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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/score/kernel/head.S
10817 views
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/*

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 * arch/score/kernel/head.S

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 *

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 * Score Processor version.

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 *

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 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.

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 *  Chen Liqin <[email protected]>

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 *  Lennox Wu <[email protected]>

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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 as published by

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 * the Free Software Foundation; either version 2 of the License, or

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 * (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, see the file COPYING, or write

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 * to the Free Software Foundation, Inc.,

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 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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 */

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#include <linux/init.h>

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#include <linux/linkage.h>

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#include <asm/asm-offsets.h>

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	.extern start_kernel

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	.global init_thread_union

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	.global	kernelsp

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__INIT

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ENTRY(_stext)

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	la	r30, __bss_start	/* initialize BSS segment. */

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	la	r31, _end

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	xor	r8, r8, r8

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1:	cmp.c	r31, r30

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	beq	2f

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	sw	r8, [r30]		/* clean memory. */

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	addi	r30, 4

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	b	1b

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2:	la	r28, init_thread_union	/* set kernel stack. */

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	mv	r0, r28

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	addi	r0, KERNEL_STACK_SIZE - 32

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	la	r30, kernelsp

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	sw	r0, [r30]

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	subi	r0, 4*4

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	xor	r30, r30, r30

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	ori	r30, 0x02		/* enable MMU. */

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	mtcr	r30, cr4

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	nop

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	nop

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	nop

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	nop

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	nop

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	nop

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	nop

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	/* there is no parameter */

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	xor	r4, r4, r4

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	xor	r5, r5, r5

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	xor	r6, r6, r6

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	xor	r7, r7, r7

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	la	r30, start_kernel	/* jump to init_arch */

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	br	r30

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