/* Export pnvram and some variables for runtime */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB 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, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
/* Place for final location of variables */
static int nvram_handle = 0;
static int nvramsize_handle = 0;
static int high_monotonic_count_handle = 0;
static int timezone_handle = 0;
static int accuracy_handle = 0;
static int daylight_handle = 0;
/* Temporary place */
static grub_uint8_t *nvram;
static grub_size_t nvramsize;
static grub_uint32_t high_monotonic_count;
static grub_int16_t timezone;
static grub_uint8_t daylight;
static grub_uint32_t accuracy;
static const struct grub_arg_option options[] = {
{"size", 's', 0, "number of bytes to reserve for pseudo NVRAM", 0,
ARG_TYPE_INT},
{"high-monotonic-count", 'm', 0,
"Initial value of high monotonic count", 0, ARG_TYPE_INT},
{"timezone", 't', 0,
"Timezone, offset in minutes from GMT", 0, ARG_TYPE_INT},
{"accuracy", 'a', 0,
"Accuracy of clock, in 1e-12 units", 0, ARG_TYPE_INT},
{"daylight", 'd', 0,
"Daylight value, as per EFI specifications", 0, ARG_TYPE_INT},
{0, 0, 0, 0, 0, 0}
};
/* Parse signed value */
static int
grub_strtosl (char *arg, char **end, int base)
{
if (arg[0] == '-')
return -grub_strtoul (arg + 1, end, base);
return grub_strtoul (arg, end, base);
}
/* Export stuff for efiemu */
static grub_err_t
nvram_set (void * data __attribute__ ((unused)))
{
/* Take definitive pointers */
grub_uint8_t *nvram_def = grub_efiemu_mm_obtain_request (nvram_handle);
grub_uint32_t *nvramsize_def
= grub_efiemu_mm_obtain_request (nvramsize_handle);
grub_uint32_t *high_monotonic_count_def
= grub_efiemu_mm_obtain_request (high_monotonic_count_handle);
grub_int16_t *timezone_def
= grub_efiemu_mm_obtain_request (timezone_handle);
grub_uint8_t *daylight_def
= grub_efiemu_mm_obtain_request (daylight_handle);
grub_uint32_t *accuracy_def
= grub_efiemu_mm_obtain_request (accuracy_handle);
/* Copy to definitive loaction */
grub_dprintf ("efiemu", "preparing pnvram\n");
grub_memcpy (nvram_def, nvram, nvramsize);
*nvramsize_def = nvramsize;
*high_monotonic_count_def = high_monotonic_count;
*timezone_def = timezone;
*daylight_def = daylight;
*accuracy_def = accuracy;
/* Register symbols */
grub_efiemu_register_symbol ("efiemu_variables", nvram_handle, 0);
grub_efiemu_register_symbol ("efiemu_varsize", nvramsize_handle, 0);
grub_efiemu_register_symbol ("efiemu_high_monotonic_count",
high_monotonic_count_handle, 0);
grub_efiemu_register_symbol ("efiemu_time_zone", timezone_handle, 0);
grub_efiemu_register_symbol ("efiemu_time_daylight", daylight_handle, 0);
grub_efiemu_register_symbol ("efiemu_time_accuracy",
accuracy_handle, 0);
return GRUB_ERR_NONE;
}
static void
nvram_unload (void * data __attribute__ ((unused)))
{
grub_efiemu_mm_return_request (nvram_handle);
grub_efiemu_mm_return_request (nvramsize_handle);
grub_efiemu_mm_return_request (high_monotonic_count_handle);
grub_efiemu_mm_return_request (timezone_handle);
grub_efiemu_mm_return_request (accuracy_handle);
grub_efiemu_mm_return_request (daylight_handle);
grub_free (nvram);
nvram = 0;
}
/* Load the variables file It's in format
guid1:attr1:name1:data1;
guid2:attr2:name2:data2;
...
Where all fields are in hex
*/
static grub_err_t
read_pnvram (char *filename)
{
char *buf, *ptr, *ptr2;
grub_file_t file;
grub_size_t size;
grub_uint8_t *nvramptr = nvram;
struct efi_variable *efivar;
grub_size_t guidlen, datalen;
unsigned i, j;
file = grub_file_open (filename);
if (!file)
return grub_error (GRUB_ERR_BAD_OS, "couldn't read pnvram");
size = grub_file_size (file);
buf = grub_malloc (size + 1);
if (!buf)
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't read pnvram");
if (grub_file_read (file, buf, size) != (grub_ssize_t) size)
return grub_error (GRUB_ERR_BAD_OS, "couldn't read pnvram");
buf[size] = 0;
grub_file_close (file);
for (ptr = buf; *ptr; )
{
if (grub_isspace (*ptr))
{
ptr++;
continue;
}
efivar = (struct efi_variable *) nvramptr;
if (nvramptr - nvram + sizeof (struct efi_variable) > nvramsize)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"file is too large for reserved variable space");
nvramptr += sizeof (struct efi_variable);
/* look ahow long guid field is*/
guidlen = 0;
for (ptr2 = ptr; (grub_isspace (*ptr2)
|| (*ptr2 >= '0' && *ptr2 <= '9')
|| (*ptr2 >= 'a' && *ptr2 <= 'f')
|| (*ptr2 >= 'A' && *ptr2 <= 'F'));
ptr2++)
if (!grub_isspace (*ptr2))
guidlen++;
guidlen /= 2;
/* Read guid */
if (guidlen != sizeof (efivar->guid))
{
grub_free (buf);
return grub_error (GRUB_ERR_BAD_OS, "can't parse %s", filename);
}
for (i = 0; i < 2 * sizeof (efivar->guid); i++)
{
int hex = 0;
while (grub_isspace (*ptr))
ptr++;
if (*ptr >= '0' && *ptr <= '9')
hex = *ptr - '0';
if (*ptr >= 'a' && *ptr <= 'f')
hex = *ptr - 'a' + 10;
if (*ptr >= 'A' && *ptr <= 'F')
hex = *ptr - 'A' + 10;
if (i%2 == 0)
((grub_uint8_t *)&(efivar->guid))[i/2] = hex << 4;
else
((grub_uint8_t *)&(efivar->guid))[i/2] |= hex;
ptr++;
}
while (grub_isspace (*ptr))
ptr++;
if (*ptr != ':')
{
grub_dprintf ("efiemu", "Not colon\n");
grub_free (buf);
return grub_error (GRUB_ERR_BAD_OS, "can't parse %s", filename);
}
ptr++;
while (grub_isspace (*ptr))
ptr++;
/* Attributes can be just parsed by existing functions */
efivar->attributes = grub_strtoul (ptr, &ptr, 16);
while (grub_isspace (*ptr))
ptr++;
if (*ptr != ':')
{
grub_dprintf ("efiemu", "Not colon\n");
grub_free (buf);
return grub_error (GRUB_ERR_BAD_OS, "can't parse %s", filename);
}
ptr++;
while (grub_isspace (*ptr))
ptr++;
/* Read name and value */
for (j = 0; j < 2; j++)
{
/* Look the length */
datalen = 0;
for (ptr2 = ptr; *ptr2 && (grub_isspace (*ptr2)
|| (*ptr2 >= '0' && *ptr2 <= '9')
|| (*ptr2 >= 'a' && *ptr2 <= 'f')
|| (*ptr2 >= 'A' && *ptr2 <= 'F'));
ptr2++)
if (!grub_isspace (*ptr2))
datalen++;
datalen /= 2;
if (nvramptr - nvram + datalen > nvramsize)
{
grub_free (buf);
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"file is too large for reserved "
" variable space");
}
for (i = 0; i < 2 * datalen; i++)
{
int hex = 0;
while (grub_isspace (*ptr))
ptr++;
if (*ptr >= '0' && *ptr <= '9')
hex = *ptr - '0';
if (*ptr >= 'a' && *ptr <= 'f')
hex = *ptr - 'a' + 10;
if (*ptr >= 'A' && *ptr <= 'F')
hex = *ptr - 'A' + 10;
if (i%2 == 0)
nvramptr[i/2] = hex << 4;
else
nvramptr[i/2] |= hex;
ptr++;
}
nvramptr += datalen;
while (grub_isspace (*ptr))
ptr++;
if (*ptr != (j ? ';' : ':'))
{
grub_free (buf);
grub_dprintf ("efiemu", j?"Not semicolon\n":"Not colon\n");
return grub_error (GRUB_ERR_BAD_OS, "can't parse %s", filename);
}
if (j)
efivar->size = datalen;
else
efivar->namelen = datalen;
ptr++;
}
}
grub_free (buf);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_efiemu_make_nvram (void)
{
grub_err_t err;
err = grub_efiemu_autocore ();
if (err)
{
grub_free (nvram);
return err;
}
err = grub_efiemu_register_prepare_hook (nvram_set, nvram_unload, 0);
if (err)
{
grub_free (nvram);
return err;
}
nvram_handle
= grub_efiemu_request_memalign (1, nvramsize,
GRUB_EFI_RUNTIME_SERVICES_DATA);
nvramsize_handle
= grub_efiemu_request_memalign (1, sizeof (grub_uint32_t),
GRUB_EFI_RUNTIME_SERVICES_DATA);
high_monotonic_count_handle
= grub_efiemu_request_memalign (1, sizeof (grub_uint32_t),
GRUB_EFI_RUNTIME_SERVICES_DATA);
timezone_handle
= grub_efiemu_request_memalign (1, sizeof (grub_uint16_t),
GRUB_EFI_RUNTIME_SERVICES_DATA);
daylight_handle
= grub_efiemu_request_memalign (1, sizeof (grub_uint8_t),
GRUB_EFI_RUNTIME_SERVICES_DATA);
accuracy_handle
= grub_efiemu_request_memalign (1, sizeof (grub_uint32_t),
GRUB_EFI_RUNTIME_SERVICES_DATA);
grub_efiemu_request_symbols (6);
return GRUB_ERR_NONE;
}
grub_err_t
grub_efiemu_pnvram (void)
{
if (nvram)
return GRUB_ERR_NONE;
nvramsize = 2048;
high_monotonic_count = 1;
timezone = GRUB_EFI_UNSPECIFIED_TIMEZONE;
accuracy = 50000000;
daylight = 0;
nvram = grub_malloc (nvramsize);
if (!nvram)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"Couldn't allocate space for temporary pnvram storage");
grub_memset (nvram, 0, nvramsize);
return grub_efiemu_make_nvram ();
}
static grub_err_t
grub_cmd_efiemu_pnvram (struct grub_extcmd *cmd,
int argc, char **args)
{
struct grub_arg_list *state = cmd->state;
grub_err_t err;
if (argc > 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "only one argument expected");
nvramsize = state[0].set ? grub_strtoul (state[0].arg, 0, 0) : 2048;
high_monotonic_count = state[1].set ? grub_strtoul (state[1].arg, 0, 0) : 1;
timezone = state[2].set ? grub_strtosl (state[2].arg, 0, 0)
: GRUB_EFI_UNSPECIFIED_TIMEZONE;
accuracy = state[3].set ? grub_strtoul (state[3].arg, 0, 0) : 50000000;
daylight = state[4].set ? grub_strtoul (state[4].arg, 0, 0) : 0;
nvram = grub_malloc (nvramsize);
if (!nvram)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"Couldn't allocate space for temporary pnvram storage");
grub_memset (nvram, 0, nvramsize);
if (argc == 1 && (err = read_pnvram (args[0])))
{
grub_free (nvram);
return err;
}
return grub_efiemu_make_nvram ();
}
static grub_extcmd_t cmd;
void grub_efiemu_pnvram_cmd_register (void);
void grub_efiemu_pnvram_cmd_unregister (void);
void
grub_efiemu_pnvram_cmd_register (void)
{
cmd = grub_register_extcmd ("efiemu_pnvram", grub_cmd_efiemu_pnvram,
GRUB_COMMAND_FLAG_BOTH,
"efiemu_pnvram [FILENAME]",
"Initialise pseudo-NVRAM and load variables "
"from FILE",
options);
}
void
grub_efiemu_pnvram_cmd_unregister (void)
{
grub_unregister_extcmd (cmd);
}