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/* Project:     OSLib

 * Description: The OS Construction Kit

 * Date:                1.6.2000

 * Idea by:             Luca Abeni & Gerardo Lamastra

 *

 * OSLib is an SO project aimed at developing a common, easy-to-use

 * low-level infrastructure for developing OS kernels and Embedded

 * Applications; it partially derives from the HARTIK project but it

 * currently is independently developed.

 *

 * OSLib is distributed under GPL License, and some of its code has

 * been derived from the Linux kernel source; also some important

 * ideas come from studying the DJGPP go32 extender.

 *

 * We acknowledge the Linux Community, Free Software Foundation,

 * D.J. Delorie and all the other developers who believe in the

 * freedom of software and ideas.

 *

 * For legalese, check out the included GPL license.

 */

/*      Address Spaces test file                        */

#include <ll/i386/stdlib.h>

#include <ll/i386/error.h>

#include <ll/i386/mem.h>

#include <ll/i386/hw-arch.h>

#include <ll/i386/farptr.h>

#include <ll/sys/ll/ll-func.h>

#include <ll/sys/ll/aspace.h>

#include <ll/sys/ll/event.h>

#include <ll/string.h>

#define USE_NEW_HANDLERS

#define T  1000

#define WAIT()  for (w = 0; w < 0x5FFFFF; w++)                                 

extern DWORD GDT_base;

extern void int0x31(void);

#ifndef USE_NEW_HANDLERS

struct regs {

  DWORD flags;

  DWORD egs;

  DWORD efs;

  DWORD ees;

  DWORD eds;

  DWORD edi;

  DWORD esi;

  DWORD ebp;

  DWORD esp;

  DWORD ebx;

  DWORD edx;

  DWORD ecx;

  DWORD eax;

};

#endif

BYTE space[2048];

WORD th1, th2, thm;

char outstring[] = "Hi there!!!\n";

#ifdef USE_NEW_HANDLERS

void chandler(DWORD intnum, struct registers r)

#else

void chandler(struct regs r, DWORD intnum)

#endif

{

  message("[System Call] EAX = 0x%lx EBX = 0x%lx ECX = 0x%lx...\n",

                  r.eax, r.ebx, r.ecx);

  if (r.eax == 1) {

    message("Exit!!!\n");

    ll_context_load(thm);

  }

  if (r.eax == 2) {

    char string[20];

    DWORD p;

    unsigned int size;

    p = GDT_read(r.eds, NULL, NULL, NULL);

    p += r.ebx;

    size = r.ecx;

    if (size > 20) {

      size = 20;

    }

#if 0

    message("Buffer @0x%lx, len %u\n", p, size);

    l1_end();

    sti();

    l1_exit(0);

#endif

    memcpy(string, (void *)p, size);

    string[19] = 0;

    message("Write...\n");

    message("%s", string);

    return;

  }

  message("Unsupported System Call!!!\n");

}

/* For now, this is not called */

void killer(void)

{

  cli();

  message("Killer!!!\n");

  ll_context_load(thm);

}

/*

  And this is the thread that runs in the new AS... It cannot call

  any function (it is alone in its AS), so it simply plots a star

  on the screen and loops waiting for an event that switches to the

  main thread.

*/

void nullfun(void *p)

{

  /* Some asm to write on the screen (we cannot use libc... it is not

     linked in this AS */

  __asm__ __volatile__ ("movl $2, %eax");

  __asm__ __volatile__ ("movl $1000, %ebx");

  __asm__ __volatile__ ("movl $16, %ecx");

  __asm__ __volatile__ ("int $0x31");

  __asm__ __volatile__ ("movl $1, %eax");

  __asm__ __volatile__ ("int $0x31");

  /* should not arrive here... */

  for(;;);

  halt();

}

int main (int argc, char *argv[])

{

  DWORD sp1, sp2;

  void *res;

  AS as, ds;

  int ok;

  sp1 = get_SP();

  cli();

  res = ll_init();

  if (res == NULL) {

    message("Error in LowLevel initialization code...\n");

    sti();

    l1_exit(-1);

  }

  message("LowLevel started...\n");

#ifdef USE_NEW_HANDLERS

  l1_int_bind(0x31, chandler);

#else

  IDT_place(0x31, int0x31);

#endif

  as_init();

  message("Creating an Address Space\n");

  as = as_create();

  message("Created: ID = %d %x\n", as, as);

  message("Binding array @ 0x%lx\n", (DWORD)space);

  ok = as_bind(as, (DWORD)space, 0, sizeof(space));

  if (ok < 0) {

    message("Error in as_bind!!!\n");

  } else {

    message("Bound\n");

  }

  ds = get_DS();

  /* Let's create the image of the process...

   * 0 --> 1000 : text

   * 1000 --> 1000 + strlen(outstring) : initialized data

   * ? <-- 2048 : stack

   */

  fmemcpy(as, 0, ds, (DWORD)nullfun, 1000);

  fmemcpy(as, 1000, ds, (DWORD)outstring, strlen(outstring));

  /* Create a thread (in our AS) and a task (in a different AS) */

  th1 = ll_context_create(0, (void *)2048, NULL,killer, 0);

  ll_context_setspace(th1, as);

  /* Save our context, in order to permit to switch back to main */

  thm = ll_context_save();

  message("I am thread %x\n", thm);

  message("Thread 1 created\n");

  message("Switching to it...\n");

  ll_context_load(th1);

  message("Back to Main\n");

  cli();

  ll_end();

  sp2 = get_SP();

  message("End reached!\n");

  message("Actual stack : %lx - ", sp2);

  message("Begin stack : %lx\n", sp1);

  message("Check if same : %s\n",sp1 == sp2 ? "Ok :-)" : "No :-(");

  return 1;

}