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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2011-12-17 nl1031 first implementation for MicroBlaze.
*/
#include "microblaze.inc"
.text
.globl rt_interrupt_enter
.globl rt_interrupt_leave
/*
* rt_base_t rt_hw_interrupt_disable()
* copy from ucos-ii
*/
.globl rt_hw_interrupt_disable
.ent rt_hw_interrupt_disable
.align 2
rt_hw_interrupt_disable:
ADDIK r1, r1, -4
SW r4, r1, r0
MFS r3, RMSR
ANDNI r4, r3, IE_BIT
MTS RMSR, r4
LW r4, r1, r0
ADDIK r1, r1, 4
AND r0, r0, r0 /* NO-OP - pipeline flush */
AND r0, r0, r0 /* NO-OP - pipeline flush */
AND r0, r0, r0 /* NO-OP - pipeline flush */
RTSD r15, 8
AND r0, r0, r0
.end rt_hw_interrupt_disable
/*
* void rt_hw_interrupt_enable(rt_base_t level)
* copy from ucos-ii
*/
.globl rt_hw_interrupt_enable
.ent rt_hw_interrupt_enable
.align 2
rt_hw_interrupt_enable:
RTSD r15, 8
MTS rMSR, r5 /* Move the saved status from r5 into rMSR */
.end rt_hw_interrupt_enable
/*
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)
* r5 --> from
* r6 --> to
*/
.globl rt_interrupt_from_thread
.globl rt_interrupt_to_thread
.globl rt_hw_context_switch
.ent rt_hw_context_switch
.align 2
rt_hw_context_switch:
PUSH_ALL
MFS r3, RMSR /* save the MSR */
SWI r3, r1, STACK_RMSR
SWI r1, r5, 0 /* store sp in preempted tasks TCB */
LWI r1, r6, 0 /* get new task stack pointer */
LWI r3, r1, STACK_RMSR
ANDI r3, r3, IE_BIT
BNEI r3, rt_hw_context_switch_ie /*if IE bit set,should be use RTID (return from interrupt). */
LWI r3, r1, STACK_RMSR
MTS RMSR,r3
POP_ALL
ADDIK r1, r1, STACK_SIZE
RTSD r15, 8
AND r0, r0, r0
rt_hw_context_switch_ie:
LWI r3, r1, STACK_RMSR
ANDNI r3, r3, IE_BIT /* clear IE bit, prevent interrupt occur immediately*/
MTS RMSR,r3
LWI r3, r1, STACK_R03
POP_ALL
ADDIK r1, r1, STACK_SIZE
RTID r14, 0 /* IE bit will be set automatically */
AND r0, r0, r0
.end rt_hw_context_switch
/*
* void rt_hw_context_switch_to(rt_uint32 to)
* r5 --> to
*/
.globl rt_hw_context_switch_to
.ent rt_hw_context_switch_to
.align 2
rt_hw_context_switch_to:
LWI r1, r5, 0 /* get new task stack pointer */
LWI r3, r1, STACK_RMSR
ANDNI r3, r3, IE_BIT /* clear IE bit, prevent interrupt occur immediately*/
MTS RMSR,r3
POP_ALL
ADDIK r1, r1, STACK_SIZE
RTID r14, 0 /* IE bit will be set automatically */
AND r0, r0, r0
.end rt_hw_context_switch_to
/*
* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)
*/
.globl rt_thread_switch_interrupt_flag
.globl rt_hw_context_switch_interrupt
.ent rt_hw_context_switch_interrupt
.align 2
rt_hw_context_switch_interrupt:
LA r3, r0, rt_thread_switch_interrupt_flag
LWI r4, r3, 0 /* load rt_thread_switch_interrupt_flag into r4 */
ANDI r4, r4, 1
BNEI r4, _reswitch /* if rt_thread_switch_interrupt_flag = 1 */
ADDIK r4, r0, 1 /* set rt_thread_switch_interrupt_flag to 1 */
SWI r4, r3, 0
LA r3, r0, rt_interrupt_from_thread /* set rt_interrupt_from_thread */
SWI r5, r3, 0 /* rt_interrupt_from_thread = from */
_reswitch:
LA r3, r0, rt_interrupt_to_thread /* set rt_interrupt_to_thread */
SWI r6, r3, 0 /* rt_interrupt_to_thread = to */
RTSD r15, 8
AND r0, r0, r0
.end rt_hw_context_switch_interrupt
.globl _interrupt_handler
.section .text
.align 2
.ent _interrupt_handler
.type _interrupt_handler, @function
_interrupt_handler:
PUSH_ALL
MFS r3, RMSR
ORI r3, r3, IE_BIT
SWI r3, r1, STACK_RMSR /* push MSR */
BRLID r15, rt_interrupt_enter
AND r0, r0, r0
BRLID r15, rt_hw_trap_irq
AND r0, r0, r0
BRLID r15, rt_interrupt_leave
AND r0, r0, r0
/*
* if rt_thread_switch_interrupt_flag set, jump to
* rt_hw_context_switch_interrupt_do and don't return
*/
LA r3, r0, rt_thread_switch_interrupt_flag
LWI r4, r3, 0
ANDI r4, r4, 1
BNEI r4, rt_hw_context_switch_interrupt_do
LWI r3, r1, STACK_RMSR
ANDNI r3, r3, IE_BIT
MTS RMSR,r3
POP_ALL
ADDIK r1, r1, STACK_SIZE
RTID r14, 0
AND r0, r0, r0
/*
* void rt_hw_context_switch_interrupt_do(rt_base_t flag)
*/
rt_hw_context_switch_interrupt_do:
SWI r0, r3, 0 /* clear rt_thread_switch_interrupt_flag */
LA r3, r0, rt_interrupt_from_thread
LW r4, r0, r3
SWI r1, r4, 0 /* store sp in preempted tasks's TCB */
LA r3, r0, rt_interrupt_to_thread
LW r4, r0, r3
LWI r1, r4, 0 /* get new task's stack pointer */
LWI r3, r1, STACK_RMSR
ANDI r3, r3, IE_BIT
BNEI r3, return_with_ie /*if IE bit set,should be use RTID (return from interrupt). */
LWI r3, r1, STACK_RMSR
MTS RMSR,r3
POP_ALL
ADDIK r1, r1, STACK_SIZE
RTSD r15, 8
AND r0, r0, r0
return_with_ie:
LWI r3, r1, STACK_RMSR
ANDNI r3, r3, IE_BIT /* clear IE bit, prevent interrupt occur immediately*/
MTS RMSR,r3
LWI r3, r1, STACK_R03
POP_ALL
ADDIK r1, r1, STACK_SIZE
RTID r14, 0 /* IE bit will be set automatically */
AND r0, r0, r0
.end _interrupt_handler
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