rt-thread/libcpu/mips/x1000/mips_context_gcc.S

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2017-11-08 19:47:45 +08:00
/*
* File : mips_context_asm.S
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2016<EFBFBD><EFBFBD>9<EFBFBD><EFBFBD>7<EFBFBD><EFBFBD> Urey the first version
*/
#ifndef __ASSEMBLY__
# define __ASSEMBLY__
#endif
#include "../common/mips.h"
.global rt_thread_switch_interrupt_flag
.global rt_interrupt_from_thread
.global rt_interrupt_to_thread
.section .text,"ax",@progbits
.set noreorder
.set noat
.globl rt_hw_interrupt_disable
rt_hw_interrupt_disable:
mfc0 v0,CP0_STATUS
srl v1,v0,1
sll v1,v1,1
# and v1,v0,0xfffffffe
mtc0 v1,CP0_STATUS
jr ra
nop
LEAF(rt_hw_interrupt_enable)
mtc0 a0,CP0_STATUS
jr ra
nop
END(rt_hw_interrupt_enable)
/*
* void rt_hw_context_switch_to(rt_uint32 to)/*
* a0 --> to
*/
LEAF(rt_hw_context_switch_to)
lw sp , 0(a0) /* switch to the new stack */
RESTORE_CONTEXT
END(rt_hw_context_switch_to)
/*
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)
* a0 --> from
* a1 --> to
*/
LEAF(rt_hw_context_switch)
mtc0 ra, CP0_EPC
SAVE_CONTEXT
sw sp, 0(a0) /* store sp in preempted tasks TCB */
lw sp, 0(a1) /* get new task stack pointer */
RESTORE_CONTEXT
END(rt_hw_context_switch)
LEAF(rt_hw_context_switch_interrupt)
la t0, rt_thread_switch_interrupt_flag
lw t1, 0(t0)
nop
bnez t1, _reswitch
nop
li t1, 0x01 /* set rt_thread_switch_interrupt_flag to 1 */
sw t1, 0(t0)
la t0, rt_interrupt_from_thread /* set rt_interrupt_from_thread */
sw a0, 0(t0)
_reswitch:
la t0, rt_interrupt_to_thread /* set rt_interrupt_to_thread */
sw a1, 0(t0)
jr ra
nop
END(rt_hw_context_switch_interrupt)