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 "version.h" 30#include <asm/cache.h> 31 32#ifndef CONFIG_IDENT_STRING 33#define CONFIG_IDENT_STRING "" 34#endif 35 36#define _START _start 37#define _FAULT _fault 38 39#define SAVE_ALL \ 40 move.w #0x2700,%sr; /* disable intrs */ \ 41 subl #60,%sp; /* space for 15 regs */ \ 42 moveml %d0-%d7/%a0-%a6,%sp@; 43 44#define RESTORE_ALL \ 45 moveml %sp@,%d0-%d7/%a0-%a6; \ 46 addl #60,%sp; /* space for 15 regs */ \ 47 rte; 48 49#if !defined(CONFIG_MONITOR_IS_IN_RAM) 50.text 51/* 52 * Vector table. This is used for initial platform startup. 53 * These vectors are to catch any un-intended traps. 54 */ 55_vectors: 56 57INITSP: .long 0x00000000 /* Initial SP */ 58INITPC: .long _START /* Initial PC */ 59vector02: .long _FAULT /* Access Error */ 60vector03: .long _FAULT /* Address Error */ 61vector04: .long _FAULT /* Illegal Instruction */ 62vector05: .long _FAULT /* Reserved */ 63vector06: .long _FAULT /* Reserved */ 64vector07: .long _FAULT /* Reserved */ 65vector08: .long _FAULT /* Privilege Violation */ 66vector09: .long _FAULT /* Trace */ 67vector0A: .long _FAULT /* Unimplemented A-Line */ 68vector0B: .long _FAULT /* Unimplemented F-Line */ 69vector0C: .long _FAULT /* Debug Interrupt */ 70vector0D: .long _FAULT /* Reserved */ 71vector0E: .long _FAULT /* Format Error */ 72vector0F: .long _FAULT /* Unitialized Int. */ 73 74/* Reserved */ 75vector10_17: 76.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 77 78vector18: .long _FAULT /* Spurious Interrupt */ 79vector19: .long _FAULT /* Autovector Level 1 */ 80vector1A: .long _FAULT /* Autovector Level 2 */ 81vector1B: .long _FAULT /* Autovector Level 3 */ 82vector1C: .long _FAULT /* Autovector Level 4 */ 83vector1D: .long _FAULT /* Autovector Level 5 */ 84vector1E: .long _FAULT /* Autovector Level 6 */ 85vector1F: .long _FAULT /* Autovector Level 7 */ 86 87/* TRAP #0 - #15 */ 88vector20_2F: 89.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 90.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 91 92/* Reserved */ 93vector30_3F: 94.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 95.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 96 97vector64_127: 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.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 107vector128_191: 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.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 117vector192_255: 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.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#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */ 127 128 .text 129 130 .globl _start 131_start: 132 nop 133 nop 134 move.w #0x2700,%sr /* Mask off Interrupt */ 135 136#if !defined(CONFIG_MONITOR_IS_IN_RAM) 137 /* Set vector base register at the beginning of the Flash */ 138 move.l #CONFIG_SYS_FLASH_BASE, %d0 139 movec %d0, %VBR 140#endif 141 142 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 143 movec %d0, %RAMBAR1 144 145 /* invalidate and disable cache */ 146 move.l #CF_CACR_CINVA, %d0 /* Invalidate cache cmd */ 147 movec %d0, %CACR /* Invalidate cache */ 148 move.l #0, %d0 149 movec %d0, %ACR0 150 movec %d0, %ACR1 151 152#ifdef CONFIG_MCF5301x 153 move.l #(0xFC0a0010), %a0 154 move.w (%a0), %d0 155 and.l %d0, 0xEFFF 156 157 move.w %d0, (%a0) 158#endif 159 160 /* initialize general use internal ram */ 161 move.l #0, %d0 162 move.l #(ICACHE_STATUS), %a1 /* icache */ 163 move.l #(DCACHE_STATUS), %a2 /* icache */ 164 move.l %d0, (%a1) 165 move.l %d0, (%a2) 166 167 /* set stackpointer to end of internal ram to get some stackspace for the 168 first c-code */ 169 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 170 clr.l %sp@- 171 172 move.l #__got_start, %a5 /* put relocation table address to a5 */ 173 174 bsr cpu_init_f /* run low-level CPU init code (from flash) */ 175 bsr board_init_f /* run low-level board init code (from flash) */ 176 177 /* board_init_f() does not return */ 178 179/*------------------------------------------------------------------------------*/ 180 181/* 182 * void relocate_code (addr_sp, gd, addr_moni) 183 * 184 * This "function" does not return, instead it continues in RAM 185 * after relocating the monitor code. 186 * 187 * r3 = dest 188 * r4 = src 189 * r5 = length in bytes 190 * r6 = cachelinesize 191 */ 192 .globl relocate_code 193relocate_code: 194 link.w %a6,#0 195 move.l 8(%a6), %sp /* set new stack pointer */ 196 197 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 198 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 199 200 move.l #CONFIG_SYS_MONITOR_BASE, %a1 201 move.l #__init_end, %a2 202 move.l %a0, %a3 203 204 /* copy the code to RAM */ 2051: 206 move.l (%a1)+, (%a3)+ 207 cmp.l %a1,%a2 208 bgt.s 1b 209 210/* 211 * We are done. Do not return, instead branch to second part of board 212 * initialization, now running from RAM. 213 */ 214 move.l %a0, %a1 215 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 216 jmp (%a1) 217 218in_ram: 219 220clear_bss: 221 /* 222 * Now clear BSS segment 223 */ 224 move.l %a0, %a1 225 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 226 move.l %a0, %d1 227 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2286: 229 clr.l (%a1)+ 230 cmp.l %a1,%d1 231 bgt.s 6b 232 233 /* 234 * fix got table in RAM 235 */ 236 move.l %a0, %a1 237 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 238 move.l %a1,%a5 /* * fix got pointer register a5 */ 239 240 move.l %a0, %a2 241 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 242 2437: 244 move.l (%a1),%d1 245 sub.l #_start,%d1 246 add.l %a0,%d1 247 move.l %d1,(%a1)+ 248 cmp.l %a2, %a1 249 bne 7b 250 251 /* calculate relative jump to board_init_r in ram */ 252 move.l %a0, %a1 253 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 254 255 /* set parameters for board_init_r */ 256 move.l %a0,-(%sp) /* dest_addr */ 257 move.l %d0,-(%sp) /* gd */ 258 jsr (%a1) 259 260/*------------------------------------------------------------------------------*/ 261/* exception code */ 262 .globl _fault 263_fault: 264 bra _fault 265 .globl _exc_handler 266 267_exc_handler: 268 SAVE_ALL 269 movel %sp,%sp@- 270 bsr exc_handler 271 addql #4,%sp 272 RESTORE_ALL 273 274 .globl _int_handler 275_int_handler: 276 SAVE_ALL 277 movel %sp,%sp@- 278 bsr int_handler 279 addql #4,%sp 280 RESTORE_ALL 281 282/*------------------------------------------------------------------------------*/ 283 .globl version_string 284version_string: 285 .ascii U_BOOT_VERSION_STRING, "\0" 286 .align 4 287