1/* 2 * (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it> 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 21.macro SAVE_ALL 22 move.w #0x2700,%sr; /* disable intrs */ 23 subl #60,%sp; /* space for 15 regs */ 24 moveml %d0-%d7/%a0-%a6,%sp@ 25.endm 26 27.macro RESTORE_ALL 28 moveml %sp@,%d0-%d7/%a0-%a6; 29 addl #60,%sp; /* space for 15 regs */ 30 rte 31.endm 32 33/* If we come from a pre-loader we don't need an initial exception 34 * table. 35 */ 36#if !defined(CONFIG_MONITOR_IS_IN_RAM) 37 38.text 39 40/* 41 * Vector table. This is used for initial platform startup. 42 * These vectors are to catch any un-intended traps. 43 */ 44_vectors: 45/* Flash offset is 0 until we setup CS0 */ 46.long 0x00000000 47#if defined(CONFIG_M5307) && \ 48 (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 49.long _start - CONFIG_SYS_TEXT_BASE 50#else 51.long _START 52#endif 53 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 56.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 62 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 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.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 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.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 90#endif 91 92.text 93 94.globl _start 95_start: 96 nop 97 nop 98 move.w #0x2700,%sr 99 100 /* set MBAR address + valid flag */ 101 move.l #(CONFIG_SYS_MBAR + 1), %d0 102 move.c %d0, %MBAR 103 104 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 105 move.c %d0, %RAMBAR 106 107 /* DS 4.8.2 (Cache Organization) invalidate and disable cache */ 108 move.l #CF_CACR_CINVA, %d0 109 movec %d0, %CACR 110 move.l #0, %d0 111 movec %d0, %ACR0 112 movec %d0, %ACR1 113 114 /* 115 * if we come from a pre-loader we have no exception table and 116 * therefore no VBR to set 117 */ 118#if !defined(CONFIG_MONITOR_IS_IN_RAM) 119 move.l #CONFIG_SYS_FLASH_BASE, %d0 120 movec %d0, %VBR 121#endif 122 123 /* initialize general use internal ram */ 124 move.l #0, %d0 125 move.l #(ICACHE_STATUS), %a1 /* icache */ 126 move.l #(DCACHE_STATUS), %a2 /* dcache */ 127 move.l %d0, (%a1) 128 move.l %d0, (%a2) 129 130 /* put relocation table address to a5 */ 131 move.l #__got_start, %a5 132 133 /* setup stack initially on top of internal static ram */ 134 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 135 136 /* 137 * if configured, malloc_f arena will be reserved first, 138 * then (and always) gd struct space will be reserved 139 */ 140 move.l %sp, -(%sp) 141 bsr board_init_f_alloc_reserve 142 143 /* update stack and frame-pointers */ 144 move.l %d0, %sp 145 move.l %sp, %fp 146 147 /* initialize reserved area */ 148 move.l %d0, -(%sp) 149 bsr board_init_f_init_reserve 150 151 /* run low-level CPU init code (from flash) */ 152 bsr cpu_init_f 153 154 /* run low-level board init code (from flash) */ 155 clr.l %sp@- 156 bsr board_init_f 157 158 /* board_init_f() does not return */ 159 160/******************************************************************************/ 161 162/* 163 * void relocate_code (addr_sp, gd, addr_moni) 164 * 165 * This "function" does not return, instead it continues in RAM 166 * after relocating the monitor code. 167 * 168 */ 169.globl relocate_code 170relocate_code: 171 link.w %a6,#0 172 move.l 8(%a6), %sp /* set new stack pointer */ 173 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 174 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 175 176 move.l #CONFIG_SYS_MONITOR_BASE, %a1 177 move.l #__init_end, %a2 178 move.l %a0, %a3 179 /* copy the code to RAM */ 1801: 181 move.l (%a1)+, (%a3)+ 182 cmp.l %a1,%a2 183 bgt.s 1b 184 185/* 186 * We are done. Do not return, instead branch to second part of board 187 * initialization, now running from RAM. 188 */ 189 move.l %a0, %a1 190 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 191 jmp (%a1) 192 193in_ram: 194 195clear_bss: 196 /* 197 * Now clear BSS segment 198 */ 199 move.l %a0, %a1 200 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1 201 move.l %a0, %d1 202 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1 2036: 204 clr.l (%a1)+ 205 cmp.l %a1,%d1 206 bgt.s 6b 207 208 /* 209 * fix got table in RAM 210 */ 211 move.l %a0, %a1 212 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1 213 214 /* fix got pointer register a5 */ 215 move.l %a1,%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#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \ 236 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) 237 halt 238#endif 239 jsr (%a1) 240 241/******************************************************************************/ 242 243/* exception code */ 244.globl _fault 245_fault: 246 bra _fault 247 248.globl _exc_handler 249_exc_handler: 250 SAVE_ALL 251 movel %sp,%sp@- 252 bsr exc_handler 253 addql #4,%sp 254 RESTORE_ALL 255 256.globl _int_handler 257_int_handler: 258 SAVE_ALL 259 movel %sp,%sp@- 260 bsr int_handler 261 addql #4,%sp 262 RESTORE_ALL 263 264/******************************************************************************/ 265 266.globl version_string 267version_string: 268.ascii U_BOOT_VERSION 269.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" 270.ascii CONFIG_IDENT_STRING, "\0" 271.align 4 272