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;/*
; * Copyright (c) 2006-2018, RT-Thread Development Team
; *
; * SPDX-License-Identifier: Apache-2.0
; *
; * Change Logs:
; * Date Author Notes
; * 2011-08-14 weety copy from mini2440
; */
NOINT EQU 0XC0 ; disable interrupt in psr
AREA |.TEXT|, CODE, READONLY, ALIGN=2
ARM
REQUIRE8
PRESERVE8
;/*
; * rt_base_t rt_hw_interrupt_disable();
; */
rt_hw_interrupt_disable PROC
EXPORT rt_hw_interrupt_disable
MRS R0, CPSR
ORR R1, R0, #NOINT
MSR CPSR_C, R1
BX LR
ENDP
;/*
; * void rt_hw_interrupt_enable(rt_base_t level);
; */
rt_hw_interrupt_enable proc
export rt_hw_interrupt_enable
msr cpsr_c, r0
bx lr
endp
;/*
; * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
; * r0 --> from
; * r1 --> to
; */
rt_hw_context_switch proc
export rt_hw_context_switch
stmfd sp!, {lr} ; push pc (lr should be pushed in place of pc)
stmfd sp!, {r0-r12, lr} ; push lr & register file
mrs r4, cpsr
stmfd sp!, {r4} ; push cpsr
str sp, [r0] ; store sp in preempted tasks tcb
ldr sp, [r1] ; get new task stack pointer
ldmfd sp!, {r4} ; pop new task spsr
msr spsr_cxsf, r4
ldmfd sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc
endp
;/*
; * void rt_hw_context_switch_to(rt_uint32 to);
; * r0 --> to
; */
rt_hw_context_switch_to proc
export rt_hw_context_switch_to
ldr sp, [r0] ; get new task stack pointer
ldmfd sp!, {r4} ; pop new task spsr
msr spsr_cxsf, r4
ldmfd sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc
endp
;/*
; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
; */
import rt_thread_switch_interrupt_flag
import rt_interrupt_from_thread
import rt_interrupt_to_thread
rt_hw_context_switch_interrupt proc
export rt_hw_context_switch_interrupt
ldr r2, =rt_thread_switch_interrupt_flag
ldr r3, [r2]
cmp r3, #1
beq _reswitch
mov r3, #1 ; set flag to 1
str r3, [r2]
ldr r2, =rt_interrupt_from_thread ; set rt_interrupt_from_thread
str r0, [r2]
_reswitch
ldr r2, =rt_interrupt_to_thread ; set rt_interrupt_to_thread
str r1, [r2]
bx lr
endp
end
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