106 lines
3.2 KiB
ArmAsm
106 lines
3.2 KiB
ArmAsm
;/*
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; * file : context_rvds.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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; * this program is free software; you can redistribute it and/or modify
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; * it under the terms of the gnu general public license as published by
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; * the free software foundation; either version 2 of the license, or
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; * (at your option) any later version.
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; *
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; * this program is distributed in the hope that it will be useful,
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; * but without any warranty; without even the implied warranty of
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; * merchantability or fitness for a particular purpose. see the
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; * gnu general public license for more details.
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; *
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; * you should have received a copy of the gnu general public license along
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; * with this program; if not, write to the free software foundation, inc.,
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; * 51 franklin street, fifth floor, boston, ma 02110-1301 usa.
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; *
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; * change logs:
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; * date author notes
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; * 2011-08-14 weety copy from mini2440
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; */
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NOINT EQU 0XC0 ; disable interrupt in psr
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AREA |.TEXT|, CODE, READONLY, ALIGN=2
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ARM
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REQUIRE8
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PRESERVE8
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;/*
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; * rt_base_t rt_hw_interrupt_disable();
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; */
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rt_hw_interrupt_disable PROC
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EXPORT 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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BX LR
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ENDP
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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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rt_hw_interrupt_enable proc
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export rt_hw_interrupt_enable
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msr cpsr_c, r0
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bx lr
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endp
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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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rt_hw_context_switch proc
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export 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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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!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc
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endp
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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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rt_hw_context_switch_to proc
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export 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!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc
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endp
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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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import rt_thread_switch_interrupt_flag
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import rt_interrupt_from_thread
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import rt_interrupt_to_thread
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rt_hw_context_switch_interrupt proc
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export rt_hw_context_switch_interrupt
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ldr r2, =rt_thread_switch_interrupt_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 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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bx lr
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endp
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end
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