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Richard 祝发兴 - -IT
rt-thread
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06920fe7
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rt-thread
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06920fe7
编写于
2月 06, 2017
作者:
B
Bernard Xiong
提交者:
GitHub
2月 06, 2017
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Merge pull request #695 from zchong-cht/master
[bsp] Add libcpu/arm/am335x/context_iar.S file
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a7c4a23c
a74a2a25
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libcpu/arm/am335x/context_iar.S
libcpu/arm/am335x/context_iar.S
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libcpu/arm/am335x/context_iar.S
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06920fe7
;/*
; * File : context_iar.S
; * This file is part of RT-Thread RTOS
; * COPYRIGHT (C) 2006, RT-Thread Development Team
; *
; * This program is free software; you can redistribute it and/or modify
; * it under the terms of the GNU General Public License as published by
; * the Free Software Foundation; either version 2 of the License, or
; * (at your option) any later version.
; *
; * This program is distributed in the hope that it will be useful,
; * but WITHOUT ANY WARRANTY; without even the implied warranty of
; * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; * GNU General Public License for more details.
; *
; * You should have received a copy of the GNU General Public License along
; * with this program; if not, write to the Free Software Foundation, Inc.,
; * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
; *
; * 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
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