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  * 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 <config.h>
  25 #include "version.h"
  26
  27 #ifndef  CONFIG_IDENT_STRING
  28 #define  CONFIG_IDENT_STRING ""
  29 #endif
  30
  31 #define _START  _start
  32 #define _FAULT  _fault
  33
  34 #define SAVE_ALL                                                \
  35         move.w  #0x2700,%sr;            /* disable intrs */     \
  36         subl    #60,%sp;                /* space for 15 regs */ \
  37         moveml  %d0-%d7/%a0-%a6,%sp@;
  38
  39 #define RESTORE_ALL                                             \
  40         moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  41         addl    #60,%sp;                /* space for 15 regs */ \
  42         rte;
  43
  44 .text
  45 /*
  46  *      Vector table. This is used for initial platform startup.
  47  *      These vectors are to catch any un-intended traps.
  48  */
  49 _vectors:
  50
  51 INITSP:         .long   0x00000000      /* Initial SP   */
  52 INITPC:         .long   _START  /* Initial PC           */
  53 vector02:       .long   _FAULT  /* Access Error         */
  54 vector03:       .long   _FAULT  /* Address Error        */
  55 vector04:       .long   _FAULT  /* Illegal Instruction  */
  56 vector05:       .long   _FAULT  /* Reserved             */
  57 vector06:       .long   _FAULT  /* Reserved             */
  58 vector07:       .long   _FAULT  /* Reserved             */
  59 vector08:       .long   _FAULT  /* Privilege Violation  */
  60 vector09:       .long   _FAULT  /* Trace                */
  61 vector0A:       .long   _FAULT  /* Unimplemented A-Line */
  62 vector0B:       .long   _FAULT  /* Unimplemented F-Line */
  63 vector0C:       .long   _FAULT  /* Debug Interrupt      */
  64 vector0D:       .long   _FAULT  /* Reserved             */
  65 vector0E:       .long   _FAULT  /* Format Error         */
  66 vector0F:       .long   _FAULT  /* Unitialized Int.     */
  67
  68 /* Reserved */
  69 vector10_17:
  70 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  71
  72 vector18:       .long   _FAULT  /* Spurious Interrupt   */
  73 vector19:       .long   _FAULT  /* Autovector Level 1   */
  74 vector1A:       .long   _FAULT  /* Autovector Level 2   */
  75 vector1B:       .long   _FAULT  /* Autovector Level 3   */
  76 vector1C:       .long   _FAULT  /* Autovector Level 4   */
  77 vector1D:       .long   _FAULT  /* Autovector Level 5   */
  78 vector1E:       .long   _FAULT  /* Autovector Level 6   */
  79 vector1F:       .long   _FAULT  /* Autovector Level 7   */
  80
  81 /* TRAP #0 - #15 */
  82 vector20_2F:
  83 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  84 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  85
  86 /* Reserved     */
  87 vector30_3F:
  88 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  89 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  90
  91 vector64_127:
  92 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  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
 101 vector128_191:
 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 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 107 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 108 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 109 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 110
 111 vector192_255:
 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 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 117 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 118 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 119 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 120
 121         .text
 122
 123         .globl  _start
 124 _start:
 125         nop
 126         nop
 127         move.w #0x2700,%sr      /* Mask off Interrupt */
 128
 129         /* Set vector base register at the beginning of the Flash */
 130         move.l  #CONFIG_SYS_FLASH_BASE, %d0
 131         movec   %d0, %VBR
 132
 133         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 134         movec   %d0, %RAMBAR1
 135
 136         /* invalidate and disable cache */
 137         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 138         movec   %d0, %CACR                      /* Invalidate cache */
 139         move.l  #0, %d0
 140         movec   %d0, %ACR0
 141         movec   %d0, %ACR1
 142
 143         /* initialize general use internal ram */
 144         move.l #0, %d0
 145         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 146         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a2
 147         move.l %d0, (%a1)
 148         move.l %d0, (%a2)
 149
 150         /* set stackpointer to end of internal ram to get some stackspace for the
 151            first c-code */
 152         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
 153         clr.l %sp@-
 154
 155         move.l #__got_start, %a5        /* put relocation table address to a5 */
 156
 157         bsr cpu_init_f                  /* run low-level CPU init code (from flash) */
 158         bsr board_init_f                /* run low-level board init code (from flash) */
 159
 160         /* board_init_f() does not return */
 161
 162 /*------------------------------------------------------------------------------*/
 163
 164 /*
 165  * void relocate_code (addr_sp, gd, addr_moni)
 166  *
 167  * This "function" does not return, instead it continues in RAM
 168  * after relocating the monitor code.
 169  *
 170  * r3 = dest
 171  * r4 = src
 172  * r5 = length in bytes
 173  * r6 = cachelinesize
 174  */
 175         .globl  relocate_code
 176 relocate_code:
 177         link.w %a6,#0
 178         move.l 8(%a6), %sp              /* set new stack pointer */
 179
 180         move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 181         move.l 16(%a6), %a0             /* Save copy of Destination Address */
 182
 183         move.l #CONFIG_SYS_MONITOR_BASE, %a1
 184         move.l #__init_end, %a2
 185         move.l %a0, %a3
 186
 187         /* copy the code to RAM */
 188 1:
 189         move.l (%a1)+, (%a3)+
 190         cmp.l  %a1,%a2
 191         bgt.s    1b
 192
 193 /*
 194  * We are done. Do not return, instead branch to second part of board
 195  * initialization, now running from RAM.
 196  */
 197         move.l  %a0, %a1
 198         add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 199         jmp     (%a1)
 200
 201 in_ram:
 202
 203 clear_bss:
 204         /*
 205          * Now clear BSS segment
 206          */
 207         move.l  %a0, %a1
 208         add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 209         move.l  %a0, %d1
 210         add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 211 6:
 212         clr.l   (%a1)+
 213         cmp.l   %a1,%d1
 214         bgt.s   6b
 215
 216         /*
 217          * fix got table in RAM
 218          */
 219         move.l  %a0, %a1
 220         add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 221         move.l  %a1,%a5         /* * fix got pointer register a5 */
 222
 223         move.l  %a0, %a2
 224         add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 225
 226 7:
 227         move.l  (%a1),%d1
 228         sub.l   #_start,%d1
 229         add.l   %a0,%d1
 230         move.l  %d1,(%a1)+
 231         cmp.l   %a2, %a1
 232         bne     7b
 233
 234         /* calculate relative jump to board_init_r in ram */
 235         move.l %a0, %a1
 236         add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 237
 238         /* set parameters for board_init_r */
 239         move.l %a0,-(%sp)               /* dest_addr */
 240         move.l %d0,-(%sp)               /* gd */
 241         jsr     (%a1)
 242
 243 /*------------------------------------------------------------------------------*/
 244 /* exception code */
 245         .globl _fault
 246 _fault:
 247         jmp _fault
 248         .globl  _exc_handler
 249
 250 _exc_handler:
 251         SAVE_ALL
 252         movel   %sp,%sp@-
 253         bsr exc_handler
 254         addql   #4,%sp
 255         RESTORE_ALL
 256
 257         .globl  _int_handler
 258 _int_handler:
 259         SAVE_ALL
 260         movel   %sp,%sp@-
 261         bsr int_handler
 262         addql   #4,%sp
 263         RESTORE_ALL
 264
 265 /*------------------------------------------------------------------------------*/
 266 /* cache functions */
 267         .globl  icache_enable
 268 icache_enable:
 269         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 270         movec   %d0, %CACR                      /* Invalidate cache */
 271         move.l  #(CONFIG_SYS_SDRAM_BASE + 0x1c000), %d0
 272         movec   %d0, %ACR0                      /* Enable cache */
 273
 274         move.l  #0x80000200, %d0                /* Setup cache mask */
 275         movec   %d0, %CACR                      /* Enable cache */
 276         nop
 277
 278         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 279         moveq   #1, %d0
 280         move.l  %d0, (%a1)
 281         rts
 282
 283         .globl  icache_disable
 284 icache_disable:
 285         move.l  #0x01000000, %d0                /* Setup cache mask */
 286         movec   %d0, %CACR                      /* Disable cache */
 287         clr.l   %d0                             /* Setup cache mask */
 288         movec   %d0, %ACR0
 289         movec   %d0, %ACR1
 290
 291         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 292         moveq   #0, %d0
 293         move.l  %d0, (%a1)
 294         rts
 295
 296         .globl  icache_status
 297 icache_status:
 298         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 299         move.l  (%a1), %d0
 300         rts
 301
 302         .globl  icache_invalid
 303 icache_invalid:
 304         move.l  #0x81000200, %d0                /* Setup cache mask */
 305         movec   %d0, %CACR                      /* Enable cache */
 306         rts
 307
 308         .globl  dcache_enable
 309 dcache_enable:
 310         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a1
 311         moveq   #1, %d0
 312         move.l  %d0, (%a1)
 313         rts
 314
 315     /* No dcache, just a dummy function */
 316         .globl  dcache_disable
 317 dcache_disable:
 318         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a1
 319         moveq   #0, %d0
 320         move.l  %d0, (%a1)
 321         rts
 322
 323         .globl  dcache_status
 324 dcache_status:
 325         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a1
 326         move.l  (%a1), %d0
 327         rts
 328
 329 /*------------------------------------------------------------------------------*/
 330
 331         .globl  version_string
 332 version_string:
 333         .ascii U_BOOT_VERSION
 334         .ascii " (", __DATE__, " - ", __TIME__, ")"
 335         .ascii CONFIG_IDENT_STRING, "\0"
 336         .align 4