2013-01-08 21:05:02 +08:00
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/*
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* File : context_gcc.S
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* Change Logs:
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* Date Author Notes
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* 2010-05-17 swkyer first version
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* 2010-09-11 bernard port to Jz4755
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*/
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#include "../common/mips.inc"
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#include "../common/stackframe.h"
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#include "jz47xx.h"
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.section ".text", "ax"
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.set noreorder
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/*
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* rt_base_t rt_hw_interrupt_disable()
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*/
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.globl rt_hw_interrupt_disable
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rt_hw_interrupt_disable:
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mfc0 v0, CP0_STATUS
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and v1, v0, 0xfffffffe
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mtc0 v1, CP0_STATUS
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jr ra
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nop
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/*
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* void rt_hw_interrupt_enable(rt_base_t level)
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*/
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.globl rt_hw_interrupt_enable
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rt_hw_interrupt_enable:
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mtc0 a0, CP0_STATUS
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jr ra
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nop
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/*
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* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)
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* a0 --> from
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* a1 --> to
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*/
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.globl rt_hw_context_switch
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rt_hw_context_switch:
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mtc0 ra, CP0_EPC
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SAVE_ALL
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sw sp, 0(a0) /* store sp in preempted tasks TCB */
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lw sp, 0(a1) /* get new task stack pointer */
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RESTORE_ALL_AND_RET
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/*
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* void rt_hw_context_switch_to(rt_uint32 to)/*
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* a0 --> to
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*/
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.globl rt_hw_context_switch_to
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rt_hw_context_switch_to:
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lw sp, 0(a0) /* get new task stack pointer */
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RESTORE_ALL_AND_RET
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/*
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* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/*
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*/
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.globl rt_thread_switch_interrupt_flag
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.globl rt_interrupt_from_thread
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.globl rt_interrupt_to_thread
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.globl rt_hw_context_switch_interrupt
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rt_hw_context_switch_interrupt:
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la t0, rt_thread_switch_interrupt_flag
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lw t1, 0(t0)
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nop
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bnez t1, _reswitch
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nop
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li t1, 0x01 /* set rt_thread_switch_interrupt_flag to 1 */
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sw t1, 0(t0)
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la t0, rt_interrupt_from_thread /* set rt_interrupt_from_thread */
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sw a0, 0(t0)
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_reswitch:
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la t0, rt_interrupt_to_thread /* set rt_interrupt_to_thread */
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sw a1, 0(t0)
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jr ra
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nop
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.globl system_dump
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/*
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* void rt_hw_context_switch_interrupt_do(rt_base_t flag)
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*/
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.globl rt_interrupt_enter
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.globl rt_interrupt_leave
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.globl mips_irq_handle
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mips_irq_handle:
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SAVE_ALL
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mfc0 t0, CP0_CAUSE
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mfc0 t1, CP0_STATUS
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and t0, t1
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andi t0, 0xff00
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beqz t0, spurious_interrupt
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nop
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/* let k0 keep the current context sp */
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move k0, sp
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/* switch to kernel stack */
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li sp, SYSTEM_STACK
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jal rt_interrupt_enter
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nop
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jal rt_interrupt_dispatch
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nop
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jal rt_interrupt_leave
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nop
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/* switch sp back to thread's context */
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move sp, k0
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/*
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* if rt_thread_switch_interrupt_flag set, jump to
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* rt_hw_context_switch_interrupt_do and don't return
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*/
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la k0, rt_thread_switch_interrupt_flag
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lw k1, 0(k0)
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beqz k1, spurious_interrupt
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nop
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sw zero, 0(k0) /* clear flag */
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nop
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/*
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* switch to the new thread
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*/
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la k0, rt_interrupt_from_thread
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lw k1, 0(k0)
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nop
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sw sp, 0(k1) /* store sp in preempted tasks's TCB */
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la k0, rt_interrupt_to_thread
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lw k1, 0(k0)
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nop
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lw sp, 0(k1) /* get new task's stack pointer */
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j spurious_interrupt
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nop
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spurious_interrupt:
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RESTORE_ALL_AND_RET
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.set reorder
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