util: add smmstoretool for editing SMMSTORE

Offline SMMSTORE variable modification tool.  Can be used to
pre-configure ROM image or debug EFI state stored in a dump.

Change-Id: I6c1c06f1d0c39c13b5be76a3070f09b715aca6e0
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79080
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

util/smmstoretool/guids.c

@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "guids.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include <commonlib/bsd/helpers.h>
+
+#include "udk2017.h"
+#include "utils.h"
+
+const struct guid_alias_t known_guids[] = {
+	{
+		"coreboot",
+		{
+			0xceae4c1d, 0x335b, 0x4685,
+			{ 0xa4, 0xa0, 0xfc, 0x4a, 0x94, 0xee, 0xa0, 0x85 }
+		},
+	},
+	{
+		"dasharo",
+		{
+			0xd15b327e, 0xff2d, 0x4fc1,
+			{ 0xab, 0xf6, 0xc1, 0x2b, 0xd0, 0x8c, 0x13, 0x59 }
+		},
+	},
+	{
+		"global",
+		{
+			0x8be4df61, 0x93ca, 0x11d2,
+			{ 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c }
+		},
+	},
+	{
+		"microsoft",
+		{
+			0x77fa9abd, 0x0359, 0x4d32,
+			{ 0xbd, 0x60, 0x28, 0xf4, 0xe7, 0x8f, 0x78, 0x4b }
+		},
+	},
+};
+
+const int known_guid_count = ARRAY_SIZE(known_guids);
+
+char *format_guid(const EFI_GUID *guid, bool use_alias)
+{
+	if (use_alias) {
+		for (int i = 0; i < known_guid_count; ++i) {
+			const struct guid_alias_t *known_guid = &known_guids[i];
+			if (memcmp(&known_guid->guid, guid, sizeof(*guid)) == 0)
+				return strdup(known_guid->alias);
+		}
+	}
+
+	char *str = xmalloc(GUID_LEN + 1);
+	snprintf(str, GUID_LEN + 1,
+		 "%08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x",
+		 guid->Data1, guid->Data2, guid->Data3,
+		 guid->Data4[0], guid->Data4[1],
+		 guid->Data4[2], guid->Data4[3],
+		 guid->Data4[4], guid->Data4[5],
+		 guid->Data4[6], guid->Data4[7]);
+	return str;
+}
+
+bool parse_guid(const char str[], EFI_GUID *guid)
+{
+	for (int i = 0; i < known_guid_count; ++i) {
+		const struct guid_alias_t *known_guid = &known_guids[i];
+		if (str_eq(known_guid->alias, str)) {
+			*guid = known_guid->guid;
+			return true;
+		}
+	}
+
+	if (strlen(str) != GUID_LEN)
+		return false;
+
+	int n = sscanf(str,
+		       "%08x-%04hx-%04hx-"
+		       "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",
+		       &guid->Data1, &guid->Data2, &guid->Data3,
+		       &guid->Data4[0], &guid->Data4[1],
+		       &guid->Data4[2], &guid->Data4[3],
+		       &guid->Data4[4], &guid->Data4[5],
+		       &guid->Data4[6], &guid->Data4[7]);
+	return n == 11;
+}