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#ifndef CONFIG_IDENT_STRING 17#define CONFIG_IDENT_STRING "" 18#endif 19 20#define _START _start 21#define _FAULT _fault 22 23#define SAVE_ALL \ 24 move.w #0x2700,%sr; /* disable intrs */ \ 25 subl #60,%sp; /* space for 15 regs */ \ 26 moveml %d0-%d7/%a0-%a6,%sp@; 27 28#define RESTORE_ALL \ 29 moveml %sp@,%d0-%d7/%a0-%a6; \ 30 addl #60,%sp; /* space for 15 regs */ \ 31 rte; 32 33#if !defined(CONFIG_MONITOR_IS_IN_RAM) 34.text 35/* 36 * Vector table. This is used for initial platform startup. 37 * These vectors are to catch any un-intended traps. 38 */ 39_vectors: 40 41INITSP: .long 0x00000000 /* Initial SP */ 42INITPC: .long _START /* Initial PC */ 43vector02: .long _FAULT /* Access Error */ 44vector03: .long _FAULT /* Address Error */ 45vector04: .long _FAULT /* Illegal Instruction */ 46vector05: .long _FAULT /* Reserved */ 47vector06: .long _FAULT /* Reserved */ 48vector07: .long _FAULT /* Reserved */ 49vector08: .long _FAULT /* Privilege Violation */ 50vector09: .long _FAULT /* Trace */ 51vector0A: .long _FAULT /* Unimplemented A-Line */ 52vector0B: .long _FAULT /* Unimplemented F-Line */ 53vector0C: .long _FAULT /* Debug Interrupt */ 54vector0D: .long _FAULT /* Reserved */ 55vector0E: .long _FAULT /* Format Error */ 56vector0F: .long _FAULT /* Unitialized Int. */ 57 58/* Reserved */ 59vector10_17: 60.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 61 62vector18: .long _FAULT /* Spurious Interrupt */ 63vector19: .long _FAULT /* Autovector Level 1 */ 64vector1A: .long _FAULT /* Autovector Level 2 */ 65vector1B: .long _FAULT /* Autovector Level 3 */ 66vector1C: .long _FAULT /* Autovector Level 4 */ 67vector1D: .long _FAULT /* Autovector Level 5 */ 68vector1E: .long _FAULT /* Autovector Level 6 */ 69vector1F: .long _FAULT /* Autovector Level 7 */ 70 71/* TRAP #0 - #15 */ 72vector20_2F: 73.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 74.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 75 76/* Reserved */ 77vector30_3F: 78.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 79.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 80 81vector64_127: 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.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 91vector128_191: 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 101vector192_255: 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#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */ 111 112 .text 113 114 .globl _start 115_start: 116 nop 117 nop 118 move.w #0x2700,%sr /* Mask off Interrupt */ 119 120#if !defined(CONFIG_MONITOR_IS_IN_RAM) 121 /* Set vector base register at the beginning of the Flash */ 122 move.l #CONFIG_SYS_FLASH_BASE, %d0 123 movec %d0, %VBR 124#endif 125 126 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 127 movec %d0, %RAMBAR1 128 129 /* invalidate and disable cache */ 130 move.l #CF_CACR_CINVA, %d0 /* Invalidate cache cmd */ 131 movec %d0, %CACR /* Invalidate cache */ 132 move.l #0, %d0 133 movec %d0, %ACR0 134 movec %d0, %ACR1 135 136#ifdef CONFIG_MCF5301x 137 move.l #(0xFC0a0010), %a0 138 move.w (%a0), %d0 139 and.l %d0, 0xEFFF 140 141 move.w %d0, (%a0) 142#endif 143 144 /* initialize general use internal ram */ 145 move.l #0, %d0 146 move.l #(ICACHE_STATUS), %a1 /* icache */ 147 move.l #(DCACHE_STATUS), %a2 /* icache */ 148 move.l %d0, (%a1) 149 move.l %d0, (%a2) 150 151 /* set stackpointer to end of internal ram to get some stackspace for the 152 first c-code */ 153 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 154 clr.l %sp@- 155 156 move.l #__got_start, %a5 /* put relocation table address to a5 */ 157 158 /* run low-level CPU init code (from flash) */ 159 move.l #cpu_init_f, %a1 160 jsr (%a1) 161 /* run low-level board init code (from flash) */ 162 move.l #board_init_f, %a1 163 jsr (%a1) 164 165 /* board_init_f() does not return */ 166 167/*------------------------------------------------------------------------------*/ 168 169/* 170 * void relocate_code (addr_sp, gd, addr_moni) 171 * 172 * This "function" does not return, instead it continues in RAM 173 * after relocating the monitor code. 174 * 175 * r3 = dest 176 * r4 = src 177 * r5 = length in bytes 178 * r6 = cachelinesize 179 */ 180 .globl relocate_code 181relocate_code: 182 link.w %a6,#0 183 move.l 8(%a6), %sp /* set new stack pointer */ 184 185 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 186 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 187 188 move.l #CONFIG_SYS_MONITOR_BASE, %a1 189 move.l #__init_end, %a2 190 move.l %a0, %a3 191 192 /* copy the code to RAM */ 1931: 194 move.l (%a1)+, (%a3)+ 195 cmp.l %a1,%a2 196 bgt.s 1b 197 198/* 199 * We are done. Do not return, instead branch to second part of board 200 * initialization, now running from RAM. 201 */ 202 move.l %a0, %a1 203 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 204 jmp (%a1) 205 206in_ram: 207 208clear_bss: 209 /* 210 * Now clear BSS segment 211 */ 212 move.l %a0, %a1 213 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 214 move.l %a0, %d1 215 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2166: 217 clr.l (%a1)+ 218 cmp.l %a1,%d1 219 bgt.s 6b 220 221 /* 222 * fix got table in RAM 223 */ 224 move.l %a0, %a1 225 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 226 move.l %a1,%a5 /* * fix got pointer register a5 */ 227 228 move.l %a0, %a2 229 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 230 2317: 232 move.l (%a1),%d1 233 sub.l #_start,%d1 234 add.l %a0,%d1 235 move.l %d1,(%a1)+ 236 cmp.l %a2, %a1 237 bne 7b 238 239 /* calculate relative jump to board_init_r in ram */ 240 move.l %a0, %a1 241 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 242 243 /* set parameters for board_init_r */ 244 move.l %a0,-(%sp) /* dest_addr */ 245 move.l %d0,-(%sp) /* gd */ 246 jsr (%a1) 247 248/*------------------------------------------------------------------------------*/ 249/* exception code */ 250 .globl _fault 251_fault: 252 bra _fault 253 .globl _exc_handler 254 255_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 .globl version_string 272version_string: 273 .ascii U_BOOT_VERSION_STRING, "\0" 274 .align 4 275