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Diffstat (limited to 'cpu/coldfire/start.S')
| -rw-r--r-- | cpu/coldfire/start.S | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/cpu/coldfire/start.S b/cpu/coldfire/start.S new file mode 100644 index 0000000..7e02661 --- /dev/null +++ b/cpu/coldfire/start.S @@ -0,0 +1,165 @@ +/* + * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> + * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> + * Copyright (C) 2000-2003 Wolfgang Denk <wd@denx.de> + * Coldfire contribution by Bernhard Kuhn <bkuhn@metrowerks.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include "version.h" + +#ifndef CONFIG_IDENT_STRING +#define CONFIG_IDENT_STRING "" +#endif + +#define MCF_MBAR 0x10000000 +#define MEM_BUILTIN_ADDR 0x20000000 +#define MEM_BUILTIN_SIZE 0x1000 +#define DRAM_ADDR 0x0 +#define DRAM_SIZE 0x400000 + + .text + + .globl _start +_start: + nop + nop + move.w #0x2700,%sr + + move.l #0, %d0 + movec %d0, %VBR + +#ifdef CONFIG_M5272 + move.l #(MCF_MBAR+1), %d0 + move.c %d0, %MBAR + + move.l #(MEM_BUILTIN_ADDR+1), %d0 + movec %d0, %RAMBAR0 + + move.l #0x01000000, %d0 /* Invalidate cache cmd */ + movec %d0, %CACR /* Invalidate cache */ + move.l #0x0000c000, %d0 /* Setup cache mask */ + movec %d0, %ACR0 /* Enable cache */ + move.l #0xff00c000, %d0 /* Setup cache mask */ + movec %d0, %ACR1 /* Enable cache */ + move.l #0x80000100, %d0 /* Setup cache mask */ + movec %d0, %CACR /* Enable cache */ +#endif + + move.l #_sbss,%a0 + move.l #_ebss,%d0 +1: + clr.l (%a0)+ + cmp.l %a0,%d0 + bne.s 1b + +/* move.l #MEM_BUILTIN_ADDR+MEM_BUILTIN_SIZE, %sp */ + move.l #DRAM_ADDR+DRAM_SIZE, %sp + clr.l %sp@- + + jsr board_init_f + + .globl exception_handler +exception_handler: + move.w #0x2700,%sr + lea %sp@(-60),%sp + movem.l %d0-%d7/%a0-%a6,%sp@ + jsr do_exception + movem.l %sp@,%d0-%d7/%a0-%a6 + lea %sp@(60),%sp + rte + + .globl buserror_handler +buserror_handler: + move.w #0x2700,%sr + lea %sp@(-60),%sp + movem.l %d0-%d7/%a0-%a6,%sp@ + jsr do_buserror + movem.l %sp@,%d0-%d7/%a0-%a6 + lea %sp@(60),%sp + rte + + .globl addresserror_handler +addresserror_handler: + move.w #0x2700,%sr + lea %sp@(-60),%sp + movem.l %d0-%d7/%a0-%a6,%sp@ + jsr do_buserror + movem.l %sp@,%d0-%d7/%a0-%a6 + lea %sp@(60),%sp + rte + + .globl get_endaddr +get_endaddr: + movel #_end,%d0 + rts + +#ifdef CONFIG_M5272 + .globl icache_enable +icache_enable: + move.l #0x01000000, %d0 /* Invalidate cache cmd */ + movec %d0, %CACR /* Invalidate cache */ + move.l #0x0000c000, %d0 /* Setup cache mask */ + movec %d0, %ACR0 /* Enable cache */ + move.l #0xff00c000, %d0 /* Setup cache mask */ + movec %d0, %ACR1 /* Enable cache */ + move.l #0x80000100, %d0 /* Setup cache mask */ + movec %d0, %CACR /* Enable cache */ + moveq #1, %d0 + move.l %d0, icache_state + rts + + .globl icache_disable +icache_disable: + move.l #0x00000100, %d0 /* Setup cache mask */ + movec %d0, %CACR /* Enable cache */ + clr.l %d0 /* Setup cache mask */ + movec %d0, %ACR0 /* Enable cache */ + movec %d0, %ACR1 /* Enable cache */ + moveq #0, %d0 + move.l %d0, icache_state + rts +#endif + +#ifdef CONFIG_M5282 + .globl icache_enable +icache_enable: + rts + + .globl icache_disable +icache_disable: + rts +#endif + + .globl icache_status +icache_status: + move.l icache_state, %d0 + rts + + .data +icache_state: + .long 1 + + .globl version_string +version_string: + .ascii U_BOOT_VERSION + .ascii " (", __DATE__, " - ", __TIME__, ")" + .ascii CONFIG_IDENT_STRING, "\0" |