1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> 4 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> 5 */ 6 7#include <asm-offsets.h> 8#include <config.h> 9#include <asm/cache.h> 10 11#define _START _start 12#define _FAULT _fault 13 14#define SAVE_ALL \ 15 move.w #0x2700,%sr; /* disable intrs */ \ 16 subl #60,%sp; /* space for 15 regs */ \ 17 moveml %d0-%d7/%a0-%a6,%sp@; 18 19#define RESTORE_ALL \ 20 moveml %sp@,%d0-%d7/%a0-%a6; \ 21 addl #60,%sp; /* space for 15 regs */ \ 22 rte; 23 24.text 25 26/* 27 * Vector table. This is used for initial platform startup. 28 * These vectors are to catch any un-intended traps. 29 */ 30_vectors: 31INITSP: .long 0x00000000 /* Initial SP */ 32INITPC: .long _START /* Initial PC */ 33 34vector02_0F: 35.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 36.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 37 38/* Reserved */ 39vector10_17: 40.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 41 42vector18_1F: 43.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 44 45/* TRAP #0 - #15 */ 46vector20_2F: 47.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 48.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 49 50/* Reserved */ 51vector30_3F: 52.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 53.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 54 55vector64_127: 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, _FAULT, _FAULT 62.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 63.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT 64 65vector128_191: 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.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 75vector192_255: 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.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 85.text 86 87.globl _start 88_start: 89 nop 90 nop 91 move.w #0x2700,%sr /* Mask off Interrupt */ 92 93 /* Set vector base register at the beginning of the Flash */ 94 move.l #CFG_SYS_FLASH_BASE, %d0 95 movec %d0, %VBR 96 97 move.l #(CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_CTRL), %d0 98 movec %d0, %RAMBAR1 99 100 /* invalidate and disable cache */ 101 move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */ 102 movec %d0, %CACR /* Invalidate cache */ 103 nop 104 move.l #0, %d0 105 movec %d0, %ACR0 106 movec %d0, %ACR1 107 108 /* initialize general use internal ram */ 109 move.l #0, %d0 110 move.l #(ICACHE_STATUS), %a1 /* icache */ 111 move.l #(DCACHE_STATUS), %a2 /* icache */ 112 move.l %d0, (%a1) 113 move.l %d0, (%a2) 114 115 /* put relocation table address to a5 */ 116 move.l #__got_start, %a5 117 118 /* setup stack initially on top of internal static ram */ 119 move.l #(CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_SIZE), %sp 120 121 /* 122 * if configured, malloc_f arena will be reserved first, 123 * then (and always) gd struct space will be reserved 124 */ 125 move.l %sp, -(%sp) 126 move.l #board_init_f_alloc_reserve, %a1 127 jsr (%a1) 128 129 /* update stack and frame-pointers */ 130 move.l %d0, %sp 131 move.l %sp, %fp 132 133 /* initialize reserved area */ 134 move.l %d0, -(%sp) 135 move.l #board_init_f_init_reserve, %a1 136 jsr (%a1) 137 138 /* run low-level CPU init code (from flash) */ 139 move.l #cpu_init_f, %a1 140 jsr (%a1) 141 142 /* run low-level board init code (from flash) */ 143 clr.l %sp@- 144 move.l #board_init_f, %a1 145 jsr (%a1) 146 147 /* board_init_f() does not return */ 148 149/******************************************************************************/ 150 151/* 152 * void relocate_code(addr_sp, gd, addr_moni) 153 * 154 * This "function" does not return, instead it continues in RAM 155 * after relocating the monitor code. 156 * 157 * r3 = dest 158 * r4 = src 159 * r5 = length in bytes 160 * r6 = cachelinesize 161 */ 162.globl relocate_code 163relocate_code: 164 link.w %a6,#0 165 move.l 8(%a6), %sp /* set new stack pointer */ 166 167 move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ 168 move.l 16(%a6), %a0 /* Save copy of Destination Address */ 169 170 move.l #CONFIG_SYS_MONITOR_BASE, %a1 171 move.l #__init_end, %a2 172 move.l %a0, %a3 173 174 /* copy the code to RAM */ 1751: 176 move.l (%a1)+, (%a3)+ 177 cmp.l %a1,%a2 178 bgt.s 1b 179 180#define R_68K_32 1 181#define R_68K_RELATIVE 22 182 183 move.l #(__rel_dyn_start), %a1 184 move.l #(__rel_dyn_end), %a2 185 186fixloop: 187 move.l (%a1)+, %d1 /* Elf32_Rela r_offset */ 188 move.l (%a1)+, %d2 /* Elf32_Rela r_info */ 189 move.l (%a1)+, %d3 /* Elf32_Rela r_addend */ 190 191 andi.l #0xff, %d2 192 cmp.l #R_68K_32, %d2 193 beq.s fixup 194 cmp.l #R_68K_RELATIVE, %d2 195 beq.s fixup 196 197 bra fixnext 198 199fixup: 200 /* relative fix: store addend plus offset at dest location */ 201 move.l %a0, %a3 202 add.l %d1, %a3 203 sub.l #CONFIG_SYS_MONITOR_BASE, %a3 204 move.l (%a3), %d4 205 add.l %a0, %d4 206 sub.l #CONFIG_SYS_MONITOR_BASE, %d4 207 move.l %d4, (%a3) 208 209fixnext: 210 cmp.l %a1, %a2 211 bge.s fixloop 212 213/* 214 * We are done. Do not return, instead branch to second part of board 215 * initialization, now running from RAM. 216 */ 217 move.l %a0, %a1 218 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 219 jmp (%a1) 220 221in_ram: 222 223clear_bss: 224 /* 225 * Now clear BSS segment 226 */ 227 move.l #(_sbss), %a1 228 move.l #(_ebss), %d1 2296: 230 clr.l (%a1)+ 231 cmp.l %a1,%d1 232 bgt.s 6b 233 234 /* 235 * fix got table in RAM 236 */ 237 move.l #(__got_start), %a5 /* fix got pointer register a5 */ 238 239 /* calculate relative jump to board_init_r in ram */ 240 move.l #(board_init_r), %a1 241 242 /* set parameters for board_init_r */ 243 move.l %a0,-(%sp) /* dest_addr */ 244 move.l %d0,-(%sp) /* gd */ 245 jsr (%a1) 246 247/******************************************************************************/ 248 249/* exception code */ 250.globl _fault 251_fault: 252 bra _fault 253 254.globl _exc_handler 255_exc_handler: 256 SAVE_ALL 257 movel %sp,%sp@- 258 bsr exc_handler 259 addql #4,%sp 260 RESTORE_ALL 261 262.globl _int_handler 263_int_handler: 264 SAVE_ALL 265 movel %sp,%sp@- 266 bsr int_handler 267 addql #4,%sp 268 RESTORE_ALL 269 270/******************************************************************************/ 271 272.align 4 273