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/* Export pnvram and some variables for runtime */
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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#include <grub/file.h>
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#include <grub/normal.h>
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#include <grub/misc.h>
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#include <grub/charset.h>
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#include <grub/efiemu/efiemu.h>
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#include <grub/efiemu/runtime.h>
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#include <grub/extcmd.h>
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/* Place for final location of variables */
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static int nvram_handle = 0;
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static int nvramsize_handle = 0;
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static int high_monotonic_count_handle = 0;
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static int timezone_handle = 0;
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static int accuracy_handle = 0;
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static int daylight_handle = 0;
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static grub_size_t nvramsize;
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/* Parse signed value */
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grub_strtosl (const char *arg, char **end, int base)
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return -grub_strtoul (arg + 1, end, base);
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return grub_strtoul (arg, end, base);
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if (c >= '0' && c <= '9')
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if (c >= 'a' && c <= 'z')
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if (c >= 'A' && c <= 'Z')
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static inline grub_err_t
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unescape (char *in, char *out, char *outmax, int *len)
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for (ptr = in; *ptr && dptr < outmax; )
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if (*ptr == '%' && ptr[1] && ptr[2])
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*dptr = (hextoval (ptr[1]) << 4) | (hextoval (ptr[2]));
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"too many NVRAM variables for reserved variable space."
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" Try increasing EfiEmu.pnvram.size");
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/* Export stuff for efiemu */
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nvram_set (void * data __attribute__ ((unused)))
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/* Take definitive pointers */
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char *nvram = grub_efiemu_mm_obtain_request (nvram_handle);
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grub_uint32_t *nvramsize_def
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= grub_efiemu_mm_obtain_request (nvramsize_handle);
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grub_uint32_t *high_monotonic_count
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= grub_efiemu_mm_obtain_request (high_monotonic_count_handle);
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grub_int16_t *timezone
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= grub_efiemu_mm_obtain_request (timezone_handle);
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grub_uint8_t *daylight
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= grub_efiemu_mm_obtain_request (daylight_handle);
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grub_uint32_t *accuracy
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= grub_efiemu_mm_obtain_request (accuracy_handle);
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auto int iterate_env (struct grub_env_var *var);
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int iterate_env (struct grub_env_var *var)
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char *guid, *attr, *name, *varname;
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struct efi_variable *efivar;
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grub_uint64_t guidcomp;
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if (grub_memcmp (var->name, "EfiEmu.pnvram.",
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sizeof ("EfiEmu.pnvram.") - 1) != 0)
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guid = var->name + sizeof ("EfiEmu.pnvram.") - 1;
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attr = grub_strchr (guid, '.');
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name = grub_strchr (attr, '.');
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efivar = (struct efi_variable *) nvramptr;
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if (nvramptr - nvram + sizeof (struct efi_variable) > nvramsize)
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"too many NVRAM variables for reserved variable space."
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" Try increasing EfiEmu.pnvram.size");
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nvramptr += sizeof (struct efi_variable);
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efivar->guid.data1 = grub_cpu_to_le32 (grub_strtoul (guid, &guid, 16));
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efivar->guid.data2 = grub_cpu_to_le16 (grub_strtoul (guid, &guid, 16));
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efivar->guid.data3 = grub_cpu_to_le16 (grub_strtoul (guid, &guid, 16));
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guidcomp = grub_strtoull (guid, 0, 16);
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for (i = 0; i < 8; i++)
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efivar->guid.data4[i] = (guidcomp >> (56 - 8 * i)) & 0xff;
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efivar->attributes = grub_strtoull (attr, 0, 16);
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varname = grub_malloc (grub_strlen (name) + 1);
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if (unescape (name, varname, varname + grub_strlen (name) + 1, &len))
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len = grub_utf8_to_utf16 ((grub_uint16_t *) nvramptr,
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(nvramsize - (nvramptr - nvram)) / 2,
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(grub_uint8_t *) varname, len, NULL);
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grub_error (GRUB_ERR_BAD_ARGUMENT, "broken UTF-8 in variable name");
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*((grub_uint16_t *) nvramptr) = 0;
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efivar->namelen = 2 * len + 2;
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if (unescape (var->value, nvramptr, nvram + nvramsize, &len))
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/* Copy to definitive loaction */
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grub_dprintf ("efiemu", "preparing pnvram\n");
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env = grub_env_get ("EfiEmu.pnvram.high_monotonic_count");
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*high_monotonic_count = env ? grub_strtoul (env, 0, 0) : 1;
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env = grub_env_get ("EfiEmu.pnvram.timezone");
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*timezone = env ? grub_strtosl (env, 0, 0) : GRUB_EFI_UNSPECIFIED_TIMEZONE;
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env = grub_env_get ("EfiEmu.pnvram.accuracy");
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*accuracy = env ? grub_strtoul (env, 0, 0) : 50000000;
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env = grub_env_get ("EfiEmu.pnvram.daylight");
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*daylight = env ? grub_strtoul (env, 0, 0) : 0;
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grub_memset (nvram, 0, nvramsize);
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grub_env_iterate (iterate_env);
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*nvramsize_def = nvramsize;
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/* Register symbols */
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grub_efiemu_register_symbol ("efiemu_variables", nvram_handle, 0);
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grub_efiemu_register_symbol ("efiemu_varsize", nvramsize_handle, 0);
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grub_efiemu_register_symbol ("efiemu_high_monotonic_count",
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high_monotonic_count_handle, 0);
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grub_efiemu_register_symbol ("efiemu_time_zone", timezone_handle, 0);
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grub_efiemu_register_symbol ("efiemu_time_daylight", daylight_handle, 0);
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grub_efiemu_register_symbol ("efiemu_time_accuracy",
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return GRUB_ERR_NONE;
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nvram_unload (void * data __attribute__ ((unused)))
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grub_efiemu_mm_return_request (nvram_handle);
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grub_efiemu_mm_return_request (nvramsize_handle);
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grub_efiemu_mm_return_request (high_monotonic_count_handle);
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grub_efiemu_mm_return_request (timezone_handle);
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grub_efiemu_mm_return_request (accuracy_handle);
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grub_efiemu_mm_return_request (daylight_handle);
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grub_efiemu_pnvram (void)
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size = grub_env_get ("EfiEmu.pnvram.size");
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nvramsize = grub_strtoul (size, 0, 0);
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err = grub_efiemu_register_prepare_hook (nvram_set, nvram_unload, 0);
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= grub_efiemu_request_memalign (1, nvramsize,
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GRUB_EFI_RUNTIME_SERVICES_DATA);
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= grub_efiemu_request_memalign (1, sizeof (grub_uint32_t),
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GRUB_EFI_RUNTIME_SERVICES_DATA);
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high_monotonic_count_handle
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= grub_efiemu_request_memalign (1, sizeof (grub_uint32_t),
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GRUB_EFI_RUNTIME_SERVICES_DATA);
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= grub_efiemu_request_memalign (1, sizeof (grub_uint16_t),
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GRUB_EFI_RUNTIME_SERVICES_DATA);
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= grub_efiemu_request_memalign (1, sizeof (grub_uint8_t),
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GRUB_EFI_RUNTIME_SERVICES_DATA);
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= grub_efiemu_request_memalign (1, sizeof (grub_uint32_t),
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GRUB_EFI_RUNTIME_SERVICES_DATA);
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return GRUB_ERR_NONE;