[PATCH 1/3] lib: fwts_acpi_tables: add a new function to check Reserved field

[Alex Hung]

Signed-off-by: Alex Hung <alex.hung at canonical.com>
---
 src/lib/include/fwts_acpi_tables.h |  2 ++
 src/lib/src/fwts_acpi_tables.c     | 44 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/src/lib/include/fwts_acpi_tables.h b/src/lib/include/fwts_acpi_tables.h
index 2527984..d478d99 100644
--- a/src/lib/include/fwts_acpi_tables.h
+++ b/src/lib/include/fwts_acpi_tables.h
@@ -53,6 +53,8 @@ bool fwts_acpi_obj_find(fwts_framework *fw, const char *obj_name);
 
 fwts_bool fwts_acpi_is_reduced_hardware(const fwts_acpi_table_fadt *fadt);
 
+void fwts_acpi_reserved_zero_check(fwts_framework *fw, const char *table, const char *field, uint64_t value, uint8_t size, bool *passed);
+
 #endif
 
 #endif
diff --git a/src/lib/src/fwts_acpi_tables.c b/src/lib/src/fwts_acpi_tables.c
index 3c3a63a..5a2450b 100644
--- a/src/lib/src/fwts_acpi_tables.c
+++ b/src/lib/src/fwts_acpi_tables.c
@@ -1383,4 +1383,48 @@ bool fwts_acpi_obj_find(fwts_framework *fw, const char *obj_name)
 	return found;
 }
 
+/*
+ *  fwts_acpi_reserved_zero_check()
+ *  verify whether the reserved field is zero
+ */
+void fwts_acpi_reserved_zero_check(
+	fwts_framework *fw,
+	const char *table,
+	const char *field,
+	uint64_t value,
+	uint8_t size,
+	bool *passed)
+{
+	if (value != 0) {
+		char *label = malloc(20);
+		strncpy(label, table, 4);	/* ACPI table name is 4 char long */
+		strncat(label, "ReservedNonZero", strlen("ReservedNonZero"));
+
+		switch (size) {
+		case sizeof(uint8_t):
+			fwts_failed(fw, LOG_LEVEL_MEDIUM, label,
+				"%4.4s %s field must be zero, got "
+				"0x%2.2" PRIx8 " instead", table, field, (uint8_t)value);
+			break;
+		case sizeof(uint16_t):
+			fwts_failed(fw, LOG_LEVEL_MEDIUM, label,
+				"%4.4s %s field must be zero, got "
+				"0x%4.4" PRIx16 " instead", table, field, (uint16_t)value);
+			break;
+		case sizeof(uint32_t):
+			fwts_failed(fw, LOG_LEVEL_MEDIUM, label,
+				"%4.4s %s field must be zero, got "
+				"0x%8.8" PRIx32 " instead", table, field, (uint32_t)value);
+			break;
+		case sizeof(uint64_t):
+			fwts_failed(fw, LOG_LEVEL_MEDIUM, label,
+				"%4.4s %s field must be zero, got "
+				"0x%16.16" PRIx64 " instead", table, field, value);
+			break;
+		}
+		*passed = false;
+		free(label);
+	}
+}
+
 #endif
-- 
2.7.4