346 lines
9.6 KiB
ArmAsm
346 lines
9.6 KiB
ArmAsm
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/*
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* Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de>
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* Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include "version.h"
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#ifndef CONFIG_IDENT_STRING
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#define CONFIG_IDENT_STRING ""
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#endif
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#define _START _start
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#define _FAULT _fault
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#define SAVE_ALL \
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move.w #0x2700,%sr; /* disable intrs */ \
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subl #60,%sp; /* space for 15 regs */ \
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moveml %d0-%d7/%a0-%a6,%sp@; \
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#define RESTORE_ALL \
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moveml %sp@,%d0-%d7/%a0-%a6; \
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addl #60,%sp; /* space for 15 regs */ \
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rte
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/* If we come from a pre-loader we don't need an initial exception
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* table.
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*/
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#if !defined(CONFIG_MONITOR_IS_IN_RAM)
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.text
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/*
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* Vector table. This is used for initial platform startup.
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* These vectors are to catch any un-intended traps.
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*/
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_vectors:
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.long 0x00000000, _START
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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.long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
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#endif
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.text
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.globl _start
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_start:
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nop
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nop
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move.w #0x2700,%sr
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/* if we come from a pre-loader we have no exception table and
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* therefore no VBR to set
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*/
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#if !defined(CONFIG_MONITOR_IS_IN_RAM)
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move.l #CFG_FLASH_BASE, %d0
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movec %d0, %VBR
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#endif
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#if defined(CONFIG_M5272) || defined(CONFIG_M5249)
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move.l #(CFG_MBAR + 1), %d0 /* set MBAR address + valid flag */
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move.c %d0, %MBAR
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/*** The 5249 has MBAR2 as well ***/
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#ifdef CFG_MBAR2
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move.l #(CFG_MBAR2 + 1), %d0 /* Get MBAR2 address */
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movec %d0, #0xc0e /* Set MBAR2 */
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#endif
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move.l #(CFG_INIT_RAM_ADDR + 1), %d0
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movec %d0, %RAMBAR0
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#endif /* #if defined(CONFIG_M5272) || defined(CONFIG_M5249) */
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#ifdef CONFIG_M5282
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/* Initialize IPSBAR */
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move.l #(CFG_MBAR + 1), %d0 /* set IPSBAR address + valid flag */
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move.l %d0, 0x40000000
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/* Initialize FLASHBAR: locate internal Flash and validate it */
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move.l #(CFG_INT_FLASH_BASE + 0x21), %d0
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movec %d0, %RAMBAR0
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/* Initialize RAMBAR1: locate SRAM and validate it */
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move.l #(CFG_INIT_RAM_ADDR + 0x21), %d0
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movec %d0, %RAMBAR1
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#endif
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/* invalidate and disable cache */
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move.l #0x01000000, %d0 /* Invalidate cache cmd */
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movec %d0, %CACR /* Invalidate cache */
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move.l #0, %d0
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movec %d0, %ACR0
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movec %d0, %ACR1
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/* set stackpointer to end of internal ram to get some stackspace for the first c-code */
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move.l #(CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET), %sp
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clr.l %sp@-
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move.l #__got_start, %a5 /* put relocation table address to a5 */
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bsr cpu_init_f /* run low-level CPU init code (from flash) */
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bsr board_init_f /* run low-level board init code (from flash) */
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/* board_init_f() does not return
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/*------------------------------------------------------------------------------*/
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/*
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* void relocate_code (addr_sp, gd, addr_moni)
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*
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* This "function" does not return, instead it continues in RAM
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* after relocating the monitor code.
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*
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* r3 = dest
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* r4 = src
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* r5 = length in bytes
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* r6 = cachelinesize
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*/
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.globl relocate_code
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relocate_code:
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link.w %a6,#0
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move.l 8(%a6), %sp /* set new stack pointer */
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move.l 12(%a6), %d0 /* Save copy of Global Data pointer */
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move.l 16(%a6), %a0 /* Save copy of Destination Address */
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move.l #CFG_MONITOR_BASE, %a1
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move.l #__init_end, %a2
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move.l %a0, %a3
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/* copy the code to RAM */
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1:
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move.l (%a1)+, (%a3)+
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cmp.l %a1,%a2
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bgt.s 1b
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/*
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* We are done. Do not return, instead branch to second part of board
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* initialization, now running from RAM.
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*/
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move.l %a0, %a1
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add.l #(in_ram - CFG_MONITOR_BASE), %a1
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jmp (%a1)
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in_ram:
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clear_bss:
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/*
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* Now clear BSS segment
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*/
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move.l %a0, %a1
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add.l #(_sbss - CFG_MONITOR_BASE),%a1
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move.l %a0, %d1
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add.l #(_ebss - CFG_MONITOR_BASE),%d1
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6:
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clr.l (%a1)+
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cmp.l %a1,%d1
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bgt.s 6b
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/*
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* fix got table in RAM
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*/
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move.l %a0, %a1
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add.l #(__got_start - CFG_MONITOR_BASE),%a1
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move.l %a1,%a5 /* * fix got pointer register a5 */
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move.l %a0, %a2
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add.l #(__got_end - CFG_MONITOR_BASE),%a2
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7:
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move.l (%a1),%d1
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sub.l #_start,%d1
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add.l %a0,%d1
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move.l %d1,(%a1)+
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cmp.l %a2, %a1
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bne 7b
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/* calculate relative jump to board_init_r in ram */
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move.l %a0, %a1
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add.l #(board_init_r - CFG_MONITOR_BASE), %a1
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/* set parameters for board_init_r */
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move.l %a0,-(%sp) /* dest_addr */
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move.l %d0,-(%sp) /* gd */
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jsr (%a1)
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/*------------------------------------------------------------------------------*/
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/* exception code */
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.globl _fault
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_fault:
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jmp _fault
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.globl _exc_handler
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_exc_handler:
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SAVE_ALL
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movel %sp,%sp@-
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bsr exc_handler
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addql #4,%sp
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RESTORE_ALL
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.globl _int_handler
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_int_handler:
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SAVE_ALL
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movel %sp,%sp@-
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bsr int_handler
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addql #4,%sp
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RESTORE_ALL
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/*------------------------------------------------------------------------------*/
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/* cache functions */
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#ifdef CONFIG_M5272
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.globl icache_enable
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icache_enable:
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move.l #0x01000000, %d0 /* Invalidate cache cmd */
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movec %d0, %CACR /* Invalidate cache */
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move.l #0x0000c000, %d0 /* Setup cache mask */
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movec %d0, %ACR0 /* Enable cache */
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move.l #0xff00c000, %d0 /* Setup cache mask */
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movec %d0, %ACR1 /* Enable cache */
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move.l #0x80000100, %d0 /* Setup cache mask */
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movec %d0, %CACR /* Enable cache */
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moveq #1, %d0
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move.l %d0, icache_state
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rts
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#endif
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#ifdef CONFIG_M5282
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.globl icache_enable
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icache_enable:
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move.l #0x01000000, %d0 /* Invalidate cache cmd */
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movec %d0, %CACR /* Invalidate cache */
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move.l #0x0000c000, %d0 /* Setup cache mask */
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movec %d0, %ACR0 /* Enable cache */
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move.l #0xff00c000, %d0 /* Setup cache mask */
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movec %d0, %ACR1 /* Enable cache */
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move.l #0x80400100, %d0 /* Setup cache mask, data cache disabel*/
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movec %d0, %CACR /* Enable cache */
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moveq #1, %d0
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move.l %d0, icache_state
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rts
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#endif
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#ifdef CONFIG_M5249
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.globl icache_enable
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icache_enable:
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/*
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* Note: The 5249 Documentation doesn't give a bit position for CINV!
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* From the 5272 and the 5307 documentation, I have deduced that it is
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* probably CACR[24]. Should someone say something to Motorola?
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* ~Jeremy
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*/
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move.l #0x01000000, %d0 /* Invalidate whole cache */
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move.c %d0,%CACR
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move.l #0xff00c000, %d0 /* Set FLASH cachable: always match (SM=0b10) */
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move.c %d0, %ACR0
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move.l #0x0000c000, %d0 /* Set SDRAM cachable: always match (SM=0b10) */
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move.c %d0, %ACR1
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move.l #0x90000200, %d0 /* Set cache enable cmd */
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move.c %d0,%CACR
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moveq #1, %d0
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move.l %d0, icache_state
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rts
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#endif
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.globl icache_disable
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icache_disable:
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move.l #0x00000100, %d0 /* Setup cache mask */
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movec %d0, %CACR /* Enable cache */
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clr.l %d0 /* Setup cache mask */
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movec %d0, %ACR0 /* Enable cache */
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movec %d0, %ACR1 /* Enable cache */
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moveq #0, %d0
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move.l %d0, icache_state
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rts
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.globl icache_status
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icache_status:
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move.l icache_state, %d0
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rts
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.data
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icache_state:
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.long 1
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/*------------------------------------------------------------------------------*/
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.globl version_string
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version_string:
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.ascii U_BOOT_VERSION
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.ascii " (", __DATE__, " - ", __TIME__, ")"
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.ascii CONFIG_IDENT_STRING, "\0"
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