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Annotation of Gnu-Mach/i386/i386at/acpi.c, revision 1.1

1.1     ! root        1: /* acpi.c - get acpi tables. */
        !             2: /*
        !             3:  *  GRUB  --  GRand Unified Bootloader
        !             4:  *  Copyright (C) 2009  Free Software Foundation, Inc.
        !             5:  *
        !             6:  *  GRUB is free software: you can redistribute it and/or modify
        !             7:  *  it under the terms of the GNU General Public License as published by
        !             8:  *  the Free Software Foundation, either version 3 of the License, or
        !             9:  *  (at your option) any later version.
        !            10:  *
        !            11:  *  GRUB is distributed in the hope that it will be useful,
        !            12:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14:  *  GNU General Public License for more details.
        !            15:  *
        !            16:  *  You should have received a copy of the GNU General Public License
        !            17:  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
        !            18:  */
        !            19: 
        !            20: #include <grub/glue.h>
        !            21: #include <grub/acpi.h>
        !            22: #include <grub/misc.h>
        !            23: 
        !            24: struct grub_acpi_rsdp_v10 *
        !            25: grub_machine_acpi_get_rsdpv1 (void)
        !            26: {
        !            27:   int ebda_len;
        !            28:   grub_uint8_t *ebda, *ptr;
        !            29: 
        !            30:   grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
        !            31:   ebda = (grub_uint8_t *) phystokv ((* ((grub_uint16_t *) phystokv (0x40e))) << 4);
        !            32:   ebda_len = * (grub_uint16_t *) ebda;
        !            33:   if (! ebda_len)
        !            34:     return 0;
        !            35:   for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
        !            36:     if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
        !            37:        && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
        !            38:        && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
        !            39:       return (struct grub_acpi_rsdp_v10 *) ptr;
        !            40: 
        !            41:   grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
        !            42:   for (ptr = (grub_uint8_t *) phystokv (0xe0000); ptr < (grub_uint8_t *) phystokv (0x100000);
        !            43:        ptr += 16)
        !            44:     if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
        !            45:        && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
        !            46:        && ((struct grub_acpi_rsdp_v10 *) ptr)->revision == 0)
        !            47:       return (struct grub_acpi_rsdp_v10 *) ptr;
        !            48:   return 0;
        !            49: }
        !            50: 
        !            51: struct grub_acpi_rsdp_v20 *
        !            52: grub_machine_acpi_get_rsdpv2 (void)
        !            53: {
        !            54:   int ebda_len;
        !            55:   grub_uint8_t *ebda, *ptr;
        !            56: 
        !            57:   grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
        !            58:   ebda = (grub_uint8_t *) phystokv ((* ((grub_uint16_t *) phystokv (0x40e))) << 4);
        !            59:   ebda_len = * (grub_uint16_t *) ebda;
        !            60:   if (! ebda_len)
        !            61:     return 0;
        !            62:   for (ptr = ebda; ptr < ebda + 0x400; ptr += 16)
        !            63:     if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
        !            64:        && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
        !            65:        && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
        !            66:        && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
        !            67:        && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
        !            68:        == 0)
        !            69:       return (struct grub_acpi_rsdp_v20 *) ptr;
        !            70: 
        !            71:   grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
        !            72:   for (ptr = (grub_uint8_t *) phystokv (0xe0000); ptr < (grub_uint8_t *) phystokv (0x100000);
        !            73:        ptr += 16)
        !            74:     if (grub_memcmp (ptr, GRUB_RSDP_SIGNATURE, GRUB_RSDP_SIGNATURE_SIZE) == 0
        !            75:        && grub_byte_checksum (ptr, sizeof (struct grub_acpi_rsdp_v10)) == 0
        !            76:        && ((struct grub_acpi_rsdp_v10 *) ptr)->revision != 0
        !            77:        && ((struct grub_acpi_rsdp_v20 *) ptr)->length < 1024
        !            78:        && grub_byte_checksum (ptr, ((struct grub_acpi_rsdp_v20 *) ptr)->length)
        !            79:        == 0)
        !            80:       return (struct grub_acpi_rsdp_v20 *) ptr;
        !            81:   return 0;
        !            82: }

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