83 lines
2.3 KiB
ArmAsm
83 lines
2.3 KiB
ArmAsm
|
;/*
|
||
|
|
; * Copyright (c) 2006-2021, RT-Thread Development Team
|
||
|
|
; *
|
||
|
|
; * SPDX-License-Identifier: Apache-2.0
|
||
|
|
; *
|
||
|
|
; * Change Logs:
|
||
|
|
; * Date Author Notes
|
||
|
|
; * 2011-08-14 weety copy from mini2440
|
||
|
|
; * 2015-04-15 ArdaFu convert from context_gcc.s
|
||
|
|
; */
|
||
|
|
|
||
|
|
#define NOINT 0xc0
|
||
|
|
|
||
|
|
SECTION .text:CODE(6)
|
||
|
|
/*
|
||
|
|
* rt_base_t rt_hw_interrupt_disable();
|
||
|
|
*/
|
||
|
|
PUBLIC rt_hw_interrupt_disable
|
||
|
|
rt_hw_interrupt_disable:
|
||
|
|
MRS R0, CPSR
|
||
|
|
ORR R1, R0, #NOINT
|
||
|
|
MSR CPSR_C, R1
|
||
|
|
MOV PC, LR
|
||
|
|
|
||
|
|
/*
|
||
|
|
* void rt_hw_interrupt_enable(rt_base_t level);
|
||
|
|
*/
|
||
|
|
PUBLIC rt_hw_interrupt_enable
|
||
|
|
rt_hw_interrupt_enable:
|
||
|
|
MSR CPSR_CXSF, R0
|
||
|
|
MOV PC, LR
|
||
|
|
|
||
|
|
/*
|
||
|
|
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
|
||
|
|
* r0 --> from
|
||
|
|
* r1 --> to
|
||
|
|
*/
|
||
|
|
PUBLIC rt_hw_context_switch
|
||
|
|
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
|
||
|
|
|
||
|
|
/*
|
||
|
|
* void rt_hw_context_switch_to(rt_uint32 to);
|
||
|
|
* r0 --> to
|
||
|
|
*/
|
||
|
|
PUBLIC rt_hw_context_switch_to
|
||
|
|
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
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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
|
||
|
|
PUBLIC rt_hw_context_switch_interrupt
|
||
|
|
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]
|
||
|
|
MOV PC, LR
|
||
|
|
END
|
||
|
|
|