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 "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
  37#define SAVE_ALL                                                \
  38        move.w  #0x2700,%sr;            /* disable intrs */     \
  39        subl    #60,%sp;                /* space for 15 regs */ \
  40        moveml  %d0-%d7/%a0-%a6,%sp@;                           \
  41
  42#define RESTORE_ALL                                             \
  43        moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  44        addl    #60,%sp;                /* space for 15 regs */ \
  45        rte
  46
  47/* If we come from a pre-loader we don't need an initial exception
  48 * table.
  49 */
  50#if !defined(CONFIG_MONITOR_IS_IN_RAM)
  51
  52.text
  53/*
  54 *      Vector table. This is used for initial platform startup.
  55 *      These vectors are to catch any un-intended traps.
  56 */
  57_vectors:
  58
  59.long   0x00000000              /* Flash offset is 0 until we setup CS0 */
  60#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
  61.long   _start - CONFIG_SYS_TEXT_BASE
  62#else
  63.long   _START
  64#endif
  65
  66.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  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
  74
  75.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  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
  84.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  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
  93.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  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
 102#endif
 103
 104        .text
 105
 106
 107#if defined(CONFIG_SYS_INT_FLASH_BASE) && \
 108    (defined(CONFIG_M5282) || defined(CONFIG_M5281))
 109        #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 110                .long   0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */
 111                .long   0xFFFFFFFF /* all sectors protected */
 112                .long   0x00000000 /* supervisor/User restriction */
 113                .long   0x00000000 /* programm/data space restriction */
 114                .long   0x00000000 /* Flash security */
 115        #endif
 116#endif
 117        .globl  _start
 118_start:
 119        nop
 120        nop
 121        move.w #0x2700,%sr
 122
 123#if defined(CONFIG_M5208)
 124        /* Initialize RAMBAR: locate SRAM and validate it */
 125        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 126        movec   %d0, %RAMBAR1
 127#endif
 128
 129#if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
 130        move.l  #(CONFIG_SYS_MBAR + 1), %d0             /* set MBAR address + valid flag */
 131        move.c  %d0, %MBAR
 132
 133        /*** The 5249 has MBAR2 as well ***/
 134#ifdef CONFIG_SYS_MBAR2
 135        move.l  #(CONFIG_SYS_MBAR2 + 1), %d0            /* Get MBAR2 address */
 136        movec   %d0, #0xc0e                     /* Set MBAR2 */
 137#endif
 138
 139        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
 140        movec   %d0, %RAMBAR0
 141#endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
 142
 143#if defined(CONFIG_M5282) || defined(CONFIG_M5271)
 144        /* Initialize IPSBAR */
 145        move.l  #(CONFIG_SYS_MBAR + 1), %d0             /* set IPSBAR address + valid flag */
 146        move.l  %d0, 0x40000000
 147
 148        /* Initialize RAMBAR1: locate SRAM and validate it */
 149        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
 150        movec   %d0, %RAMBAR1
 151
 152#if defined(CONFIG_M5282)
 153#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 154        /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */
 155
 156        move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0
 157        move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1
 158        move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2
 159_copy_flash:
 160        move.l (%a0)+, (%a2)+
 161        cmp.l %a0, %a1
 162        bgt.s _copy_flash
 163        jmp CONFIG_SYS_INIT_RAM_ADDR
 164
 165_flashbar_setup:
 166        /* Initialize FLASHBAR: locate internal Flash and validate it */
 167        move.l  #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
 168        movec   %d0, %FLASHBAR
 169        jmp _after_flashbar_copy.L      /* Force jump to absolute address */
 170_flashbar_setup_end:
 171        nop
 172_after_flashbar_copy:
 173#else
 174        /* Setup code to initialize FLASHBAR, if start from external Memory */
 175        move.l  #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
 176        movec   %d0, %FLASHBAR
 177#endif /* (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */
 178
 179#endif
 180#endif
 181        /* if we come from a pre-loader we have no exception table and
 182         * therefore no VBR to set
 183         */
 184#if !defined(CONFIG_MONITOR_IS_IN_RAM)
 185#if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 186        move.l  #CONFIG_SYS_INT_FLASH_BASE, %d0
 187#else
 188        move.l  #CONFIG_SYS_FLASH_BASE, %d0
 189#endif
 190        movec   %d0, %VBR
 191#endif
 192
 193#ifdef CONFIG_M5275
 194        /* Initialize IPSBAR */
 195        move.l  #(CONFIG_SYS_MBAR + 1), %d0             /* set IPSBAR address + valid flag */
 196        move.l  %d0, 0x40000000
 197/*      movec   %d0, %MBAR */
 198
 199        /* Initialize RAMBAR: locate SRAM and validate it */
 200        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
 201        movec   %d0, %RAMBAR1
 202#endif
 203
 204        /* initialize general use internal ram */
 205        move.l #0, %d0
 206        move.l #(ICACHE_STATUS), %a1    /* icache */
 207        move.l #(DCACHE_STATUS), %a2    /* icache */
 208        move.l %d0, (%a1)
 209        move.l %d0, (%a2)
 210
 211        /* set stackpointer to end of internal ram to get some stackspace for the first c-code */
 212        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
 213        clr.l %sp@-
 214
 215        move.l #__got_start, %a5                /* put relocation table address to a5 */
 216
 217        bsr cpu_init_f                          /* run low-level CPU init code (from flash) */
 218        bsr board_init_f                        /* run low-level board init code (from flash) */
 219
 220        /* board_init_f() does not return */
 221
 222/*------------------------------------------------------------------------------*/
 223
 224/*
 225 * void relocate_code (addr_sp, gd, addr_moni)
 226 *
 227 * This "function" does not return, instead it continues in RAM
 228 * after relocating the monitor code.
 229 *
 230 * r3 = dest
 231 * r4 = src
 232 * r5 = length in bytes
 233 * r6 = cachelinesize
 234 */
 235        .globl  relocate_code
 236relocate_code:
 237        link.w %a6,#0
 238        move.l 8(%a6), %sp              /* set new stack pointer */
 239
 240        move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 241        move.l 16(%a6), %a0             /* Save copy of Destination Address */
 242
 243        move.l #CONFIG_SYS_MONITOR_BASE, %a1
 244        move.l #__init_end, %a2
 245        move.l %a0, %a3
 246        /* copy the code to RAM */
 2471:
 248        move.l (%a1)+, (%a3)+
 249        cmp.l  %a1,%a2
 250        bgt.s    1b
 251
 252/*
 253 * We are done. Do not return, instead branch to second part of board
 254 * initialization, now running from RAM.
 255 */
 256        move.l  %a0, %a1
 257        add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 258        jmp     (%a1)
 259
 260in_ram:
 261
 262clear_bss:
 263        /*
 264         * Now clear BSS segment
 265         */
 266        move.l  %a0, %a1
 267        add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 268        move.l  %a0, %d1
 269        add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 2706:
 271        clr.l   (%a1)+
 272        cmp.l   %a1,%d1
 273        bgt.s   6b
 274
 275        /*
 276         * fix got table in RAM
 277         */
 278        move.l  %a0, %a1
 279        add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 280        move.l  %a1,%a5         /* * fix got pointer register a5 */
 281
 282        move.l  %a0, %a2
 283        add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 284
 2857:
 286        move.l  (%a1),%d1
 287        sub.l   #_start,%d1
 288        add.l   %a0,%d1
 289        move.l  %d1,(%a1)+
 290        cmp.l   %a2, %a1
 291        bne     7b
 292
 293        /* calculate relative jump to board_init_r in ram */
 294        move.l %a0, %a1
 295        add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 296
 297        /* set parameters for board_init_r */
 298        move.l %a0,-(%sp)               /* dest_addr */
 299        move.l %d0,-(%sp)               /* gd */
 300#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \
 301    defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
 302        halt
 303#endif
 304        jsr     (%a1)
 305
 306/*------------------------------------------------------------------------------*/
 307/* exception code */
 308        .globl _fault
 309_fault:
 310        jmp _fault
 311
 312        .globl  _exc_handler
 313_exc_handler:
 314        SAVE_ALL
 315        movel   %sp,%sp@-
 316        bsr exc_handler
 317        addql   #4,%sp
 318        RESTORE_ALL
 319
 320        .globl  _int_handler
 321_int_handler:
 322        SAVE_ALL
 323        movel   %sp,%sp@-
 324        bsr int_handler
 325        addql   #4,%sp
 326        RESTORE_ALL
 327
 328/*------------------------------------------------------------------------------*/
 329
 330        .globl  version_string
 331version_string:
 332        .ascii U_BOOT_VERSION_STRING, "\0"
 333        .align 4
 334