s390-ccw: refactor boot map table code

Some ECKD bootmap code was using structs designed for SCSI.
Even though this works, it confuses readability. Add a new
BootMapTable struct to assist with readability in bootmap
entry code. Also:

- replace ScsiMbr in ECKD code with appropriate structs
- fix read_block messages to reflect BootMapTable
- fixup ipl_scsi to use BootMapTable (referred to as Program Table)
- defined value for maximum table entries

Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/pc-bios/s390-ccw/bootmap.h b/pc-bios/s390-ccw/bootmap.h
index cf99a4c728..486c0f34f1 100644
--- a/pc-bios/s390-ccw/bootmap.h
+++ b/pc-bios/s390-ccw/bootmap.h
@@ -53,6 +53,15 @@ typedef union BootMapPointer {
     ExtEckdBlockPtr xeckd;
 } __attribute__ ((packed)) BootMapPointer;
 
+#define MAX_TABLE_ENTRIES  30
+
+/* aka Program Table */
+typedef struct BootMapTable {
+    uint8_t magic[4];
+    uint8_t reserved[12];
+    BootMapPointer entry[];
+} __attribute__ ((packed)) BootMapTable;
+
 typedef struct ComponentEntry {
     ScsiBlockPtr data;
     uint8_t pad[7];
@@ -70,7 +79,7 @@ typedef struct ScsiMbr {
     uint8_t magic[4];
     uint32_t version_id;
     uint8_t reserved[8];
-    ScsiBlockPtr blockptr[];
+    ScsiBlockPtr pt;   /* block pointer to program table */
 } __attribute__ ((packed)) ScsiMbr;
 
 #define ZIPL_MAGIC              "zIPL"