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/* init.c - generic EFI initialization and finalization */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 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/efi/efi.h>
#include <grub/efi/console.h>
#include <grub/efi/disk.h>
#include <grub/efi/sb.h>
#include <grub/lockdown.h>
#include <grub/term.h>
#include <grub/misc.h>
#include <grub/env.h>
#include <grub/mm.h>
#include <grub/kernel.h>
#include <grub/stack_protector.h>
#ifdef GRUB_STACK_PROTECTOR
static grub_efi_guid_t rng_protocol_guid = GRUB_EFI_RNG_PROTOCOL_GUID;
/*
* Don't put this on grub_efi_init()'s local stack to avoid it
* getting a stack check.
*/
static grub_efi_uint8_t stack_chk_guard_buf[32];
grub_addr_t __stack_chk_guard;
void __attribute__ ((noreturn))
__stack_chk_fail (void)
{
/*
* Assume it's not safe to call into EFI Boot Services. Sorry, that
* means no console message here.
*/
do
{
/* Do not optimize out the loop. */
asm volatile ("");
}
while (1);
}
static void
stack_protector_init (void)
{
grub_efi_rng_protocol_t *rng;
/* Set up the stack canary. Make errors here non-fatal for now. */
rng = grub_efi_locate_protocol (&rng_protocol_guid, NULL);
if (rng != NULL)
{
grub_efi_status_t status;
status = efi_call_4 (rng->get_rng, rng, NULL, sizeof (stack_chk_guard_buf),
stack_chk_guard_buf);
if (status == GRUB_EFI_SUCCESS)
grub_memcpy (&__stack_chk_guard, stack_chk_guard_buf, sizeof (__stack_chk_guard));
}
}
#else
static void
stack_protector_init (void)
{
}
#endif
grub_addr_t grub_modbase;
void
grub_efi_init (void)
{
grub_modbase = grub_efi_modules_addr ();
/* First of all, initialize the console so that GRUB can display
messages. */
grub_console_init ();
stack_protector_init ();
/* Initialize the memory management system. */
grub_efi_mm_init ();
/*
* Lockdown the GRUB and register the shim_lock verifier
* if the UEFI Secure Boot is enabled.
*/
if (grub_efi_get_secureboot () == GRUB_EFI_SECUREBOOT_MODE_ENABLED)
{
grub_lockdown ();
grub_shim_lock_verifier_setup ();
}
efi_call_4 (grub_efi_system_table->boot_services->set_watchdog_timer,
0, 0, 0, NULL);
grub_efidisk_init ();
}
void (*grub_efi_net_config) (grub_efi_handle_t hnd,
char **device,
char **path);
void
grub_machine_get_bootlocation (char **device, char **path)
{
grub_efi_loaded_image_t *image = NULL;
char *p;
image = grub_efi_get_loaded_image (grub_efi_image_handle);
if (!image)
return;
*device = grub_efidisk_get_device_name (image->device_handle);
if (!*device && grub_efi_net_config)
{
grub_efi_net_config (image->device_handle, device, path);
return;
}
*path = grub_efi_get_filename (image->file_path);
if (*path)
{
/* Get the directory. */
p = grub_strrchr (*path, '/');
if (p)
*p = '\0';
}
}
void
grub_efi_fini (void)
{
grub_efidisk_fini ();
grub_console_fini ();
}
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