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rtt-f030/libcpu/arm/rm48x50/context_ccs.asm

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add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
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;/*
rm48x50: utilize CPS instruction and remove some useless code
2013-05-26 16:55:39 +08:00
; * File : context_ccs.asm
add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
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; * This file is part of RT-Thread RTOS
; * COPYRIGHT (C) 2006, RT-Thread Development Team
; *
; * The license and distribution terms for this file may be
; * found in the file LICENSE in this distribution or at
; * http://www.rt-thread.org/license/LICENSE
; *
; * Change Logs:
; * Date Author Notes
; * 2009-01-20 Bernard first version
; * 2011-07-22 Bernard added thumb mode porting
; * 2013-05-24 Grissiom port to CCS
rm48x50: utilize CPS instruction and remove some useless code
2013-05-26 16:55:39 +08:00
; * 2013-05-26 Grissiom optimize for ARMv7
add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
2013-05-24 10:04:51 +08:00
; */
.text
.arm
.ref rt_thread_switch_interrupt_flag
.ref rt_interrupt_from_thread
.ref rt_interrupt_to_thread
.ref rt_interrupt_enter
.ref rt_interrupt_leave
.ref rt_hw_trap_irq
;/*
; * rt_base_t rt_hw_interrupt_disable();
; */
.def rt_hw_interrupt_disable
rt_hw_interrupt_disable
MRS r0, cpsr
rm48x50: utilize CPS instruction and remove some useless code
2013-05-26 16:55:39 +08:00
CPSID IF
add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
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BX lr
;/*
; * void rt_hw_interrupt_enable(rt_base_t level);
; */
.def rt_hw_interrupt_enable
rt_hw_interrupt_enable
MSR cpsr_c, r0
BX lr
;/*
; * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
; * r0 --> from
; * r1 --> to
; */
.def 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
TST lr, #0x01
BEQ _ARM_MODE
ORR r4, r4, #0x20 ; it's thumb code
_ARM_MODE
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 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 r0-r12, lr & pc, copy spsr to cpsr
;/*
; * void rt_hw_context_switch_to(rt_uint32 to);
; * r0 --> to
; */
.def rt_hw_context_switch_to
rt_hw_context_switch_to
LDR sp, [r0] ; get new task stack pointer
LDMFD sp!, {r4} ; pop new task cpsr to spsr
MSR spsr_cxsf, r4
LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr
;/*
; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
; */
.def rt_hw_context_switch_interrupt
rt_hw_context_switch_interrupt
LDR r2, pintflag
LDR r3, [r2]
CMP r3, #1
BEQ _reswitch
MOV r3, #1 ; set rt_thread_switch_interrupt_flag to 1
STR r3, [r2]
LDR r2, pfromthread ; set rt_interrupt_from_thread
STR r0, [r2]
_reswitch
LDR r2, ptothread ; set rt_interrupt_to_thread
STR r1, [r2]
BX lr
.def IRQ_Handler
IRQ_Handler
STMFD sp!, {r0-r12,lr}
BL rt_interrupt_enter
BL rt_hw_trap_irq
BL rt_interrupt_leave
; if rt_thread_switch_interrupt_flag set, jump to
; rt_hw_context_switch_interrupt_do and don't return
LDR r0, pintflag
LDR r1, [r0]
CMP r1, #1
BEQ rt_hw_context_switch_interrupt_do
LDMFD sp!, {r0-r12,lr}
SUBS pc, lr, #4
; /*
; * void rt_hw_context_switch_interrupt_do(rt_base_t flag)
; */
.def rt_hw_context_switch_interrupt_do
rt_hw_context_switch_interrupt_do
MOV r1, #0 ; clear flag
STR r1, [r0]
LDMFD sp!, {r0-r12,lr} ; reload saved registers
rm48x50: optimize context_switch_interrupt_do Substitude STMFD, MOV, ADD with STMFD, SUB. It reduce one instruction. Tested on board and it works like a charm.
2013-05-26 17:10:49 +08:00
STMFD sp, {r0-r3} ; save r0-r3. We will restore r0-r3 in the SVC
; mode so there is no need to update SP.
SUB r1, sp, #16 ; save the right SP value in r1, so we could restore r0-r3.
add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
2013-05-24 10:04:51 +08:00
SUB r2, lr, #4 ; save old task's pc to r2
MRS r3, spsr ; get cpsr of interrupt thread
; switch to SVC mode and no interrupt
rm48x50: utilize CPS instruction and remove some useless code
2013-05-26 16:55:39 +08:00
CPSID IF, #0x13
add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
2013-05-24 10:04:51 +08:00
STMFD sp!, {r2} ; push old task's pc
STMFD sp!, {r4-r12,lr} ; push old task's lr,r12-r4
rm48x50: optimize context_switch_interrupt_to by reuse registers When saving thread registers in context_switch_interrupt_to, we don't change them, just move them. So there is no need to always r0-r3 from stack to the real r0-r3. So just use the intermediate registers and eliminate 2 MOV.
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LDMFD r1!, {r4-r7} ; restore r0-r3 of the interrupted thread
STMFD sp!, {r4-r7} ; push old task's r3-r0. We don't need to push/pop them to
; r0-r3 because we just want to transfer the data and don't
; use them here.
STMFD sp!, {r3} ; push old task's cpsr
add rm48x50 bsp and libcpu We currently only support building with CCS and SCons is not using. bsp/rm48x50/HALCoGen/HALCoGen.{hcg,dil} is the HALCoGen project file. You may need to regenerate the source file as you like, providing that: 1, IRQ is in Dispatch Mode and the table entry is IRQ_Handler. The channel 5 in enabled and connected to IRQ. 2, RTI driver is enabled and compare3 source is selected to counter1 and the compare3 will generate tick in the period of 10ms. This value is coresponding with RT_TICK_PER_SECOND in rtconfig.h. In CCS, you need to create a new CCS project and create link folders pointing at bsp/rm48x50, libcpu/arm/rm48x50 and src/, include/. Remember to add the include path to the Build Properties.
2013-05-24 10:04:51 +08:00
LDR r4, pfromthread
LDR r5, [r4]
STR sp, [r5] ; store sp in preempted tasks's TCB
LDR r6, ptothread
LDR r6, [r6]
LDR sp, [r6] ; get new task's stack pointer
LDMFD sp!, {r4} ; pop new task's cpsr to spsr
MSR spsr_cxsf, r4
LDMFD sp!, {r0-r12,lr,pc}^ ; pop new task's r0-r12,lr & pc, copy spsr to cpsr
pintflag .word rt_thread_switch_interrupt_flag
pfromthread .word rt_interrupt_from_thread
ptothread .word rt_interrupt_to_thread