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, %RAMBAR0 121 122 move.l #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0 123 movec %d0, %RAMBAR1 124 125 move.l #CONFIG_SYS_MBAR, %d0 /* set MBAR address */ 126 move.c %d0, %MBAR 127 128 /* invalidate and disable cache */ 129 move.l #0x01040100, %d0 /* Invalidate cache cmd */ 130 movec %d0, %CACR /* Invalidate cache */ 131 move.l #0, %d0 132 movec %d0, %ACR0 133 movec %d0, %ACR1 134 movec %d0, %ACR2 135 movec %d0, %ACR3 136 137 /* initialize general use internal ram */ 138 move.l #0, %d0 139 move.l #(ICACHE_STATUS), %a1 /* icache */ 140 move.l #(DCACHE_STATUS), %a2 /* icache */ 141 move.l %d0, (%a1) 142 move.l %d0, (%a2) 143 144 /* set stackpointer to end of internal ram to get some stackspace for the 145 first c-code */ 146 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 147 clr.l %sp@- 148 149 move.l #__got_start, %a5 /* put relocation table address to a5 */ 150 151 jbsr cpu_init_f /* run low-level CPU init code (from flash) */ 152 jbsr board_init_f /* run low-level board init code (from flash) */ 153 154 /* board_init_f() does not return */ 155 156/*------------------------------------------------------------------------------*/ 157 158/* 159 * void relocate_code (addr_sp, gd, addr_moni) 160 * 161 * This "function" does not return, instead it continues in RAM 162 * after relocating the monitor code. 163 * 164 * r3 = dest 165 * r4 = src 166 * r5 = length in bytes 167 * r6 = cachelinesize 168 */ 169 .globl relocate_code 170relocate_code: 171 link.w %a6,#0 172 move.l 8(%a6), %sp /* set new stack pointer */ 173 174 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 175 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 176 177 move.l #CONFIG_SYS_MONITOR_BASE, %a1 178 move.l #__init_end, %a2 179 move.l %a0, %a3 180 181 /* copy the code to RAM */ 1821: 183 move.l (%a1)+, (%a3)+ 184 cmp.l %a1,%a2 185 bgt.s 1b 186 187/* 188 * We are done. Do not return, instead branch to second part of board 189 * initialization, now running from RAM. 190 */ 191 move.l %a0, %a1 192 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 193 jmp (%a1) 194 195in_ram: 196 197clear_bss: 198 /* 199 * Now clear BSS segment 200 */ 201 move.l %a0, %a1 202 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 203 move.l %a0, %d1 204 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2056: 206 clr.l (%a1)+ 207 cmp.l %a1,%d1 208 bgt.s 6b 209 210 /* 211 * fix got table in RAM 212 */ 213 move.l %a0, %a1 214 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 215 move.l %a1,%a5 /* * fix got pointer register a5 */ 216 217 move.l %a0, %a2 218 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 219 2207: 221 move.l (%a1),%d1 222 sub.l #_start,%d1 223 add.l %a0,%d1 224 move.l %d1,(%a1)+ 225 cmp.l %a2, %a1 226 bne 7b 227 228 /* calculate relative jump to board_init_r in ram */ 229 move.l %a0, %a1 230 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 231 232 /* set parameters for board_init_r */ 233 move.l %a0,-(%sp) /* dest_addr */ 234 move.l %d0,-(%sp) /* gd */ 235 jsr (%a1) 236 237/*------------------------------------------------------------------------------*/ 238/* exception code */ 239 .globl _fault 240_fault: 241 bra _fault 242 .globl _exc_handler 243 244_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