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#define _START _start 14#define _FAULT _fault 15 16#define SAVE_ALL \ 17 move.w #0x2700,%sr; /* disable intrs */ \ 18 subl #60,%sp; /* space for 15 regs */ \ 19 moveml %d0-%d7/%a0-%a6,%sp@; 20 21#define RESTORE_ALL \ 22 moveml %sp@,%d0-%d7/%a0-%a6; \ 23 addl #60,%sp; /* space for 15 regs */ \ 24 rte; 25 26.text 27 28/* 29 * Vector table. This is used for initial platform startup. 30 * These vectors are to catch any un-intended traps. 31 */ 32_vectors: 33INITSP: .long 0x00000000 /* Initial SP */ 34INITPC: .long _START /* Initial PC */ 35 36vector02_0F: 37.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 38.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 39 40/* Reserved */ 41vector10_17: 42.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 43 44vector18_1F: 45.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 46 47/* TRAP #0 - #15 */ 48vector20_2F: 49.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 51 52/* Reserved */ 53vector30_3F: 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 56 57vector64_127: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 66 67vector128_191: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 76 77vector192_255: 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 87.text 88 89.globl _start 90_start: 91 nop 92 nop 93 move.w #0x2700,%sr /* Mask off Interrupt */ 94 95 /* Set vector base register at the beginning of the Flash */ 96 move.l #CONFIG_SYS_FLASH_BASE, %d0 97 movec %d0, %VBR 98 99 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 100 movec %d0, %RAMBAR1 101 102 /* invalidate and disable cache */ 103 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ 104 movec %d0, %CACR /* Invalidate cache */ 105 nop 106 move.l #0, %d0 107 movec %d0, %ACR0 108 movec %d0, %ACR1 109 110 /* initialize general use internal ram */ 111 move.l #0, %d0 112 move.l #(ICACHE_STATUS), %a1 /* icache */ 113 move.l #(DCACHE_STATUS), %a2 /* icache */ 114 move.l %d0, (%a1) 115 move.l %d0, (%a2) 116 117 /* put relocation table address to a5 */ 118 move.l #__got_start, %a5 119 120 /* setup stack initially on top of internal static ram */ 121 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 122 123 /* 124 * if configured, malloc_f arena will be reserved first, 125 * then (and always) gd struct space will be reserved 126 */ 127 move.l %sp, -(%sp) 128 move.l #board_init_f_alloc_reserve, %a1 129 jsr (%a1) 130 131 /* update stack and frame-pointers */ 132 move.l %d0, %sp 133 move.l %sp, %fp 134 135 /* initialize reserved area */ 136 move.l %d0, -(%sp) 137 move.l #board_init_f_init_reserve, %a1 138 jsr (%a1) 139 140 /* run low-level CPU init code (from flash) */ 141 move.l #cpu_init_f, %a1 142 jsr (%a1) 143 144 /* run low-level board init code (from flash) */ 145 clr.l %sp@- 146 move.l #board_init_f, %a1 147 jsr (%a1) 148 149 /* board_init_f() does not return */ 150 151/******************************************************************************/ 152 153/* 154 * void relocate_code (addr_sp, gd, addr_moni) 155 * 156 * This "function" does not return, instead it continues in RAM 157 * after relocating the monitor code. 158 * 159 * r3 = dest 160 * r4 = src 161 * r5 = length in bytes 162 * r6 = cachelinesize 163 */ 164.globl relocate_code 165relocate_code: 166 link.w %a6,#0 167 move.l 8(%a6), %sp /* set new stack pointer */ 168 169 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 170 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 171 172 move.l #CONFIG_SYS_MONITOR_BASE, %a1 173 move.l #__init_end, %a2 174 move.l %a0, %a3 175 176 /* copy the code to RAM */ 1771: 178 move.l (%a1)+, (%a3)+ 179 cmp.l %a1,%a2 180 bgt.s 1b 181 182/* 183 * We are done. Do not return, instead branch to second part of board 184 * initialization, now running from RAM. 185 */ 186 move.l %a0, %a1 187 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 188 jmp (%a1) 189 190in_ram: 191 192clear_bss: 193 /* 194 * Now clear BSS segment 195 */ 196 move.l %a0, %a1 197 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 198 move.l %a0, %d1 199 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2006: 201 clr.l (%a1)+ 202 cmp.l %a1,%d1 203 bgt.s 6b 204 205 /* 206 * fix got table in RAM 207 */ 208 move.l %a0, %a1 209 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 210 move.l %a1,%a5 /* * fix got pointer register a5 */ 211 212 move.l %a0, %a2 213 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 214 2157: 216 move.l (%a1),%d1 217 sub.l #_start,%d1 218 add.l %a0,%d1 219 move.l %d1,(%a1)+ 220 cmp.l %a2, %a1 221 bne 7b 222 223 /* calculate relative jump to board_init_r in ram */ 224 move.l %a0, %a1 225 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 226 227 /* set parameters for board_init_r */ 228 move.l %a0,-(%sp) /* dest_addr */ 229 move.l %d0,-(%sp) /* gd */ 230 jsr (%a1) 231 232/******************************************************************************/ 233 234/* exception code */ 235.globl _fault 236_fault: 237 bra _fault 238 239.globl _exc_handler 240_exc_handler: 241 SAVE_ALL 242 movel %sp,%sp@- 243 bsr exc_handler 244 addql #4,%sp 245 RESTORE_ALL 246 247.globl _int_handler 248_int_handler: 249 SAVE_ALL 250 movel %sp,%sp@- 251 bsr int_handler 252 addql #4,%sp 253 RESTORE_ALL 254 255/******************************************************************************/ 256 257.globl version_string 258version_string: 259.ascii U_BOOT_VERSION_STRING, "\0" 260.align 4 261