Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / s390 / include / asm / facility.h

diff --git a/kernel/arch/s390/include/asm/facility.h b/kernel/arch/s390/include/asm/facility.h
new file mode 100644 (file)
index 0000000..0aa6a7e
--- /dev/null
+++ b/kernel/arch/s390/include/asm/facility.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright IBM Corp. 1999, 2009
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef __ASM_FACILITY_H
+#define __ASM_FACILITY_H
+
+#include <linux/string.h>
+#include <linux/preempt.h>
+#include <asm/lowcore.h>
+
+#define MAX_FACILITY_BIT (256*8)       /* stfle_fac_list has 256 bytes */
+
+static inline int __test_facility(unsigned long nr, void *facilities)
+{
+       unsigned char *ptr;
+
+       if (nr >= MAX_FACILITY_BIT)
+               return 0;
+       ptr = (unsigned char *) facilities + (nr >> 3);
+       return (*ptr & (0x80 >> (nr & 7))) != 0;
+}
+
+/*
+ * The test_facility function uses the bit odering where the MSB is bit 0.
+ * That makes it easier to query facility bits with the bit number as
+ * documented in the Principles of Operation.
+ */
+static inline int test_facility(unsigned long nr)
+{
+       return __test_facility(nr, &S390_lowcore.stfle_fac_list);
+}
+
+/**
+ * stfle - Store facility list extended
+ * @stfle_fac_list: array where facility list can be stored
+ * @size: size of passed in array in double words
+ */
+static inline void stfle(u64 *stfle_fac_list, int size)
+{
+       unsigned long nr;
+
+       preempt_disable();
+       asm volatile(
+               "       .insn s,0xb2b10000,0(0)\n" /* stfl */
+               "0:\n"
+               EX_TABLE(0b, 0b)
+               : "+m" (S390_lowcore.stfl_fac_list));
+       nr = 4; /* bytes stored by stfl */
+       memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
+       if (S390_lowcore.stfl_fac_list & 0x01000000) {
+               /* More facility bits available with stfle */
+               register unsigned long reg0 asm("0") = size - 1;
+
+               asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
+                            : "+d" (reg0)
+                            : "a" (stfle_fac_list)
+                            : "memory", "cc");
+               nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
+       }
+       memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
+       preempt_enable();
+}
+
+#endif /* __ASM_FACILITY_H */