s390/ap: new low level inline functions ap_bapq() and ap_aapq()
Introduce two new low level functions ap_bapq() (calls
PQAP(BAPQ)) and ap_aapq (calls PQAP(AAPQ)). Both functions
are only meant to be used in SE environment with the SE
AP binding facility available.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
index 3442e76..92b04d6 100644
--- a/arch/s390/include/asm/ap.h
+++ b/arch/s390/include/asm/ap.h
@@ -354,6 +354,59 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit,
return reg1.status;
}
+/*
+ * ap_bapq(): SE bind AP queue.
+ * @qid: The AP queue number
+ *
+ * Returns AP queue status structure.
+ *
+ * Invoking this function in a non-SE environment
+ * may case a specification exception.
+ */
+static inline struct ap_queue_status ap_bapq(ap_qid_t qid)
+{
+ unsigned long reg0 = qid | (7UL << 24); /* fc 7 is BAPQ */
+ union ap_queue_status_reg reg1;
+
+ asm volatile(
+ " lgr 0,%[reg0]\n" /* qid arg into gr0 */
+ " .insn rre,0xb2af0000,0,0\n" /* PQAP(BAPQ) */
+ " lgr %[reg1],1\n" /* gr1 (status) into reg1 */
+ : [reg1] "=&d" (reg1.value)
+ : [reg0] "d" (reg0)
+ : "cc", "0", "1");
+
+ return reg1.status;
+}
+
+/*
+ * ap_aapq(): SE associate AP queue.
+ * @qid: The AP queue number
+ * @sec_idx: The secret index
+ *
+ * Returns AP queue status structure.
+ *
+ * Invoking this function in a non-SE environment
+ * may case a specification exception.
+ */
+static inline struct ap_queue_status ap_aapq(ap_qid_t qid, unsigned int sec_idx)
+{
+ unsigned long reg0 = qid | (8UL << 24); /* fc 8 is AAPQ */
+ unsigned long reg2 = sec_idx;
+ union ap_queue_status_reg reg1;
+
+ asm volatile(
+ " lgr 0,%[reg0]\n" /* qid arg into gr0 */
+ " lgr 2,%[reg2]\n" /* secret index into gr2 */
+ " .insn rre,0xb2af0000,0,0\n" /* PQAP(AAPQ) */
+ " lgr %[reg1],1\n" /* gr1 (status) into reg1 */
+ : [reg1] "=&d" (reg1.value)
+ : [reg0] "d" (reg0), [reg2] "d" (reg2)
+ : "cc", "0", "1", "2");
+
+ return reg1.status;
+}
+
/**
* ap_nqap(): Send message to adjunct processor queue.
* @qid: The AP queue number
