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 35.text 36 37/* 38 * Vector table. This is used for initial platform startup. 39 * These vectors are to catch any un-intended traps. 40 */ 41_vectors: 42INITSP: .long 0x00000000 /* Initial SP */ 43INITPC: .long _START /* Initial PC */ 44 45vector02_0F: 46.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 47.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 48 49/* Reserved */ 50vector10_17: 51.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 52 53vector18_1F: 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55 56/* TRAP #0 - #15 */ 57vector20_2F: 58.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 59.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 60 61/* Reserved */ 62vector30_3F: 63.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 64.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 65 66vector64_127: 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.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 76vector128_191: 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.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 86vector192_255: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */ 96 97.text 98 99.globl _start 100_start: 101 nop 102 nop 103 move.w #0x2700,%sr /* Mask off Interrupt */ 104 105#if !defined(CONFIG_MONITOR_IS_IN_RAM) 106 /* Set vector base register at the beginning of the Flash */ 107 move.l #CONFIG_SYS_FLASH_BASE, %d0 108 movec %d0, %VBR 109#endif 110 111 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 112 movec %d0, %RAMBAR1 113 114 /* invalidate and disable cache */ 115 move.l #CF_CACR_CINVA, %d0 /* Invalidate cache cmd */ 116 movec %d0, %CACR /* Invalidate cache */ 117 move.l #0, %d0 118 movec %d0, %ACR0 119 movec %d0, %ACR1 120 121#ifdef CONFIG_MCF5301x 122 move.l #(0xFC0a0010), %a0 123 move.w (%a0), %d0 124 and.l %d0, 0xEFFF 125 126 move.w %d0, (%a0) 127#endif 128 129 /* initialize general use internal ram */ 130 move.l #0, %d0 131 move.l #(ICACHE_STATUS), %a1 /* icache */ 132 move.l #(DCACHE_STATUS), %a2 /* icache */ 133 move.l %d0, (%a1) 134 move.l %d0, (%a2) 135 136 /* put relocation table address to a5 */ 137 move.l #__got_start, %a5 138 139 /* setup stack initially on top of internal static ram */ 140 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 141 142 /* 143 * if configured, malloc_f arena will be reserved first, 144 * then (and always) gd struct space will be reserved 145 */ 146 move.l %sp, -(%sp) 147 move.l #board_init_f_alloc_reserve, %a1 148 jsr (%a1) 149 150 /* update stack and frame-pointers */ 151 move.l %d0, %sp 152 move.l %sp, %fp 153 154 /* initialize reserved area */ 155 move.l %d0, -(%sp) 156 move.l #board_init_f_init_reserve, %a1 157 jsr (%a1) 158 159 /* run low-level CPU init code (from flash) */ 160 move.l #cpu_init_f, %a1 161 jsr (%a1) 162 163 /* run low-level board init code (from flash) */ 164 clr.l %sp@- 165 move.l #board_init_f, %a1 166 jsr (%a1) 167 168 /* board_init_f() does not return */ 169 170/******************************************************************************/ 171 172/* 173 * void relocate_code (addr_sp, gd, addr_moni) 174 * 175 * This "function" does not return, instead it continues in RAM 176 * after relocating the monitor code. 177 * 178 * r3 = dest 179 * r4 = src 180 * r5 = length in bytes 181 * r6 = cachelinesize 182 */ 183.globl relocate_code 184relocate_code: 185 link.w %a6,#0 186 move.l 8(%a6), %sp /* set new stack pointer */ 187 188 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 189 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 190 191 move.l #CONFIG_SYS_MONITOR_BASE, %a1 192 move.l #__init_end, %a2 193 move.l %a0, %a3 194 195 /* copy the code to RAM */ 1961: 197 move.l (%a1)+, (%a3)+ 198 cmp.l %a1,%a2 199 bgt.s 1b 200 201/* 202 * We are done. Do not return, instead branch to second part of board 203 * initialization, now running from RAM. 204 */ 205 move.l %a0, %a1 206 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 207 jmp (%a1) 208 209in_ram: 210 211clear_bss: 212 /* 213 * Now clear BSS segment 214 */ 215 move.l %a0, %a1 216 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 217 move.l %a0, %d1 218 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2196: 220 clr.l (%a1)+ 221 cmp.l %a1,%d1 222 bgt.s 6b 223 224 /* 225 * fix got table in RAM 226 */ 227 move.l %a0, %a1 228 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 229 move.l %a1,%a5 /* fix got pointer register a5 */ 230 231 move.l %a0, %a2 232 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 233 2347: 235 move.l (%a1),%d1 236 sub.l #_start,%d1 237 add.l %a0,%d1 238 move.l %d1,(%a1)+ 239 cmp.l %a2, %a1 240 bne 7b 241 242 /* calculate relative jump to board_init_r in ram */ 243 move.l %a0, %a1 244 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 245 246 /* set parameters for board_init_r */ 247 move.l %a0,-(%sp) /* dest_addr */ 248 move.l %d0,-(%sp) /* gd */ 249 jsr (%a1) 250 251/******************************************************************************/ 252 253/* exception code */ 254.globl _fault 255_fault: 256 bra _fault 257 258.globl _exc_handler 259_exc_handler: 260 SAVE_ALL 261 movel %sp,%sp@- 262 bsr exc_handler 263 addql #4,%sp 264 RESTORE_ALL 265 266.globl _int_handler 267_int_handler: 268 SAVE_ALL 269 movel %sp,%sp@- 270 bsr int_handler 271 addql #4,%sp 272 RESTORE_ALL 273 274/******************************************************************************/ 275 276.globl version_string 277version_string: 278.ascii U_BOOT_VERSION_STRING, "\0" 279.align 4 280