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  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <asm-offsets.h>
  12 #include <config.h>
  13 #include "version.h"
  14 #include <asm/cache.h>
  15
  16 #define _START  _start
  17 #define _FAULT  _fault
  18
  19 #define SAVE_ALL                                                \
  20         move.w  #0x2700,%sr;            /* disable intrs */     \
  21         subl    #60,%sp;                /* space for 15 regs */ \
  22         moveml  %d0-%d7/%a0-%a6,%sp@;
  23
  24 #define RESTORE_ALL                                             \
  25         moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  26         addl    #60,%sp;                /* space for 15 regs */ \
  27         rte;
  28
  29 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
  30
  31 .text
  32
  33 /*
  34  * Vector table. This is used for initial platform startup.
  35  * These vectors are to catch any un-intended traps.
  36  */
  37 _vectors:
  38 INITSP: .long   0x00000000              /* Initial SP   */
  39 INITPC: .long   _START                  /* Initial PC           */
  40
  41 vector02_0F:
  42 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  43 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  44
  45 /* Reserved */
  46 vector10_17:
  47 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  48
  49 vector18_1F:
  50 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  51
  52 /* TRAP #0 - #15 */
  53 vector20_2F:
  54 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  55 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  56
  57 /* Reserved     */
  58 vector30_3F:
  59 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  60 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  61
  62 vector64_127:
  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 .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
  72 vector128_191:
  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 .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
  82 vector192_255:
  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 .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 #endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */
  92
  93 .text
  94
  95 .globl _start
  96 _start:
  97         nop
  98         nop
  99         move.w  #0x2700,%sr     /* Mask off Interrupt */
 100
 101 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
 102         /* Set vector base register at the beginning of the Flash */
 103         move.l  #CONFIG_SYS_FLASH_BASE, %d0
 104         movec   %d0, %VBR
 105 #endif
 106
 107         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 108         movec   %d0, %RAMBAR1
 109
 110         /* invalidate and disable cache */
 111         move.l  #CF_CACR_CINVA, %d0             /* Invalidate cache cmd */
 112         movec   %d0, %CACR                      /* Invalidate cache */
 113         move.l  #0, %d0
 114         movec   %d0, %ACR0
 115         movec   %d0, %ACR1
 116
 117 #ifdef CONFIG_MCF5301x
 118         move.l  #(0xFC0a0010), %a0
 119         move.w  (%a0), %d0
 120         and.l   %d0, 0xEFFF
 121
 122         move.w  %d0, (%a0)
 123 #endif
 124
 125         /* initialize general use internal ram */
 126         move.l  #0, %d0
 127         move.l  #(ICACHE_STATUS), %a1   /* icache */
 128         move.l  #(DCACHE_STATUS), %a2   /* icache */
 129         move.l  %d0, (%a1)
 130         move.l  %d0, (%a2)
 131
 132         /* put relocation table address to a5 */
 133         move.l  #__got_start, %a5
 134
 135         /* setup stack initially on top of internal static ram  */
 136         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp
 137
 138         /*
 139          * if configured, malloc_f arena will be reserved first,
 140          * then (and always) gd struct space will be reserved
 141          */
 142         move.l  %sp, -(%sp)
 143         move.l  #board_init_f_alloc_reserve, %a1
 144         jsr     (%a1)
 145
 146         /* update stack and frame-pointers */
 147         move.l  %d0, %sp
 148         move.l  %sp, %fp
 149
 150         /* initialize reserved area */
 151         move.l  %d0, -(%sp)
 152         move.l  #board_init_f_init_reserve, %a1
 153         jsr     (%a1)
 154
 155         /* run low-level CPU init code (from flash) */
 156         move.l  #cpu_init_f, %a1
 157         jsr     (%a1)
 158
 159         /* run low-level board init code (from flash) */
 160         clr.l   %sp@-
 161         move.l #board_init_f, %a1
 162         jsr (%a1)
 163
 164         /* board_init_f() does not return */
 165
 166 /******************************************************************************/
 167
 168 /*
 169  * void relocate_code (addr_sp, gd, addr_moni)
 170  *
 171  * This "function" does not return, instead it continues in RAM
 172  * after relocating the monitor code.
 173  *
 174  * r3 = dest
 175  * r4 = src
 176  * r5 = length in bytes
 177  * r6 = cachelinesize
 178  */
 179 .globl relocate_code
 180 relocate_code:
 181         link.w  %a6,#0
 182         move.l  8(%a6), %sp             /* set new stack pointer */
 183
 184         move.l  12(%a6), %d0            /* Save copy of Global Data pointer */
 185         move.l  16(%a6), %a0            /* Save copy of Destination Address */
 186
 187         move.l  #CONFIG_SYS_MONITOR_BASE, %a1
 188         move.l  #__init_end, %a2
 189         move.l  %a0, %a3
 190
 191         /* copy the code to RAM */
 192 1:
 193         move.l  (%a1)+, (%a3)+
 194         cmp.l   %a1,%a2
 195         bgt.s   1b
 196
 197 /*
 198  * We are done. Do not return, instead branch to second part of board
 199  * initialization, now running from RAM.
 200  */
 201         move.l  %a0, %a1
 202         add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 203         jmp     (%a1)
 204
 205 in_ram:
 206
 207 clear_bss:
 208         /*
 209          * Now clear BSS segment
 210          */
 211         move.l  %a0, %a1
 212         add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 213         move.l  %a0, %d1
 214         add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 215 6:
 216         clr.l   (%a1)+
 217         cmp.l   %a1,%d1
 218         bgt.s   6b
 219
 220         /*
 221          * fix got table in RAM
 222          */
 223         move.l  %a0, %a1
 224         add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 225         move.l  %a1,%a5                 /* fix got pointer register a5 */
 226
 227         move.l  %a0, %a2
 228         add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 229
 230 7:
 231         move.l  (%a1),%d1
 232         sub.l   #_start,%d1
 233         add.l   %a0,%d1
 234         move.l  %d1,(%a1)+
 235         cmp.l   %a2, %a1
 236         bne     7b
 237
 238         /* calculate relative jump to board_init_r in ram */
 239         move.l  %a0, %a1
 240         add.l   #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 241
 242         /* set parameters for board_init_r */
 243         move.l  %a0,-(%sp)              /* dest_addr */
 244         move.l  %d0,-(%sp)              /* gd */
 245         jsr     (%a1)
 246
 247 /******************************************************************************/
 248
 249 /* exception code */
 250 .globl _fault
 251 _fault:
 252         bra _fault
 253
 254 .globl _exc_handler
 255 _exc_handler:
 256         SAVE_ALL
 257         movel   %sp,%sp@-
 258         bsr     exc_handler
 259         addql   #4,%sp
 260         RESTORE_ALL
 261
 262 .globl _int_handler
 263 _int_handler:
 264         SAVE_ALL
 265         movel   %sp,%sp@-
 266         bsr     int_handler
 267         addql   #4,%sp
 268         RESTORE_ALL
 269
 270 /******************************************************************************/
 271
 272 .globl version_string
 273 version_string:
 274 .ascii U_BOOT_VERSION_STRING, "\0"
 275 .align 4