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 * Vector table. This is used for initial platform startup. 33 * These vectors are to catch any un-intended traps. 34 */ 35_vectors: 36 37INITSP: .long 0x00000000 /* Initial SP */ 38INITPC: .long _START /* Initial PC */ 39vector02: .long _FAULT /* Access Error */ 40vector03: .long _FAULT /* Address Error */ 41vector04: .long _FAULT /* Illegal Instruction */ 42vector05: .long _FAULT /* Reserved */ 43vector06: .long _FAULT /* Reserved */ 44vector07: .long _FAULT /* Reserved */ 45vector08: .long _FAULT /* Privilege Violation */ 46vector09: .long _FAULT /* Trace */ 47vector0A: .long _FAULT /* Unimplemented A-Line */ 48vector0B: .long _FAULT /* Unimplemented F-Line */ 49vector0C: .long _FAULT /* Debug Interrupt */ 50vector0D: .long _FAULT /* Reserved */ 51vector0E: .long _FAULT /* Format Error */ 52vector0F: .long _FAULT /* Unitialized Int. */ 53 54/* Reserved */ 55vector10_17: 56.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 57 58vector18: .long _FAULT /* Spurious Interrupt */ 59vector19: .long _FAULT /* Autovector Level 1 */ 60vector1A: .long _FAULT /* Autovector Level 2 */ 61vector1B: .long _FAULT /* Autovector Level 3 */ 62vector1C: .long _FAULT /* Autovector Level 4 */ 63vector1D: .long _FAULT /* Autovector Level 5 */ 64vector1E: .long _FAULT /* Autovector Level 6 */ 65vector1F: .long _FAULT /* Autovector Level 7 */ 66 67/* TRAP #0 - #15 */ 68vector20_2F: 69.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 70.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 71 72/* Reserved */ 73vector30_3F: 74.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 75.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 76 77vector64_127: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 86 87vector128_191: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 96 97vector192_255: 98.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 99.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 100.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 101.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 106 107 .text 108 109 .globl _start 110_start: 111 nop 112 nop 113 move.w #0x2700,%sr /* Mask off Interrupt */ 114 115 /* Set vector base register at the beginning of the Flash */ 116 move.l #CONFIG_SYS_FLASH_BASE, %d0 117 movec %d0, %VBR 118 119 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 120 movec %d0, %RAMBAR1 121 122 /* invalidate and disable cache */ 123 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ 124 movec %d0, %CACR /* Invalidate cache */ 125 nop 126 move.l #0, %d0 127 movec %d0, %ACR0 128 movec %d0, %ACR1 129 130 /* initialize general use internal ram */ 131 move.l #0, %d0 132 move.l #(ICACHE_STATUS), %a1 /* icache */ 133 move.l #(DCACHE_STATUS), %a2 /* icache */ 134 move.l %d0, (%a1) 135 move.l %d0, (%a2) 136 137 /* set stackpointer to end of internal ram to get some stackspace for the 138 first c-code */ 139 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 140 clr.l %sp@- 141 142 move.l #__got_start, %a5 /* put relocation table address to a5 */ 143 144 /* run low-level CPU init code (from flash) */ 145 move.l #cpu_init_f, %a1 146 jsr (%a1) 147 /* run low-level board init code (from flash) */ 148 move.l #board_init_f, %a1 149 jsr (%a1) 150 151 /* board_init_f() does not return */ 152 153/*------------------------------------------------------------------------------*/ 154 155/* 156 * void relocate_code (addr_sp, gd, addr_moni) 157 * 158 * This "function" does not return, instead it continues in RAM 159 * after relocating the monitor code. 160 * 161 * r3 = dest 162 * r4 = src 163 * r5 = length in bytes 164 * r6 = cachelinesize 165 */ 166 .globl relocate_code 167relocate_code: 168 link.w %a6,#0 169 move.l 8(%a6), %sp /* set new stack pointer */ 170 171 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 172 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 173 174 move.l #CONFIG_SYS_MONITOR_BASE, %a1 175 move.l #__init_end, %a2 176 move.l %a0, %a3 177 178 /* copy the code to RAM */ 1791: 180 move.l (%a1)+, (%a3)+ 181 cmp.l %a1,%a2 182 bgt.s 1b 183 184/* 185 * We are done. Do not return, instead branch to second part of board 186 * initialization, now running from RAM. 187 */ 188 move.l %a0, %a1 189 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 190 jmp (%a1) 191 192in_ram: 193 194clear_bss: 195 /* 196 * Now clear BSS segment 197 */ 198 move.l %a0, %a1 199 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 200 move.l %a0, %d1 201 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2026: 203 clr.l (%a1)+ 204 cmp.l %a1,%d1 205 bgt.s 6b 206 207 /* 208 * fix got table in RAM 209 */ 210 move.l %a0, %a1 211 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 212 move.l %a1,%a5 /* * fix got pointer register a5 */ 213 214 move.l %a0, %a2 215 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 216 2177: 218 move.l (%a1),%d1 219 sub.l #_start,%d1 220 add.l %a0,%d1 221 move.l %d1,(%a1)+ 222 cmp.l %a2, %a1 223 bne 7b 224 225 /* calculate relative jump to board_init_r in ram */ 226 move.l %a0, %a1 227 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 228 229 /* set parameters for board_init_r */ 230 move.l %a0,-(%sp) /* dest_addr */ 231 move.l %d0,-(%sp) /* gd */ 232 jsr (%a1) 233 234/*------------------------------------------------------------------------------*/ 235/* exception code */ 236 .globl _fault 237_fault: 238 bra _fault 239 .globl _exc_handler 240 241_exc_handler: 242 SAVE_ALL 243 movel %sp,%sp@- 244 bsr exc_handler 245 addql #4,%sp 246 RESTORE_ALL 247 248 .globl _int_handler 249_int_handler: 250 SAVE_ALL 251 movel %sp,%sp@- 252 bsr int_handler 253 addql #4,%sp 254 RESTORE_ALL 255 256/*------------------------------------------------------------------------------*/ 257 258 .globl version_string 259version_string: 260 .ascii U_BOOT_VERSION_STRING, "\0" 261 .align 4 262