136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
/*
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* VAS_EBOOT -- GRand Unified Bootloader
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* Copyright (C) 2012 Free Software Foundation, Inc.
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*
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* VAS_EBOOT 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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* VAS_EBOOT 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 VAS_EBOOT. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <VasEBoot/types.h>
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#include <VasEBoot/time.h>
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#include <VasEBoot/misc.h>
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#include <VasEBoot/mm.h>
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#include <VasEBoot/acpi.h>
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/* Simple checksum by summing all bytes. Used by ACPI and SMBIOS. */
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VasEBoot_uint8_t
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VasEBoot_byte_checksum (void *base, VasEBoot_size_t size)
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{
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VasEBoot_uint8_t *ptr;
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VasEBoot_uint8_t ret = 0;
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for (ptr = (VasEBoot_uint8_t *) base; ptr < ((VasEBoot_uint8_t *) base) + size;
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ptr++)
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ret += *ptr;
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return ret;
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}
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static void *
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VasEBoot_acpi_rsdt_find_table (struct VasEBoot_acpi_table_header *rsdt, const char *sig)
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{
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VasEBoot_size_t s;
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VasEBoot_unaligned_uint32_t *ptr;
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if (!rsdt)
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return 0;
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if (VasEBoot_memcmp (rsdt->signature, "RSDT", 4) != 0)
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return 0;
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ptr = (VasEBoot_unaligned_uint32_t *) (rsdt + 1);
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s = (rsdt->length - sizeof (*rsdt)) / sizeof (VasEBoot_uint32_t);
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for (; s; s--, ptr++)
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{
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struct VasEBoot_acpi_table_header *tbl;
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/* Skip NULL entries in RSDT/XSDT. */
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if (!ptr->val)
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continue;
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tbl = (struct VasEBoot_acpi_table_header *) (VasEBoot_addr_t) ptr->val;
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if (VasEBoot_memcmp (tbl->signature, sig, 4) == 0)
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return tbl;
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}
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return 0;
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}
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static void *
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VasEBoot_acpi_xsdt_find_table (struct VasEBoot_acpi_table_header *xsdt, const char *sig)
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{
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VasEBoot_size_t s;
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VasEBoot_unaligned_uint64_t *ptr;
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if (!xsdt)
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return 0;
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if (VasEBoot_memcmp (xsdt->signature, "XSDT", 4) != 0)
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return 0;
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ptr = (VasEBoot_unaligned_uint64_t *) (xsdt + 1);
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s = (xsdt->length - sizeof (*xsdt)) / sizeof (VasEBoot_uint64_t);
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for (; s; s--, ptr++)
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{
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struct VasEBoot_acpi_table_header *tbl;
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/* Skip NULL entries in RSDT/XSDT. */
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if (!ptr->val)
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continue;
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#if VAS_EBOOT_CPU_SIZEOF_VOID_P != 8
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if (ptr->val >> 32)
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continue;
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#endif
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tbl = (struct VasEBoot_acpi_table_header *) (VasEBoot_addr_t) ptr->val;
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if (VasEBoot_memcmp (tbl->signature, sig, 4) == 0)
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return tbl;
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}
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return 0;
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}
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void *
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VasEBoot_acpi_find_table (const char *sig)
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{
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struct VasEBoot_acpi_fadt *r = NULL;
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struct VasEBoot_acpi_rsdp_v10 *rsdpv1;
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struct VasEBoot_acpi_rsdp_v20 *rsdpv2;
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rsdpv1 = VasEBoot_machine_acpi_get_rsdpv1 ();
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if (rsdpv1)
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r = VasEBoot_acpi_rsdt_find_table ((struct VasEBoot_acpi_table_header *)
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(VasEBoot_addr_t) rsdpv1->rsdt_addr,
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sig);
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if (r)
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return r;
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rsdpv2 = VasEBoot_machine_acpi_get_rsdpv2 ();
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if (rsdpv2
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#if VAS_EBOOT_CPU_SIZEOF_VOID_P != 8
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&& !(rsdpv2->xsdt_addr >> 32)
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#endif
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)
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r = VasEBoot_acpi_xsdt_find_table ((struct VasEBoot_acpi_table_header *)
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(VasEBoot_addr_t) rsdpv2->xsdt_addr,
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sig);
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if (r)
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return r;
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if (rsdpv2)
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r = VasEBoot_acpi_rsdt_find_table ((struct VasEBoot_acpi_table_header *)
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(VasEBoot_addr_t) rsdpv2->rsdpv1.rsdt_addr,
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sig);
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if (r)
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return r;
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return 0;
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}
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struct VasEBoot_acpi_fadt *
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VasEBoot_acpi_find_fadt (void)
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{
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return VasEBoot_acpi_find_table (VAS_EBOOT_ACPI_FADT_SIGNATURE);
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}
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