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-rw-r--r--i386/i386at/acpi.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/i386/i386at/acpi.c b/i386/i386at/acpi.c
new file mode 100644
index 0000000..ec8aeb1
--- /dev/null
+++ b/i386/i386at/acpi.c
@@ -0,0 +1,82 @@
+/* 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/glue.h>
+#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 *) phystokv ((* ((grub_uint16_t *) phystokv (0x40e))) << 4);
+ ebda_len = * (grub_uint16_t *) ebda;
+ if (! ebda_len)
+ return 0;
+ 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;
+
+ grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
+ for (ptr = (grub_uint8_t *) phystokv (0xe0000); ptr < (grub_uint8_t *) phystokv (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 *) phystokv ((* ((grub_uint16_t *) phystokv (0x40e))) << 4);
+ ebda_len = * (grub_uint16_t *) ebda;
+ if (! ebda_len)
+ return 0;
+ 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;
+
+ grub_dprintf ("acpi", "Looking for RSDP. Scanning BIOS\n");
+ for (ptr = (grub_uint8_t *) phystokv (0xe0000); ptr < (grub_uint8_t *) phystokv (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;
+}