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Commit f75fa65d authored by Harald Freudenberger's avatar Harald Freudenberger Committed by Martin Schwidefsky
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s390/crypto: Add new subfunctions to the cpacf PRNO function. 



There is a new TRNG extension in the subcodes for the cpacf
PRNO function. This patch introduces new defines and a new
cpacf_trng inline function to provide these new features for
other kernel code parts.

Signed-off-by: default avatarHarald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 985a9d20

arch/s390/include/asm/cpacf.h

+29 −2
Original line number Diff line number Diff line
@@ -129,6 +129,8 @@ 
#define CPACF_PRNO_QUERY		0x00

#define CPACF_PRNO_SHA512_DRNG_GEN	0x03

#define CPACF_PRNO_SHA512_DRNG_SEED	0x83

#define CPACF_PRNO_TRNG_Q_R2C_RATIO	0x70

#define CPACF_PRNO_TRNG			0x72



typedef struct { unsigned char bytes[16]; } cpacf_mask_t;
@@ -383,8 +385,8 @@ static inline int cpacf_kmctr(unsigned long func, void *param, u8 *dest, 
 * @seed_len: size of seed data in bytes

 */

static inline void cpacf_prno(unsigned long func, void *param,

			      u8 *dest, long dest_len,

			      const u8 *seed, long seed_len)

			      u8 *dest, unsigned long dest_len,

			      const u8 *seed, unsigned long seed_len)

{

	register unsigned long r0 asm("0") = (unsigned long) func;

	register unsigned long r1 asm("1") = (unsigned long) param;
@@ -402,6 +404,31 @@ static inline void cpacf_prno(unsigned long func, void *param, 
		: "cc", "memory");

}



/**

 * cpacf_trng() - executes the TRNG subfunction of the PRNO instruction

 * @ucbuf: buffer for unconditioned data

 * @ucbuf_len: amount of unconditioned data to fetch in bytes

 * @cbuf: buffer for conditioned data

 * @cbuf_len: amount of conditioned data to fetch in bytes

 */

static inline void cpacf_trng(u8 *ucbuf, unsigned long ucbuf_len,

			      u8 *cbuf, unsigned long cbuf_len)

{

	register unsigned long r0 asm("0") = (unsigned long) CPACF_PRNO_TRNG;

	register unsigned long r2 asm("2") = (unsigned long) ucbuf;

	register unsigned long r3 asm("3") = (unsigned long) ucbuf_len;

	register unsigned long r4 asm("4") = (unsigned long) cbuf;

	register unsigned long r5 asm("5") = (unsigned long) cbuf_len;



	asm volatile (

		"0:	.insn	rre,%[opc] << 16,%[ucbuf],%[cbuf]\n"

		"	brc	1,0b\n"	  /* handle partial completion */

		: [ucbuf] "+a" (r2), [ucbuflen] "+d" (r3),

		  [cbuf] "+a" (r4), [cbuflen] "+d" (r5)

		: [fc] "d" (r0), [opc] "i" (CPACF_PRNO)

		: "cc", "memory");

}



/**

 * cpacf_pcc() - executes the PCC (PERFORM CRYPTOGRAPHIC COMPUTATION)

 *		 instruction