Add support for GPT partition schema

blk/components/blk_components.mk

@@ -22,18 +22,23 @@ ${CHECK_BLK_FLAGS_MD5}:
 	touch $@
 
 
-blk_virt.elf: blk_virt.o
+blk_virt.elf: blk_virt.o blk_partitioning.o
 	$(LD) $(LDFLAGS) $^ $(LIBS) -o $@
 
 blk_virt.o: ${CHECK_BLK_FLAGS_MD5}
 blk_virt.o: ${SDDF}/blk/components/virt.c
+	${CC} ${CFLAGS} -I${SDDF}/blk/components ${CFLAGS_blk} -o $@ -c $<
+
+blk_partitioning.o: ${CHECK_BLK_FLAGS_MD5}
+blk_partitioning.o: ${SDDF}/blk/components/partitioning.c
 	${CC} ${CFLAGS} ${CFLAGS_blk} -o $@ -c $<
 
 clean::
-	rm -f blk_virt.[od] .blk_cflags-*
+	rm -f blk_virt.[od] blk_partitioning.[od] .blk_cflags-*
 
 clobber::
 	rm -f ${BLK_IMAGES}
 
 
 -include blk_virt.d
+-include blk_partitioning.d

blk/components/gpt.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2024, UNSW
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+/**
+ * GUID Partition Table
+ *
+ * https://en.wikipedia.org/wiki/GUID_Partition_Table
+ * */
+
+#define GPT_MAX_PARTITIONS 128
+#define GPT_SECTOR_SIZE 512
+#define GPT_PARTITION_INFO_CODE 0x1
+#define GPT_PARTITION_INFO_MIRROR_CODE 0x2
+#define GPT_HEADER_SIGNATURE "EFI PART"
+
+struct gpt_partition_header {
+    char signature[8];
+    uint32_t revision;
+    uint32_t header_size;
+    uint32_t crc32_header;
+    uint32_t reserved;
+    uint64_t lba_header;
+    uint64_t lba_alt_header;
+    uint64_t block_first;
+    uint64_t block_last;
+    uint8_t guid[16];
+    uint64_t lba_start;
+    uint32_t num_entries;
+    uint32_t entry_size;
+    uint32_t crc32_entry_array;
+} __attribute__((packed));
+
+struct gpt_partition_entry {
+    uint8_t guid_type[16];
+    uint8_t guid_unique[16];
+    uint64_t lba_start;
+    uint64_t lba_end;
+    uint64_t attributes;
+    char name[72];
+} __attribute__((packed));

include/sddf/blk/msdos_mbr.h → blk/components/msdos_mbr.h

@@ -33,3 +33,4 @@ struct msdos_mbr {
 } __attribute__((packed));
 
 #define MSDOS_MBR_PARTITION_TYPE_EMPTY 0x00
+#define MSDOS_MBR_PARTITION_TYPE_GPT 0xEE