147 lines
3.3 KiB
ArmAsm
147 lines
3.3 KiB
ArmAsm
/*
|
|
* File : context_gcc.S
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2010-05-17 swkyer first version
|
|
* 2010-09-11 bernard port to Jz4755
|
|
*/
|
|
#include "../common/mips.inc"
|
|
#include "../common/stackframe.h"
|
|
#include "stack.h"
|
|
|
|
.section ".text", "ax"
|
|
.set noreorder
|
|
|
|
/*
|
|
* rt_base_t rt_hw_interrupt_disable()
|
|
*/
|
|
.globl rt_hw_interrupt_disable
|
|
rt_hw_interrupt_disable:
|
|
mfc0 v0, CP0_STATUS
|
|
and v1, v0, 0xfffffffe
|
|
mtc0 v1, CP0_STATUS
|
|
jr ra
|
|
nop
|
|
|
|
/*
|
|
* void rt_hw_interrupt_enable(rt_base_t level)
|
|
*/
|
|
.globl rt_hw_interrupt_enable
|
|
rt_hw_interrupt_enable:
|
|
mtc0 a0, CP0_STATUS
|
|
jr ra
|
|
nop
|
|
|
|
/*
|
|
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)
|
|
* a0 --> from
|
|
* a1 --> to
|
|
*/
|
|
.globl rt_hw_context_switch
|
|
rt_hw_context_switch:
|
|
mtc0 ra, CP0_EPC
|
|
SAVE_ALL
|
|
|
|
sw sp, 0(a0) /* store sp in preempted tasks TCB */
|
|
lw sp, 0(a1) /* get new task stack pointer */
|
|
|
|
RESTORE_ALL_AND_RET
|
|
|
|
/*
|
|
* void rt_hw_context_switch_to(rt_uint32 to)/*
|
|
* a0 --> to
|
|
*/
|
|
.globl rt_hw_context_switch_to
|
|
rt_hw_context_switch_to:
|
|
lw sp, 0(a0) /* get new task stack pointer */
|
|
|
|
RESTORE_ALL_AND_RET
|
|
|
|
/*
|
|
* 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:
|
|
la t0, rt_thread_switch_interrupt_flag
|
|
lw t1, 0(t0)
|
|
nop
|
|
bnez t1, _reswitch
|
|
nop
|
|
li t1, 0x01 /* set rt_thread_switch_interrupt_flag to 1 */
|
|
sw t1, 0(t0)
|
|
la t0, rt_interrupt_from_thread /* set rt_interrupt_from_thread */
|
|
sw a0, 0(t0)
|
|
_reswitch:
|
|
la t0, rt_interrupt_to_thread /* set rt_interrupt_to_thread */
|
|
sw a1, 0(t0)
|
|
jr ra
|
|
nop
|
|
|
|
.globl system_dump
|
|
|
|
/*
|
|
* void rt_hw_context_switch_interrupt_do(rt_base_t flag)
|
|
*/
|
|
.globl rt_interrupt_enter
|
|
.globl rt_interrupt_leave
|
|
.globl mips_irq_handle
|
|
mips_irq_handle:
|
|
SAVE_ALL
|
|
|
|
mfc0 t0, CP0_CAUSE
|
|
mfc0 t1, CP0_STATUS
|
|
and t0, t1
|
|
|
|
andi t0, 0xff00
|
|
beqz t0, spurious_interrupt
|
|
nop
|
|
|
|
/* let k0 keep the current context sp */
|
|
move k0, sp
|
|
/* switch to kernel stack */
|
|
li sp, SYSTEM_STACK
|
|
|
|
jal rt_interrupt_enter
|
|
nop
|
|
jal rt_interrupt_dispatch
|
|
nop
|
|
jal rt_interrupt_leave
|
|
nop
|
|
|
|
/* switch sp back to thread's context */
|
|
move sp, k0
|
|
|
|
/*
|
|
* if rt_thread_switch_interrupt_flag set, jump to
|
|
* rt_hw_context_switch_interrupt_do and don't return
|
|
*/
|
|
la k0, rt_thread_switch_interrupt_flag
|
|
lw k1, 0(k0)
|
|
beqz k1, spurious_interrupt
|
|
nop
|
|
sw zero, 0(k0) /* clear flag */
|
|
nop
|
|
|
|
/*
|
|
* switch to the new thread
|
|
*/
|
|
la k0, rt_interrupt_from_thread
|
|
lw k1, 0(k0)
|
|
nop
|
|
sw sp, 0(k1) /* store sp in preempted tasks's TCB */
|
|
|
|
la k0, rt_interrupt_to_thread
|
|
lw k1, 0(k0)
|
|
nop
|
|
lw sp, 0(k1) /* get new task's stack pointer */
|
|
j spurious_interrupt
|
|
nop
|
|
|
|
spurious_interrupt:
|
|
RESTORE_ALL_AND_RET
|
|
|
|
.set reorder
|