grub/grub-core/efiemu/pnvram.c
2010-05-06 11:34:04 +05:30

280 lines
7.7 KiB
C

/* 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 <http://www.gnu.org/licenses/>.
*/
#include <grub/file.h>
#include <grub/err.h>
#include <grub/normal.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/charset.h>
#include <grub/efiemu/efiemu.h>
#include <grub/efiemu/runtime.h>
#include <grub/extcmd.h>
/* 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;
static grub_size_t nvramsize;
/* Parse signed value */
static int
grub_strtosl (const char *arg, char **end, int base)
{
if (arg[0] == '-')
return -grub_strtoul (arg + 1, end, base);
return grub_strtoul (arg, end, base);
}
static inline int
hextoval (char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'z')
return c - 'a' + 10;
if (c >= 'A' && c <= 'Z')
return c - 'A' + 10;
return 0;
}
static inline grub_err_t
unescape (char *in, char *out, char *outmax, int *len)
{
char *ptr, *dptr;
dptr = out;
for (ptr = in; *ptr && dptr < outmax; )
if (*ptr == '%' && ptr[1] && ptr[2])
{
*dptr = (hextoval (ptr[1]) << 4) | (hextoval (ptr[2]));
ptr += 3;
dptr++;
}
else
{
*dptr = *ptr;
ptr++;
dptr++;
}
if (dptr == outmax)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"too many NVRAM variables for reserved variable space."
" Try increasing EfiEmu.pnvram.size");
*len = dptr - out;
return 0;
}
/* Export stuff for efiemu */
static grub_err_t
nvram_set (void * data __attribute__ ((unused)))
{
const char *env;
/* Take definitive pointers */
char *nvram = 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
= grub_efiemu_mm_obtain_request (high_monotonic_count_handle);
grub_int16_t *timezone
= grub_efiemu_mm_obtain_request (timezone_handle);
grub_uint8_t *daylight
= grub_efiemu_mm_obtain_request (daylight_handle);
grub_uint32_t *accuracy
= grub_efiemu_mm_obtain_request (accuracy_handle);
char *nvramptr;
auto int iterate_env (struct grub_env_var *var);
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);
if (len < 0)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "broken UTF-8 in variable name");
return 1;
}
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;
}
/* Copy to definitive loaction */
grub_dprintf ("efiemu", "preparing pnvram\n");
env = grub_env_get ("EfiEmu.pnvram.high_monotonic_count");
*high_monotonic_count = env ? grub_strtoul (env, 0, 0) : 1;
env = grub_env_get ("EfiEmu.pnvram.timezone");
*timezone = env ? grub_strtosl (env, 0, 0) : GRUB_EFI_UNSPECIFIED_TIMEZONE;
env = grub_env_get ("EfiEmu.pnvram.accuracy");
*accuracy = env ? grub_strtoul (env, 0, 0) : 50000000;
env = grub_env_get ("EfiEmu.pnvram.daylight");
*daylight = env ? grub_strtoul (env, 0, 0) : 0;
nvramptr = nvram;
grub_memset (nvram, 0, nvramsize);
grub_env_iterate (iterate_env);
if (grub_errno)
return grub_errno;
*nvramsize_def = nvramsize;
/* 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_err_t
grub_efiemu_pnvram (void)
{
const char *size;
grub_err_t err;
nvramsize = 0;
size = grub_env_get ("EfiEmu.pnvram.size");
if (size)
nvramsize = grub_strtoul (size, 0, 0);
if (!nvramsize)
nvramsize = 2048;
err = grub_efiemu_register_prepare_hook (nvram_set, nvram_unload, 0);
if (err)
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);
return GRUB_ERR_NONE;
}