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
  57 INITSP:         .long   0x00000000      /* Initial SP   */
  58 INITPC:         .long   _START  /* Initial PC           */
  59 vector02:       .long   _FAULT  /* Access Error         */
  60 vector03:       .long   _FAULT  /* Address Error        */
  61 vector04:       .long   _FAULT  /* Illegal Instruction  */
  62 vector05:       .long   _FAULT  /* Reserved             */
  63 vector06:       .long   _FAULT  /* Reserved             */
  64 vector07:       .long   _FAULT  /* Reserved             */
  65 vector08:       .long   _FAULT  /* Privilege Violation  */
  66 vector09:       .long   _FAULT  /* Trace                */
  67 vector0A:       .long   _FAULT  /* Unimplemented A-Line */
  68 vector0B:       .long   _FAULT  /* Unimplemented F-Line */
  69 vector0C:       .long   _FAULT  /* Debug Interrupt      */
  70 vector0D:       .long   _FAULT  /* Reserved             */
  71 vector0E:       .long   _FAULT  /* Format Error         */
  72 vector0F:       .long   _FAULT  /* Unitialized Int.     */
  73
  74 /* Reserved */
  75 vector10_17:
  76 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  77
  78 vector18:       .long   _FAULT  /* Spurious Interrupt   */
  79 vector19:       .long   _FAULT  /* Autovector Level 1   */
  80 vector1A:       .long   _FAULT  /* Autovector Level 2   */
  81 vector1B:       .long   _FAULT  /* Autovector Level 3   */
  82 vector1C:       .long   _FAULT  /* Autovector Level 4   */
  83 vector1D:       .long   _FAULT  /* Autovector Level 5   */
  84 vector1E:       .long   _FAULT  /* Autovector Level 6   */
  85 vector1F:       .long   _FAULT  /* Autovector Level 7   */
  86
  87 /* TRAP #0 - #15 */
  88 vector20_2F:
  89 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  90 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  91
  92 /* Reserved     */
  93 vector30_3F:
  94 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  95 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  96
  97 vector64_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
 107 vector128_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
 117 vector192_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
 193 relocate_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 */
 205 1:
 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
 218 in_ram:
 219
 220 clear_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
 228 6:
 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
 243 7:
 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         jmp _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
 284 version_string:
 285         .ascii U_BOOT_VERSION_STRING, "\0"
 286         .align 4