1/* 2 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 3 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> 4 * 5 * (C) Copyright 2004-2008 Freescale Semiconductor, Inc. 6 * TsiChung Liew (Tsi-Chung.Liew@freescale.com) 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11#include <asm-offsets.h> 12#include <config.h> 13#include "version.h" 14#include <asm/cache.h> 15 16#define _START _start 17#define _FAULT _fault 18 19#define SAVE_ALL \ 20 move.w #0x2700,%sr; /* disable intrs */ \ 21 subl #60,%sp; /* space for 15 regs */ \ 22 moveml %d0-%d7/%a0-%a6,%sp@; 23 24#define RESTORE_ALL \ 25 moveml %sp@,%d0-%d7/%a0-%a6; \ 26 addl #60,%sp; /* space for 15 regs */ \ 27 rte; 28 29#if !defined(CONFIG_MONITOR_IS_IN_RAM) 30 31.text 32 33/* 34 * Vector table. This is used for initial platform startup. 35 * These vectors are to catch any un-intended traps. 36 */ 37_vectors: 38INITSP: .long 0x00000000 /* Initial SP */ 39INITPC: .long _START /* Initial PC */ 40 41vector02_0F: 42.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 43.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 44 45/* Reserved */ 46vector10_17: 47.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 48 49vector18_1F: 50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 51 52/* TRAP #0 - #15 */ 53vector20_2F: 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 56 57/* Reserved */ 58vector30_3F: 59.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 60.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 61 62vector64_127: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 71 72vector128_191: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 81 82vector192_255: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 91#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */ 92 93.text 94 95.globl _start 96_start: 97 nop 98 nop 99 move.w #0x2700,%sr /* Mask off Interrupt */ 100 101#if !defined(CONFIG_MONITOR_IS_IN_RAM) 102 /* Set vector base register at the beginning of the Flash */ 103 move.l #CONFIG_SYS_FLASH_BASE, %d0 104 movec %d0, %VBR 105#endif 106 107 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 108 movec %d0, %RAMBAR1 109 110 /* invalidate and disable cache */ 111 move.l #CF_CACR_CINVA, %d0 /* Invalidate cache cmd */ 112 movec %d0, %CACR /* Invalidate cache */ 113 move.l #0, %d0 114 movec %d0, %ACR0 115 movec %d0, %ACR1 116 117#ifdef CONFIG_MCF5301x 118 move.l #(0xFC0a0010), %a0 119 move.w (%a0), %d0 120 and.l %d0, 0xEFFF 121 122 move.w %d0, (%a0) 123#endif 124 125 /* initialize general use internal ram */ 126 move.l #0, %d0 127 move.l #(ICACHE_STATUS), %a1 /* icache */ 128 move.l #(DCACHE_STATUS), %a2 /* icache */ 129 move.l %d0, (%a1) 130 move.l %d0, (%a2) 131 132 /* put relocation table address to a5 */ 133 move.l #__got_start, %a5 134 135 /* setup stack initially on top of internal static ram */ 136 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 137 138 /* 139 * if configured, malloc_f arena will be reserved first, 140 * then (and always) gd struct space will be reserved 141 */ 142 move.l %sp, -(%sp) 143 move.l #board_init_f_alloc_reserve, %a1 144 jsr (%a1) 145 146 /* update stack and frame-pointers */ 147 move.l %d0, %sp 148 move.l %sp, %fp 149 150 /* initialize reserved area */ 151 move.l %d0, -(%sp) 152 move.l #board_init_f_init_reserve, %a1 153 jsr (%a1) 154 155 /* run low-level CPU init code (from flash) */ 156 move.l #cpu_init_f, %a1 157 jsr (%a1) 158 159 /* run low-level board init code (from flash) */ 160 clr.l %sp@- 161 move.l #board_init_f, %a1 162 jsr (%a1) 163 164 /* board_init_f() does not return */ 165 166/******************************************************************************/ 167 168/* 169 * void relocate_code (addr_sp, gd, addr_moni) 170 * 171 * This "function" does not return, instead it continues in RAM 172 * after relocating the monitor code. 173 * 174 * r3 = dest 175 * r4 = src 176 * r5 = length in bytes 177 * r6 = cachelinesize 178 */ 179.globl relocate_code 180relocate_code: 181 link.w %a6,#0 182 move.l 8(%a6), %sp /* set new stack pointer */ 183 184 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 185 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 186 187 move.l #CONFIG_SYS_MONITOR_BASE, %a1 188 move.l #__init_end, %a2 189 move.l %a0, %a3 190 191 /* copy the code to RAM */ 1921: 193 move.l (%a1)+, (%a3)+ 194 cmp.l %a1,%a2 195 bgt.s 1b 196 197/* 198 * We are done. Do not return, instead branch to second part of board 199 * initialization, now running from RAM. 200 */ 201 move.l %a0, %a1 202 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 203 jmp (%a1) 204 205in_ram: 206 207clear_bss: 208 /* 209 * Now clear BSS segment 210 */ 211 move.l %a0, %a1 212 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1 213 move.l %a0, %d1 214 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1 2156: 216 clr.l (%a1)+ 217 cmp.l %a1,%d1 218 bgt.s 6b 219 220 /* 221 * fix got table in RAM 222 */ 223 move.l %a0, %a1 224 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 225 move.l %a1,%a5 /* fix got pointer register a5 */ 226 227 move.l %a0, %a2 228 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 229 2307: 231 move.l (%a1),%d1 232 sub.l #_start,%d1 233 add.l %a0,%d1 234 move.l %d1,(%a1)+ 235 cmp.l %a2, %a1 236 bne 7b 237 238 /* calculate relative jump to board_init_r in ram */ 239 move.l %a0, %a1 240 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 241 242 /* set parameters for board_init_r */ 243 move.l %a0,-(%sp) /* dest_addr */ 244 move.l %d0,-(%sp) /* gd */ 245 jsr (%a1) 246 247/******************************************************************************/ 248 249/* exception code */ 250.globl _fault 251_fault: 252 bra _fault 253 254.globl _exc_handler 255_exc_handler: 256 SAVE_ALL 257 movel %sp,%sp@- 258 bsr exc_handler 259 addql #4,%sp 260 RESTORE_ALL 261 262.globl _int_handler 263_int_handler: 264 SAVE_ALL 265 movel %sp,%sp@- 266 bsr int_handler 267 addql #4,%sp 268 RESTORE_ALL 269 270/******************************************************************************/ 271 272.globl version_string 273version_string: 274.ascii U_BOOT_VERSION_STRING, "\0" 275.align 4 276