2N/A/* loadbios.c - command to load a bios dump */
2N/A/*
2N/A * GRUB -- GRand Unified Bootloader
2N/A * Copyright (C) 2009 Free Software Foundation, Inc.
2N/A *
2N/A * GRUB is free software: you can redistribute it and/or modify
2N/A * it under the terms of the GNU General Public License as published by
2N/A * the Free Software Foundation, either version 3 of the License, or
2N/A * (at your option) any later version.
2N/A *
2N/A * GRUB is distributed in the hope that it will be useful,
2N/A * but WITHOUT ANY WARRANTY; without even the implied warranty of
2N/A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2N/A * GNU General Public License for more details.
2N/A *
2N/A * You should have received a copy of the GNU General Public License
2N/A * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
2N/A */
2N/A
2N/A#include <grub/dl.h>
2N/A#include <grub/misc.h>
2N/A#include <grub/file.h>
2N/A#include <grub/efi/efi.h>
2N/A#include <grub/pci.h>
2N/A#include <grub/command.h>
2N/A#include <grub/i18n.h>
2N/A
2N/AGRUB_MOD_LICENSE ("GPLv3+");
2N/A
2N/Astatic grub_efi_guid_t acpi_guid = GRUB_EFI_ACPI_TABLE_GUID;
2N/Astatic grub_efi_guid_t acpi2_guid = GRUB_EFI_ACPI_20_TABLE_GUID;
2N/Astatic grub_efi_guid_t smbios_guid = GRUB_EFI_SMBIOS_TABLE_GUID;
2N/A
2N/A#define EBDA_SEG_ADDR 0x40e
2N/A#define LOW_MEM_ADDR 0x413
2N/A#define FAKE_EBDA_SEG 0x9fc0
2N/A
2N/A#define BLANK_MEM 0xffffffff
2N/A#define VBIOS_ADDR 0xc0000
2N/A#define SBIOS_ADDR 0xf0000
2N/A
2N/Astatic int
2N/Aenable_rom_area (void)
2N/A{
2N/A grub_pci_address_t addr;
2N/A grub_uint32_t *rom_ptr;
2N/A grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0};
2N/A
2N/A rom_ptr = (grub_uint32_t *) VBIOS_ADDR;
2N/A if (*rom_ptr != BLANK_MEM)
2N/A {
2N/A grub_puts_ (N_("ROM image is present."));
2N/A return 0;
2N/A }
2N/A
2N/A /* FIXME: should be macroified. */
2N/A addr = grub_pci_make_address (dev, 144);
2N/A grub_pci_write_byte (addr++, 0x30);
2N/A grub_pci_write_byte (addr++, 0x33);
2N/A grub_pci_write_byte (addr++, 0x33);
2N/A grub_pci_write_byte (addr++, 0x33);
2N/A grub_pci_write_byte (addr++, 0x33);
2N/A grub_pci_write_byte (addr++, 0x33);
2N/A grub_pci_write_byte (addr++, 0x33);
2N/A grub_pci_write_byte (addr, 0);
2N/A
2N/A *rom_ptr = 0;
2N/A if (*rom_ptr != 0)
2N/A {
2N/A grub_puts_ (N_("Can\'t enable ROM area."));
2N/A return 0;
2N/A }
2N/A
2N/A return 1;
2N/A}
2N/A
2N/Astatic void
2N/Alock_rom_area (void)
2N/A{
2N/A grub_pci_address_t addr;
2N/A grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0};
2N/A
2N/A /* FIXME: should be macroified. */
2N/A addr = grub_pci_make_address (dev, 144);
2N/A grub_pci_write_byte (addr++, 0x10);
2N/A grub_pci_write_byte (addr++, 0x11);
2N/A grub_pci_write_byte (addr++, 0x11);
2N/A grub_pci_write_byte (addr++, 0x11);
2N/A grub_pci_write_byte (addr, 0x11);
2N/A}
2N/A
2N/Astatic void
2N/Afake_bios_data (int use_rom)
2N/A{
2N/A unsigned i;
2N/A void *acpi, *smbios;
2N/A grub_uint16_t *ebda_seg_ptr, *low_mem_ptr;
2N/A
2N/A ebda_seg_ptr = (grub_uint16_t *) EBDA_SEG_ADDR;
2N/A low_mem_ptr = (grub_uint16_t *) LOW_MEM_ADDR;
2N/A if ((*ebda_seg_ptr) || (*low_mem_ptr))
2N/A return;
2N/A
2N/A acpi = 0;
2N/A smbios = 0;
2N/A for (i = 0; i < grub_efi_system_table->num_table_entries; i++)
2N/A {
2N/A grub_efi_guid_t *guid =
2N/A &grub_efi_system_table->configuration_table[i].vendor_guid;
2N/A
2N/A if (! grub_memcmp (guid, &acpi2_guid, sizeof (grub_efi_guid_t)))
2N/A {
2N/A acpi = grub_efi_system_table->configuration_table[i].vendor_table;
2N/A grub_dprintf ("efi", "ACPI2: %p\n", acpi);
2N/A }
2N/A else if (! grub_memcmp (guid, &acpi_guid, sizeof (grub_efi_guid_t)))
2N/A {
2N/A void *t;
2N/A
2N/A t = grub_efi_system_table->configuration_table[i].vendor_table;
2N/A if (! acpi)
2N/A acpi = t;
2N/A grub_dprintf ("efi", "ACPI: %p\n", t);
2N/A }
2N/A else if (! grub_memcmp (guid, &smbios_guid, sizeof (grub_efi_guid_t)))
2N/A {
2N/A smbios = grub_efi_system_table->configuration_table[i].vendor_table;
2N/A grub_dprintf ("efi", "SMBIOS: %p\n", smbios);
2N/A }
2N/A }
2N/A
2N/A *ebda_seg_ptr = FAKE_EBDA_SEG;
2N/A *low_mem_ptr = (FAKE_EBDA_SEG >> 6);
2N/A
2N/A *((grub_uint16_t *) (FAKE_EBDA_SEG << 4)) = 640 - *low_mem_ptr;
2N/A
2N/A if (acpi)
2N/A grub_memcpy ((char *) ((FAKE_EBDA_SEG << 4) + 16), acpi, 1024 - 16);
2N/A
2N/A if ((use_rom) && (smbios))
2N/A grub_memcpy ((char *) SBIOS_ADDR, (char *) smbios + 16, 16);
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_cmd_fakebios (struct grub_command *cmd __attribute__ ((unused)),
2N/A int argc __attribute__ ((unused)),
2N/A char *argv[] __attribute__ ((unused)))
2N/A{
2N/A if (enable_rom_area ())
2N/A {
2N/A fake_bios_data (1);
2N/A lock_rom_area ();
2N/A }
2N/A else
2N/A fake_bios_data (0);
2N/A
2N/A return 0;
2N/A}
2N/A
2N/Astatic grub_err_t
2N/Agrub_cmd_loadbios (grub_command_t cmd __attribute__ ((unused)),
2N/A int argc, char *argv[])
2N/A{
2N/A grub_file_t file;
2N/A int size;
2N/A
2N/A if (argc == 0)
2N/A return grub_error (GRUB_ERR_BAD_ARGUMENT, "no ROM image specified");
2N/A
2N/A if (argc > 1)
2N/A {
2N/A file = grub_file_open (argv[1]);
2N/A if (! file)
2N/A return grub_errno;
2N/A
2N/A if (file->size != 4)
2N/A grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid int10 dump size");
2N/A else
2N/A grub_file_read (file, (void *) 0x40, 4);
2N/A
2N/A grub_file_close (file);
2N/A if (grub_errno)
2N/A return grub_errno;
2N/A }
2N/A
2N/A file = grub_file_open (argv[0]);
2N/A if (! file)
2N/A return grub_errno;
2N/A
2N/A size = file->size;
2N/A if ((size < 0x10000) || (size > 0x40000))
2N/A grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid bios dump size");
2N/A else if (enable_rom_area ())
2N/A {
2N/A grub_file_read (file, (void *) VBIOS_ADDR, size);
2N/A fake_bios_data (size <= 0x40000);
2N/A lock_rom_area ();
2N/A }
2N/A
2N/A grub_file_close (file);
2N/A return grub_errno;
2N/A}
2N/A
2N/Astatic grub_command_t cmd_fakebios, cmd_loadbios;
2N/A
2N/AGRUB_MOD_INIT(loadbios)
2N/A{
2N/A cmd_fakebios = grub_register_command ("fakebios", grub_cmd_fakebios,
2N/A 0, N_("Fake BIOS."));
2N/A
2N/A cmd_loadbios = grub_register_command ("loadbios", grub_cmd_loadbios,
2N/A N_("BIOS_DUMP [INT10_DUMP]"),
2N/A N_("Load BIOS dump."));
2N/A}
2N/A
2N/AGRUB_MOD_FINI(loadbios)
2N/A{
2N/A grub_unregister_command (cmd_fakebios);
2N/A grub_unregister_command (cmd_loadbios);
2N/A}