segment.c

一款类linux的操作系统源码

/* 
 *  Roadrunner/pk
 *    Copyright (C) 1989-2001  Cornfed Systems, Inc.
 *
 *  The Roadrunner/pk operating system is free software; you can
 *  redistribute and/or modify it under the terms of the GNU General
 *  Public License, version 2, as published by the Free Software
 *  Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT 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 this program; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA 02111-1307 USA
 *
 *  More information about the Roadrunner/pk operating system of
 *  which this file is a part is available on the World-Wide Web
 *  at: http://www.cornfed.com.
 *
 */

#include <stdio.h>
#include <string.h>
#include <sys/config.h>
#include <sys/segment.h>
#include <sys/proc.h>
#include <sys/selector.h>

struct tss tsstab[PROCS];

/*
void
ktssinit(tss_t tss, u_long kstk, size_t kstksize)
{
    //2002年10月5日修改
    tss->d0 = 0;
    tss->d1 = 0;
    tss->d2 = 0;
    tss->d3 = 0;
    tss->d4 = 0;
    tss->d5 = 0;
    tss->d6 = 0;
    tss->d7 = 0;
    
    tss->a0 = 0;
    tss->a1 = 0;
    tss->a2 = 0;
    tss->a3 = 0;
    tss->a4 = 0;
    tss->a5 = 0;
    tss->a6 = 0;
    tss->pc = (u_long) proc_start;
    
    tss->usp = 0;
    tss->a7  = kstk + kstksize;
    tss->ssp = kstk + kstksize;
}
*/

void
tssinit(tss_t tss, u_long stk, size_t stksize)
{
    //2002年10月5日修改
    tss->ssp = stk + stksize - 4;

}




#if _DEBUG
/*
void
dumptss(tss_t tss)
{

    kprintf("ss0 %04x  esp0 %08x\n", (u_int) tss->ss0, (u_int) tss->esp0);
    kprintf("cr3 %08x  eip %08x  eflags %08x\n", (u_int) tss->cr3,
	    (u_int) tss->eip, (u_int) tss->eflags);
    kprintf("eax %08x  ebx %08x  ecx %08x  edx %08x\n",
	    (u_int) tss->eax, (u_int) tss->ebx, (u_int) tss->ecx,
	    (u_int) tss->edx);
    kprintf("esi %08x  edi %08x  esp %08x  ebp %08x\n",
	    (u_int) tss->esi, (u_int) tss->edi, (u_int) tss->esp,
	    (u_int) tss->ebp);
    kprintf("cs %04x  ss %04x  ds %04x  es %04x  fs %04x  gs %04x\n",
	    (u_int) tss->cs, (u_int) tss->ss, (u_int) tss->ds,
	    (u_int) tss->es, (u_int) tss->fs, (u_int) tss->gs);

}
*/
#endif