e820test.c

Windows上的精简Linux系统

#ident "$Id: e820test.c,v 1.6 2003/11/18 19:20:20 hpa Exp $"
/* ----------------------------------------------------------------------- *
 *   
 *   Copyright 2001-2003 H. Peter Anvin - All Rights Reserved
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
 *   Bostom MA 02111-1307, USA; either version 2 of the License, or
 *   (at your option) any later version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

/*
 * e820hack.c
 *
 * Test of INT 15:E820 canonicalization/manipulation routine
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include "e820.h"

void *sys_bounce;		/* Dummy */

extern void parse_mem(void);
extern uint32_t dos_mem, low_mem, high_mem;

void __attribute__((noreturn)) die(void)
{
  abort();
}

void printranges(void) {
  int i;

  for ( i = 0 ; i < nranges ; i++ ) {
    printf("%016llx %016llx %d\n",
	   ranges[i].start,
	   ranges[i+1].start - ranges[i].start,
	   ranges[i].type);
  }
}

int main(int argc, char *argv[])
{
  uint64_t start, len;
  uint32_t type;
  char line[BUFSIZ], *p;

  e820map_init();
  printranges();

  while ( fgets(line, BUFSIZ, stdin) ) {
    p = strchr(line, ':');
    p = p ? p+1 : line;
    if ( sscanf(p, " %llx %llx %d", &start, &len, &type) == 3 ) {
      putchar('\n'); 
      printf("%016llx %016llx %d <-\n", start, len, type);
      putchar('\n'); 
      insertrange(start, len, type);
      printranges(); 
    }
  }

  parse_mem();

  putchar('\n');
  printf("DOS  mem = %#10x (%u K)\n", dos_mem, dos_mem >> 10);
  printf("Low  mem = %#10x (%u K)\n", low_mem, low_mem >> 10);
  printf("High mem = %#10x (%u K)\n", high_mem, high_mem >> 10);
  putchar('\n');

  /* Now, steal a chunk (2K) of DOS memory and make sure it registered OK */
  insertrange(dos_mem-2048, 2048, 2); /* Type 2 = reserved */
  
  printranges();
  parse_mem();

  putchar('\n');
  printf("DOS  mem = %#10x (%u K)\n", dos_mem, dos_mem >> 10);
  printf("Low  mem = %#10x (%u K)\n", low_mem, low_mem >> 10);
  printf("High mem = %#10x (%u K)\n", high_mem, high_mem >> 10);
  putchar('\n');

  return 0;
}