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rm48x50: utilize CPS instruction and remove some useless code

This commit is contained in:
Grissiom 2013-05-26 16:55:39 +08:00
parent f51bce3fed
commit b39d038cf0
1 changed files with 8 additions and 13 deletions
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21
libcpu/arm/rm48x50/context_ccs.asm
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@ -1,5 +1,5 @@
;/*
; * File : context_rvds.S
; * File : context_ccs.asm
; * This file is part of RT-Thread RTOS
; * COPYRIGHT (C) 2006, RT-Thread Development Team
; *
@ -12,6 +12,7 @@
; * 2009-01-20 Bernard first version
; * 2011-07-22 Bernard added thumb mode porting
; * 2013-05-24 Grissiom port to CCS
; * 2013-05-26 Grissiom optimize for ARMv7
; */
.text
@ -29,8 +30,7 @@
.def rt_hw_interrupt_disable
rt_hw_interrupt_disable
MRS r0, cpsr
ORR r1, r0, #0xc0 ; disable irq and fiq in psr
MSR cpsr_c, r1
CPSID IF
BX lr
;/*
@ -48,7 +48,6 @@ rt_hw_interrupt_enable
; */
.def rt_hw_context_switch
rt_hw_context_switch
DSB
STMFD sp!, {lr} ; push pc (lr should be pushed in place of PC)
STMFD sp!, {r0-r12, lr} ; push lr & register file
@ -68,7 +67,6 @@ _ARM_MODE
BIC r4, r4, #0x20 ; must be ARM mode
MSR cpsr_cxsf, r4
DSB
LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr
;/*
@ -81,8 +79,6 @@ rt_hw_context_switch_to
LDMFD sp!, {r4} ; pop new task cpsr to spsr
MSR spsr_cxsf, r4
BIC r4, r4, #0x20 ; must be ARM mode
MSR spsr_cxsf, r4
LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr
@ -139,14 +135,15 @@ rt_hw_context_switch_interrupt_do
MRS r3, spsr ; get cpsr of interrupt thread
; switch to SVC mode and no interrupt
MSR cpsr_c, #0xD3
CPSID IF, #0x13
STMFD sp!, {r2} ; push old task's pc
STMFD sp!, {r4-r12,lr} ; push old task's lr,r12-r4
MOV r4, r1 ; Special optimised code below
MOV r5, r3
LDMFD r4!, {r0-r3}
MOV r4, r1 ; move original irq sp to r4
MOV r5, r3 ; move spsr to r5 FIXME: use `MRS r5 spsr` here?
LDMFD r4!, {r0-r3} ; restore r0-r3 of the interrupted thread
STMFD sp!, {r0-r3} ; push old task's r3-r0
; FIXME: or move the `MRS r5 spsr` here
STMFD sp!, {r5} ; push old task's cpsr
LDR r4, pfromthread
@ -159,8 +156,6 @@ rt_hw_context_switch_interrupt_do
LDMFD sp!, {r4} ; pop new task's cpsr to spsr
MSR spsr_cxsf, r4
BIC r4, r4, #0x20 ; must be ARM mode
MSR cpsr_cxsf, r4
LDMFD sp!, {r0-r12,lr,pc}^ ; pop new task's r0-r12,lr & pc, copy spsr to cpsr