firmware-utils/ptgen: set GPT partition attributes and name

Allow setting GPT partition names as used by TF-A bl2 to identify the
FIP volume to load from eMMC and SD-card.
While at it, also allow setting 'required' attribute as it should be
used for volumes which are essential for the system to boot.
Also properly handle setting the LEGACY_BOOT flag on the partition
selected as 'active', as this is how it is specified in the spec.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

tools/firmware-utils/src/ptgen.c

@@ -52,6 +52,8 @@
 #define swap(a, b) \
 	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
 
+#define BIT(_x)		(1UL << (_x))
+
 typedef struct {
 	uint8_t b[16];
 } guid_t;
@@ -80,11 +82,23 @@ typedef struct {
 	GUID_INIT( 0x21686148, 0x6449, 0x6E6F, \
 			0x74, 0x4E, 0x65, 0x65, 0x64, 0x45, 0x46, 0x49)
 
+#define GUID_PARTITION_LINUX_FIT_GUID \
+	GUID_INIT( 0xcae9be83, 0xb15f, 0x49cc, \
+			0x86, 0x3f, 0x08, 0x1b, 0x74, 0x4a, 0x2d, 0x93)
+
+#define GUID_PARTITION_LINUX_FS_GUID \
+	GUID_INIT( 0x0fc63daf, 0x8483, 0x4772, \
+			0x8e, 0x79, 0x3d, 0x69, 0xd8, 0x47, 0x7d, 0xe4)
+
 #define GPT_HEADER_SIZE         92
 #define GPT_ENTRY_SIZE          128
 #define GPT_ENTRY_MAX           128
 #define GPT_ENTRY_NAME_SIZE     72
 
+#define GPT_ATTR_PLAT_REQUIRED  BIT(0)
+#define GPT_ATTR_EFI_IGNORE     BIT(1)
+#define GPT_ATTR_LEGACY_BOOT    BIT(2)
+
 #define GPT_HEADER_SECTOR       1
 #define GPT_FIRST_ENTRY_SECTOR  2
 
@@ -109,6 +123,9 @@ struct partinfo {
 	unsigned long start;
 	unsigned long size;
 	int type;
+	char *name;
+	short int required;
+	guid_t guid;
 };
 
 /* GPT Partition table header */
@@ -294,7 +311,7 @@ static int gen_ptable(uint32_t signature, int nr)
 		if (parts[i].start != 0) {
 			if (parts[i].start * 2 < start) {
 				fprintf(stderr, "Invalid start %ld for partition %d!\n",
-					parts[i].start, i);
+					parts[i].start, i, start);
 				return ret;
 			}
 			start = parts[i].start * 2;
@@ -381,7 +398,7 @@ static int gen_gptable(uint32_t signature, guid_t guid, unsigned nr)
 		if (parts[i].start != 0) {
 			if (parts[i].start * 2 < start) {
 				fprintf(stderr, "Invalid start %ld for partition %d!\n",
-					parts[i].start, i);
+					parts[i].start, i, start);
 				return ret;
 			}
 			start = parts[i].start * 2;
@@ -396,12 +413,16 @@ static int gen_gptable(uint32_t signature, guid_t guid, unsigned nr)
 		gpte[i].end = cpu_to_le64(sect -1);
 		gpte[i].guid = guid;
 		gpte[i].guid.b[sizeof(guid_t) -1] += i + 1;
-		if (parts[i].type == 0xEF || (i + 1) == (unsigned)active) {
-			gpte[i].type = GUID_PARTITION_SYSTEM;
-			init_utf16("EFI System Partition", (uint16_t *)gpte[i].name, GPT_ENTRY_NAME_SIZE / sizeof(uint16_t));
-		} else {
-			gpte[i].type = GUID_PARTITION_BASIC_DATA;
-		}
+		gpte[i].type = parts[i].guid;
+
+		if (parts[i].name)
+			init_utf16(parts[i].name, (uint16_t *)gpte[i].name, GPT_ENTRY_NAME_SIZE / sizeof(uint16_t));
+
+		if ((i + 1) == (unsigned)active)
+			gpte[i].attr |= GPT_ATTR_LEGACY_BOOT;
+
+		if (parts[i].required)
+			gpte[i].attr |= GPT_ATTR_PLAT_REQUIRED;
 
 		if (verbose)
 			fprintf(stderr, "Partition %d: start=%" PRIu64 ", end=%" PRIu64 ", size=%"  PRIu64 "\n",
@@ -498,21 +519,44 @@ fail:
 
 static void usage(char *prog)
 {
-	fprintf(stderr, "Usage: %s [-v] [-n] [-g] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [-G <guid>] [[-t <type>] -p <size>[@<start>]...] \n", prog);
+	fprintf(stderr, "Usage: %s [-v] [-n] [-g] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [-G <guid>] [[-t <type>] [-r] [-N <name>] -p <size>[@<start>]...] \n", prog);
 	exit(EXIT_FAILURE);
 }
 
+static guid_t type_to_guid_and_name(unsigned char type, char **name)
+{
+	guid_t guid = GUID_PARTITION_BASIC_DATA;
+
+	switch (type) {
+		case 0xef:
+			*name = "EFI System Partition";
+			guid = GUID_PARTITION_SYSTEM;
+			break;
+		case 0x83:
+			guid = GUID_PARTITION_LINUX_FS_GUID;
+			break;
+		case 0x2e:
+			guid = GUID_PARTITION_LINUX_FIT_GUID;
+			break;
+	}
+
+	return guid;
+}
+
 int main (int argc, char **argv)
 {
 	unsigned char type = 0x83;
 	char *p;
 	int ch;
 	int part = 0;
+	char *name = NULL;
+	unsigned short int required = 0;
 	uint32_t signature = 0x5452574F; /* 'OWRT' */
 	guid_t guid = GUID_INIT( signature, 0x2211, 0x4433, \
 			0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0x00);
+	guid_t part_guid = GUID_PARTITION_BASIC_DATA;
 
-	while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vngl:S:G:")) != -1) {
+	while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vnN:gl:rS:G:")) != -1) {
 		switch (ch) {
 		case 'o':
 			filename = optarg;
@@ -543,11 +587,28 @@ int main (int argc, char **argv)
 				parts[part].start = to_kbytes(p);
 			}
 			parts[part].size = to_kbytes(optarg);
+			parts[part].required = required;
+			parts[part].name = name;
+			parts[part].guid = part_guid;
 			fprintf(stderr, "part %ld %ld\n", parts[part].start, parts[part].size);
 			parts[part++].type = type;
+			/*
+			 * reset 'name' and 'required'
+			 * 'type' is deliberately inherited from the previous delcaration
+			 */
+			name = NULL;
+			required = 0;
+			part_guid = type_to_guid_and_name(type, &name);
+			break;
+		case 'N':
+			name = optarg;
+			break;
+		case 'r':
+			required = 1;
 			break;
 		case 't':
 			type = (char)strtoul(optarg, NULL, 16);
+			part_guid = type_to_guid_and_name(type, &name);
 			break;
 		case 'a':
 			active = (int)strtoul(optarg, NULL, 0);