0-%d7/%a0-%a6; \ 47 addl #60,%sp; /* space for 15 regs */ \ 48 rte; 49 50#if !defined(CONFIG_MONITOR_IS_IN_RAM) 51.text 52/* 53 * Vector table. This is used for initial platform startup. 54 * These vectors are to catch any un-intended traps. 55 */ 56_vectors: 57 58INITSP: .long 0x00000000 /* Initial SP */ 59INITPC: .long _START /* Initial PC */ 60vector02: .long _FAULT /* Access Error */ 61vector03: .long _FAULT /* Address Error */ 62vector04: .long _FAULT /* Illegal Instruction */ 63vector05: .long _FAULT /* Reserved */ 64vector06: .long _FAULT /* Reserved */ 65vector07: .long _FAULT /* Reserved */ 66vector08: .long _FAULT /* Privilege Violation */ 67vector09: .long _FAULT /* Trace */ 68vector0A: .long _FAULT /* Unimplemented A-Line */ 69vector0B: .long _FAULT /* Unimplemented F-Line */ 70vector0C: .long _FAULT /* Debug Interrupt */ 71vector0D: .long _FAULT /* Reserved */ 72vector0E: .long _FAULT /* Format Error */ 73vector0F: .long _FAULT /* Unitialized Int. */ 74 75/* Reserved */ 76vector10_17: 77.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 78 79vector18: .long _FAULT /* Spurious Interrupt */ 80vector19: .long _FAULT /* Autovector Level 1 */ 81vector1A: .long _FAULT /* Autovector Level 2 */ 82vector1B: .long _FAULT /* Autovector Level 3 */ 83vector1C: .long _FAULT /* Autovector Level 4 */ 84vector1D: .long _FAULT /* Autovector Level 5 */ 85vector1E: .long _FAULT /* Autovector Level 6 */ 86vector1F: .long _FAULT /* Autovector Level 7 */ 87 88/* TRAP #0 - #15 */ 89vector20_2F: 90.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 91.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 92 93/* Reserved */ 94vector30_3F: 95.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 96.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 97 98vector64_127: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 103.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 108vector128_191: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 113.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 118vector192_255: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 123.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 124.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 125.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 126.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 127#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */ 128 129 .text 130 131 .globl _start 132_start: 133 nop 134 nop 135 move.w #0x2700,%sr /* Mask off Interrupt */ 136 137#if !defined(CONFIG_MONITOR_IS_IN_RAM) 138 /* Set vector base register at the beginning of the Flash */ 139 move.l #CONFIG_SYS_FLASH_BASE, %d0 140 movec %d0, %VBR 141#endif 142 143 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 144 movec %d0, %RAMBAR1 145 146 /* invalidate and disable cache */ 147 move.l #CF_CACR_CINVA, %d0 /* Invalidate cache cmd */ 148 movec %d0, %CACR /* Invalidate cache */ 149 move.l #0, %d0 150 movec %d0, %ACR0 151 movec %d0, %ACR1 152 153#ifdef CONFIG_MCF5301x 154 move.l #(0xFC0a0010), %a0 155 move.w (%a0), %d0 156 and.l %d0, 0xEFFF 157 158 move.w %d0, (%a0) 159#endif 160 161 /* initialize general use internal ram */ 162 move.l #0, %d0 163 move.l #(ICACHE_STATUS), %a1 /* icache */ 164 move.l #(DCACHE_STATUS), %a2 /* icache */ 165 move.l %d0, (%a1) 166 move.l %d0, (%a2) 167 168 /* set stackpointer to end of internal ram to get some stackspace for the 169 first c-code */ 170 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 171 clr.l %sp@- 172 173 move.l #__got_start, %a5 /* put relocation table address to a5 */ 174 175 bsr cpu_init_f /* run low-level CPU init code (from flash) */ 176 bsr board_init_f /* run low-level board init code (from flash) */ 177 178 /* board_init_f() does not return */ 179 180/*------------------------------------------------------------------------------*/ 181 182/* 183 * void relocate_code (addr_sp, gd, addr_moni) 184 * 185 * This "function" does not return, instead it continues in RAM 186 * after relocating the monitor code. 187 * 188 * r3 = dest 189 * r4 = src 190 * r5 = length in bytes 191 * r6 = cachelinesize 192 */ 193 .globl relocate_code 194relocate_code: 195 link.w %a6,#0 196 move.l 8(%a6), %sp /* set new stack pointer */ 197 198 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 199 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 200 201 move.l #CONFIG_SYS_MONITOR_BASE, %a1 202 move.l #__init_end, %a2 203 move.l %a0, %a3 204 205 /* copy the code to RAM */ 2061: 207 move.l (%a1)+, (%a3)+ 208 cmp.l %a1,%a2 209 bgt.s 1b 210 211/* 212 * We are done. Do not return, instead branch to second part of board 213 * initialization, now running from RAM. 214 */ 215 move.l %a0, %a1 216 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 217 jmp (%a1) 218 219in_ram: 220 221clear_bss: 222 /* 223 * Now clear BSS segment 224 */ 225 move.l %a0, %a1 226 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 227 move.l %a0, %d1 228 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2296: 230 clr.l (%a1)+ 231 cmp.l %a1,%d1 232 bgt.s 6b 233 234 /* 235 * fix got table in RAM 236 */ 237 move.l %a0, %a1 238 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 239 move.l %a1,%a5 /* * fix got pointer register a5 */ 240 241 move.l %a0, %a2 242 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 243 2447: 245 move.l (%a1),%d1 246 sub.l #_start,%d1 247 add.l %a0,%d1 248 move.l %d1,(%a1)+ 249 cmp.l %a2, %a1 250 bne 7b 251 252 /* calculate relative jump to board_init_r in ram */ 253 move.l %a0, %a1 254 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 255 256 /* set parameters for board_init_r */ 257 move.l %a0,-(%sp) /* dest_addr */ 258 move.l %d0,-(%sp) /* gd */ 259 jsr (%a1) 260 261/*------------------------------------------------------------------------------*/ 262/* exception code */ 263 .globl _fault 264_fault: 265 jmp _fault 266 .globl _exc_handler 267 268_exc_handler: 269 SAVE_ALL 270 movel %sp,%sp@- 271 bsr exc_handler 272 addql #4,%sp 273 RESTORE_ALL 274 275 .globl _int_handler 276_int_handler: 277 SAVE_ALL 278 movel %sp,%sp@- 279 bsr int_handler 280 addql #4,%sp 281 RESTORE_ALL 282 283/*------------------------------------------------------------------------------*/ 284 .globl version_string 285version_string: 286 .ascii U_BOOT_VERSION 287 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" 288 .ascii CONFIG_IDENT_STRING, "\0" 289 .align 4 290