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65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* Copyright (C) 2020 Richard Hughes <richard@hughsie.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 "fu-acpi-dmar.h"
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struct _FuAcpiDmar {
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FuAcpiTable parent_instance;
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gboolean opt_in;
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};
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G_DEFINE_TYPE(FuAcpiDmar, fu_acpi_dmar, FU_TYPE_ACPI_TABLE)
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#define DMAR_DMA_CTRL_PLATFORM_OPT_IN_FLAG 0x4
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FuAcpiDmar *
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fu_acpi_dmar_new(GBytes *blob, GError **error)
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{
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FuAcpiDmar *self = g_object_new(FU_TYPE_ACPI_DMAR, NULL);
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gsize bufsz = 0;
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guint8 flags = 0;
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const guint8 *buf = g_bytes_get_data(blob, &bufsz);
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/* FuAcpiTable->parse */
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if (!FU_FIRMWARE_CLASS(fu_acpi_dmar_parent_class)
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->parse(FU_FIRMWARE(self), blob, 0x0, FWUPD_INSTALL_FLAG_NONE, error))
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return NULL;
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/* check signature and read flags */
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if (g_strcmp0(fu_firmware_get_id(FU_FIRMWARE(self)), "DMAR") != 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 DMAR table, got %s",
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fu_firmware_get_id(FU_FIRMWARE(self)));
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return NULL;
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}
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if (!fu_memread_uint8_safe(buf, bufsz, 0x25, &flags, error))
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return NULL;
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g_debug("Flags: 0x%02x", flags);
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self->opt_in = (flags & DMAR_DMA_CTRL_PLATFORM_OPT_IN_FLAG) > 0;
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return self;
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}
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gboolean
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fu_acpi_dmar_get_opt_in(FuAcpiDmar *self)
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{
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g_return_val_if_fail(FU_IS_ACPI_DMAR(self), FALSE);
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return self->opt_in;
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}
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static void
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fu_acpi_dmar_class_init(FuAcpiDmarClass *klass)
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{
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}
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static void
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fu_acpi_dmar_init(FuAcpiDmar *self)
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{
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}
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