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, %RAMBAR1 105 106 /* invalidate and disable cache */ 107 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ 108 movec %d0, %CACR /* Invalidate cache */ 109 nop 110 move.l #0, %d0 111 movec %d0, %ACR0 112 movec %d0, %ACR1 113 114 /* initialize general use internal ram */ 115 move.l #0, %d0 116 move.l #(ICACHE_STATUS), %a1 /* icache */ 117 move.l #(DCACHE_STATUS), %a2 /* icache */ 118 move.l %d0, (%a1) 119 move.l %d0, (%a2) 120 121 /* put relocation table address to a5 */ 122 move.l #__got_start, %a5 123 124 /* setup stack initially on top of internal static ram */ 125 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 126 127 /* 128 * if configured, malloc_f arena will be reserved first, 129 * then (and always) gd struct space will be reserved 130 */ 131 move.l %sp, -(%sp) 132 move.l #board_init_f_alloc_reserve, %a1 133 jsr (%a1) 134 135 /* update stack and frame-pointers */ 136 move.l %d0, %sp 137 move.l %sp, %fp 138 139 /* initialize reserved area */ 140 move.l %d0, -(%sp) 141 move.l #board_init_f_init_reserve, %a1 142 jsr (%a1) 143 144 /* run low-level CPU init code (from flash) */ 145 move.l #cpu_init_f, %a1 146 jsr (%a1) 147 148 /* run low-level board init code (from flash) */ 149 clr.l %sp@- 150 move.l #board_init_f, %a1 151 jsr (%a1) 152 153 /* board_init_f() does not return */ 154 155/******************************************************************************/ 156 157/* 158 * void relocate_code (addr_sp, gd, addr_moni) 159 * 160 * This "function" does not return, instead it continues in RAM 161 * after relocating the monitor code. 162 * 163 * r3 = dest 164 * r4 = src 165 * r5 = length in bytes 166 * r6 = cachelinesize 167 */ 168.globl relocate_code 169relocate_code: 170 link.w %a6,#0 171 move.l 8(%a6), %sp /* set new stack pointer */ 172 173 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 174 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 175 176 move.l #CONFIG_SYS_MONITOR_BASE, %a1 177 move.l #__init_end, %a2 178 move.l %a0, %a3 179 180 /* copy the code to RAM */ 1811: 182 move.l (%a1)+, (%a3)+ 183 cmp.l %a1,%a2 184 bgt.s 1b 185 186/* 187 * We are done. Do not return, instead branch to second part of board 188 * initialization, now running from RAM. 189 */ 190 move.l %a0, %a1 191 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 192 jmp (%a1) 193 194in_ram: 195 196clear_bss: 197 /* 198 * Now clear BSS segment 199 */ 200 move.l %a0, %a1 201 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 202 move.l %a0, %d1 203 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2046: 205 clr.l (%a1)+ 206 cmp.l %a1,%d1 207 bgt.s 6b 208 209 /* 210 * fix got table in RAM 211 */ 212 move.l %a0, %a1 213 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 214 move.l %a1,%a5 /* * fix got pointer register a5 */ 215 216 move.l %a0, %a2 217 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 218 2197: 220 move.l (%a1),%d1 221 sub.l #_start,%d1 222 add.l %a0,%d1 223 move.l %d1,(%a1)+ 224 cmp.l %a2, %a1 225 bne 7b 226 227 /* calculate relative jump to board_init_r in ram */ 228 move.l %a0, %a1 229 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 230 231 /* set parameters for board_init_r */ 232 move.l %a0,-(%sp) /* dest_addr */ 233 move.l %d0,-(%sp) /* gd */ 234 jsr (%a1) 235 236/******************************************************************************/ 237 238/* exception code */ 239.globl _fault 240_fault: 241 bra _fault 242 243.globl _exc_handler 244_exc_handler: 245 SAVE_ALL 246 movel %sp,%sp@- 247 bsr exc_handler 248 addql #4,%sp 249 RESTORE_ALL 250 251.globl _int_handler 252_int_handler: 253 SAVE_ALL 254 movel %sp,%sp@- 255 bsr int_handler 256 addql #4,%sp 257 RESTORE_ALL 258 259/******************************************************************************/ 260 261.globl version_string 262version_string: 263.ascii U_BOOT_VERSION_STRING, "\0" 264.align 4 265