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s390/crypto: Add new subfunctions to the cpacf PRNO function.

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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: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Harald Freudenberger 2017-02-28 08:59:22 +01:00 committed by Martin Schwidefsky
parent 985a9d20da
commit f75fa65d70
1 changed files with 29 additions and 2 deletions
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31
arch/s390/include/asm/cpacf.h
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@ -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