/*
* 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/>.
*/
/* This is an emulation of EFI runtime services.
This allows a more uniform boot on i386 machines.
As it emulates only runtime service it isn't able
to chainload EFI bootloader on non-EFI system. */
#include <grub/file.h>
#include <grub/err.h>
#include <grub/normal.h>
#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/efiemu/efiemu.h>
#include <grub/command.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* System table. Two version depending on mode */
grub_efi_system_table32_t *grub_efiemu_system_table32 = 0;
grub_efi_system_table64_t *grub_efiemu_system_table64 = 0;
/* Modules may need to execute some actions after memory allocation happens */
static struct grub_efiemu_prepare_hook *efiemu_prepare_hooks = 0;
/* Linked list of configuration tables */
static struct grub_efiemu_configuration_table *efiemu_config_tables = 0;
static int prepared = 0;
/* Free all allocated space */
grub_err_t
grub_efiemu_unload (void)
{
struct grub_efiemu_configuration_table *cur, *d;
struct grub_efiemu_prepare_hook *curhook, *d2;
grub_efiemu_loadcore_unload ();
grub_efiemu_mm_unload ();
for (cur = efiemu_config_tables; cur;)
{
d = cur->next;
if (cur->unload)
cur->unload (cur->data);
grub_free (cur);
cur = d;
}
efiemu_config_tables = 0;
for (curhook = efiemu_prepare_hooks; curhook;)
{
d2 = curhook->next;
if (curhook->unload)
curhook->unload (curhook->data);
grub_free (curhook);
curhook = d2;
}
efiemu_prepare_hooks = 0;
prepared = 0;
return GRUB_ERR_NONE;
}
/* Remove previously registered table from the list */
grub_err_t
grub_efiemu_unregister_configuration_table (grub_efi_guid_t guid)
{
struct grub_efiemu_configuration_table *cur, *prev;
/* Special treating if head is to remove */
while (efiemu_config_tables
&& !grub_memcmp (&(efiemu_config_tables->guid), &guid, sizeof (guid)))
{
if (efiemu_config_tables->unload)
efiemu_config_tables->unload (efiemu_config_tables->data);
cur = efiemu_config_tables->next;
grub_free (efiemu_config_tables);
efiemu_config_tables = cur;
}
if (!efiemu_config_tables)
return GRUB_ERR_NONE;
/* Remove from chain */
for (prev = efiemu_config_tables, cur = prev->next; cur;)
if (grub_memcmp (&(cur->guid), &guid, sizeof (guid)) == 0)
{
if (cur->unload)
cur->unload (cur->data);
prev->next = cur->next;
grub_free (cur);
cur = prev->next;
}
else
{
prev = cur;
cur = cur->next;
}
return GRUB_ERR_NONE;
}
grub_err_t
grub_efiemu_register_prepare_hook (grub_err_t (*hook) (void *data),
void (*unload) (void *data),
void *data)
{
struct grub_efiemu_prepare_hook *nhook;
if (! hook)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "you must supply the hook");
nhook = (struct grub_efiemu_prepare_hook *) grub_malloc (sizeof (*nhook));
if (! nhook)
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't prepare hook");
nhook->hook = hook;
nhook->unload = unload;
nhook->data = data;
nhook->next = efiemu_prepare_hooks;
efiemu_prepare_hooks = nhook;
return GRUB_ERR_NONE;
}
/* Register a configuration table either supplying the address directly
or with a hook
*/
grub_err_t
grub_efiemu_register_configuration_table (grub_efi_guid_t guid,
void * (*get_table) (void *data),
void (*unload) (void *data),
void *data)
{
struct grub_efiemu_configuration_table *tbl;
grub_err_t err;
if (! get_table && ! data)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"you must set at least get_table or data");
err = grub_efiemu_unregister_configuration_table (guid);
if (err)
return err;
tbl = (struct grub_efiemu_configuration_table *) grub_malloc (sizeof (*tbl));
if (! tbl)
return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't register table");
tbl->guid = guid;
tbl->get_table = get_table;
tbl->unload = unload;
tbl->data = data;
tbl->next = efiemu_config_tables;
efiemu_config_tables = tbl;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_efiemu_unload (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char *args[] __attribute__ ((unused)))
{
return grub_efiemu_unload ();
}
static grub_err_t
grub_cmd_efiemu_prepare (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char *args[] __attribute__ ((unused)))
{
return grub_efiemu_prepare ();
}
/* Load the runtime from the file FILENAME. */
static grub_err_t
grub_efiemu_load_file (const char *filename)
{
grub_file_t file;
grub_err_t err;
file = grub_file_open (filename);
if (! file)
return grub_errno;
err = grub_efiemu_mm_init ();
if (err)
{
grub_file_close (file);
grub_efiemu_unload ();
return grub_error (grub_errno, "couldn't init memory management");
}
grub_dprintf ("efiemu", "mm initialized\n");
err = grub_efiemu_loadcore_init (file);
if (err)
{
grub_file_close (file);
grub_efiemu_unload ();
return err;
}
grub_file_close (file);
/* For configuration tables entry in system table. */
grub_efiemu_request_symbols (1);
return GRUB_ERR_NONE;
}
grub_err_t
grub_efiemu_autocore (void)
{
const char *prefix;
char *filename;
const char *suffix;
grub_err_t err;
if (grub_efiemu_sizeof_uintn_t () != 0)
return GRUB_ERR_NONE;
prefix = grub_env_get ("prefix");
if (! prefix)
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
"couldn't find efiemu core because prefix "
"isn't set");
suffix = grub_efiemu_get_default_core_name ();
filename = grub_xasprintf ("%s/%s", prefix, suffix);
if (! filename)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"couldn't allocate temporary space");
err = grub_efiemu_load_file (filename);
grub_free (filename);
if (err)
return err;
#ifndef GRUB_MACHINE_EMU
err = grub_machine_efiemu_init_tables ();
if (err)
return err;
#endif
return GRUB_ERR_NONE;
}
grub_err_t
grub_efiemu_prepare (void)
{
grub_err_t err;
if (prepared)
return GRUB_ERR_NONE;
err = grub_efiemu_autocore ();
if (err)
return err;
grub_dprintf ("efiemu", "Preparing %d-bit efiemu\n",
8 * grub_efiemu_sizeof_uintn_t ());
/* Create NVRAM. */
grub_efiemu_pnvram ();
prepared = 1;
if (grub_efiemu_sizeof_uintn_t () == 4)
return grub_efiemu_prepare32 (efiemu_prepare_hooks, efiemu_config_tables);
else
return grub_efiemu_prepare64 (efiemu_prepare_hooks, efiemu_config_tables);
}
static grub_err_t
grub_cmd_efiemu_load (grub_command_t cmd __attribute__ ((unused)),
int argc, char *args[])
{
grub_err_t err;
grub_efiemu_unload ();
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "filename required");
err = grub_efiemu_load_file (args[0]);
if (err)
return err;
#ifndef GRUB_MACHINE_EMU
err = grub_machine_efiemu_init_tables ();
if (err)
return err;
#endif
return GRUB_ERR_NONE;
}
static grub_command_t cmd_loadcore, cmd_prepare, cmd_unload;
GRUB_MOD_INIT(efiemu)
{
cmd_loadcore = grub_register_command ("efiemu_loadcore",
grub_cmd_efiemu_load,
N_("FILE"),
N_("Load and initialize EFI emulator."));
cmd_prepare = grub_register_command ("efiemu_prepare",
grub_cmd_efiemu_prepare,
0,
N_("Finalize loading of EFI emulator."));
cmd_unload = grub_register_command ("efiemu_unload", grub_cmd_efiemu_unload,
0,
N_("Unload EFI emulator."));
}
GRUB_MOD_FINI(efiemu)
{
grub_unregister_command (cmd_loadcore);
grub_unregister_command (cmd_prepare);
grub_unregister_command (cmd_unload);
}