RT-Thread_v4.1.1
This commit is contained in:
91
libcpu/arm/arm926/context_rvds.S
Normal file
91
libcpu/arm/arm926/context_rvds.S
Normal file
@ -0,0 +1,91 @@
|
||||
;/*
|
||||
; * 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
|
Reference in New Issue
Block a user