68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
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* start-reset.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/system.h>
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#include <asm/barebox-arm.h>
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#include <asm/sections.h>
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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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/* 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_I;
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#if __LINUX_ARM_ARCH__ >= 6
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r |= CR_U;
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#else
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r |= CR_A;
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#endif
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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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