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crypto: s390 - add System z hardware support for CTR mode

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This patch adds System z hardware acceleration support for AES, DES
and 3DES in CTR mode. The hardware support is available starting with
System z196.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gerald Schaefer
2011-05-04 15:09:44 +10:00
committed by Herbert Xu
parent 9996e3421c
commit 0200f3ecc1
4 changed files with 383 additions and 6 deletions
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66
arch/s390/crypto/crypt_s390.h
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@@ -34,7 +34,8 @@ enum crypt_s390_operations {
CRYPT_S390_KMC = 0x0200,
CRYPT_S390_KIMD = 0x0300,
CRYPT_S390_KLMD = 0x0400,
CRYPT_S390_KMAC = 0x0500
CRYPT_S390_KMAC = 0x0500,
CRYPT_S390_KMCTR = 0x0600
};
/*
@@ -82,6 +83,26 @@ enum crypt_s390_kmc_func {
KMC_PRNG = CRYPT_S390_KMC | 0x43,
};
/*
* function codes for KMCTR (CIPHER MESSAGE WITH COUNTER)
* instruction
*/
enum crypt_s390_kmctr_func {
KMCTR_QUERY = CRYPT_S390_KMCTR | 0x0,
KMCTR_DEA_ENCRYPT = CRYPT_S390_KMCTR | 0x1,
KMCTR_DEA_DECRYPT = CRYPT_S390_KMCTR | 0x1 | 0x80,
KMCTR_TDEA_128_ENCRYPT = CRYPT_S390_KMCTR | 0x2,
KMCTR_TDEA_128_DECRYPT = CRYPT_S390_KMCTR | 0x2 | 0x80,
KMCTR_TDEA_192_ENCRYPT = CRYPT_S390_KMCTR | 0x3,
KMCTR_TDEA_192_DECRYPT = CRYPT_S390_KMCTR | 0x3 | 0x80,
KMCTR_AES_128_ENCRYPT = CRYPT_S390_KMCTR | 0x12,
KMCTR_AES_128_DECRYPT = CRYPT_S390_KMCTR | 0x12 | 0x80,
KMCTR_AES_192_ENCRYPT = CRYPT_S390_KMCTR | 0x13,
KMCTR_AES_192_DECRYPT = CRYPT_S390_KMCTR | 0x13 | 0x80,
KMCTR_AES_256_ENCRYPT = CRYPT_S390_KMCTR | 0x14,
KMCTR_AES_256_DECRYPT = CRYPT_S390_KMCTR | 0x14 | 0x80,
};
/*
* function codes for KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST)
* instruction
@@ -292,6 +313,45 @@ static inline int crypt_s390_kmac(long func, void *param,
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/**
* crypt_s390_kmctr:
* @func: the function code passed to KMCTR; see crypt_s390_kmctr_func
* @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
* @counter: address of counter value
*
* Executes the KMCTR (CIPHER MESSAGE WITH COUNTER) operation of the CPU.
*
* Returns -1 for failure, 0 for the query func, number of processed
* bytes for encryption/decryption funcs
*/
static inline int crypt_s390_kmctr(long func, void *param, u8 *dest,
const u8 *src, long src_len, u8 *counter)
{
register long __func asm("0") = func & CRYPT_S390_FUNC_MASK;
register void *__param asm("1") = param;
register const u8 *__src asm("2") = src;
register long __src_len asm("3") = src_len;
register u8 *__dest asm("4") = dest;
register u8 *__ctr asm("6") = counter;
int ret = -1;
asm volatile(
"0: .insn rrf,0xb92d0000,%3,%1,%4,0 \n" /* KMCTR opcode */
"1: brc 1,0b \n" /* handle partial completion */
" la %0,0\n"
"2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b)
: "+d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest),
"+a" (__ctr)
: "d" (__func), "a" (__param) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/**
* crypt_s390_func_available:
* @func: the function code of the specific function; 0 if op in general
@@ -329,6 +389,10 @@ static inline int crypt_s390_func_available(int func,
case CRYPT_S390_KMAC:
ret = crypt_s390_kmac(KMAC_QUERY, &status, NULL, 0);
break;
case CRYPT_S390_KMCTR:
ret = crypt_s390_kmctr(KMCTR_QUERY, &status, NULL, NULL, 0,
NULL);
break;
default:
return 0;
}