347 lines
8.5 KiB
C
347 lines
8.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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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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*
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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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*
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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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*/
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/* This is an emulation of EFI runtime services.
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This allows a more uniform boot on i386 machines.
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As it emulates only runtime service it isn't able
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to chainload EFI bootloader on non-EFI system. */
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/normal.h>
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#include <grub/mm.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/efiemu/efiemu.h>
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#include <grub/machine/efiemu.h>
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#include <grub/command.h>
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/* System table. Two version depending on mode */
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grub_efi_system_table32_t *grub_efiemu_system_table32 = 0;
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grub_efi_system_table64_t *grub_efiemu_system_table64 = 0;
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/* Modules may need to execute some actions after memory allocation happens */
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static struct grub_efiemu_prepare_hook *efiemu_prepare_hooks = 0;
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/* Linked list of configuration tables */
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static struct grub_efiemu_configuration_table *efiemu_config_tables = 0;
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static int prepared = 0;
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/* Free all allocated space */
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grub_err_t
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grub_efiemu_unload (void)
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{
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struct grub_efiemu_configuration_table *cur, *d;
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struct grub_efiemu_prepare_hook *curhook, *d2;
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grub_efiemu_loadcore_unload ();
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grub_efiemu_mm_unload ();
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for (cur = efiemu_config_tables; cur;)
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{
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d = cur->next;
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if (cur->unload)
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cur->unload (cur->data);
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grub_free (cur);
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cur = d;
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}
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efiemu_config_tables = 0;
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for (curhook = efiemu_prepare_hooks; curhook;)
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{
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d2 = curhook->next;
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if (curhook->unload)
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curhook->unload (curhook->data);
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grub_free (curhook);
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curhook = d2;
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}
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efiemu_prepare_hooks = 0;
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prepared = 0;
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return GRUB_ERR_NONE;
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}
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/* Remove previously registered table from the list */
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grub_err_t
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grub_efiemu_unregister_configuration_table (grub_efi_guid_t guid)
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{
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struct grub_efiemu_configuration_table *cur, *prev;
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/* Special treating if head is to remove */
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while (efiemu_config_tables
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&& !grub_memcmp (&(efiemu_config_tables->guid), &guid, sizeof (guid)))
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{
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if (efiemu_config_tables->unload)
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efiemu_config_tables->unload (efiemu_config_tables->data);
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cur = efiemu_config_tables->next;
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grub_free (efiemu_config_tables);
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efiemu_config_tables = cur;
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}
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if (!efiemu_config_tables)
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return GRUB_ERR_NONE;
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/* Remove from chain */
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for (prev = efiemu_config_tables, cur = prev->next; cur;)
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if (grub_memcmp (&(cur->guid), &guid, sizeof (guid)) == 0)
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{
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if (cur->unload)
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cur->unload (cur->data);
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prev->next = cur->next;
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grub_free (cur);
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cur = prev->next;
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}
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else
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{
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prev = cur;
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cur = cur->next;
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}
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_efiemu_register_prepare_hook (grub_err_t (*hook) (void *data),
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void (*unload) (void *data),
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void *data)
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{
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struct grub_efiemu_prepare_hook *nhook;
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if (! hook)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "you must supply the hook");
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nhook = (struct grub_efiemu_prepare_hook *) grub_malloc (sizeof (*nhook));
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if (! nhook)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't prepare hook");
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nhook->hook = hook;
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nhook->unload = unload;
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nhook->data = data;
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nhook->next = efiemu_prepare_hooks;
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efiemu_prepare_hooks = nhook;
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return GRUB_ERR_NONE;
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}
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/* Register a configuration table either supplying the address directly
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or with a hook
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*/
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grub_err_t
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grub_efiemu_register_configuration_table (grub_efi_guid_t guid,
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void * (*get_table) (void *data),
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void (*unload) (void *data),
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void *data)
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{
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struct grub_efiemu_configuration_table *tbl;
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grub_err_t err;
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if (! get_table && ! data)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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"you must set at least get_table or data");
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if ((err = grub_efiemu_unregister_configuration_table (guid)))
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return err;
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tbl = (struct grub_efiemu_configuration_table *) grub_malloc (sizeof (*tbl));
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if (! tbl)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't register table");
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tbl->guid = guid;
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tbl->get_table = get_table;
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tbl->unload = unload;
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tbl->data = data;
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tbl->next = efiemu_config_tables;
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efiemu_config_tables = tbl;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_efiemu_unload (grub_command_t cmd __attribute__ ((unused)),
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int argc __attribute__ ((unused)),
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char *args[] __attribute__ ((unused)))
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{
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return grub_efiemu_unload ();
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}
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static grub_err_t
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grub_cmd_efiemu_prepare (grub_command_t cmd __attribute__ ((unused)),
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int argc __attribute__ ((unused)),
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char *args[] __attribute__ ((unused)))
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{
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return grub_efiemu_prepare ();
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}
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int
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grub_efiemu_exit_boot_services (grub_efi_uintn_t map_key
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__attribute__ ((unused)))
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{
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/* Nothing to do here yet */
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return 1;
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}
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int
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grub_efiemu_finish_boot_services (void)
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{
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/* Nothing to do here yet */
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return 1;
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}
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/* Load the runtime from the file FILENAME. */
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static grub_err_t
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grub_efiemu_load_file (const char *filename)
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{
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grub_file_t file;
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grub_err_t err;
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file = grub_file_open (filename);
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if (! file)
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return 0;
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err = grub_efiemu_mm_init ();
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if (err)
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{
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grub_file_close (file);
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grub_efiemu_unload ();
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return grub_error (grub_errno, "Couldn't init memory management");
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}
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grub_dprintf ("efiemu", "mm initialized\n");
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err = grub_efiemu_loadcore_init (file);
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if (err)
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{
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grub_file_close (file);
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grub_efiemu_unload ();
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return err;
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}
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grub_file_close (file);
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/* For configuration tables entry in system table. */
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grub_efiemu_request_symbols (1);
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_efiemu_autocore (void)
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{
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const char *prefix;
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char *filename;
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char *suffix;
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grub_err_t err;
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if (grub_efiemu_sizeof_uintn_t () != 0)
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return GRUB_ERR_NONE;
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prefix = grub_env_get ("prefix");
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if (! prefix)
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return grub_error (GRUB_ERR_FILE_NOT_FOUND,
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"couldn't find efiemu core because prefix "
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"isn't set");
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suffix = grub_efiemu_get_default_core_name ();
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filename = grub_malloc (grub_strlen (prefix) + grub_strlen (suffix) + 2);
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if (! filename)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"couldn't allocate temporary space");
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grub_sprintf (filename, "%s/%s", prefix, suffix);
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err = grub_efiemu_load_file (filename);
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grub_free (filename);
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if (err)
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return err;
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#ifndef GRUB_UTIL
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err = grub_machine_efiemu_init_tables ();
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if (err)
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return err;
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#endif
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_efiemu_prepare (void)
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{
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grub_err_t err;
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if (prepared)
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return GRUB_ERR_NONE;
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grub_dprintf ("efiemu", "Preparing %d-bit efiemu\n",
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8 * grub_efiemu_sizeof_uintn_t ());
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err = grub_efiemu_autocore ();
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/* Create NVRAM. */
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grub_efiemu_pnvram ();
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prepared = 1;
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if (grub_efiemu_sizeof_uintn_t () == 4)
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return grub_efiemu_prepare32 (efiemu_prepare_hooks, efiemu_config_tables);
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else
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return grub_efiemu_prepare64 (efiemu_prepare_hooks, efiemu_config_tables);
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}
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static grub_err_t
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grub_cmd_efiemu_load (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *args[])
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{
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grub_err_t err;
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grub_efiemu_unload ();
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "filename required");
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err = grub_efiemu_load_file (args[0]);
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if (err)
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return err;
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#ifndef GRUB_UTIL
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err = grub_machine_efiemu_init_tables ();
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if (err)
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return err;
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#endif
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return GRUB_ERR_NONE;
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}
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static grub_command_t cmd_loadcore, cmd_prepare, cmd_unload;
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GRUB_MOD_INIT(efiemu)
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{
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cmd_loadcore = grub_register_command ("efiemu_loadcore",
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grub_cmd_efiemu_load,
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"efiemu_loadcore FILE",
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"Load and initialize EFI emulator");
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cmd_prepare = grub_register_command ("efiemu_prepare",
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grub_cmd_efiemu_prepare,
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"efiemu_prepare",
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"Finalize loading of EFI emulator");
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cmd_unload = grub_register_command ("efiemu_unload", grub_cmd_efiemu_unload,
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"efiemu_unload",
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"Unload EFI emulator");
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}
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GRUB_MOD_FINI(efiemu)
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{
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grub_unregister_command (cmd_loadcore);
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grub_unregister_command (cmd_prepare);
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grub_unregister_command (cmd_unload);
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}
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