/*****************************************************************************************
Copyright (c) 2002-2004 The UbixOS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors. Redistributions in binary
form must reproduce the above copyright notice, this list of conditions, the following
disclaimer and the list of authors in the documentation and/or other materials provided
with the distribution. Neither the name of the UbixOS Project nor the names of its
contributors may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$Id$
*****************************************************************************************/
#include <ubixos/fork.h>
#include <ubixos/types.h>
#include <ubixos/sched.h>
#include <ubixos/vitals.h>
#include <ubixos/tty.h>
#include <vmm/vmm.h>
#include <string.h>
#include <assert.h>
/************************************************************************
Function: void sysFork();
Description: This Function Forks A Task
Notes:
08/01/02 - This Seems To Be Working Fine However I'm Not Sure If I
Chose The Best Path To Impliment It I Guess We Will See
What The Future May Bring
************************************************************************/
asm(
".globl sysFork \n"
"sysFork: \n"
" xor %eax,%eax \n"
" call schedNewTask \n"
" testl %eax,%eax \n"
" je 1f \n"
" pushl %esi \n"
" pushl %edi \n"
" pushl %ebp \n"
" pushl %eax \n"
" call forkCopyProcess \n"
" movl %eax,(%ebx) \n"
" addl $16,%esp \n"
"1: \n"
" ret \n"
);
int forkCopyProcess(struct taskStruct *newProcess,long ebp,long edi,long esi,long none,long ebx,long ecx,long edx,long eip,long cs,long eflags,long esp,long ss) {
assert(newProcess);
assert(_current);
/* Set Up New Tasks Information */
newProcess->tss.eip = eip;
sprintf(newProcess->oInfo.cwd,_current->oInfo.cwd);
newProcess->oInfo.vmStart = _current->oInfo.vmStart;
newProcess->term = _current->term;
newProcess->term->owner = newProcess->id;
newProcess->uid = _current->uid;
newProcess->gid = _current->gid;
newProcess->tss.back_link = 0x0;
newProcess->tss.esp0 = _current->tss.esp0;
newProcess->tss.ss0 = 0x10;
newProcess->tss.esp1 = 0x0;
newProcess->tss.ss1 = 0x0;
newProcess->tss.esp2 = 0x0;
newProcess->tss.ss2 = 0x0;
newProcess->tss.eflags = eflags;
newProcess->tss.eax = 0x0;
newProcess->tss.ebx = ebx;
newProcess->tss.ecx = ecx;
newProcess->tss.edx = edx;
newProcess->tss.esi = esi;
newProcess->tss.edi = edi;
newProcess->tss.ebp = ebp;
newProcess->tss.esp = esp;
newProcess->tss.cs = cs & 0xFF;
newProcess->tss.ss = ss & 0xFF;
newProcess->tss.ds = _current->tss.ds & 0xFF;
newProcess->tss.fs = _current->tss.fs & 0xFF;
newProcess->tss.gs = _current->tss.gs & 0xFF;
newProcess->tss.es = _current->tss.es & 0xFF;
newProcess->tss.ldt = 0x18;
newProcess->tss.trace_bitmap = 0x0000;
newProcess->tss.io_map = 0x8000;
/* Create A Copy Of The VM Space For New Task */
newProcess->tss.cr3 = (uInt32)vmmCopyVirtualSpace(newProcess->id);
newProcess->state = FORK;
while (newProcess->state == FORK);
/* Return Id of Proccess */
return(newProcess->id);
}
/***
$Log$
Revision 1.22 2004/08/09 12:58:05 reddawg
let me know when you got the surce
Revision 1.21 2004/08/06 22:32:16 reddawg
Ubix Works Again
Revision 1.19 2004/08/04 08:17:57 reddawg
tty: we have primative ttys try f1-f5 so it is easier to use and debug
ubixos
Revision 1.18 2004/08/02 18:50:13 reddawg
Updates to make some variable volatile to make work with gcc 3.3. However there are still some issues but we have not caused new issues with gcc 2.95
Revision 1.17 2004/07/29 21:32:16 reddawg
My quick lunchs breaks worth of updates....
Revision 1.16 2004/07/28 00:17:05 reddawg
Major:
Disconnected page 0x0 from the system... Unfortunately this broke many things
all of which have been fixed. This was good because nothing deferences NULL
any more.
Things affected:
malloc,kmalloc,getfreepage,getfreevirtualpage,pagefault,fork,exec,ld,ld.so,exec,file
Revision 1.15 2004/07/25 06:04:00 reddawg
Last of my fixes for the morning
Revision 1.14 2004/07/24 20:00:51 reddawg
Lots of changes to the vmm subsystem.... Page faults have been adjust to now be blocking on a per thread basis not system wide. This has resulted in no more deadlocks.. also the addition of per thread locking has removed segfaults as a result of COW in which two tasks fault the same COW page and try to modify it.
Revision 1.13 2004/07/21 17:11:18 reddawg
A Quick tweak I'm going to clean up some unused variables in sched.h
Revision 1.12 2004/07/20 22:29:55 reddawg
assert: remade assert
Revision 1.11 2004/07/19 01:56:01 reddawg
fork: no mem leaks here
Revision 1.10 2004/07/18 05:24:15 reddawg
Fixens
Revision 1.9 2004/07/18 03:01:44 reddawg
Few changes to spinlock hopefully it will cure our deadlock
Revision 1.8 2004/07/17 03:32:22 reddawg
assert()
Revision 1.7 2004/07/17 03:10:18 reddawg
Added asserts no problems thusfar
Revision 1.6 2004/06/26 01:24:44 reddawg
Fixens
Revision 1.5 2004/06/15 12:24:07 reddawg
Cleaned Up
Revision 1.4 2004/06/10 13:08:00 reddawg
Minor Bug Fixes
Revision 1.3 2004/05/19 14:32:06 reddawg
Cleaned up some warning from leaving out typedefs
Revision 1.2 2004/05/15 02:30:28 reddawg
Lots of changes
END
***/
