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 * Vector table. This is used for initial platform startup. 41 * These vectors are to catch any un-intended traps. 42 */ 43_vectors: 44 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 .globl _start 94_start: 95 nop 96 nop 97 move.w #0x2700,%sr 98 99 /* set MBAR address + valid flag */ 100 move.l #(CONFIG_SYS_MBAR + 1), %d0 101 move.c %d0, %MBAR 102 103 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 104 move.c %d0, %RAMBAR 105 106 /* DS 4.8.2 (Cache Organization) invalidate and disable cache */ 107 move.l #CF_CACR_CINVA, %d0 108 movec %d0, %CACR 109 move.l #0, %d0 110 movec %d0, %ACR0 111 movec %d0, %ACR1 112 113 /* 114 * if we come from a pre-loader we have no exception table and 115 * therefore no VBR to set 116 */ 117#if !defined(CONFIG_MONITOR_IS_IN_RAM) 118 move.l #CONFIG_SYS_FLASH_BASE, %d0 119 movec %d0, %VBR 120#endif 121 122 /* initialize general use internal ram */ 123 move.l #0, %d0 124 move.l #(ICACHE_STATUS), %a1 /* icache */ 125 move.l #(DCACHE_STATUS), %a2 /* dcache */ 126 move.l %d0, (%a1) 127 move.l %d0, (%a2) 128 129 /* put relocation table address to a5 */ 130 move.l #__got_start, %a5 131 132 /* setup stack initially on top of internal static ram */ 133 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 134 135 /* 136 * if configured, malloc_f arena will be reserved first, 137 * then (and always) gd struct space will be reserved 138 */ 139 move.l %sp, -(%sp) 140 bsr board_init_f_alloc_reserve 141 142 /* update stack and frame-pointers */ 143 move.l %d0, %sp 144 move.l %sp, %fp 145 146 /* initialize reserved area */ 147 move.l %d0, -(%sp) 148 bsr board_init_f_init_reserve 149 150 /* run low-level CPU init code (from flash) */ 151 bsr cpu_init_f 152 153 /* run low-level board init code (from flash) */ 154 clr.l %sp@- 155 bsr board_init_f 156 157 /* board_init_f() does not return */ 158 159/*--------------------------------------------------------------------------*/ 160 161/* 162 * void relocate_code (addr_sp, gd, addr_moni) 163 * 164 * This "function" does not return, instead it continues in RAM 165 * after relocating the monitor code. 166 * 167 */ 168 .globl relocate_code 169relocate_code: 170 link.w %a6,#0 171 move.l 8(%a6), %sp /* set new stack pointer */ 172 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 173 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 174 175 move.l #CONFIG_SYS_MONITOR_BASE, %a1 176 move.l #__init_end, %a2 177 move.l %a0, %a3 178 /* copy the code to RAM */ 1791: 180 move.l (%a1)+, (%a3)+ 181 cmp.l %a1,%a2 182 bgt.s 1b 183 184/* 185 * We are done. Do not return, instead branch to second part of board 186 * initialization, now running from RAM. 187 */ 188 move.l %a0, %a1 189 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 190 jmp (%a1) 191 192in_ram: 193 194clear_bss: 195 /* 196 * Now clear BSS segment 197 */ 198 move.l %a0, %a1 199 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1 200 move.l %a0, %d1 201 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1 2026: 203 clr.l (%a1)+ 204 cmp.l %a1,%d1 205 bgt.s 6b 206 207 /* 208 * fix got table in RAM 209 */ 210 move.l %a0, %a1 211 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1 212 /* * fix got pointer register a5 */ 213 move.l %a1,%a5 214 215 move.l %a0, %a2 216 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2 217 2187: 219 move.l (%a1),%d1 220 sub.l #_start, %d1 221 add.l %a0,%d1 222 move.l %d1,(%a1)+ 223 cmp.l %a2, %a1 224 bne 7b 225 226 /* calculate relative jump to board_init_r in ram */ 227 move.l %a0, %a1 228 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 229 230 /* set parameters for board_init_r */ 231 move.l %a0,-(%sp) /* dest_addr */ 232 move.l %d0,-(%sp) /* gd */ 233#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \ 234 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) 235 halt 236#endif 237 jsr (%a1) 238 239/*--------------------------------------------------------------------------*/ 240/* exception code */ 241 .globl _fault 242_fault: 243 bra _fault 244 245 .globl _exc_handler 246_exc_handler: 247 SAVE_ALL 248 movel %sp,%sp@- 249 bsr exc_handler 250 addql #4,%sp 251 RESTORE_ALL 252 253 .globl _int_handler 254_int_handler: 255 SAVE_ALL 256 movel %sp,%sp@- 257 bsr int_handler 258 addql #4,%sp 259 RESTORE_ALL 260 261/*--------------------------------------------------------------------------*/ 262 263 .globl version_string 264version_string: 265 .ascii U_BOOT_VERSION 266 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" 267 .ascii CONFIG_IDENT_STRING, "\0" 268 .align 4 269