s390/crypto: add inline assembly for KMA instruction to cpacf.h

Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
index e06f2556b31641909e6f6915b770a8644aa3cbad..cbf11aa3e6e94e78af4cb7554ca262108c8a6c35 100644 (file)
--- a/arch/s390/include/asm/cpacf.h
+++ b/arch/s390/include/asm/cpacf.h
@@ -1,7 +1,7 @@
 /*
  * CP Assist for Cryptographic Functions (CPACF)
  *
- * Copyright IBM Corp. 2003, 2016
+ * Copyright IBM Corp. 2003, 2017
  * Author(s): Thomas Spatzier
  *           Jan Glauber
  *           Harald Freudenberger (freude@de.ibm.com)
@@ -133,6 +133,22 @@
 #define CPACF_PRNO_TRNG_Q_R2C_RATIO    0x70
 #define CPACF_PRNO_TRNG                        0x72
 
+/*
+ * Function codes for the KMA (CIPHER MESSAGE WITH AUTHENTICATION)
+ * instruction
+ */
+#define CPACF_KMA_QUERY                0x00
+#define CPACF_KMA_GCM_AES_128  0x12
+#define CPACF_KMA_GCM_AES_192  0x13
+#define CPACF_KMA_GCM_AES_256  0x14
+
+/*
+ * Flags for the KMA (CIPHER MESSAGE WITH AUTHENTICATION) instruction
+ */
+#define CPACF_KMA_LPC  0x100   /* Last-Plaintext/Ciphertext */
+#define CPACF_KMA_LAAD 0x200   /* Last-AAD */
+#define CPACF_KMA_HS   0x400   /* Hash-subkey Supplied */
+
 typedef struct { unsigned char bytes[16]; } cpacf_mask_t;
 
 /**
@@ -178,6 +194,8 @@ static inline int __cpacf_check_opcode(unsigned int opcode)
                return test_facility(77);       /* check for MSA4 */
        case CPACF_PRNO:
                return test_facility(57);       /* check for MSA5 */
+       case CPACF_KMA:
+               return test_facility(146);      /* check for MSA8 */
        default:
                BUG();
        }
@@ -469,4 +487,36 @@ static inline void cpacf_pckmo(long func, void *param)
                : "cc", "memory");
 }
 
+/**
+ * cpacf_kma() - executes the KMA (CIPHER MESSAGE WITH AUTHENTICATION)
+ *              instruction
+ * @func: the function code passed to KMA; see CPACF_KMA_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @dest: address of destination memory area
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ * @aad: address of additional authenticated data memory area
+ * @aad_len: length of aad operand in bytes
+ */
+static inline void cpacf_kma(unsigned long func, void *param, u8 *dest,
+                            const u8 *src, unsigned long src_len,
+                            const u8 *aad, unsigned long aad_len)
+{
+       register unsigned long r0 asm("0") = (unsigned long) func;
+       register unsigned long r1 asm("1") = (unsigned long) param;
+       register unsigned long r2 asm("2") = (unsigned long) src;
+       register unsigned long r3 asm("3") = (unsigned long) src_len;
+       register unsigned long r4 asm("4") = (unsigned long) aad;
+       register unsigned long r5 asm("5") = (unsigned long) aad_len;
+       register unsigned long r6 asm("6") = (unsigned long) dest;
+
+       asm volatile(
+               "0:     .insn   rrf,%[opc] << 16,%[dst],%[src],%[aad],0\n"
+               "       brc     1,0b\n" /* handle partial completion */
+               : [dst] "+a" (r6), [src] "+a" (r2), [slen] "+d" (r3),
+                 [aad] "+a" (r4), [alen] "+d" (r5)
+               : [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KMA)
+               : "cc", "memory");
+}
+
 #endif /* _ASM_S390_CPACF_H */