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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2011-04-26 16:12:42 +1000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2011-05-04 15:06:30 +1000 |
| commit | 99d97222150a24e6096805530e141af94183b9a1 (patch) | |
| tree | efe6ac0e8fee6230b0dce3846ab0c0e93e1c5c8e /arch/s390/crypto/crypt_s390.h | |
| parent | 98971f8439b1bb9a61682fe24a865ddd25167a6b (diff) | |
| download | op-kernel-dev-99d97222150a24e6096805530e141af94183b9a1.zip op-kernel-dev-99d97222150a24e6096805530e141af94183b9a1.tar.gz | |
crypto: s390 - add System z hardware support for XTS mode
This patch adds System z hardware acceleration support for the AES XTS mode.
The hardware support is available beginning with System z196.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/s390/crypto/crypt_s390.h')
| -rw-r--r-- | arch/s390/crypto/crypt_s390.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/s390/crypto/crypt_s390.h b/arch/s390/crypto/crypt_s390.h index 4b8c96c..7cbfaf0 100644 --- a/arch/s390/crypto/crypt_s390.h +++ b/arch/s390/crypto/crypt_s390.h @@ -55,6 +55,10 @@ enum crypt_s390_km_func { KM_AES_192_DECRYPT = CRYPT_S390_KM | 0x13 | 0x80, KM_AES_256_ENCRYPT = CRYPT_S390_KM | 0x14, KM_AES_256_DECRYPT = CRYPT_S390_KM | 0x14 | 0x80, + KM_XTS_128_ENCRYPT = CRYPT_S390_KM | 0x32, + KM_XTS_128_DECRYPT = CRYPT_S390_KM | 0x32 | 0x80, + KM_XTS_256_ENCRYPT = CRYPT_S390_KM | 0x34, + KM_XTS_256_DECRYPT = CRYPT_S390_KM | 0x34 | 0x80, }; /* @@ -334,4 +338,31 @@ static inline int crypt_s390_func_available(int func, return (status[func >> 3] & (0x80 >> (func & 7))) != 0; } +/** + * crypt_s390_pcc: + * @func: the function code passed to KM; see crypt_s390_km_func + * @param: address of parameter block; see POP for details on each func + * + * Executes the PCC (PERFORM CRYPTOGRAPHIC COMPUTATION) operation of the CPU. + * + * Returns -1 for failure, 0 for success. + */ +static inline int crypt_s390_pcc(long func, void *param) +{ + register long __func asm("0") = func & 0x7f; /* encrypt or decrypt */ + register void *__param asm("1") = param; + int ret = -1; + + asm volatile( + "0: .insn rre,0xb92c0000,0,0 \n" /* PCC 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) + : "d" (__func), "a" (__param) : "cc", "memory"); + return ret; +} + + #endif /* _CRYPTO_ARCH_S390_CRYPT_S390_H */ |
