s390-ccw: read user input for boot index via the SCLP console

Implements an sclp_read function to capture input from the
console and a wrapper function that handles parsing certain
characters and adding input to a buffer. The input is checked
for any erroneous values and is handled appropriately.

A prompt will persist until input is entered or the timeout
expires (if one was set). Example:

      Please choose (default will boot in 10 seconds):

Correct input will boot the respective boot index. If the
user's input is empty, 0, or if the timeout expires, then
the default zipl entry will be chosen. If the input is
within the range of available boot entries, then the
selection will be booted. Any erroneous input will cancel
the timeout and re-prompt the user.

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, 19 insertions, 0 deletions

diff --git a/pc-bios/s390-ccw/sclp.c b/pc-bios/s390-ccw/sclp.c
index e6a0898..a2f25eb 100644
--- a/pc-bios/s390-ccw/sclp.c
+++ b/pc-bios/s390-ccw/sclp.c
@@ -119,3 +119,22 @@ void sclp_get_loadparm_ascii(char *loadparm)
         ebcdic_to_ascii((char *) sccb->loadparm, loadparm, 8);
     }
 }
+
+int sclp_read(char *str, size_t count)
+{
+    ReadEventData *sccb = (void *)_sccb;
+    char *buf = (char *)(&sccb->ebh) + 7;
+
+    /* If count exceeds max buffer size, then restrict it to the max size */
+    if (count > SCCB_SIZE - 8) {
+        count = SCCB_SIZE - 8;
+    }
+
+    sccb->h.length = SCCB_SIZE;
+    sccb->h.function_code = SCLP_UNCONDITIONAL_READ;
+
+    sclp_service_call(SCLP_CMD_READ_EVENT_DATA, sccb);
+    memcpy(str, buf, count);
+
+    return sccb->ebh.length - 7;
+}