1 files changed, 47 insertions, 0 deletions

diff --git a/arch/s390/kvm/sie64a.S b/arch/s390/kvm/sie64a.S
new file mode 100644
index 000000000000..934fd6a885f6
--- /dev/null
+++ b/arch/s390/kvm/sie64a.S
@@ -0,0 +1,47 @@
+/*
+ * sie64a.S - low level sie call
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#include <linux/errno.h>
+#include <asm/asm-offsets.h>
+
+SP_R5 = 5 * 8   # offset into stackframe
+SP_R6 = 6 * 8
+
+/*
+ * sie64a calling convention:
+ * %r2 pointer to sie control block
+ * %r3 guest register save area
+ */
+        .globl  sie64a
+sie64a:
+        lgr     %r5,%r3
+        stmg    %r5,%r14,SP_R5(%r15)    # save register on entry
+        lgr     %r14,%r2                # pointer to sie control block
+        lmg     %r0,%r13,0(%r3)         # load guest gprs 0-13
+sie_inst:
+        sie     0(%r14)
+        lg      %r14,SP_R5(%r15)
+        stmg    %r0,%r13,0(%r14)        # save guest gprs 0-13
+        lghi    %r2,0
+        lmg     %r6,%r14,SP_R6(%r15)
+        br      %r14
+
+sie_err:
+        lg      %r14,SP_R5(%r15)
+        stmg    %r0,%r13,0(%r14)        # save guest gprs 0-13
+        lghi    %r2,-EFAULT
+        lmg     %r6,%r14,SP_R6(%r15)
+        br      %r14
+
+        .section __ex_table,"a"
+        .quad   sie_inst,sie_err
+        .previous