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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 | /* SPDX-License-Identifier: GPL-2.0+ */ /* * (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it> * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> */ #include <asm-offsets.h> #include <config.h> #include <asm/cache.h> #define _START _start #define _FAULT _fault .macro SAVE_ALL move.w #0x2700,%sr; /* disable intrs */ subl #60,%sp; /* space for 15 regs */ moveml %d0-%d7/%a0-%a6,%sp@ .endm .macro RESTORE_ALL moveml %sp@,%d0-%d7/%a0-%a6; addl #60,%sp; /* space for 15 regs */ rte .endm /* If we come from a pre-loader we don't need an initial exception * table. */ #if !defined(CONFIG_MONITOR_IS_IN_RAM) .text /* * Vector table. This is used for initial platform startup. * These vectors are to catch any un-intended traps. */ _vectors: /* Flash offset is 0 until we setup CS0 */ .long 0x00000000 #if defined(CONFIG_M5307) && \ (CONFIG_TEXT_BASE == CFG_SYS_INT_FLASH_BASE) .long _start - CONFIG_TEXT_BASE #else .long _START #endif .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT #endif .text .globl _start _start: nop nop move.w #0x2700,%sr /* set MBAR address + valid flag */ move.l #(CFG_SYS_MBAR + 1), %d0 move.c %d0, %MBAR move.l #(CFG_SYS_INIT_RAM_ADDR + 1), %d0 move.c %d0, %RAMBAR /* DS 4.8.2 (Cache Organization) invalidate and disable cache */ move.l #CF_CACR_CINVA, %d0 movec %d0, %CACR move.l #0, %d0 movec %d0, %ACR0 movec %d0, %ACR1 /* * if we come from a pre-loader we have no exception table and * therefore no VBR to set */ #if !defined(CONFIG_MONITOR_IS_IN_RAM) move.l #CFG_SYS_FLASH_BASE, %d0 movec %d0, %VBR #endif /* initialize general use internal ram */ move.l #0, %d0 move.l #(ICACHE_STATUS), %a1 /* icache */ move.l #(DCACHE_STATUS), %a2 /* dcache */ move.l %d0, (%a1) move.l %d0, (%a2) /* put relocation table address to a5 */ move.l #__got_start, %a5 /* setup stack initially on top of internal static ram */ move.l #(CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_SIZE), %sp /* * if configured, malloc_f arena will be reserved first, * then (and always) gd struct space will be reserved */ move.l %sp, -(%sp) move.l #board_init_f_alloc_reserve, %a1 jsr (%a1) /* update stack and frame-pointers */ move.l %d0, %sp move.l %sp, %fp /* initialize reserved area */ move.l %d0, -(%sp) move.l #board_init_f_init_reserve, %a1 jsr (%a1) /* run low-level CPU init code (from flash) */ move.l #cpu_init_f, %a1 jsr (%a1) /* run low-level board init code (from flash) */ clr.l %sp@- move.l #board_init_f, %a1 jsr (%a1) /* board_init_f() does not return */ /******************************************************************************/ /* * void relocate_code(addr_sp, gd, addr_moni) * * This "function" does not return, instead it continues in RAM * after relocating the monitor code. * */ .globl relocate_code relocate_code: link.w %a6,#0 move.l 8(%a6), %sp /* set new stack pointer */ move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ move.l 16(%a6), %a0 /* Save copy of Destination Address */ move.l #CONFIG_SYS_MONITOR_BASE, %a1 move.l #__init_end, %a2 move.l %a0, %a3 /* copy the code to RAM */ 1: move.l (%a1)+, (%a3)+ cmp.l %a1,%a2 bgt.s 1b #define R_68K_32 1 #define R_68K_RELATIVE 22 move.l #(__rel_dyn_start), %a1 move.l #(__rel_dyn_end), %a2 fixloop: move.l (%a1)+, %d1 /* Elf32_Rela r_offset */ move.l (%a1)+, %d2 /* Elf32_Rela r_info */ move.l (%a1)+, %d3 /* Elf32_Rela r_addend */ andi.l #0xff, %d2 cmp.l #R_68K_32, %d2 beq.s fixup cmp.l #R_68K_RELATIVE, %d2 beq.s fixup bra fixnext fixup: /* relative fix: store addend plus offset at dest location */ move.l %a0, %a3 add.l %d1, %a3 sub.l #CONFIG_SYS_MONITOR_BASE, %a3 move.l (%a3), %d4 add.l %a0, %d4 sub.l #CONFIG_SYS_MONITOR_BASE, %d4 move.l %d4, (%a3) fixnext: cmp.l %a1, %a2 bge.s fixloop /* * We are done. Do not return, instead branch to second part of board * initialization, now running from RAM. */ move.l %a0, %a1 add.l #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1 jmp (%a1) in_ram: clear_bss: /* * Now clear BSS segment */ move.l #(_sbss), %a1 move.l #(_ebss), %d1 6: clr.l (%a1)+ cmp.l %a1,%d1 bgt.s 6b /* * fix got table in RAM */ move.l #(__got_start), %a5 /* fix got pointer register a5 */ /* calculate relative jump to board_init_r in ram */ move.l #(board_init_r), %a1 /* set parameters for board_init_r */ move.l %a0,-(%sp) /* dest_addr */ move.l %d0,-(%sp) /* gd */ jsr (%a1) /******************************************************************************/ /* exception code */ .globl _fault _fault: bra _fault .globl _exc_handler _exc_handler: SAVE_ALL movel %sp,%sp@- move.l #exc_handler, %a1 jsr (%a1) addql #4,%sp RESTORE_ALL .globl _int_handler _int_handler: SAVE_ALL movel %sp,%sp@- move.l #int_handler, %a1 jsr (%a1) addql #4,%sp RESTORE_ALL /******************************************************************************/ .align 4 |