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

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+/*
+ * 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)
+