context.c

强实时嵌入式系统开发 Rev1.00 网上下载所得

/*
===============================================================================
| COPYRIGHT (C) 2004-2006 Haishen Ruan, All rights reserved.
| SUMMARY:
|   Timer service.
|
|
| LICENSE INFORMATION
|   RS-RTOS is free software; you can redistribute it and/or modify it under
|   terms of the GNU General Public License as published by the
|   Free Software Foundation; either version 2, or (at your option) any
|   later version.
|
|   RS-RTOS 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 RS-RTOS; see file COPYING. If not, write to the Free Software
|   Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|   As a special exception, including RS-RTOS header files in a file,
|   instantiating RS-RTOS generics or templates, or linking other files
|   with RS-RTOS objects to produce an executable application, does not
|   by itself cause the resulting executable application to be covered
|   by the GNU General Public License. This exception does not
|   however invalidate any other reasons why the executable file might be
|   covered by the GNU Public License.
|
|
| DESCRIPTION:
|   See http://www.RS-RTOS.org for documentation, latest information, license
|   and contact details.
|   email:[e-mail]
=============================================================================*/
/*===========================================================================*/
#include "arch/arch.h"
#include "inc/const.h"
#include "inc/queue.h"
#include "inc/kernel.h"
#include "inc/memory.h"
#include "inc/ipc.h"


vect_t simuIRQ = 0;


void __declspec(naked) __switch_to(sp_t* cur_sp, sp_t next_sp)
{
    __asm {
        push    ebp
        mov     ebp, esp
        push    esi
        push    edi

        mov     eax, [cur_sp]
        mov     [eax], esp
        mov     esp, next_sp

        pop     edi
        pop     esi
        pop     ebp
        ret
    }
}


void __declspec(naked) __timer_handle(void)
{
    __asm {
        inc     _sched_lock     /* 首先要lock scheduler
                                   防止中断欠套产生任务切换*/
        pushfd
        pushad

        call    __do_tick

        mov     simuFL.b.IF, 0
        dec     _sched_lock     /* 所有该中断服务内容完成
                                   才能释放lock */

        call    far __schedule

        popad
        popfd
        ret
    }
}


void __declspec(naked) __interrupt_handle(void)
{
    __asm {
        inc     _sched_lock     /* 首先要lock scheduler
                                   防止中断欠套产生任务切换*/
        pushfd
        pushad
    }

    __interrupt_dispatch(simuIRQ);

    __asm {
        mov     simuFL.b.IF, 0
        dec     _sched_lock     /* 所有该中断服务内容完成
                                   才能释放lock */
        call    far __schedule

        popad
        popfd
        ret
    }
}


/*===========================================================================*/