| /* acpi.c - get acpi tables. */ |
| /* |
| * 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/>. |
| */ |
| |
| #include <grub/acpi.h> |
| #include <grub/misc.h> |
| |
| struct grub_acpi_rsdp_v10 * |
| grub_machine_acpi_get_rsdpv1 (void) |
| { |
| int ebda_len; |
| grub_uint8_t *ebda, *ptr; |
| |
| grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n"); |
| ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4); |
| ebda_len = * (grub_uint16_t *) ebda; |
| if (! ebda_len) /* FIXME do we really need this check? */ |
| goto scan_bios; |
| for (ptr = ebda; ptr < ebda + 0x400; ptr += 16) |
| if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 |
| && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 |
| && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0) |
| return (struct grub_acpi_rsdp_v10 *) ptr; |
| |
| scan_bios: |
| grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n"); |
| for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000; |
| ptr += 16) |
| if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 |
| && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 |
| && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0) |
| return (struct grub_acpi_rsdp_v10 *) ptr; |
| return 0; |
| } |
| |
| struct grub_acpi_rsdp_v20 * |
| grub_machine_acpi_get_rsdpv2 (void) |
| { |
| int ebda_len; |
| grub_uint8_t *ebda, *ptr; |
| |
| grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n"); |
| ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4); |
| ebda_len = * (grub_uint16_t *) ebda; |
| if (! ebda_len) /* FIXME do we really need this check? */ |
| goto scan_bios; |
| for (ptr = ebda; ptr < ebda + 0x400; ptr += 16) |
| if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 |
| && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 |
| && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0 |
| && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024 |
| && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length) |
| == 0) |
| return (struct grub_acpi_rsdp_v20 *) ptr; |
| |
| scan_bios: |
| grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n"); |
| for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000; |
| ptr += 16) |
| if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0 |
| && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0 |
| && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0 |
| && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024 |
| && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length) |
| == 0) |
| return (struct grub_acpi_rsdp_v20 *) ptr; |
| return 0; |
| } |