d43a5ee651
PIT isn't available on some of new hardware including Hyper-V. So use pmtimer for calibration. Moreover pmtimer calibration is faster, so use it on coreboor where booting time is important. Based on patch by Michael Chang.
83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/* acpi.c - get acpi tables. */
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/*
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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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#include <grub/acpi.h>
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#include <grub/misc.h>
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struct grub_acpi_rsdp_v10 *
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grub_machine_acpi_get_rsdpv1 (void)
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{
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int ebda_len;
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grub_uint8_t *ebda, *ptr;
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grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
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ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
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ebda_len = * (grub_uint16_t *) ebda;
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if (! ebda_len) /* FIXME do we really need this check? */
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goto scan_bios;
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for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
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if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
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&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
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&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
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return (struct grub_acpi_rsdp_v10 *) ptr;
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scan_bios:
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grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
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for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
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ptr += 16)
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if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
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&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
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&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
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return (struct grub_acpi_rsdp_v10 *) ptr;
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return 0;
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}
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struct grub_acpi_rsdp_v20 *
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grub_machine_acpi_get_rsdpv2 (void)
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{
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int ebda_len;
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grub_uint8_t *ebda, *ptr;
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grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
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ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
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ebda_len = * (grub_uint16_t *) ebda;
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if (! ebda_len) /* FIXME do we really need this check? */
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goto scan_bios;
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for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
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if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
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&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
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&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
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&& ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
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&& grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
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== 0)
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return (struct grub_acpi_rsdp_v20 *) ptr;
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scan_bios:
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grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
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for (ptr = (grub_uint8_t *) 0xe0000; ptr < (grub_uint8_t *) 0x100000;
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ptr += 16)
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if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
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&& grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
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&& ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
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&& ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
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&& grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
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== 0)
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return (struct grub_acpi_rsdp_v20 *) ptr;
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return 0;
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}
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