kernel2/vm86.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <procm.h>
  20 #include <string.h>
  21 #include <gdt.h>
  22 #include <memkernel.h>
  23 #include <llist.h>
  24
  25 proc_t *vm86_proc_create(const char *name,uid_t uid,gid_t gid,proc_t *parent) {
  26   proc_t *new = malloc(sizeof(proc_t));
  27
  28   new->pid = proc_nextpid++;
  29   new->uid = uid;
  30   new->euid = uid;
  31   new->suid = uid;
  32   new->gid = gid;
  33   new->egid = gid;
  34   new->sgid = gid;
  35   new->name = strdup(name);
  36   new->parent = parent;
  37   if (parent!=NULL) llist_push(parent->children,new);
  38   new->children = llist_create();
  39   memset(&(new->registers),0,sizeof(new->registers));
  40   new->registers.efl = 0x20202;
  41   new->registers.cs = IDX2SEL(3,PRIV_USER);
  42   new->registers.ds = IDX2SEL(4,PRIV_USER);
  43   new->registers.es = IDX2SEL(4,PRIV_USER);
  44   new->registers.fs = IDX2SEL(4,PRIV_USER);
  45   new->registers.gs = IDX2SEL(4,PRIV_USER);
  46   new->registers.ss = IDX2SEL(4,PRIV_USER);
  47   new->addrspace = NULL;
  48   new->vm86_pagedir = NULL;
  49   new->nice = 0;
  50   new->ticks_rem = NICE2TICKS(new->nice);
  51   new->var = -1;
  52   new->defunc = 0;
  53   new->is_sleeping = 0;
  54   new->signal = NULL;
  55   new->is_vm86 = 1;
  56
  57   //llist_push(proc_all,new);
  58   //llist_push(proc_running,new);
  59   return new;
  60 }
  61
  62 void vm86_save_segregs(proc_t *proc) {
  63   proc->vm86_segregs.es = *vm86_curregs.es;
  64   proc->vm86_segregs.ds = *vm86_curregs.ds;
  65   proc->vm86_segregs.fs = *vm86_curregs.fs;
  66   proc->vm86_segregs.gs = *vm86_curregs.gs;
  67 }
  68
  69 void vm86_load_segregs(proc_t *proc) {
  70   *vm86_curregs.es = proc->vm86_segregs.es;
  71   *vm86_curregs.ds = proc->vm86_segregs.ds;
  72   *vm86_curregs.fs = proc->vm86_segregs.fs;
  73   *vm86_curregs.gs = proc->vm86_segregs.gs;
  74 }