LXR uboot/arch/m68k/cpu/mcf52x2/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 * 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 <timestamp.h>
  27#include "version.h"
  28#include <asm/cache.h>
  29
  30#ifndef  CONFIG_IDENT_STRING
  31#define  CONFIG_IDENT_STRING ""
  32#endif
  33
  34#define _START  _start
  35#define _FAULT  _fault
  36
  37
  38#define SAVE_ALL                                                \
  39        move.w  #0x2700,%sr;            /* disable intrs */     \
  40        subl    #60,%sp;                /* space for 15 regs */ \
  41        moveml  %d0-%d7/%a0-%a6,%sp@;                           \
  42
  43#define RESTORE_ALL                                             \
  44        moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  45        addl    #60,%sp;                /* space for 15 regs */ \
  46        rte
  47
  48/* If we come from a pre-loader we don't need an initial exception
  49 * table.
  50 */
  51#if !defined(CONFIG_MONITOR_IS_IN_RAM)
  52
  53.text
  54/*
  55 *      Vector table. This is used for initial platform startup.
  56 *      These vectors are to catch any un-intended traps.
  57 */
  58_vectors:
  59
  60.long   0x00000000              /* Flash offset is 0 until we setup CS0 */
  61#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
  62.long   _start - CONFIG_SYS_TEXT_BASE
  63#else
  64.long   _START
  65#endif
  66
  67.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  68.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  69.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  70.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  71.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  72.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  73.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  74.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  75
  76.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  77.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  78.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  79.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  80.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  81.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  82.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  83.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  84
  85.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  86.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  87.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  88.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  89.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  90.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  91.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  92.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  93
  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
 103#endif
 104
 105        .text
 106
 107
 108#if defined(CONFIG_SYS_INT_FLASH_BASE) && \
 109    (defined(CONFIG_M5282) || defined(CONFIG_M5281))
 110        #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 111                .long   0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */
 112                .long   0xFFFFFFFF /* all sectors protected */
 113                .long   0x00000000 /* supervisor/User restriction */
 114                .long   0x00000000 /* programm/data space restriction */
 115                .long   0x00000000 /* Flash security */
 116        #endif
 117#endif
 118        .globl  _start
 119_start:
 120        nop
 121        nop
 122        move.w #0x2700,%sr
 123
 124#if defined(CONFIG_M5208)
 125        /* Initialize RAMBAR: locate SRAM and validate it */
 126        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 127        movec   %d0, %RAMBAR1
 128#endif
 129
 130#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
 131        move.l  #(CONFIG_SYS_MBAR + 1), %d0             /* set MBAR address + valid flag */
 132        move.c  %d0, %MBAR
 133
 134        /*** The 5249 has MBAR2 as well ***/
 135#ifdef CONFIG_SYS_MBAR2
 136        move.l  #(CONFIG_SYS_MBAR2 + 1), %d0            /* Get MBAR2 address */
 137        movec   %d0, #0xc0e                     /* Set MBAR2 */
 138#endif
 139
 140        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
 141        movec   %d0, %RAMBAR0
 142#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
 143
 144#if defined(CONFIG_M5282) || defined(CONFIG_M5271)
 145        /* Initialize IPSBAR */
 146        move.l  #(CONFIG_SYS_MBAR + 1), %d0             /* set IPSBAR address + valid flag */
 147        move.l  %d0, 0x40000000
 148
 149        /* Initialize RAMBAR1: locate SRAM and validate it */
 150        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
 151        movec   %d0, %RAMBAR1
 152
 153#if defined(CONFIG_M5282)
 154#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 155        /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */
 156
 157        move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0
 158        move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1
 159        move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2
 160_copy_flash:
 161        move.l (%a0)+, (%a2)+
 162        cmp.l %a0, %a1
 163        bgt.s _copy_flash
 164        jmp CONFIG_SYS_INIT_RAM_ADDR
 165
 166_flashbar_setup:
 167        /* Initialize FLASHBAR: locate internal Flash and validate it */
 168        move.l  #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
 169        movec   %d0, %FLASHBAR
 170        jmp _after_flashbar_copy.L      /* Force jump to absolute address */
 171_flashbar_setup_end:
 172        nop
 173_after_flashbar_copy:
 174#else
 175        /* Setup code to initialize FLASHBAR, if start from external Memory */
 176        move.l  #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
 177        movec   %d0, %FLASHBAR
 178#endif /* (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */
 179
 180#endif
 181#endif
 182        /* if we come from a pre-loader we have no exception table and
 183         * therefore no VBR to set
 184         */
 185#if !defined(CONFIG_MONITOR_IS_IN_RAM)
 186#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 187        move.l  #CONFIG_SYS_INT_FLASH_BASE, %d0
 188#else
 189        move.l  #CONFIG_SYS_FLASH_BASE, %d0
 190#endif
 191        movec   %d0, %VBR
 192#endif
 193
 194#ifdef CONFIG_M5275
 195        /* Initialize IPSBAR */
 196        move.l  #(CONFIG_SYS_MBAR + 1), %d0             /* set IPSBAR address + valid flag */
 197        move.l  %d0, 0x40000000
 198/*      movec   %d0, %MBAR */
 199
 200        /* Initialize RAMBAR: locate SRAM and validate it */
 201        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
 202        movec   %d0, %RAMBAR1
 203#endif
 204
 205        /* initialize general use internal ram */
 206        move.l #0, %d0
 207        move.l #(ICACHE_STATUS), %a1    /* icache */
 208        move.l #(DCACHE_STATUS), %a2    /* icache */
 209        move.l %d0, (%a1)
 210        move.l %d0, (%a2)
 211
 212        /* set stackpointer to end of internal ram to get some stackspace for the first c-code */
 213        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
 214        clr.l %sp@-
 215
 216        move.l #__got_start, %a5                /* put relocation table address to a5 */
 217
 218        bsr cpu_init_f                          /* run low-level CPU init code (from flash) */
 219        bsr board_init_f                        /* run low-level board init code (from flash) */
 220
 221        /* board_init_f() does not return */
 222
 223/*------------------------------------------------------------------------------*/
 224
 225/*
 226 * void relocate_code (addr_sp, gd, addr_moni)
 227 *
 228 * This "function" does not return, instead it continues in RAM
 229 * after relocating the monitor code.
 230 *
 231 * r3 = dest
 232 * r4 = src
 233 * r5 = length in bytes
 234 * r6 = cachelinesize
 235 */
 236        .globl  relocate_code
 237relocate_code:
 238        link.w %a6,#0
 239        move.l 8(%a6), %sp              /* set new stack pointer */
 240
 241        move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 242        move.l 16(%a6), %a0             /* Save copy of Destination Address */
 243
 244        move.l #CONFIG_SYS_MONITOR_BASE, %a1
 245        move.l #__init_end, %a2
 246        move.l %a0, %a3
 247        /* copy the code to RAM */
 2481:
 249        move.l (%a1)+, (%a3)+
 250        cmp.l  %a1,%a2
 251        bgt.s    1b
 252
 253/*
 254 * We are done. Do not return, instead branch to second part of board
 255 * initialization, now running from RAM.
 256 */
 257        move.l  %a0, %a1
 258        add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 259        jmp     (%a1)
 260
 261in_ram:
 262
 263clear_bss:
 264        /*
 265         * Now clear BSS segment
 266         */
 267        move.l  %a0, %a1
 268        add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 269        move.l  %a0, %d1
 270        add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 2716:
 272        clr.l   (%a1)+
 273        cmp.l   %a1,%d1
 274        bgt.s   6b
 275
 276        /*
 277         * fix got table in RAM
 278         */
 279        move.l  %a0, %a1
 280        add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 281        move.l  %a1,%a5         /* * fix got pointer register a5 */
 282
 283        move.l  %a0, %a2
 284        add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 285
 2867:
 287        move.l  (%a1),%d1
 288        sub.l   #_start,%d1
 289        add.l   %a0,%d1
 290        move.l  %d1,(%a1)+
 291        cmp.l   %a2, %a1
 292        bne     7b
 293
 294        /* calculate relative jump to board_init_r in ram */
 295        move.l %a0, %a1
 296        add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 297
 298        /* set parameters for board_init_r */
 299        move.l %a0,-(%sp)               /* dest_addr */
 300        move.l %d0,-(%sp)               /* gd */
 301#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \
 302    defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
 303        halt
 304#endif
 305        jsr     (%a1)
 306
 307/*------------------------------------------------------------------------------*/
 308/* exception code */
 309        .globl _fault
 310_fault:
 311        jmp _fault
 312
 313        .globl  _exc_handler
 314_exc_handler:
 315        SAVE_ALL
 316        movel   %sp,%sp@-
 317        bsr exc_handler
 318        addql   #4,%sp
 319        RESTORE_ALL
 320
 321        .globl  _int_handler
 322_int_handler:
 323        SAVE_ALL
 324        movel   %sp,%sp@-
 325        bsr int_handler
 326        addql   #4,%sp
 327        RESTORE_ALL
 328
 329/*------------------------------------------------------------------------------*/
 330
 331        .globl  version_string
 332version_string:
 333        .ascii U_BOOT_VERSION
 334        .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
 335        .ascii CONFIG_IDENT_STRING, "\0"
 336        .align 4
 337