[Xen-devel] [PATCH RESEND] blktap3/part: Introduce partition header

[Thanos Makatos <thanos.makatos@xxxxxxxxxx>]

This patch introduces partition structs and public functions. This file is
imported from blktap2.5. I haven't looked thoroughly into this file, it seems
to be used by libvhd to access partition tables inside VHD files.

Signed-off-by: Thanos Makatos <thanos.makatos@xxxxxxxxxx>

diff --git a/tools/blktap3/part/partition.h b/tools/blktap3/part/partition.h
new file mode 100644
--- /dev/null
+++ b/tools/blktap3/part/partition.h
@@ -0,0 +1,45 @@
+#ifndef _PARTITION_H_
+#define _PARTITION_H_
+
+#include <inttypes.h>
+
+#define PARTITION_BOOTABLE            0x80
+#define PARTITION_NON_BOOTABLE        0x00
+
+#define MBR_SIGNATURE                 0xAA55
+#define MBR_START_SECTOR              0x80
+
+struct partition_geometry {
+    unsigned char heads;
+    unsigned char sectors;
+    unsigned int cylinders;
+};
+
+struct partition_chs {
+    uint8_t chs[3];
+} __attribute__ ((__packed__));
+
+struct primary_partition {
+    uint8_t status;
+    struct partition_chs chs_first;
+    uint8_t type;
+    struct partition_chs chs_last;
+    uint32_t lba;
+    uint32_t blocks;
+} __attribute__ ((__packed__));
+
+struct partition_table {
+    uint8_t code[0x1b8];
+    uint32_t disk_signature;
+    uint8_t pad[0x2];
+    struct primary_partition partitions[4];
+    uint16_t mbr_signature;
+} __attribute__ ((__packed__));
+
+void partition_table_in(struct partition_table *);
+void partition_table_out(struct partition_table *);
+int partition_table_validate(struct partition_table *);
+void partition_table_dump(struct partition_table *);
+struct partition_chs lba_to_chs(struct partition_geometry *, uint64_t);
+
+#endif

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