1/* 2 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 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#define SAVE_ALL \ 17 move.w #0x2700,%sr; /* disable intrs */ \ 18 subl #60,%sp; /* space for 15 regs */ \ 19 moveml %d0-%d7/%a0-%a6,%sp@; 20 21#define RESTORE_ALL \ 22 moveml %sp@,%d0-%d7/%a0-%a6; \ 23 addl #60,%sp; /* space for 15 regs */ \ 24 rte; 25 26.text 27 28/* 29 * Vector table. This is used for initial platform startup. 30 * These vectors are to catch any un-intended traps. 31 */ 32_vectors: 33INITSP: .long 0x00000000 /* Initial SP */ 34INITPC: .long _START /* Initial PC */ 35 36vector02_0F: 37.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 38.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 39 40/* Reserved */ 41vector10_17: 42.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 43 44vector18_1F: 45.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 46 47/* TRAP #0 - #15 */ 48vector20_2F: 49.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 50.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 51 52/* Reserved */ 53vector30_3F: 54.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 55.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 56 57vector64_127: 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, _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 67vector128_191: 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 77vector192_255: 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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 86 87.text 88 89.globl _start 90_start: 91 nop 92 nop 93 move.w #0x2700,%sr /* Mask off Interrupt */ 94 95 /* Set vector base register at the beginning of the Flash */ 96 move.l #CONFIG_SYS_FLASH_BASE, %d0 97 movec %d0, %VBR 98 99 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0 100 movec %d0, %RAMBAR0 101 102 move.l #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0 103 movec %d0, %RAMBAR1 104 105 move.l #CONFIG_SYS_MBAR, %d0 /* set MBAR address */ 106 move.c %d0, %MBAR 107 108 /* invalidate and disable cache */ 109 move.l #0x01040100, %d0 /* Invalidate cache cmd */ 110 movec %d0, %CACR /* Invalidate cache */ 111 move.l #0, %d0 112 movec %d0, %ACR0 113 movec %d0, %ACR1 114 movec %d0, %ACR2 115 movec %d0, %ACR3 116 117 /* initialize general use internal ram */ 118 move.l #0, %d0 119 move.l #(ICACHE_STATUS), %a1 /* icache */ 120 move.l #(DCACHE_STATUS), %a2 /* icache */ 121 move.l %d0, (%a1) 122 move.l %d0, (%a2) 123 124 /* put relocation table address to a5 */ 125 move.l #__got_start, %a5 126 127 /* setup stack initially on top of internal static ram */ 128 move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp 129 130 /* 131 * if configured, malloc_f arena will be reserved first, 132 * then (and always) gd struct space will be reserved 133 */ 134 move.l %sp, -(%sp) 135 bsr board_init_f_alloc_reserve 136 137 /* update stack and frame-pointers */ 138 move.l %d0, %sp 139 move.l %sp, %fp 140 141 /* initialize reserved area */ 142 move.l %d0, -(%sp) 143 bsr board_init_f_init_reserve 144 145 /* run low-level CPU init code (from flash) */ 146 jbsr cpu_init_f 147 148 /* run low-level board init code (from flash) */ 149 clr.l %sp@- 150 jbsr board_init_f 151 152 /* board_init_f() does not return */ 153 154/******************************************************************************/ 155 156/* 157 * void relocate_code (addr_sp, gd, addr_moni) 158 * 159 * This "function" does not return, instead it continues in RAM 160 * after relocating the monitor code. 161 * 162 * r3 = dest 163 * r4 = src 164 * r5 = length in bytes 165 * r6 = cachelinesize 166 */ 167.globl relocate_code 168relocate_code: 169 link.w %a6,#0 170 move.l 8(%a6), %sp /* set new stack pointer */ 171 172 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 178 179 /* 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 move.l %a1,%a5 /* fix got pointer register 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 jsr (%a1) 234 235/******************************************************************************/ 236 237/* exception code */ 238.globl _fault 239_fault: 240 bra _fault 241 242.globl _exc_handler 243_exc_handler: 244 SAVE_ALL 245 movel %sp,%sp@- 246 bsr exc_handler 247 addql #4,%sp 248 RESTORE_ALL 249 250.globl _int_handler 251_int_handler: 252 SAVE_ALL 253 movel %sp,%sp@- 254 bsr int_handler 255 addql #4,%sp 256 RESTORE_ALL 257 258/******************************************************************************/ 259 260.globl version_string 261version_string: 262.ascii U_BOOT_VERSION_STRING, "\0" 263.align 4 264