1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 4 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> 5 * 6 * (C) Copyright 2004-2008 Freescale Semiconductor, Inc. 7 * TsiChung Liew (Tsi-Chung.Liew@freescale.com) 8 */ 9 10#include <asm-offsets.h> 11#include <config.h> 12#include "version.h" 13#include <asm/cache.h> 14 15#define _START _start 16#define _FAULT _fault 17 18#define SAVE_ALL \ 19 move.w #0x2700,%sr; /* disable intrs */ \ 20 subl #60,%sp; /* space for 15 regs */ \ 21 moveml %d0-%d7/%a0-%a6,%sp@; 22 23#define RESTORE_ALL \ 24 moveml %sp@,%d0-%d7/%a0-%a6; \ 25 addl #60,%sp; /* space for 15 regs */ \ 26 rte; 27 28#if !defined(CONFIG_MONITOR_IS_IN_RAM) 29 30.text 31 32/* 33 * Vector table. This is used for initial platform startup. 34 * These vectors are to catch any un-intended traps. 35 */ 36_vectors: 37INITSP: .long 0x00000000 /* Initial SP */ 38INITPC: .long _START /* Initial PC */ 39 40vector02_0F: 41.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 42.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 43 44/* Reserved */ 45vector10_17: 46.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 47 48vector18_1F: 49.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 50 51/* TRAP #0 - #15 */ 52vector20_2F: 53.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55 56/* Reserved */ 57vector30_3F: 58.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 59.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 60 61vector64_127: 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.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 71vector128_191: 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.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 81vector192_255: 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#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */ 91 92.text 93 94.globl _start 95_start: 96 nop 97 nop 98 move.w #0x2700,%sr /* Mask off Interrupt */ 99 100#if !defined(CONFIG_MONITOR_IS_IN_RAM) 101 /* Set vector base register at the beginning of the Flash */ 102 move.l #CONFIG_SYS_FLASH_BASE, %d0 103 movec %d0, %VBR 104#endif 105 106 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 107 movec %d0, %RAMBAR1 108 109 /* invalidate and disable cache */ 110 move.l #CF_CACR_CINVA, %d0 /* Invalidate cache cmd */ 111 movec %d0, %CACR /* Invalidate cache */ 112 move.l #0, %d0 113 movec %d0, %ACR0 114 movec %d0, %ACR1 115 116#ifdef CONFIG_MCF5301x 117 move.l #(0xFC0a0010), %a0 118 move.w (%a0), %d0 119 and.l %d0, 0xEFFF 120 121 move.w %d0, (%a0) 122#endif 123 124 /* initialize general use internal ram */ 125 move.l #0, %d0 126 move.l #(ICACHE_STATUS), %a1 /* icache */ 127 move.l #(DCACHE_STATUS), %a2 /* icache */ 128 move.l %d0, (%a1) 129 move.l %d0, (%a2) 130 131 /* put relocation table address to a5 */ 132 move.l #__got_start, %a5 133 134 /* setup stack initially on top of internal static ram */ 135 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 136 137 /* 138 * if configured, malloc_f arena will be reserved first, 139 * then (and always) gd struct space will be reserved 140 */ 141 move.l %sp, -(%sp) 142 move.l #board_init_f_alloc_reserve, %a1 143 jsr (%a1) 144 145 /* update stack and frame-pointers */ 146 move.l %d0, %sp 147 move.l %sp, %fp 148 149 /* initialize reserved area */ 150 move.l %d0, -(%sp) 151 move.l #board_init_f_init_reserve, %a1 152 jsr (%a1) 153 154 /* run low-level CPU init code (from flash) */ 155 move.l #cpu_init_f, %a1 156 jsr (%a1) 157 158 /* run low-level board init code (from flash) */ 159 clr.l %sp@- 160 move.l #board_init_f, %a1 161 jsr (%a1) 162 163 /* board_init_f() does not return */ 164 165/******************************************************************************/ 166 167/* 168 * void relocate_code (addr_sp, gd, addr_moni) 169 * 170 * This "function" does not return, instead it continues in RAM 171 * after relocating the monitor code. 172 * 173 * r3 = dest 174 * r4 = src 175 * r5 = length in bytes 176 * r6 = cachelinesize 177 */ 178.globl relocate_code 179relocate_code: 180 link.w %a6,#0 181 move.l 8(%a6), %sp /* set new stack pointer */ 182 183 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 184 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 185 186 move.l #CONFIG_SYS_MONITOR_BASE, %a1 187 move.l #__init_end, %a2 188 move.l %a0, %a3 189 190 /* copy the code to RAM */ 1911: 192 move.l (%a1)+, (%a3)+ 193 cmp.l %a1,%a2 194 bgt.s 1b 195 196/* 197 * We are done. Do not return, instead branch to second part of board 198 * initialization, now running from RAM. 199 */ 200 move.l %a0, %a1 201 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 202 jmp (%a1) 203 204in_ram: 205 206clear_bss: 207 /* 208 * Now clear BSS segment 209 */ 210 move.l %a0, %a1 211 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 212 move.l %a0, %d1 213 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2146: 215 clr.l (%a1)+ 216 cmp.l %a1,%d1 217 bgt.s 6b 218 219 /* 220 * fix got table in RAM 221 */ 222 move.l %a0, %a1 223 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 224 move.l %a1,%a5 /* fix got pointer register a5 */ 225 226 move.l %a0, %a2 227 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 228 2297: 230 move.l (%a1),%d1 231 sub.l #_start,%d1 232 add.l %a0,%d1 233 move.l %d1,(%a1)+ 234 cmp.l %a2, %a1 235 bne 7b 236 237 /* calculate relative jump to board_init_r in ram */ 238 move.l %a0, %a1 239 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 240 241 /* set parameters for board_init_r */ 242 move.l %a0,-(%sp) /* dest_addr */ 243 move.l %d0,-(%sp) /* gd */ 244 jsr (%a1) 245 246/******************************************************************************/ 247 248/* exception code */ 249.globl _fault 250_fault: 251 bra _fault 252 253.globl _exc_handler 254_exc_handler: 255 SAVE_ALL 256 movel %sp,%sp@- 257 bsr exc_handler 258 addql #4,%sp 259 RESTORE_ALL 260 261.globl _int_handler 262_int_handler: 263 SAVE_ALL 264 movel %sp,%sp@- 265 bsr int_handler 266 addql #4,%sp 267 RESTORE_ALL 268 269/******************************************************************************/ 270 271.globl version_string 272version_string: 273.ascii U_BOOT_VERSION_STRING, "\0" 274.align 4 275