/**************************************************************************************
 Copyright (c) 2002 The UbixOS Project
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification,
 are prohibited.

 $Id$

**************************************************************************************/

#include <ubixos/exec.h>
#include <ubixos/schedule.h>
#include <ubixos/elf.h>
#include <ubixos/a.out.h>
#include <vmm/paging.h>
#include <ubixfs/file.h>

int execFile(char *file) {
  int fd=0,i=0,x=0,eStart=0;
  char *binarySpace = (char *)0x7C0000;
  char *newLoc;
  elfHeader *binaryHeader = (elfHeader *)0x7C0000;
  elfProgramheader *programHeader;
  fd = fopen(file,1);
  for (i=0;feof(fd) == 0;i++) {
    binarySpace[i] = fgetc(fd);
    }
   programHeader = (elfProgramheader *)(0x7C0000 + binaryHeader->ePhoff);
  newLoc = (char *)programHeader->phVaddr;
  for (x=0;x<i;x++) {
    newLoc[x] = binarySpace[x];
    }
  eStart = binaryHeader->eEntry;
  execThread((void *)eStart,0xBFFF,file);
  return(0);
  }

void execThread(void (* tproc)(void),int stack,char *descr) {
  int pid = 0;
  pid = findTask();
  taskList[pid].tss.back_link    = 0x0;
  taskList[pid].tss.esp0         = stack;
  taskList[pid].tss.ss0          = 0x10;
  taskList[pid].tss.esp1         = 0x0;
  taskList[pid].tss.ss1          = 0x10;
  taskList[pid].tss.esp2         = 0x0;
  taskList[pid].tss.ss2          = 0x10;
  taskList[pid].tss.cr3          = (unsigned int)pageDirectory;
  taskList[pid].tss.eip          = (unsigned int)tproc;
  taskList[pid].tss.eflags       = 0x206;
  taskList[pid].tss.esp          = stack;
  taskList[pid].tss.ebp          = stack;
  taskList[pid].tss.esi          = 0x0;
  taskList[pid].tss.edi          = 0x0;
  taskList[pid].tss.es           = 0x10;
  taskList[pid].tss.cs           = 0x08;
  taskList[pid].tss.ss           = 0x10;
  taskList[pid].tss.ds           = 0x10;
  taskList[pid].tss.fs           = 0x10;
  taskList[pid].tss.gs           = 0x10;
  taskList[pid].tss.ldt          = 0x18;
  taskList[pid].tss.trace_bitmap = 0x80000000;
  taskList[pid].status = RUNABLE;
  }