161 lines
3.8 KiB
ArmAsm
161 lines
3.8 KiB
ArmAsm
/*
|
|
* File : context.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
|
|
* 2011-01-13 weety copy from mini2440
|
|
*/
|
|
|
|
#define NOINT 0xc0
|
|
|
|
.globl __delay
|
|
__delay:
|
|
subs r0, r0, #1
|
|
#if 1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
movls pc, lr
|
|
subs r0, r0, #1
|
|
#endif
|
|
bhi __delay
|
|
mov pc, lr
|
|
|
|
|
|
/*
|
|
* rt_base_t rt_hw_interrupt_disable();
|
|
*/
|
|
.globl 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);
|
|
*/
|
|
.globl rt_hw_interrupt_enable
|
|
rt_hw_interrupt_enable:
|
|
msr cpsr, r0
|
|
mov pc, lr
|
|
|
|
|
|
.globl restore_context
|
|
@.func restore_context
|
|
|
|
.globl save_context
|
|
@.func save_context
|
|
|
|
save_context:
|
|
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
|
|
mov pc, lr
|
|
bx lr @ branch back to caller
|
|
|
|
|
|
restore_context:
|
|
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 spsr_cxsf, r4
|
|
|
|
ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc
|
|
|
|
|
|
|
|
/*
|
|
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
|
|
* r0 --> from
|
|
* r1 --> to
|
|
*/
|
|
.globl 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
|
|
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
|
|
|
|
/*
|
|
* void rt_hw_context_switch_to(rt_uint32 to);
|
|
* r0 --> to
|
|
*/
|
|
.globl 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!, {r4} @ pop new task cpsr
|
|
msr cpsr_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);
|
|
*/
|
|
.globl rt_thread_switch_interrupt_flag
|
|
.globl rt_interrupt_from_thread
|
|
.globl rt_interrupt_to_thread
|
|
.globl 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 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]
|
|
mov pc, lr
|