95 lines
2.3 KiB
ArmAsm
95 lines
2.3 KiB
ArmAsm
/*
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* File : context.S
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, 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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* 2006-03-13 Bernard first version
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*/
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#define NOINT 0xc0
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/*
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* rt_base_t rt_hw_interrupt_disable()/*
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*/
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.globl rt_hw_interrupt_disable
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rt_hw_interrupt_disable:
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mrs r0, cpsr
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orr r1, r0, #NOINT
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msr cpsr_c, r1
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mov pc, lr
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/*
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* void rt_hw_interrupt_enable(rt_base_t level)/*
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*/
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.globl rt_hw_interrupt_enable
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rt_hw_interrupt_enable:
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msr cpsr, r0
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mov pc, lr
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/*
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* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)/*
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* r0 --> from
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* r1 --> to
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*/
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.globl rt_hw_context_switch
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rt_hw_context_switch:
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stmfd sp!, {lr} /* push pc (lr should be pushed in place of PC) */
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stmfd sp!, {r0-r12, lr} /* push lr & register file */
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mrs r4, cpsr
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stmfd sp!, {r4} /* push cpsr */
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mrs r4, spsr
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stmfd sp!, {r4} /* push spsr */
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str sp, [r0] /* store sp in preempted tasks TCB */
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ldr sp, [r1] /* get new task stack pointer */
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ldmfd sp!, {r4} /* pop new task spsr */
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msr spsr_cxsf, r4
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ldmfd sp!, {r4} /* pop new task cpsr */
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msr cpsr_cxsf, r4
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ldmfd sp!, {r0-r12, lr, pc} /* pop new task r0-r12, lr & pc */
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/*
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* void rt_hw_context_switch_to(rt_uint32 to)/*
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* r0 --> to
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*/
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.globl rt_hw_context_switch_to
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rt_hw_context_switch_to:
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ldr sp, [r0] /* get new task stack pointer */
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ldmfd sp!, {r4} /* pop new task spsr */
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msr spsr_cxsf, r4
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ldmfd sp!, {r4} /* pop new task cpsr */
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msr cpsr_cxsf, r4
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ldmfd sp!, {r0-r12, lr, pc} /* pop new task r0-r12, lr & pc */
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/*
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* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
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*/
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.globl rt_thread_switch_interrput_flag
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.globl rt_interrupt_from_thread
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.globl rt_interrupt_to_thread
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.globl rt_hw_context_switch_interrupt
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rt_hw_context_switch_interrupt:
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ldr r2, =rt_thread_switch_interrput_flag
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ldr r3, [r2]
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cmp r3, #1
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beq _reswitch
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mov r3, #1 /* set rt_thread_switch_interrput_flag to 1 */
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str r3, [r2]
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ldr r2, =rt_interrupt_from_thread /* set rt_interrupt_from_thread */
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str r0, [r2]
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_reswitch:
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ldr r2, =rt_interrupt_to_thread /* set rt_interrupt_to_thread */
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str r1, [r2]
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mov pc, lr
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