[PATCH 1/2] acpi: wsmt: add wsmt test according to ACPI 6.2 (mantis 1585)

[Alex Hung]

Signed-off-by: Alex Hung <alex.hung at canonical.com>
---
 src/Makefile.am             |  1 +
 src/acpi/wsmt/wsmt.c        | 94 +++++++++++++++++++++++++++++++++++++++++++++
 src/lib/include/fwts_acpi.h |  9 +++++
 3 files changed, 104 insertions(+)
 create mode 100644 src/acpi/wsmt/wsmt.c

diff --git a/src/Makefile.am b/src/Makefile.am
index e5537b4..ca0a449 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -117,6 +117,7 @@ fwts_SOURCES = main.c 				\
 	acpi/wdat/wdat.c			\
 	acpi/wmi/wmi.c 				\
 	acpi/wpbt/wpbt.c			\
+	acpi/wsmt/wsmt.c			\
 	acpi/xsdt/xsdt.c			\
 	acpi/xenv/xenv.c			\
 	apic/apicedge/apicedge.c 		\
diff --git a/src/acpi/wsmt/wsmt.c b/src/acpi/wsmt/wsmt.c
new file mode 100644
index 0000000..ad23fba
--- /dev/null
+++ b/src/acpi/wsmt/wsmt.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2017 Canonical
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+#include "fwts.h"
+
+#if defined(FWTS_HAS_ACPI)
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+#include <ctype.h>
+
+static fwts_acpi_table_info *table;
+
+static int wsmt_init(fwts_framework *fw)
+{
+	if (fwts_acpi_find_table(fw, "WSMT", 0, &table) != FWTS_OK) {
+		fwts_log_error(fw, "Cannot read ACPI tables.");
+		return FWTS_ERROR;
+	}
+	if (table == NULL || (table && table->length == 0)) {
+		fwts_log_error(fw, "ACPI WSMT table does not exist, skipping test");
+		return FWTS_SKIP;
+	}
+	return FWTS_OK;
+}
+
+/*
+ *  WSMT Windows Platform Binary Table
+ */
+static int wsmt_test1(fwts_framework *fw)
+{
+	fwts_acpi_table_wsmt *wsmt = (fwts_acpi_table_wsmt*) table->data;
+	bool passed = true;
+
+	fwts_log_info_verbatim(fw, "WSMT Windows SMM Security Mitigations Table:");
+	fwts_log_info_verbatim(fw, "  Protection Flags:      0x%8.8" PRIx32, wsmt->protection_flags);
+
+	if (wsmt->protection_flags & ~0x7) {
+		passed = false;
+		fwts_failed(fw, LOG_LEVEL_MEDIUM,
+			"WSMTFlagsReserved",
+			"WSMT Protection Flags reserved bits "
+			"[3:31] must be zero, instead got 0x%" PRIx32,
+			wsmt->protection_flags);
+	}
+
+	if ((wsmt->protection_flags & 0x2) && !(wsmt->protection_flags & 0x1)) {
+		passed = false;
+		fwts_failed(fw, LOG_LEVEL_MEDIUM,
+			"WSMTBadFlagsValue",
+			"WSMT Protection Flags bit[1] must be "
+			"set when bit[2] is set");
+	}
+
+	fwts_log_nl(fw);
+
+	if (passed)
+		fwts_passed(fw, "No issues found in WSMT table.");
+
+	return FWTS_OK;
+}
+
+static fwts_framework_minor_test wsmt_tests[] = {
+	{ wsmt_test1, "WSMT Windows SMM Security Mitigations Table test." },
+	{ NULL, NULL }
+};
+
+static fwts_framework_ops wsmt_ops = {
+	.description = "WSMT Windows SMM Security Mitigations Table test.",
+	.init        = wsmt_init,
+	.minor_tests = wsmt_tests
+};
+
+FWTS_REGISTER("wsmt", &wsmt_ops, FWTS_TEST_ANYTIME, FWTS_FLAG_BATCH | FWTS_FLAG_TEST_ACPI)
+
+#endif
diff --git a/src/lib/include/fwts_acpi.h b/src/lib/include/fwts_acpi.h
index f04d37a..bf318c2 100644
--- a/src/lib/include/fwts_acpi.h
+++ b/src/lib/include/fwts_acpi.h
@@ -1847,6 +1847,15 @@ typedef struct {
 } __attribute__ ((packed)) fwts_acpi_table_wpbt;
 
 /*
+ * ACPI WSMT (Windows SMM Security Mitigations Table)
+ *  https://msdn.microsoft.com/windows/hardware/drivers/bringup/acpi-system-description-tables#wsmt
+ */
+typedef struct {
+	fwts_acpi_table_header  header;
+	uint32_t	protection_flags;
+} __attribute__ ((packed)) fwts_acpi_table_wsmt;
+
+/*
  *  ACPI ASPT
  *	determined by reverse engineering
  */
-- 
2.7.4