arch/m68k/cpu/mcf547x_8x/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  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <asm-offsets.h>
   9 #include <config.h>
  10 #include "version.h"
  11 #include <asm/cache.h>
  12
  13 #define _START  _start
  14 #define _FAULT  _fault
  15
  16 #define SAVE_ALL                                                \
  17         move.w  #0x2700,%sr;            /* disable intrs */     \
  18         subl    #60,%sp;                /* space for 15 regs */ \
  19         moveml  %d0-%d7/%a0-%a6,%sp@;
  20
  21 #define RESTORE_ALL                                             \
  22         moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  23         addl    #60,%sp;                /* space for 15 regs */ \
  24         rte;
  25
  26 .text
  27
  28 /*
  29  * Vector table. This is used for initial platform startup.
  30  * These vectors are to catch any un-intended traps.
  31  */
  32 _vectors:
  33 INITSP: .long   0x00000000              /* Initial SP   */
  34 INITPC: .long   _START                  /* Initial PC   */
  35
  36 vector02_0F:
  37 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  38 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  39
  40 /* Reserved */
  41 vector10_17:
  42 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  43
  44 vector18_1F:
  45 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  46
  47 /* TRAP #0 - #15 */
  48 vector20_2F:
  49 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  50 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  51
  52 /* Reserved     */
  53 vector30_3F:
  54 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  55 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  56
  57 vector64_127:
  58 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  59 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  60 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  61 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  62 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  63 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  64 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  65 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  66
  67 vector128_191:
  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, _FAULT, _FAULT
  75 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  76
  77 vector192_255:
  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 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  85 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  86
  87 .text
  88
  89 .globl _start
  90 _start:
  91         nop
  92         nop
  93         move.w  #0x2700,%sr             /* Mask off Interrupt */
  94
  95         /* Set vector base register at the beginning of the Flash */
  96         move.l  #CONFIG_SYS_FLASH_BASE, %d0
  97         movec   %d0, %VBR
  98
  99         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 100         movec   %d0, %RAMBAR0
 101
 102         move.l  #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0
 103         movec   %d0, %RAMBAR1
 104
 105         move.l  #CONFIG_SYS_MBAR, %d0   /* set MBAR address */
 106         move.c  %d0, %MBAR
 107
 108         /* invalidate and disable cache */
 109         move.l  #0x01040100, %d0        /* Invalidate cache cmd */
 110         movec   %d0, %CACR              /* Invalidate cache */
 111         move.l  #0, %d0
 112         movec   %d0, %ACR0
 113         movec   %d0, %ACR1
 114         movec   %d0, %ACR2
 115         movec   %d0, %ACR3
 116
 117         /* initialize general use internal ram */
 118         move.l  #0, %d0
 119         move.l  #(ICACHE_STATUS), %a1   /* icache */
 120         move.l  #(DCACHE_STATUS), %a2   /* icache */
 121         move.l  %d0, (%a1)
 122         move.l  %d0, (%a2)
 123
 124         /* put relocation table address to a5 */
 125         move.l  #__got_start, %a5
 126
 127         /* setup stack initially on top of internal static ram  */
 128         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp
 129
 130         /*
 131          * if configured, malloc_f arena will be reserved first,
 132          * then (and always) gd struct space will be reserved
 133          */
 134         move.l  %sp, -(%sp)
 135         bsr     board_init_f_alloc_reserve
 136
 137         /* update stack and frame-pointers */
 138         move.l  %d0, %sp
 139         move.l  %sp, %fp
 140
 141         /* initialize reserved area */
 142         move.l  %d0, -(%sp)
 143         bsr     board_init_f_init_reserve
 144
 145         /* run low-level CPU init code (from flash) */
 146         jbsr    cpu_init_f
 147
 148         /* run low-level board init code (from flash) */
 149         clr.l   %sp@-
 150         jbsr    board_init_f
 151
 152         /* board_init_f() does not return */
 153
 154 /******************************************************************************/
 155
 156 /*
 157  * void relocate_code (addr_sp, gd, addr_moni)
 158  *
 159  * This "function" does not return, instead it continues in RAM
 160  * after relocating the monitor code.
 161  *
 162  * r3 = dest
 163  * r4 = src
 164  * r5 = length in bytes
 165  * r6 = cachelinesize
 166  */
 167 .globl relocate_code
 168 relocate_code:
 169         link.w  %a6,#0
 170         move.l  8(%a6), %sp             /* set new stack pointer */
 171
 172         move.l  12(%a6), %d0            /* Save copy of Global Data pointer */
 173         move.l  16(%a6), %a0            /* Save copy of Destination Address */
 174
 175         move.l  #CONFIG_SYS_MONITOR_BASE, %a1
 176         move.l  #__init_end, %a2
 177         move.l  %a0, %a3
 178
 179         /* copy the code to RAM */
 180 1:
 181         move.l  (%a1)+, (%a3)+
 182         cmp.l   %a1,%a2
 183         bgt.s   1b
 184
 185 /*
 186  * We are done. Do not return, instead branch to second part of board
 187  * initialization, now running from RAM.
 188  */
 189         move.l  %a0, %a1
 190         add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 191         jmp     (%a1)
 192
 193 in_ram:
 194
 195 clear_bss:
 196         /*
 197          * Now clear BSS segment
 198          */
 199         move.l  %a0, %a1
 200         add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 201         move.l  %a0, %d1
 202         add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 203 6:
 204         clr.l   (%a1)+
 205         cmp.l   %a1,%d1
 206         bgt.s   6b
 207
 208         /*
 209          * fix got table in RAM
 210          */
 211         move.l  %a0, %a1
 212         add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 213         move.l  %a1,%a5                 /* fix got pointer register a5 */
 214
 215         move.l  %a0, %a2
 216         add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 217
 218 7:
 219         move.l  (%a1),%d1
 220         sub.l   #_start,%d1
 221         add.l   %a0,%d1
 222         move.l  %d1,(%a1)+
 223         cmp.l   %a2, %a1
 224         bne     7b
 225
 226         /* calculate relative jump to board_init_r in ram */
 227         move.l  %a0, %a1
 228         add.l   #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 229
 230         /* set parameters for board_init_r */
 231         move.l  %a0,-(%sp)              /* dest_addr */
 232         move.l  %d0,-(%sp)              /* gd */
 233         jsr     (%a1)
 234
 235 /******************************************************************************/
 236
 237 /* exception code */
 238 .globl _fault
 239 _fault:
 240         bra     _fault
 241
 242 .globl _exc_handler
 243 _exc_handler:
 244         SAVE_ALL
 245         movel   %sp,%sp@-
 246         bsr     exc_handler
 247         addql   #4,%sp
 248         RESTORE_ALL
 249
 250 .globl _int_handler
 251 _int_handler:
 252         SAVE_ALL
 253         movel   %sp,%sp@-
 254         bsr     int_handler
 255         addql   #4,%sp
 256         RESTORE_ALL
 257
 258 /******************************************************************************/
 259
 260 .globl version_string
 261 version_string:
 262 .ascii U_BOOT_VERSION_STRING, "\0"
 263 .align 4