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#define _START _start 14#define _FAULT _fault 15 16 17.macro SAVE_ALL 18 move.w #0x2700,%sr; /* disable intrs */ 19 subl #60,%sp; /* space for 15 regs */ 20 moveml %d0-%d7/%a0-%a6,%sp@ 21.endm 22 23.macro RESTORE_ALL 24 moveml %sp@,%d0-%d7/%a0-%a6; 25 addl #60,%sp; /* space for 15 regs */ 26 rte 27.endm 28 29/* If we come from a pre-loader we don't need an initial exception 30 * table. 31 */ 32#if !defined(CONFIG_MONITOR_IS_IN_RAM) 33 34.text 35 36/* 37 * Vector table. This is used for initial platform startup. 38 * These vectors are to catch any un-intended traps. 39 */ 40_vectors: 41/* Flash offset is 0 until we setup CS0 */ 42.long 0x00000000 43#if defined(CONFIG_M5307) && \ 44 (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) 45.long _start - CONFIG_SYS_TEXT_BASE 46#else 47.long _START 48#endif 49 50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 51.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 52.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 53.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 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 58 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 67 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 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.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 86#endif 87 88.text 89 90.globl _start 91_start: 92 nop 93 nop 94 move.w #0x2700,%sr 95 96 /* set MBAR address + valid flag */ 97 move.l #(CONFIG_SYS_MBAR + 1), %d0 98 move.c %d0, %MBAR 99 100 move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 101 move.c %d0, %RAMBAR 102 103 /* DS 4.8.2 (Cache Organization) invalidate and disable cache */ 104 move.l #CF_CACR_CINVA, %d0 105 movec %d0, %CACR 106 move.l #0, %d0 107 movec %d0, %ACR0 108 movec %d0, %ACR1 109 110 /* 111 * if we come from a pre-loader we have no exception table and 112 * therefore no VBR to set 113 */ 114#if !defined(CONFIG_MONITOR_IS_IN_RAM) 115 move.l #CONFIG_SYS_FLASH_BASE, %d0 116 movec %d0, %VBR 117#endif 118 119 /* initialize general use internal ram */ 120 move.l #0, %d0 121 move.l #(ICACHE_STATUS), %a1 /* icache */ 122 move.l #(DCACHE_STATUS), %a2 /* dcache */ 123 move.l %d0, (%a1) 124 move.l %d0, (%a2) 125 126 /* put relocation table address to a5 */ 127 move.l #__got_start, %a5 128 129 /* setup stack initially on top of internal static ram */ 130 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 131 132 /* 133 * if configured, malloc_f arena will be reserved first, 134 * then (and always) gd struct space will be reserved 135 */ 136 move.l %sp, -(%sp) 137 bsr board_init_f_alloc_reserve 138 139 /* update stack and frame-pointers */ 140 move.l %d0, %sp 141 move.l %sp, %fp 142 143 /* initialize reserved area */ 144 move.l %d0, -(%sp) 145 bsr board_init_f_init_reserve 146 147 /* run low-level CPU init code (from flash) */ 148 bsr cpu_init_f 149 150 /* run low-level board init code (from flash) */ 151 clr.l %sp@- 152 bsr board_init_f 153 154 /* board_init_f() does not return */ 155 156/******************************************************************************/ 157 158/* 159 * void relocate_code (addr_sp, gd, addr_moni) 160 * 161 * This "function" does not return, instead it continues in RAM 162 * after relocating the monitor code. 163 * 164 */ 165.globl relocate_code 166relocate_code: 167 link.w %a6,#0 168 move.l 8(%a6), %sp /* set new stack pointer */ 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 /* copy the code to RAM */ 1761: 177 move.l (%a1)+, (%a3)+ 178 cmp.l %a1,%a2 179 bgt.s 1b 180 181/* 182 * We are done. Do not return, instead branch to second part of board 183 * initialization, now running from RAM. 184 */ 185 move.l %a0, %a1 186 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 187 jmp (%a1) 188 189in_ram: 190 191clear_bss: 192 /* 193 * Now clear BSS segment 194 */ 195 move.l %a0, %a1 196 add.l #(_sbss - CONFIG_SYS_MONITOR_BASE), %a1 197 move.l %a0, %d1 198 add.l #(_ebss - CONFIG_SYS_MONITOR_BASE), %d1 1996: 200 clr.l (%a1)+ 201 cmp.l %a1,%d1 202 bgt.s 6b 203 204 /* 205 * fix got table in RAM 206 */ 207 move.l %a0, %a1 208 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE), %a1 209 210 /* fix got pointer register a5 */ 211 move.l %a1,%a5 212 213 move.l %a0, %a2 214 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE), %a2 215 2167: 217 move.l (%a1),%d1 218 sub.l #_start, %d1 219 add.l %a0,%d1 220 move.l %d1,(%a1)+ 221 cmp.l %a2, %a1 222 bne 7b 223 224 /* calculate relative jump to board_init_r in ram */ 225 move.l %a0, %a1 226 add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 227 228 /* set parameters for board_init_r */ 229 move.l %a0,-(%sp) /* dest_addr */ 230 move.l %d0,-(%sp) /* gd */ 231#if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE!=CONFIG_SYS_INT_FLASH_BASE) && \ 232 defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) 233 halt 234#endif 235 jsr (%a1) 236 237/******************************************************************************/ 238 239/* exception code */ 240.globl _fault 241_fault: 242 bra _fault 243 244.globl _exc_handler 245_exc_handler: 246 SAVE_ALL 247 movel %sp,%sp@- 248 bsr exc_handler 249 addql #4,%sp 250 RESTORE_ALL 251 252.globl _int_handler 253_int_handler: 254 SAVE_ALL 255 movel %sp,%sp@- 256 bsr int_handler 257 addql #4,%sp 258 RESTORE_ALL 259 260/******************************************************************************/ 261 262.globl version_string 263version_string: 264.ascii U_BOOT_VERSION 265.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" 266.ascii CONFIG_IDENT_STRING, "\0" 267.align 4 268