LXR uboot/arch/m68k/cpu/mcf532x/start.S

   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