From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/score/kernel/head.S | 70 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 arch/score/kernel/head.S (limited to 'arch/score/kernel/head.S') diff --git a/arch/score/kernel/head.S b/arch/score/kernel/head.S new file mode 100644 index 00000000..22a7e3c7 --- /dev/null +++ b/arch/score/kernel/head.S @@ -0,0 +1,70 @@ +/* + * arch/score/kernel/head.S + * + * Score Processor version. + * + * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. + * Chen Liqin + * Lennox Wu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include +#include + +#include + + .extern start_kernel + .global init_thread_union + .global kernelsp + +__INIT +ENTRY(_stext) + la r30, __bss_start /* initialize BSS segment. */ + la r31, _end + xor r8, r8, r8 + +1: cmp.c r31, r30 + beq 2f + + sw r8, [r30] /* clean memory. */ + addi r30, 4 + b 1b + +2: la r28, init_thread_union /* set kernel stack. */ + mv r0, r28 + addi r0, KERNEL_STACK_SIZE - 32 + la r30, kernelsp + sw r0, [r30] + subi r0, 4*4 + xor r30, r30, r30 + ori r30, 0x02 /* enable MMU. */ + mtcr r30, cr4 + nop + nop + nop + nop + nop + nop + nop + + /* there is no parameter */ + xor r4, r4, r4 + xor r5, r5, r5 + xor r6, r6, r6 + xor r7, r7, r7 + la r30, start_kernel /* jump to init_arch */ + br r30 -- cgit v1.3.1