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#ifndef CONFIG_IDENT_STRING 14#define CONFIG_IDENT_STRING "" 15#endif 16 17#define _START _start 18#define _FAULT _fault 19 20#define SAVE_ALL \ 21 move.w #0x2700,%sr; /* disable intrs */ \ 22 subl #60,%sp; /* space for 15 regs */ \ 23 moveml %d0-%d7/%a0-%a6,%sp@; 24 25#define RESTORE_ALL \ 26 moveml %sp@,%d0-%d7/%a0-%a6; \ 27 addl #60,%sp; /* space for 15 regs */ \ 28 rte; 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 91.text 92 93.globl _start 94_start: 95 nop 96 nop 97 move.w #0x2700,%sr /* Mask off Interrupt */ 98 99 /* Set vector base register at the beginning of the Flash */ 100 move.l #CONFIG_SYS_FLASH_BASE, %d0 101 movec %d0, %VBR 102 103 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 104 movec %d0, %RAMBAR0 105 106 move.l #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0 107 movec %d0, %RAMBAR1 108 109 move.l #CONFIG_SYS_MBAR, %d0 /* set MBAR address */ 110 move.c %d0, %MBAR 111 112 /* invalidate and disable cache */ 113 move.l #0x01040100, %d0 /* Invalidate cache cmd */ 114 movec %d0, %CACR /* Invalidate cache */ 115 move.l #0, %d0 116 movec %d0, %ACR0 117 movec %d0, %ACR1 118 movec %d0, %ACR2 119 movec %d0, %ACR3 120 121 /* initialize general use internal ram */ 122 move.l #0, %d0 123 move.l #(ICACHE_STATUS), %a1 /* icache */ 124 move.l #(DCACHE_STATUS), %a2 /* icache */ 125 move.l %d0, (%a1) 126 move.l %d0, (%a2) 127 128 /* put relocation table address to a5 */ 129 move.l #__got_start, %a5 130 131 /* setup stack initially on top of internal static ram */ 132 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 133 134 /* 135 * if configured, malloc_f arena will be reserved first, 136 * then (and always) gd struct space will be reserved 137 */ 138 move.l %sp, -(%sp) 139 bsr board_init_f_alloc_reserve 140 141 /* update stack and frame-pointers */ 142 move.l %d0, %sp 143 move.l %sp, %fp 144 145 /* initialize reserved area */ 146 move.l %d0, -(%sp) 147 bsr board_init_f_init_reserve 148 149 /* run low-level CPU init code (from flash) */ 150 jbsr cpu_init_f 151 152 /* run low-level board init code (from flash) */ 153 clr.l %sp@- 154 jbsr board_init_f 155 156 /* board_init_f() does not return */ 157 158/******************************************************************************/ 159 160/* 161 * void relocate_code (addr_sp, gd, addr_moni) 162 * 163 * This "function" does not return, instead it continues in RAM 164 * after relocating the monitor code. 165 * 166 * r3 = dest 167 * r4 = src 168 * r5 = length in bytes 169 * r6 = cachelinesize 170 */ 171.globl relocate_code 172relocate_code: 173 link.w %a6,#0 174 move.l 8(%a6), %sp /* set new stack pointer */ 175 176 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 177 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 178 179 move.l #CONFIG_SYS_MONITOR_BASE, %a1 180 move.l #__init_end, %a2 181 move.l %a0, %a3 182 183 /* copy the code to RAM */ 1841: 185 move.l (%a1)+, (%a3)+ 186 cmp.l %a1,%a2 187 bgt.s 1b 188 189/* 190 * We are done. Do not return, instead branch to second part of board 191 * initialization, now running from RAM. 192 */ 193 move.l %a0, %a1 194 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 195 jmp (%a1) 196 197in_ram: 198 199clear_bss: 200 /* 201 * Now clear BSS segment 202 */ 203 move.l %a0, %a1 204 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 205 move.l %a0, %d1 206 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2076: 208 clr.l (%a1)+ 209 cmp.l %a1,%d1 210 bgt.s 6b 211 212 /* 213 * fix got table in RAM 214 */ 215 move.l %a0, %a1 216 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 217 move.l %a1,%a5 /* fix got pointer register a5 */ 218 219 move.l %a0, %a2 220 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 221 2227: 223 move.l (%a1),%d1 224 sub.l #_start,%d1 225 add.l %a0,%d1 226 move.l %d1,(%a1)+ 227 cmp.l %a2, %a1 228 bne 7b 229 230 /* calculate relative jump to board_init_r in ram */ 231 move.l %a0, %a1 232 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 233 234 /* set parameters for board_init_r */ 235 move.l %a0,-(%sp) /* dest_addr */ 236 move.l %d0,-(%sp) /* gd */ 237 jsr (%a1) 238 239/******************************************************************************/ 240 241/* exception code */ 242.globl _fault 243_fault: 244 bra _fault 245 246.globl _exc_handler 247_exc_handler: 248 SAVE_ALL 249 movel %sp,%sp@- 250 bsr exc_handler 251 addql #4,%sp 252 RESTORE_ALL 253 254.globl _int_handler 255_int_handler: 256 SAVE_ALL 257 movel %sp,%sp@- 258 bsr int_handler 259 addql #4,%sp 260 RESTORE_ALL 261 262/******************************************************************************/ 263 264.globl version_string 265version_string: 266.ascii U_BOOT_VERSION_STRING, "\0" 267.align 4 268