2013-01-08 21:05:02 +08:00
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/*
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* File : context.asm
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-04-09 fify the first version
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* 2010-04-19 fify rewrite rt_hw_interrupt_disable/enable fuction
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* 2010-04-20 fify move peripheral ISR to bsp/interrupts.s34
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*/
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.section .text
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.globl _rt_interrupt_from_thread
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.globl _rt_interrupt_to_thread
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.global _os_context_switch
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.type _os_context_switch, @function
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_os_context_switch:
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PUSHM R0,R1,R2,R3,A0,A1,SB,FB
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MOV.W _rt_interrupt_from_thread, A0
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STC ISP, [A0]
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MOV.W _rt_interrupt_to_thread, A0
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LDC [A0], ISP
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POPM R0,R1,R2,R3,A0,A1,SB,FB ; Restore registers from the new task's stack
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REIT ; Return from interrup
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/*
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* void rt_hw_context_switch_to(rt_uint32 to);
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* this fucntion is used to perform the first thread switch
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*/
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.global _rt_hw_context_switch_to
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.type _rt_hw_context_switch_to, @function
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_rt_hw_context_switch_to:
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ENTER #0x0
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MOV.W 0x5[FB], A0
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LDC [A0], ISP
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POPM R0,R1,R2,R3,A0,A1,SB,FB
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REIT
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.end
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