s390-ccw: parse and set boot menu options

Set boot menu options for an s390 guest and store them in
the iplb. These options are set via the QEMU command line
option:

    -boot menu=on|off[,splash-time=X]

or via the libvirt domain xml:

    <os>
      <bootmenu enable='yes|no' timeout='X'/>
    </os>

Where X represents some positive integer representing
milliseconds.

Any value set for loadparm will override all boot menu options.
If loadparm=PROMPT, then the menu will be enabled without a
timeout.

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

1 files changed, 7 insertions, 2 deletions

diff --git a/pc-bios/s390-ccw/iplb.h b/pc-bios/s390-ccw/iplb.h
index 31d2934..832bb94 100644
--- a/pc-bios/s390-ccw/iplb.h
+++ b/pc-bios/s390-ccw/iplb.h
@@ -74,14 +74,19 @@ extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
 
 #define QIPL_ADDRESS  0xcc
 
+/* Boot Menu flags */
+#define QIPL_FLAG_BM_OPTS_CMD   0x80
+
 /*
  * This definition must be kept in sync with the defininition
  * in hw/s390x/ipl.h
  */
 struct QemuIplParameters {
-    uint8_t  reserved1[4];
+    uint8_t  qipl_flags;
+    uint8_t  reserved1[3];
     uint64_t netboot_start_addr;
-    uint8_t  reserved2[16];
+    uint32_t boot_menu_timeout;
+    uint8_t  reserved2[12];
 } __attribute__ ((packed));
 typedef struct QemuIplParameters QemuIplParameters;