[S390] cleanup lowcore access from external interrupts

Read external interrupts parameters from the lowcore in the first
level interrupt handler in entry[64].S.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 8 insertions, 15 deletions

diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 2b3bc3ec0541..266b34b55403 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -228,25 +228,22 @@ dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 }
 
 /* Handle external interruption. */
-static void
-dasd_ext_handler(__u16 code)
+static void dasd_ext_handler(unsigned int ext_int_code,
+                             unsigned int param32, unsigned long param64)
 {
         struct dasd_ccw_req *cqr, *next;
         struct dasd_device *device;
         unsigned long long expires;
         unsigned long flags;
-        u8 int_code, status;
         addr_t ip;
         int rc;
 
-        int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
-        status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
-        switch (int_code) {
+        switch (ext_int_code >> 24) {
         case DASD_DIAG_CODE_31BIT:
-                ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
+                ip = (addr_t) param32;
                 break;
         case DASD_DIAG_CODE_64BIT:
-                ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
+                ip = (addr_t) param64;
                 break;
         default:
                 return;
@@ -281,7 +278,7 @@ dasd_ext_handler(__u16 code)
         cqr->stopclk = get_clock();
 
         expires = 0;
-        if (status == 0) {
+        if ((ext_int_code & 0xff0000) == 0) {
                 cqr->status = DASD_CQR_SUCCESS;
                 /* Start first request on queue if possible -> fast_io. */
                 if (!list_empty(&device->ccw_queue)) {
@@ -296,8 +293,8 @@ dasd_ext_handler(__u16 code)
         } else {
                 cqr->status = DASD_CQR_QUEUED;
                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
-                            "request %p was %d (%d retries left)", cqr, status,
-                            cqr->retries);
+                              "request %p was %d (%d retries left)", cqr,
+                              (ext_int_code >> 16) & 0xff, cqr->retries);
                 dasd_diag_erp(device);
         }
 
diff --git a/drivers/s390/block/dasd_diag.h b/drivers/s390/block/dasd_diag.h
index b8c78267ff3e..4f71fbe60c82 100644
--- a/drivers/s390/block/dasd_diag.h
+++ b/drivers/s390/block/dasd_diag.h
@@ -18,10 +18,6 @@
 #define DEV_CLASS_FBA   0x01
 #define DEV_CLASS_ECKD  0x04
 
-#define DASD_DIAG_LC_INT_CODE           132
-#define DASD_DIAG_LC_INT_STATUS         133
-#define DASD_DIAG_LC_INT_PARM_31BIT     128
-#define DASD_DIAG_LC_INT_PARM_64BIT     4536
 #define DASD_DIAG_CODE_31BIT            0x03
 #define DASD_DIAG_CODE_64BIT            0x07