pc-bios/s390-ccw: rename MAX_TABLE_ENTRIES to MAX_BOOT_ENTRIES

The MAX_TABLE_ENTRIES constant has a name that is too generic. As we
want to declare a limit for boot menu entries, let's rename it to a more
fitting MAX_BOOT_ENTRIES and set its value to 31 (30 boot entries and
1 default entry). Also we move it from bootmap.h to s390-ccw.h to make
it available for menu.c in a later patch.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

pc-bios/s390-ccw/bootmap.c

@@ -297,7 +297,7 @@ static void run_eckd_boot_script(block_number_t bmt_block_nr,
     }
 
     debug_print_int("loadparm", loadparm);
-    IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than"
+    IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than"
                " maximum number of boot entries allowed");
 
     memset(sec, FREE_SPACE_FILLER, sizeof(sec));
@@ -585,7 +585,7 @@ static void ipl_scsi(void)
     read_block(mbr->pt.blockno, sec, "Error reading Program Table");
     IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT");
 
-    while (program_table_entries <= MAX_TABLE_ENTRIES) {
+    while (program_table_entries < MAX_BOOT_ENTRIES) {
         if (!prog_table->entry[program_table_entries].scsi.blockno) {
             break;
         }
@@ -600,7 +600,7 @@ static void ipl_scsi(void)
     }
 
     debug_print_int("loadparm", loadparm);
-    IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than"
+    IPL_assert(loadparm < MAX_BOOT_ENTRIES, "loadparm value greater than"
                " maximum number of boot entries allowed");
 
     zipl_run(&prog_table->entry[loadparm].scsi); /* no return */

pc-bios/s390-ccw/bootmap.h

@@ -57,8 +57,6 @@ typedef union BootMapPointer {
     ExtEckdBlockPtr xeckd;
 } __attribute__ ((packed)) BootMapPointer;
 
-#define MAX_TABLE_ENTRIES  30
-
 /* aka Program Table */
 typedef struct BootMapTable {
     uint8_t magic[4];

pc-bios/s390-ccw/s390-ccw.h

@@ -94,6 +94,8 @@ bool menu_is_enabled_zipl(void);
 int menu_get_enum_boot_index(int entries);
 bool menu_is_enabled_enum(void);
 
+#define MAX_BOOT_ENTRIES  31
+
 static inline void fill_hex(char *out, unsigned char val)
 {
     const char hex[] = "0123456789abcdef";