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 /* 130 * set stackpointer to internal sram end - 80 131 * (global data struct size + some bytes) 132 * get some stackspace for the first c-code, 133 */ 134 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp 135 clr.l %sp@- 136 137 /* put relocation table address to a5 */ 138 move.l #__got_start, %a5 139 140 /* run low-level CPU init code (from flash) */ 141 bsr cpu_init_f 142 143 /* run low-level board init code (from flash) */ 144 bsr board_init_f 145 146 /* board_init_f() does not return */ 147 148/*--------------------------------------------------------------------------*/ 149 150/* 151 * void relocate_code (addr_sp, gd, addr_moni) 152 * 153 * This "function" does not return, instead it continues in RAM 154 * after relocating the monitor code. 155 * 156 */ 157 .globl relocate_code 158relocate_code: 159 link.w %a6,#0 160 move.l 8(%a6), %sp /* set new stack pointer */ 161 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 162 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 163 164 move.l #CONFIG_SYS_MONITOR_BASE, %a1 165 move.l #__init_end, %a2 166 move.l %a0, %a3 167 /* copy the code to RAM */ 1681: 169 move.l (%a1)+, (%a3)+ 170 cmp.l %a1,%a2 171 bgt.s 1b 172 173/* 174 * We are done. Do not return, instead branch to second part of board 175 * initialization, now running from RAM. 176 */ 177 move.l %a0, %a1 178 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 179 jmp (%a1) 180 181in_ram: 182 183clear_bss: 184 /* 185 * Now clear BSS segment 186 */ 187 move.l %a0, %a1 188 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1 189 move.l %a0, %d1 190 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1 1916: 192 clr.l (%a1)+ 193 cmp.l %a1,%d1 194 bgt.s 6b 195 196 /* 197 * fix got table in RAM 198 */ 199 move.l %a0, %a1 200 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1 201 /* * fix got pointer register a5 */ 202 move.l %a1,%a5 203 204 move.l %a0, %a2 205 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2 206 2077: 208 move.l (%a1),%d1 209 sub.l #_start, %d1 210 add.l %a0,%d1 211 move.l %d1,(%a1)+ 212 cmp.l %a2, %a1 213 bne 7b 214 215 /* calculate relative jump to board_init_r in ram */ 216 move.l %a0, %a1 217 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 218 219 /* set parameters for board_init_r */ 220 move.l %a0,-(%sp) /* dest_addr */ 221 move.l %d0,-(%sp) /* gd */ 222#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \ 223 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) 224 halt 225#endif 226 jsr (%a1) 227 228/*--------------------------------------------------------------------------*/ 229/* exception code */ 230 .globl _fault 231_fault: 232 bra _fault 233 234 .globl _exc_handler 235_exc_handler: 236 SAVE_ALL 237 movel %sp,%sp@- 238 bsr exc_handler 239 addql #4,%sp 240 RESTORE_ALL 241 242 .globl _int_handler 243_int_handler: 244 SAVE_ALL 245 movel %sp,%sp@- 246 bsr int_handler 247 addql #4,%sp 248 RESTORE_ALL 249 250/*--------------------------------------------------------------------------*/ 251 252 .globl version_string 253version_string: 254 .ascii U_BOOT_VERSION 255 .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" 256 .ascii CONFIG_IDENT_STRING, "\0" 257 .align 4 258