2013-11-07 11:34:23 +08:00
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/*
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* File : context_gcc.S
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006-2011, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2011-02-14 aozima first implementation for Nios II.
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* 2011-02-20 aozima fix context&switch bug.
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*/
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/**
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* @addtogroup NIOS_II
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*/
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/*@{*/
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.text
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.set noat
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/*
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* rt_base_t rt_hw_interrupt_disable();
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*/
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.global rt_hw_interrupt_disable
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.type rt_hw_interrupt_disable, %function
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rt_hw_interrupt_disable:
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rdctl r2, status /* return status */
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wrctl status, zero /* disable interrupt */
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ret
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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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.global rt_hw_interrupt_enable
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.type rt_hw_interrupt_enable, %function
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rt_hw_interrupt_enable:
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wrctl status, r4 /* enable interrupt by argument */
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ret
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/* void rt_hw_context_switch_interrupt_do(void) */
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.global rt_hw_context_switch_interrupt_do
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.type rt_hw_context_switch_interrupt_do, %function
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rt_hw_context_switch_interrupt_do:
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/* save from thread */
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addi sp,sp,-72
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/* frist save r2,so that save status */
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stw r2, 4(sp)
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/* save status */
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/* when the interrupt happen,the interrupt is enable */
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movi r2, 1
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stw r2, 68(sp) /* status */
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stw r3, 8(sp)
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stw r4, 12(sp)
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/* get & save from thread pc */
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ldw r4,%gprel(rt_current_thread_entry)(gp)
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stw r4, 0(sp) /* thread pc */
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stw r5, 16(sp)
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stw r6, 20(sp)
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stw r7, 24(sp)
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stw r16, 28(sp)
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stw r17, 32(sp)
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stw r18, 36(sp)
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stw r19, 40(sp)
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stw r20, 44(sp)
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stw r21, 48(sp)
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stw r22, 52(sp)
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stw r23, 56(sp)
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stw fp, 60(sp)
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stw ra, 64(sp)
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/* save from thread sp */
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/* rt_interrupt_from_thread = &from_thread->sp */
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ldw r4, %gprel(rt_interrupt_from_thread)(gp)
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/* *r4(from_thread->sp) = sp */
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stw sp, (r4)
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/* clear rt_thread_switch_interrupt_flag */
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/* rt_thread_switch_interrupt_flag = 0 */
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stw zero,%gprel(rt_thread_switch_interrupt_flag)(gp)
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/* load to thread sp */
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/* r4 = rt_interrupt_to_thread(&to_thread->sp) */
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ldw r4, %gprel(rt_interrupt_to_thread)(gp)
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/* sp = to_thread->sp */
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ldw sp, (r4)
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ldw r2, 68(sp) /* status */
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wrctl estatus, r2
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ldw ea, 0(sp) /* thread pc */
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ldw r2, 4(sp)
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ldw r3, 8(sp)
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ldw r4, 12(sp)
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ldw r5, 16(sp)
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ldw r6, 20(sp)
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ldw r7, 24(sp)
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ldw r16, 28(sp)
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ldw r17, 32(sp)
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ldw r18, 36(sp)
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ldw r19, 40(sp)
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ldw r20, 44(sp)
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ldw r21, 48(sp)
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ldw r22, 52(sp)
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ldw r23, 56(sp)
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ldw fp, 60(sp)
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ldw ra, 64(sp)
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addi sp, sp, 72
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/* estatus --> status,ea --> pc */
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eret
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/*
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* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
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* r4: from
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* r5: to
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*/
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.global rt_hw_context_switch
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.type rt_hw_context_switch, %function
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rt_hw_context_switch:
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/* save from thread */
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addi sp,sp,-72
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/* frist save r2,so that save status */
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stw r2, 4(sp)
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/* save status */
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rdctl r2, status
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stw r2, 68(sp) /* status */
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stw ra, 0(sp) /* return from rt_hw_context_switch */
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stw r3, 8(sp)
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stw r4, 12(sp)
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stw r5, 16(sp)
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stw r6, 20(sp)
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stw r7, 24(sp)
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stw r16, 28(sp)
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stw r17, 32(sp)
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stw r18, 36(sp)
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stw r19, 40(sp)
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stw r20, 44(sp)
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stw r21, 48(sp)
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stw r22, 52(sp)
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stw r23, 56(sp)
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stw fp, 60(sp)
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stw ra, 64(sp)
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/* save form thread sp */
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/* from_thread->sp(r4) = sp */
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stw sp, (r4)
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/* update rt_interrupt_from_thread */
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/* rt_interrupt_from_thread = r4(from_thread->sp) */
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stw r4,%gprel(rt_interrupt_from_thread)(gp)
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/* update rt_interrupt_to_thread */
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/* rt_interrupt_to_thread = r5 */
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stw r5,%gprel(rt_interrupt_to_thread)(gp)
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/* get to thread sp */
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/* sp = rt_interrupt_to_thread(r5:to_thread->sp) */
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ldw sp, (r5)
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ldw r2, 68(sp) /* status */
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wrctl estatus, r2
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ldw ea, 0(sp) /* thread pc */
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ldw r2, 4(sp)
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ldw r3, 8(sp)
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ldw r4, 12(sp)
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ldw r5, 16(sp)
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ldw r6, 20(sp)
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ldw r7, 24(sp)
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ldw r16, 28(sp)
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ldw r17, 32(sp)
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ldw r18, 36(sp)
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ldw r19, 40(sp)
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ldw r20, 44(sp)
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ldw r21, 48(sp)
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ldw r22, 52(sp)
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ldw r23, 56(sp)
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ldw fp, 60(sp)
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ldw ra, 64(sp)
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addi sp, sp, 72
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/* estatus --> status,ea --> pc */
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eret
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/*
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* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
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* r4: from
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* r5: to
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*/
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.global rt_hw_context_switch_interrupt
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.type rt_hw_context_switch_interrupt, %function
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rt_hw_context_switch_interrupt:
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/* if( rt_thread_switch_interrupt_flag != 0 ) _from_thread_not_change */
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ldw r2,%gprel(rt_thread_switch_interrupt_flag)(gp)
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bne r2,zero,_from_thread_not_change
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_from_thread_change:
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/* save ea -> rt_current_thread_entry */
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addi ea,ea,-4
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stw ea,%gprel(rt_current_thread_entry)(gp)
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/* set rt_thread_switch_interrupt_flag to 1 */
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movi r2, 1
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stw r2,%gprel(rt_thread_switch_interrupt_flag)(gp)
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/* update rt_interrupt_from_thread */
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stw r4,%gprel(rt_interrupt_from_thread)(gp)
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_from_thread_not_change:
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/* update rt_interrupt_to_thread */
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stw r5,%gprel(rt_interrupt_to_thread)(gp)
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ret
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/*
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* void rt_hw_context_switch_to(rt_uint32 to);
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* r4: to
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*/
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.global rt_hw_context_switch_to
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.type rt_hw_context_switch_to, %function
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rt_hw_context_switch_to:
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/* save to thread */
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stw r4,%gprel(rt_interrupt_to_thread)(gp)
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/* get sp */
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ldw sp, (r4) // sp = *r4
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ldw r2, 68(sp) /* status */
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wrctl estatus, r2
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ldw ea, 0(sp) /* thread entry */
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ldw r2, 4(sp)
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ldw r3, 8(sp)
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ldw r4, 12(sp)
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ldw r5, 16(sp)
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ldw r6, 20(sp)
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ldw r7, 24(sp)
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ldw r16, 28(sp)
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ldw r17, 32(sp)
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ldw r18, 36(sp)
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ldw r19, 40(sp)
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ldw r20, 44(sp)
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ldw r21, 48(sp)
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ldw r22, 52(sp)
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ldw r23, 56(sp)
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ldw fp, 60(sp)
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ldw ra, 64(sp)
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addi sp, sp, 72
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/* estatus --> status,ea --> pc */
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eret
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/*@}*/
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