71 lines
1.6 KiB
ArmAsm
71 lines
1.6 KiB
ArmAsm
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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 <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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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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