/*
* Cryptographic API.
*
* Support for s390 cryptographic instructions.
*
* Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
* Author(s): Thomas Spatzier (tspat@de.ibm.com)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#ifndef _CRYPTO_ARCH_S390_CRYPT_S390_H
#define _CRYPTO_ARCH_S390_CRYPT_S390_H
#include <asm/errno.h>
#define CRYPT_S390_OP_MASK 0xFF00
#define CRYPT_S390_FUNC_MASK 0x00FF
/* s930 cryptographic operations */
enum crypt_s390_operations {
CRYPT_S390_KM = 0x0100,
CRYPT_S390_KMC = 0x0200,
CRYPT_S390_KIMD = 0x0300,
CRYPT_S390_KLMD = 0x0400,
CRYPT_S390_KMAC = 0x0500
};
/* function codes for KM (CIPHER MESSAGE) instruction
* 0x80 is the decipher modifier bit
*/
enum crypt_s390_km_func {
KM_QUERY = CRYPT_S390_KM | 0,
KM_DEA_ENCRYPT = CRYPT_S390_KM | 1,
KM_DEA_DECRYPT = CRYPT_S390_KM | 1 | 0x80,
KM_TDEA_128_ENCRYPT = CRYPT_S390_KM | 2,
KM_TDEA_128_DECRYPT = CRYPT_S390_KM | 2 | 0x80,
KM_TDEA_192_ENCRYPT = CRYPT_S390_KM | 3,
KM_TDEA_192_DECRYPT = CRYPT_S390_KM | 3 | 0x80,
};
/* function codes for KMC (CIPHER MESSAGE WITH CHAINING)
* instruction
*/
enum crypt_s390_kmc_func {
KMC_QUERY = CRYPT_S390_KMC | 0,
KMC_DEA_ENCRYPT = CRYPT_S390_KMC | 1,
KMC_DEA_DECRYPT = CRYPT_S390_KMC | 1 | 0x80,
KMC_TDEA_128_ENCRYPT = CRYPT_S390_KMC | 2,
KMC_TDEA_128_DECRYPT = CRYPT_S390_KMC | 2 | 0x80,
KMC_TDEA_192_ENCRYPT = CRYPT_S390_KMC | 3,
KMC_TDEA_192_DECRYPT = CRYPT_S390_KMC | 3 | 0x80,
};
/* function codes for KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST)
* instruction
*/
enum crypt_s390_kimd_func {
KIMD_QUERY = CRYPT_S390_KIMD | 0,
KIMD_SHA_1 = CRYPT_S390_KIMD | 1,
KIMD_SHA_256 = CRYPT_S390_KIMD | 2,
};
/* function codes for KLMD (COMPUTE LAST MESSAGE DIGEST)
* instruction
*/
enum crypt_s390_klmd_func {
KLMD_QUERY = CRYPT_S390_KLMD | 0,
KLMD_SHA_1 = CRYPT_S390_KLMD | 1,
KLMD_SHA_256 = CRYPT_S390_KLMD | 2,
};
/* function codes for KMAC (COMPUTE MESSAGE AUTHENTICATION CODE)
* instruction
*/
enum crypt_s390_kmac_func {
KMAC_QUERY = CRYPT_S390_KMAC | 0,
KMAC_DEA = CRYPT_S390_KMAC | 1,
KMAC_TDEA_128 = CRYPT_S390_KMAC | 2,
KMAC_TDEA_192 = CRYPT_S390_KMAC | 3
};
/* status word for s390 crypto instructions' QUERY functions */
struct crypt_s390_query_status {
u64 high;
u64 low;
};
/*
* Standard fixup and ex_table sections for crypt_s390 inline functions.
* label 0: the s390 crypto operation
* label 1: just after 1 to catch illegal operation exception
* (unsupported model)
* label 6: the return point after fixup
* label 7: set error value if exception _in_ crypto operation
* label 8: set error value if illegal operation exception
* [ret] is the variable to receive the error code
* [ERR] is the error code value
*/
#ifndef __s390x__
#define __crypt_s390_fixup \
".section .fixup,\"ax\" \n" \
"7: lhi %0,%h[e1] \n" \
" bras 1,9f \n" \
" .long 6b \n" \
"8: lhi %0,%h[e2] \n" \
" bras 1,9f \n" \
" .long 6b \n" \
"9: l 1,0(1) \n" \
" br 1 \n" \
".previous \n" \
".section __ex_table,\"a\" \n" \
" .align 4 \n" \
" .long 0b,7b \n" \
" .long 1b,8b \n" \
".previous"
#else /* __s390x__ */
#define __crypt_s390_fixup \
".section .fixup,\"ax\" \n" \
"7: lhi %0,%h[e1] \n" \
" jg 6b \n" \
"8: lhi %0,%h[e2] \n" \
" jg 6b \n" \
".previous\n" \
".section __ex_table,\"a\" \n" \
" .align 8 \n" \
" .quad 0b,7b \n" \
" .quad 1b,8b \n" \
".previous"
#endif /* __s390x__ */
/*
* Standard code for setting the result of s390 crypto instructions.
* %0: the register which will receive the result
* [result]: the register containing the result (e.g. second operand length
* to compute number of processed bytes].
*/
#ifndef __s390x__
#define __crypt_s390_set_result \
" lr %0,%[result] \n"
#else /* __s390x__ */
#define __crypt_s390_set_result \
" lgr %0,%[result] \n"
#endif
/*
* Executes the KM (CIPHER MESSAGE) operation of the CPU.
* @param func: the function code passed to KM; see crypt_s390_km_func
* @param param: address of parameter block; see POP for details on each func
* @param dest: address of destination memory area
* @param src: address of source memory area
* @param src_len: length of src operand in bytes
* @returns < zero for failure, 0 for the query func, number of processed bytes
* for encryption/decryption funcs
*/
static inline int
crypt_s390_km(long func, void* param, u8* dest, const u8* src, long src_len)
{
register long __func asm("0") = func & CRYPT_S390_FUNC_MASK;
register void* __param asm("1") = param;
register u8* __dest asm("4") = dest;
register const u8* __src asm("2") = src;
register long __src_len asm("3") = src_len;
int ret;
ret = 0;
__asm__ __volatile__ (
"0: .insn rre,0xB92E0000,%1,%2 \n" /* KM opcode */
"1: brc 1,0b \n" /* handle partial completion */
__crypt_s390_set_result
"6: \n"
__crypt_s390_fixup
: "+d" (ret), "+a" (__dest), "+a" (__src),
[result] "+d" (__src_len)
: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
"a" (__param)
: "cc", "memory"
);
if (ret >= 0 && func & CRYPT_S390_FUNC_MASK){
ret = src_len - ret;
}
return ret;
}
/*
* Executes the KMC (CIPHER MESSAGE WITH CHAINING) operation of the CPU.
* @param func: the function code passed to KM; see crypt_s390_kmc_func
* @param param: address of parameter block; see POP for details on each func
* @param dest: address of destination memory area
* @param src: address of source memory area
* @param src_len: length of src operand in bytes
* @returns < zero for failure, 0 for the query func, number of processed bytes
* for encryption/decryption funcs
*/
static inline int
crypt_s390_kmc(long func, void* param, u8* dest, const u8* src, long src_len)
{
register long __func asm("0") = func & CRYPT_S390_FUNC_MASK;
register void* __param asm("1") = param;
register u8* __dest asm("4") = dest;
register const u8* __src asm("2") = src;
register long __src_len asm("3") = src_len;
int ret;
ret = 0;
__asm__ __volatile__ (
"0: .insn rre,0xB92F0000,%1,%2 \n" /* KMC opcode */
"1: brc 1,0b \n" /* handle partial completion */
__crypt_s390_set_result
"6: \n"
__crypt_s390_fixup
: "+d" (ret), "+a" (__dest), "+a" (__src),
[result] "+d" (__src_len)
: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
"a" (__param)
: "cc", "memory"
);
if (ret >= 0 && func & CRYPT_S390_FUNC_MASK){
ret = src_len - ret;
}
return ret;
}
/*
* Executes the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) operation
* of the CPU.
* @param func: the function code passed to KM; see crypt_s390_kimd_func
* @param param: address of parameter block; see POP for details on each func
* @param src: address of source memory area
* @param src_len: length of src operand in bytes
* @returns < zero for failure, 0 for the query func, number of processed bytes
* for digest funcs
*/
static inline int
crypt_s390_kimd(long func, void* param, const u8* src, long src_len)
{
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;
int ret;
ret = 0;
__asm__ __volatile__ (
"0: .insn rre,0xB93E0000,%1,%1 \n" /* KIMD opcode */
"1: brc 1,0b \n" /* handle partical completion */
__crypt_s390_set_result
"6: \n"
__crypt_s390_fixup
: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
"a" (__param)
: "cc", "memory"
);
if (ret >= 0 && (func & CRYPT_S390_FUNC_MASK)){
ret = src_len - ret;
}
return ret;
}
/*
* Executes the KLMD (COMPUTE LAST MESSAGE DIGEST) operation of the CPU.
* @param func: the function code passed to KM; see crypt_s390_klmd_func
* @param param: address of parameter block; see POP for details on each func
* @param src: address of source memory area
* @param src_len: length of src operand in bytes
* @returns < zero for failure, 0 for the query func, number of processed bytes
* for digest funcs
*/
static inline int
crypt_s390_klmd(long func, void* param, const u8* src, long src_len)
{
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;
int ret;
ret = 0;
__asm__ __volatile__ (
"0: .insn rre,0xB93F0000,%1,%1 \n" /* KLMD opcode */
"1: brc 1,0b \n" /* handle partical completion */
__crypt_s390_set_result
"6: \n"
__crypt_s390_fixup
: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
"a" (__param)
: "cc", "memory"
);
if (ret >= 0 && func & CRYPT_S390_FUNC_MASK){
ret = src_len - ret;
}
return ret;
}
/*
* Executes the KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) operation
* of the CPU.
* @param func: the function code passed to KM; see crypt_s390_klmd_func
* @param param: address of parameter block; see POP for details on each func
* @param src: address of source memory area
* @param src_len: length of src operand in bytes
* @returns < zero for failure, 0 for the query func, number of processed bytes
* for digest funcs
*/
static inline int
crypt_s390_kmac(long func, void* param, const u8* src, long src_len)
{
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;
int ret;
ret = 0;
__asm__ __volatile__ (
"0: .insn rre,0xB91E0000,%5,%5 \n" /* KMAC opcode */
"1: brc 1,0b \n" /* handle partical completion */
__crypt_s390_set_result
"6: \n"
__crypt_s390_fixup
: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
"a" (__param)
: "cc", "memory"
);
if (ret >= 0 && func & CRYPT_S390_FUNC_MASK){
ret = src_len - ret;
}
return ret;
}
/**
* Tests if a specific crypto function is implemented on the machine.
* @param func: the function code of the specific function; 0 if op in general
* @return 1 if func available; 0 if func or op in general not available
*/
static inline int
crypt_s390_func_available(int func)
{
int ret;
struct crypt_s390_query_status status = {
.high = 0,
.low = 0
};
switch (func & CRYPT_S390_OP_MASK){
case CRYPT_S390_KM:
ret = crypt_s390_km(KM_QUERY, &status, NULL, NULL, 0);
break;
case CRYPT_S390_KMC:
ret = crypt_s390_kmc(KMC_QUERY, &status, NULL, NULL, 0);
break;
case CRYPT_S390_KIMD:
ret = crypt_s390_kimd(KIMD_QUERY, &status, NULL, 0);
break;
case CRYPT_S390_KLMD:
ret = crypt_s390_klmd(KLMD_QUERY, &status, NULL, 0);
break;
case CRYPT_S390_KMAC:
ret = crypt_s390_kmac(KMAC_QUERY, &status, NULL, 0);
break;
default:
ret = 0;
return ret;
}
if (ret >= 0){
func &= CRYPT_S390_FUNC_MASK;
func &= 0x7f; //mask modifier bit
if (func < 64){
ret = (status.high >> (64 - func - 1)) & 0x1;
} else {
ret = (status.low >> (128 - func - 1)) & 0x1;
}
} else {
ret = 0;
}
return ret;
}
#endif // _CRYPTO_ARCH_S390_CRYPT_S390_H
