Exemple #1
0
grub_err_t
grub_efi_set_variable(const char *var, const grub_efi_guid_t *guid,
		      void *data, grub_size_t datasize)
{
  grub_efi_status_t status;
  grub_efi_runtime_services_t *r;
  grub_efi_char16_t *var16;
  grub_size_t len, len16;

  len = grub_strlen (var);
  len16 = len * GRUB_MAX_UTF16_PER_UTF8;
  var16 = grub_malloc ((len16 + 1) * sizeof (var16[0]));
  if (!var16)
    return grub_errno;
  len16 = grub_utf8_to_utf16 (var16, len16, (grub_uint8_t *) var, len, NULL);
  var16[len16] = 0;

  r = grub_efi_system_table->runtime_services;

  status = efi_call_5 (r->set_variable, var16, guid, 
		       (GRUB_EFI_VARIABLE_NON_VOLATILE
			| GRUB_EFI_VARIABLE_BOOTSERVICE_ACCESS
			| GRUB_EFI_VARIABLE_RUNTIME_ACCESS),
		       datasize, data);
  if (status == GRUB_EFI_SUCCESS)
    return GRUB_ERR_NONE;

  return grub_error (GRUB_ERR_IO, "could not set EFI variable `%s'", var);
}
Exemple #2
0
void *
grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
		       grub_size_t *datasize_out)
{
  grub_efi_status_t status;
  grub_efi_uintn_t datasize = 0;
  grub_efi_runtime_services_t *r;
  grub_efi_char16_t *var16;
  void *data;
  grub_size_t len, len16;

  *datasize_out = 0;

  len = grub_strlen (var);
  len16 = len * GRUB_MAX_UTF16_PER_UTF8;
  var16 = grub_malloc ((len16 + 1) * sizeof (var16[0]));
  if (!var16)
    return NULL;
  len16 = grub_utf8_to_utf16 (var16, len16, (grub_uint8_t *) var, len, NULL);
  var16[len16] = 0;

  r = grub_efi_system_table->runtime_services;

  status = efi_call_5 (r->get_variable, var16, guid, NULL, &datasize, NULL);

  if (!datasize)
    return NULL;

  data = grub_malloc (datasize);
  if (!data)
    {
      grub_free (var16);
      return NULL;
    }

  status = efi_call_5 (r->get_variable, var16, guid, NULL, &datasize, data);
  grub_free (var16);

  if (status == GRUB_EFI_SUCCESS)
    {
      *datasize_out = datasize;
      return data;
    }

  grub_free (data);
  return NULL;
}
Exemple #3
0
  int iterate_env (struct grub_env_var *var)
  {
    char *guid, *attr, *name, *varname;
    struct efi_variable *efivar;
    int len = 0;
    int i;
    grub_uint64_t guidcomp;

    if (grub_memcmp (var->name, "EfiEmu.pnvram.",
		     sizeof ("EfiEmu.pnvram.") - 1) != 0)
      return 0;

    guid = var->name + sizeof ("EfiEmu.pnvram.") - 1;

    attr = grub_strchr (guid, '.');
    if (!attr)
      return 0;
    attr++;

    name = grub_strchr (attr, '.');
    if (!name)
      return 0;
    name++;

    efivar = (struct efi_variable *) nvramptr;
    if (nvramptr - nvram + sizeof (struct efi_variable) > nvramsize)
      {
	grub_error (GRUB_ERR_OUT_OF_MEMORY,
		    "too many NVRAM variables for reserved variable space."
		    " Try increasing EfiEmu.pnvram.size");
	return 1;
      }

    nvramptr += sizeof (struct efi_variable);

    efivar->guid.data1 = grub_cpu_to_le32 (grub_strtoul (guid, &guid, 16));
    if (*guid != '-')
      return 0;
    guid++;

    efivar->guid.data2 = grub_cpu_to_le16 (grub_strtoul (guid, &guid, 16));
    if (*guid != '-')
      return 0;
    guid++;

    efivar->guid.data3 = grub_cpu_to_le16 (grub_strtoul (guid, &guid, 16));
    if (*guid != '-')
      return 0;
    guid++;

    guidcomp = grub_strtoull (guid, 0, 16);
    for (i = 0; i < 8; i++)
      efivar->guid.data4[i] = (guidcomp >> (56 - 8 * i)) & 0xff;

    efivar->attributes = grub_strtoull (attr, 0, 16);

    varname = grub_malloc (grub_strlen (name) + 1);
    if (! varname)
      return 1;

    if (unescape (name, varname, varname + grub_strlen (name) + 1, &len))
      return 1;

    len = grub_utf8_to_utf16 ((grub_uint16_t *) nvramptr,
			      (nvramsize - (nvramptr - nvram)) / 2,
			      (grub_uint8_t *) varname, len, NULL);

    nvramptr += 2 * len;
    *((grub_uint16_t *) nvramptr) = 0;
    nvramptr += 2;
    efivar->namelen = 2 * len + 2;

    if (unescape (var->value, nvramptr, nvram + nvramsize, &len))
      {
	efivar->namelen = 0;
	return 1;
      }

    nvramptr += len;

    efivar->size = len;

    return 0;
  }