2019-01-07 06:09:45 +08:00
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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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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* 2015-04-15 ArdaFu convert from context_gcc.s
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*/
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2015-04-14 21:56:34 +08:00
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#define NOINT 0xc0
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SECTION .text:CODE(6)
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/*
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* rt_base_t rt_hw_interrupt_disable();
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*/
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PUBLIC 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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PUBLIC rt_hw_interrupt_enable
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rt_hw_interrupt_enable:
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MSR CPSR_CXSF, 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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PUBLIC 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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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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/*
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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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PUBLIC 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!, {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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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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PUBLIC rt_hw_context_switch_interrupt
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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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MOV PC, LR
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END
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