pc-bios/s390-ccw: fix non-sequential boot entries (enum)

zIPL boot menu entries can be non-sequential. Let's account
for this issue for the s390 enumerated boot menu. Since we
can no longer print a range of available entries to the
user, we have to present a list of each available entry.

An example of this menu:

  s390-ccw Enumerated Boot Menu.

   [0] default

   [1]
   [2]
   [7]
   [8]
   [9]
  [11]
  [12]

  Please choose:

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Reported-by: Vasily Gorbik <gor@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

@@ -565,6 +565,8 @@ static void ipl_scsi(void)
     int program_table_entries = 0;
     BootMapTable *prog_table = (void *)sec;
     unsigned int loadparm = get_loadparm_index();
+    bool valid_entries[MAX_BOOT_ENTRIES] = {false};
+    size_t i;
 
     /* Grab the MBR */
     memset(sec, FREE_SPACE_FILLER, sizeof(sec));
@@ -585,18 +587,18 @@ 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_BOOT_ENTRIES) {
-        if (!prog_table->entry[program_table_entries].scsi.blockno) {
-            break;
+    for (i = 0; i < MAX_BOOT_ENTRIES; i++) {
+        if (prog_table->entry[i].scsi.blockno) {
+            valid_entries[i] = true;
+            program_table_entries++;
         }
-        program_table_entries++;
     }
 
     debug_print_int("program table entries", program_table_entries);
     IPL_assert(program_table_entries != 0, "Empty Program Table");
 
     if (menu_is_enabled_enum()) {
-        loadparm = menu_get_enum_boot_index(program_table_entries);
+        loadparm = menu_get_enum_boot_index(valid_entries);
     }
 
     debug_print_int("loadparm", loadparm);

pc-bios/s390-ccw/menu.c

@@ -228,19 +228,30 @@ int menu_get_zipl_boot_index(const char *menu_data)
     return get_boot_index(valid_entries);
 }
 
-
-int menu_get_enum_boot_index(int entries)
+int menu_get_enum_boot_index(bool *valid_entries)
 {
-    char tmp[4];
+    char tmp[3];
+    int i;
 
-    sclp_print("s390x Enumerated Boot Menu.\n\n");
+    sclp_print("s390-ccw Enumerated Boot Menu.\n\n");
 
-    sclp_print(uitoa(entries, tmp, sizeof(tmp)));
-    sclp_print(" entries detected. Select from boot index 0 to ");
-    sclp_print(uitoa(entries - 1, tmp, sizeof(tmp)));
-    sclp_print(".\n\n");
+    for (i = 0; i < MAX_BOOT_ENTRIES; i++) {
+        if (valid_entries[i]) {
+            if (i < 10) {
+                sclp_print(" ");
+            }
+            sclp_print("[");
+            sclp_print(uitoa(i, tmp, sizeof(tmp)));
+            sclp_print("]");
+            if (i == 0) {
+                sclp_print(" default\n");
+            }
+            sclp_print("\n");
+        }
+    }
 
-    return get_boot_index(entries);
+    sclp_print("\n");
+    return get_boot_index(valid_entries);
 }
 
 void menu_set_parms(uint8_t boot_menu_flag, uint32_t boot_menu_timeout)

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

@@ -91,7 +91,7 @@ void zipl_load(void);
 void menu_set_parms(uint8_t boot_menu_flag, uint32_t boot_menu_timeout);
 int menu_get_zipl_boot_index(const char *menu_data);
 bool menu_is_enabled_zipl(void);
-int menu_get_enum_boot_index(int entries);
+int menu_get_enum_boot_index(bool *valid_entries);
 bool menu_is_enabled_enum(void);
 
 #define MAX_BOOT_ENTRIES  31