fdf5768a1b
Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* start-arm.c
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*
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* Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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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 modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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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, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <init.h>
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#include <asm/barebox-arm.h>
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#include <asm/system.h>
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#include <asm-generic/memory_layout.h>
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void __naked __section(.text_entry) exception_vectors(void)
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{
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__asm__ __volatile__ (
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"b reset\n" /* reset */
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"ldr pc, =undefined_instruction\n" /* undefined instruction */
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"ldr pc, =software_interrupt\n" /* software interrupt (SWI) */
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"ldr pc, =prefetch_abort\n" /* prefetch abort */
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"ldr pc, =data_abort\n" /* data abort */
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"ldr pc, =not_used\n" /* (reserved) */
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"ldr pc, =irq\n" /* irq (interrupt) */
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"ldr pc, =fiq\n" /* fiq (fast interrupt) */
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);
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}
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extern char __bss_start, _end;
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/*
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* The actual reset vector. This code is position independent and usually
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* does not run at the address it's linked at.
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*/
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void __naked __bare_init reset(void)
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{
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uint32_t r;
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/* set the cpu to SVC32 mode */
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__asm__ __volatile__("mrs %0, cpsr":"=r"(r));
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r &= ~0x1f;
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r |= 0xd3;
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__asm__ __volatile__("msr cpsr, %0" : : "r"(r));
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#ifdef CONFIG_ARCH_HAS_LOWLEVEL_INIT
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arch_init_lowlevel();
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#endif
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__asm__ __volatile__ (
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"bl __mmu_cache_flush;"
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:
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:
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: "r0", "r1", "r2", "r3", "r6", "r10", "r12", "cc", "memory"
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);
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/* disable MMU stuff and caches */
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r = get_cr();
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r &= ~(CR_M | CR_C | CR_B | CR_S | CR_R | CR_V);
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r |= CR_A | CR_I;
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#ifdef __ARMEB__
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r |= CR_B;
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#endif
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set_cr(r);
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#ifdef CONFIG_MACH_DO_LOWLEVEL_INIT
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board_init_lowlevel();
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#endif
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board_init_lowlevel_return();
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}
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/*
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* Board code can jump here by either returning from board_init_lowlevel
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* or by calling this funtion directly.
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*/
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void __naked __bare_init board_init_lowlevel_return(void)
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{
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uint32_t r, addr;
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/*
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* Get runtime address of this function. Do not
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* put any code above this.
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*/
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__asm__ __volatile__("1: adr %0, 1b":"=r"(addr));
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/* Setup the stack */
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r = STACK_BASE + STACK_SIZE - 16;
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__asm__ __volatile__("mov sp, %0" : : "r"(r));
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/* Get start of binary image */
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addr -= (uint32_t)&board_init_lowlevel_return - TEXT_BASE;
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/* relocate to link address if necessary */
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if (addr != TEXT_BASE)
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memcpy((void *)TEXT_BASE, (void *)addr,
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(unsigned int)&__bss_start - TEXT_BASE);
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/* clear bss */
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memset(&__bss_start, 0, &_end - &__bss_start);
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/* call start_barebox with its absolute address */
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r = (unsigned int)&start_barebox;
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__asm__ __volatile__("mov pc, %0" : : "r"(r));
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}
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