103 lines
2.2 KiB
ArmAsm
103 lines
2.2 KiB
ArmAsm
|
;/*
|
||
|
|
; * Copyright (c) 2006-2018, RT-Thread Development Team
|
||
|
|
; *
|
||
|
|
; * SPDX-License-Identifier: Apache-2.0
|
||
|
|
; *
|
||
|
|
; * Change Logs:
|
||
|
|
; * Date Author Notes
|
||
|
|
; * 2009-01-20 Bernard first version
|
||
|
|
; */
|
||
|
|
|
||
|
|
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
|
||
|
|
MRS r4, spsr
|
||
|
|
STMFD sp!, {r4} ; push spsr
|
||
|
|
|
||
|
|
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!, {r4} ; pop new task cpsr
|
||
|
|
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!, {r4} ; pop new task cpsr
|
||
|
|
MSR cpsr_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 rt_thread_switch_interrupt_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
|