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0df2b57ae9
This ACPI table contains a flag that is used for indicating pre-boot DMA protection on AMD systems.
105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/*
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* Copyright (C) 2020 Richard Hughes <richard@hughsie.com>
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* Copyright (C) 2022 Mario Limonciello <mario.limonciello@amd.com>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#include "config.h"
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#include <fwupdplugin.h>
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#include <string.h>
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#include "fu-acpi-ivrs.h"
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struct _FuAcpiIvrs {
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GObject parent_instance;
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gboolean remap_support;
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};
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G_DEFINE_TYPE(FuAcpiIvrs, fu_acpi_ivrs, G_TYPE_OBJECT)
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/* IVINfo field */
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#define IVRS_DMA_REMAP_SUPPORT_FLAG 0x2
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FuAcpiIvrs *
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fu_acpi_ivrs_new(GBytes *blob, GError **error)
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{
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FuAcpiIvrs *self = g_object_new(FU_TYPE_ACPI_IVRS, NULL);
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gchar creator_id[5] = {'\0'};
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gchar oem_table_id[9] = {'\0'};
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gchar signature[5] = {'\0'};
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gsize bufsz = 0;
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guint8 ivinfo = 0;
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const guint8 *buf = g_bytes_get_data(blob, &bufsz);
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/* parse table */
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if (!fu_memcpy_safe((guint8 *)signature,
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sizeof(signature),
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0x0, /* dst */
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buf,
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bufsz,
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0x00, /* src */
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sizeof(signature) - 1,
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error))
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return NULL;
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if (strcmp(signature, "IVRS") != 0) {
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g_set_error(error,
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G_IO_ERROR,
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G_IO_ERROR_NOT_SUPPORTED,
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"Not a IVRS table, got %s",
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signature);
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return NULL;
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}
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if (!fu_memcpy_safe((guint8 *)oem_table_id,
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sizeof(oem_table_id),
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0x0, /* dst */
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buf,
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bufsz,
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0x10, /* src */
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sizeof(oem_table_id) - 1,
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error))
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return NULL;
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g_debug("OemTableId: %s", oem_table_id);
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if (!fu_memcpy_safe((guint8 *)creator_id,
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sizeof(creator_id),
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0x0, /* dst */
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buf,
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bufsz,
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0x1c, /* src */
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sizeof(creator_id) - 1,
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error))
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return NULL;
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g_debug("CreatorId: %s", creator_id);
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if (!fu_memcpy_safe(&ivinfo,
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sizeof(ivinfo),
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0x0, /* dst */
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buf,
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bufsz,
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0x24, /* src */
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sizeof(ivinfo),
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error))
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return NULL;
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g_debug("Flags: 0x%02x", ivinfo);
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self->remap_support = ivinfo & IVRS_DMA_REMAP_SUPPORT_FLAG;
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return self;
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}
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gboolean
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fu_acpi_ivrs_get_dma_remap(FuAcpiIvrs *self)
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{
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g_return_val_if_fail(FU_IS_ACPI_IVRS(self), FALSE);
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return self->remap_support;
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}
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static void
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fu_acpi_ivrs_class_init(FuAcpiIvrsClass *klass)
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{
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}
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static void
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fu_acpi_ivrs_init(FuAcpiIvrs *self)
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{
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}
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