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 7#include <asm-offsets.h> 8#include <config.h> 9#include "version.h" 10#include <asm/cache.h> 11 12#define _START _start 13#define _FAULT _fault 14 15#define SAVE_ALL \ 16 move.w #0x2700,%sr; /* disable intrs */ \ 17 subl #60,%sp; /* space for 15 regs */ \ 18 moveml %d0-%d7/%a0-%a6,%sp@; 19 20#define RESTORE_ALL \ 21 moveml %sp@,%d0-%d7/%a0-%a6; \ 22 addl #60,%sp; /* space for 15 regs */ \ 23 rte; 24 25.text 26 27/* 28 * Vector table. This is used for initial platform startup. 29 * These vectors are to catch any un-intended traps. 30 */ 31_vectors: 32INITSP: .long 0x00000000 /* Initial SP */ 33INITPC: .long _START /* Initial PC */ 34 35vector02_0F: 36.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 37.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 38 39/* Reserved */ 40vector10_17: 41.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 42 43vector18_1F: 44.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 45 46/* TRAP #0 - #15 */ 47vector20_2F: 48.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 49.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 50 51/* Reserved */ 52vector30_3F: 53.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55 56vector64_127: 57.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 58.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 59.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 60.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 61.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 66vector128_191: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 71.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 76vector192_255: 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.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 86.text 87 88.globl _start 89_start: 90 nop 91 nop 92 move.w #0x2700,%sr /* Mask off Interrupt */ 93 94 /* Set vector base register at the beginning of the Flash */ 95 move.l #CONFIG_SYS_FLASH_BASE, %d0 96 movec %d0, %VBR 97 98 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 99 movec %d0, %RAMBAR1 100 101 /* invalidate and disable cache */ 102 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ 103 movec %d0, %CACR /* Invalidate cache */ 104 nop 105 move.l #0, %d0 106 movec %d0, %ACR0 107 movec %d0, %ACR1 108 109 /* initialize general use internal ram */ 110 move.l #0, %d0 111 move.l #(ICACHE_STATUS), %a1 /* icache */ 112 move.l #(DCACHE_STATUS), %a2 /* icache */ 113 move.l %d0, (%a1) 114 move.l %d0, (%a2) 115 116 /* put relocation table address to a5 */ 117 move.l #__got_start, %a5 118 119 /* setup stack initially on top of internal static ram */ 120 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 121 122 /* 123 * if configured, malloc_f arena will be reserved first, 124 * then (and always) gd struct space will be reserved 125 */ 126 move.l %sp, -(%sp) 127 move.l #board_init_f_alloc_reserve, %a1 128 jsr (%a1) 129 130 /* update stack and frame-pointers */ 131 move.l %d0, %sp 132 move.l %sp, %fp 133 134 /* initialize reserved area */ 135 move.l %d0, -(%sp) 136 move.l #board_init_f_init_reserve, %a1 137 jsr (%a1) 138 139 /* run low-level CPU init code (from flash) */ 140 move.l #cpu_init_f, %a1 141 jsr (%a1) 142 143 /* run low-level board init code (from flash) */ 144 clr.l %sp@- 145 move.l #board_init_f, %a1 146 jsr (%a1) 147 148 /* board_init_f() does not return */ 149 150/******************************************************************************/ 151 152/* 153 * void relocate_code (addr_sp, gd, addr_moni) 154 * 155 * This "function" does not return, instead it continues in RAM 156 * after relocating the monitor code. 157 * 158 * r3 = dest 159 * r4 = src 160 * r5 = length in bytes 161 * r6 = cachelinesize 162 */ 163.globl relocate_code 164relocate_code: 165 link.w %a6,#0 166 move.l 8(%a6), %sp /* set new stack pointer */ 167 168 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 169 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 170 171 move.l #CONFIG_SYS_MONITOR_BASE, %a1 172 move.l #__init_end, %a2 173 move.l %a0, %a3 174 175 /* copy the code to RAM */ 1761: 177 move.l (%a1)+, (%a3)+ 178 cmp.l %a1,%a2 179 bgt.s 1b 180 181/* 182 * We are done. Do not return, instead branch to second part of board 183 * initialization, now running from RAM. 184 */ 185 move.l %a0, %a1 186 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 187 jmp (%a1) 188 189in_ram: 190 191clear_bss: 192 /* 193 * Now clear BSS segment 194 */ 195 move.l %a0, %a1 196 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 197 move.l %a0, %d1 198 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 1996: 200 clr.l (%a1)+ 201 cmp.l %a1,%d1 202 bgt.s 6b 203 204 /* 205 * fix got table in RAM 206 */ 207 move.l %a0, %a1 208 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 209 move.l %a1,%a5 /* * fix got pointer register a5 */ 210 211 move.l %a0, %a2 212 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 213 2147: 215 move.l (%a1),%d1 216 sub.l #_start,%d1 217 add.l %a0,%d1 218 move.l %d1,(%a1)+ 219 cmp.l %a2, %a1 220 bne 7b 221 222 /* calculate relative jump to board_init_r in ram */ 223 move.l %a0, %a1 224 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 225 226 /* set parameters for board_init_r */ 227 move.l %a0,-(%sp) /* dest_addr */ 228 move.l %d0,-(%sp) /* gd */ 229 jsr (%a1) 230 231/******************************************************************************/ 232 233/* exception code */ 234.globl _fault 235_fault: 236 bra _fault 237 238.globl _exc_handler 239_exc_handler: 240 SAVE_ALL 241 movel %sp,%sp@- 242 bsr exc_handler 243 addql #4,%sp 244 RESTORE_ALL 245 246.globl _int_handler 247_int_handler: 248 SAVE_ALL 249 movel %sp,%sp@- 250 bsr int_handler 251 addql #4,%sp 252 RESTORE_ALL 253 254/******************************************************************************/ 255 256.globl version_string 257version_string: 258.ascii U_BOOT_VERSION_STRING, "\0" 259.align 4 260