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path: root/drivers/s390/char/sclp_cmd.c
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Diffstat (limited to 'drivers/s390/char/sclp_cmd.c')
-rw-r--r--drivers/s390/char/sclp_cmd.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 766cb7b19b40..71ea923c322d 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -48,6 +48,7 @@ struct read_info_sccb {
u8 _reserved5[4096 - 112]; /* 112-4095 */
} __attribute__((packed, aligned(PAGE_SIZE)));
+static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE);
static struct read_info_sccb __initdata early_read_info_sccb;
static int __initdata early_read_info_sccb_valid;
@@ -104,6 +105,19 @@ static void __init sclp_read_info_early(void)
}
}
+static void __init sclp_event_mask_early(void)
+{
+ struct init_sccb *sccb = &early_event_mask_sccb;
+ int rc;
+
+ do {
+ memset(sccb, 0, sizeof(*sccb));
+ sccb->header.length = sizeof(*sccb);
+ sccb->mask_length = sizeof(sccb_mask_t);
+ rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
+ } while (rc == -EBUSY);
+}
+
void __init sclp_facilities_detect(void)
{
struct read_info_sccb *sccb;
@@ -119,6 +133,30 @@ void __init sclp_facilities_detect(void)
rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
rzm <<= 20;
+
+ sclp_event_mask_early();
+}
+
+bool __init sclp_has_linemode(void)
+{
+ struct init_sccb *sccb = &early_event_mask_sccb;
+
+ if (sccb->header.response_code != 0x20)
+ return 0;
+ if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))
+ return 1;
+ return 0;
+}
+
+bool __init sclp_has_vt220(void)
+{
+ struct init_sccb *sccb = &early_event_mask_sccb;
+
+ if (sccb->header.response_code != 0x20)
+ return 0;
+ if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
+ return 1;
+ return 0;
}
unsigned long long sclp_get_rnmax(void)