[PATCH 10/12] sbbr/xsdt: Add initial tests to xsdt acpi table as per sbbr.

[Supreeth Venkatesh]

Server Base Boot Requirements (SBBR) specification is intended for SBSA-
compliant 64-bit ARMv8 servers.
It defines the base firmware requirements for out-of-box support of any
ARM SBSA-compatible Operating System or hypervisor.
The requirements in this specification are expected to be minimal yet
complete for booting a multi-core ARMv8 server platform, while leaving
plenty of room for OEM or ODM innovations and design details.
For more information, download the SBBR specification here:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0044b/index.html

This change introduces test cases as per SBBR specification to xsdt acpi
table. These test cases may be subset/superset of xsdt  acpi table tests
already existing. However, to preserve "sbbr" classification, new file
is created, even when most of the code is re-used from acpi/xsdt.

Signed-off-by: Supreeth Venkatesh <supreeth.venkatesh at arm.com>
---
 src/sbbr/xsdt/xsdt.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/sbbr/xsdt/xsdt.c

diff --git a/src/sbbr/xsdt/xsdt.c b/src/sbbr/xsdt/xsdt.c
new file mode 100644
index 0000000..7d4aaec
--- /dev/null
+++ b/src/sbbr/xsdt/xsdt.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2015-2017 Canonical
+ * Copyright (C) 2017 ARM Ltd
+ *
+ * Portions of this code original from the Linux-ready Firmware Developer Kit
+ *
+ * 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_SBBR)
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+
+static fwts_acpi_table_info *table;
+
+static int sbbr_xsdt_init(fwts_framework *fw)
+{
+	if (fwts_acpi_find_table(fw, "XSDT", 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 XSDT table does not exist.");
+		return FWTS_ERROR;
+	}
+	return FWTS_OK;
+}
+
+/*
+ *  XSDT Extended System Description Table
+ */
+static int sbbr_xsdt_test1(fwts_framework *fw)
+{
+	fwts_acpi_table_xsdt *xsdt = (fwts_acpi_table_xsdt*)table->data;
+	size_t i, n;
+	bool passed = true;
+
+	n = (table->length - sizeof(fwts_acpi_table_header)) / sizeof(uint64_t);
+	for (i = 0; i < n; i++) {
+		if (xsdt->entries[i] == 0) {
+			passed = false;
+			fwts_failed(fw, LOG_LEVEL_CRITICAL,
+				"XSDTEntryNull",
+				"XSDT Entry %zd is null, should not be non-zero.", i);
+			fwts_advice(fw,
+				"A XSDT pointer is null and therefore erroneously "
+				"points to an invalid 64 bit ACPI table header. "
+				"At worse this will cause the kernel to oops, at "
+				"best the kernel may ignore this.  However, it "
+				"should be fixed where possible.");
+		}
+	}
+	if (passed)
+		fwts_passed(fw, "XSDT is present, pointed at by XsdrAddress=0x%lx and contain valid pointers to %d other ACPI tables mandated by SBBR", xsdt->entries[0], (int)n);
+
+	return FWTS_OK;
+}
+
+static fwts_framework_minor_test sbbr_xsdt_tests[] = {
+	{ sbbr_xsdt_test1, "XSDT Extended System Description Table test." },
+	{ NULL, NULL }
+};
+
+static fwts_framework_ops sbbr_xsdt_ops = {
+	.description = "XSDT Extended System Description Table test.",
+	.init        = sbbr_xsdt_init,
+	.minor_tests = sbbr_xsdt_tests
+};
+
+FWTS_REGISTER("sbbr_xsdt", &sbbr_xsdt_ops, FWTS_TEST_ANYTIME, FWTS_FLAG_TEST_SBBR)
+
+#endif
-- 
2.7.4