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path: root/com32/modules/meminfo.c
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/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2008 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., 51 Franklin St, Fifth Floor,
 *   Boston MA 02110-1301, USA; either version 2 of the License, or
 *   (at your option) any later version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

/*
 * meminfo.c
 *
 * Dump the memory map of the system
 */
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <console.h>
#include <com32.h>

struct e820_data {
  uint64_t base;
  uint64_t len;
  uint32_t type;
  uint32_t extattr;
} __attribute__((packed));

static const char * const e820_types[] = {
  "usable",
  "reserved",
  "ACPI reclaim",
  "ACPI NVS",
  "unusable",
};

static void dump_e820(void)
{
  com32sys_t ireg, oreg;
  struct e820_data ed;
  uint32_t type;

  memset(&ireg, 0, sizeof ireg);

  ireg.eax.w[0] = 0xe820;
  ireg.edx.l    = 0x534d4150;
  ireg.ecx.l    = sizeof(struct e820_data);
  ireg.edi.w[0] = OFFS(__com32.cs_bounce);
  ireg.es       = SEG(__com32.cs_bounce);

  memset(&ed, 0, sizeof ed);
  ed.extattr = 1;

  do {
    memcpy(__com32.cs_bounce, &ed, sizeof ed);

    __intcall(0x15, &ireg, &oreg);
    if (oreg.eflags.l & EFLAGS_CF ||
	oreg.eax.l != 0x534d4150 ||
	oreg.ecx.l < 20)
      break;

    memcpy(&ed, __com32.cs_bounce, sizeof ed);

    if (oreg.ecx.l < 24)
      ed.extattr = 1;

    /* ebx base length end type */
    printf("%8x %016llx %016llx %016llx %d [%x]",
	   ireg.ebx.l, ed.base, ed.len, ed.base+ed.len, ed.type, ed.extattr);

    type = ed.type - 1;
    if (type < sizeof(e820_types)/sizeof(e820_types[0]))
      printf(" %s", e820_types[type]);

    putchar('\n');

    ireg.ebx.l = oreg.ebx.l;
  } while (ireg.ebx.l);
}

static void dump_legacy(void)
{
  com32sys_t ireg, oreg;
  uint16_t dosram = *(uint16_t *)0x413;
  struct { uint16_t offs, seg; } * const ivt = (void *)0;

  memset(&ireg, 0, sizeof ireg);

  __intcall(0x12, &ireg, &oreg);

  printf("INT 15h = %04x:%04x  DOS RAM: %dK (0x%05x)  INT 12h: %dK (0x%05x)\n",
	 ivt[0x15].seg, ivt[0x15].offs,
	 dosram, dosram << 10,
	 oreg.eax.w[0], oreg.eax.w[0] << 10);

  ireg.eax.b[1] = 0x88;
  __intcall(0x15, &ireg, &oreg);

  printf("INT 15 88: 0x%04x (%uK)  ",
	 oreg.eax.w[0], oreg.eax.w[0]);

  ireg.eax.w[0] = 0xe801;
  __intcall(0x15, &ireg, &oreg);

  printf("INT 15 E801: 0x%04x (%uK) 0x%04x (%uK)\n",
	 oreg.ecx.w[0], oreg.ecx.w[0], oreg.edx.w[0], oreg.edx.w[0] << 6);
}

int main(void)
{
  openconsole(&dev_null_r, &dev_stdcon_w);

  dump_legacy();
  dump_e820();

  return 0;
}