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android_kernel_motorola_sm6225/arch/s390/crypto/crypt_s390.h
Martin Schwidefsky 94c12cc7d1 [S390] Inline assembly cleanup. 
Major cleanup of all s390 inline assemblies. They now have a common
coding style. Quite a few have been shortened, mainly by using register
asm variables. Use of the EX_TABLE macro helps  as well. The atomic ops,
bit ops and locking inlines new use the Q-constraint if a newer gcc
is used.  That results in slightly better code.

Thanks to Christian Borntraeger for proof reading the changes.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2006-09-28 16:56:43 +02:00

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/*
* 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
#define CRYPT_S390_PRIORITY 300
#define CRYPT_S390_COMPOSITE_PRIORITY 400
/* 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 | 0x0,
KM_DEA_ENCRYPT = CRYPT_S390_KM | 0x1,
KM_DEA_DECRYPT = CRYPT_S390_KM | 0x1 | 0x80,
KM_TDEA_128_ENCRYPT = CRYPT_S390_KM | 0x2,
KM_TDEA_128_DECRYPT = CRYPT_S390_KM | 0x2 | 0x80,
KM_TDEA_192_ENCRYPT = CRYPT_S390_KM | 0x3,
KM_TDEA_192_DECRYPT = CRYPT_S390_KM | 0x3 | 0x80,
KM_AES_128_ENCRYPT = CRYPT_S390_KM | 0x12,
KM_AES_128_DECRYPT = CRYPT_S390_KM | 0x12 | 0x80,
KM_AES_192_ENCRYPT = CRYPT_S390_KM | 0x13,
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,
};
/* function codes for KMC (CIPHER MESSAGE WITH CHAINING)
* instruction
*/
enum crypt_s390_kmc_func {
KMC_QUERY = CRYPT_S390_KMC | 0x0,
KMC_DEA_ENCRYPT = CRYPT_S390_KMC | 0x1,
KMC_DEA_DECRYPT = CRYPT_S390_KMC | 0x1 | 0x80,
KMC_TDEA_128_ENCRYPT = CRYPT_S390_KMC | 0x2,
KMC_TDEA_128_DECRYPT = CRYPT_S390_KMC | 0x2 | 0x80,
KMC_TDEA_192_ENCRYPT = CRYPT_S390_KMC | 0x3,
KMC_TDEA_192_DECRYPT = CRYPT_S390_KMC | 0x3 | 0x80,
KMC_AES_128_ENCRYPT = CRYPT_S390_KMC | 0x12,
KMC_AES_128_DECRYPT = CRYPT_S390_KMC | 0x12 | 0x80,
KMC_AES_192_ENCRYPT = CRYPT_S390_KMC | 0x13,
KMC_AES_192_DECRYPT = CRYPT_S390_KMC | 0x13 | 0x80,
KMC_AES_256_ENCRYPT = CRYPT_S390_KMC | 0x14,
KMC_AES_256_DECRYPT = CRYPT_S390_KMC | 0x14 | 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;
};
/*
* 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 const u8* __src asm("2") = src;
register long __src_len asm("3") = src_len;
register u8* __dest asm("4") = dest;
int ret;
asm volatile(
"0: .insn rre,0xb92e0000,%3,%1 \n" /* KM opcode */
"1: brc 1,0b \n" /* handle partial completion */
" ahi %0,%h7\n"
"2: ahi %0,%h8\n"
"3:\n"
EX_TABLE(0b,3b) EX_TABLE(1b,2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest)
: "d" (__func), "a" (__param), "0" (-EFAULT),
"K" (ENOSYS), "K" (-ENOSYS + EFAULT) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/*
* 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 const u8* __src asm("2") = src;
register long __src_len asm("3") = src_len;
register u8* __dest asm("4") = dest;
int ret;
asm volatile(
"0: .insn rre,0xb92f0000,%3,%1 \n" /* KMC opcode */
"1: brc 1,0b \n" /* handle partial completion */
" ahi %0,%h7\n"
"2: ahi %0,%h8\n"
"3:\n"
EX_TABLE(0b,3b) EX_TABLE(1b,2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest)
: "d" (__func), "a" (__param), "0" (-EFAULT),
"K" (ENOSYS), "K" (-ENOSYS + EFAULT) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/*
* 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;
asm volatile(
"0: .insn rre,0xb93e0000,%1,%1 \n" /* KIMD opcode */
"1: brc 1,0b \n" /* handle partial completion */
" ahi %0,%h6\n"
"2: ahi %0,%h7\n"
"3:\n"
EX_TABLE(0b,3b) EX_TABLE(1b,2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len)
: "d" (__func), "a" (__param), "0" (-EFAULT),
"K" (ENOSYS), "K" (-ENOSYS + EFAULT) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/*
* 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;
asm volatile(
"0: .insn rre,0xb93f0000,%1,%1 \n" /* KLMD opcode */
"1: brc 1,0b \n" /* handle partial completion */
" ahi %0,%h6\n"
"2: ahi %0,%h7\n"
"3:\n"
EX_TABLE(0b,3b) EX_TABLE(1b,2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len)
: "d" (__func), "a" (__param), "0" (-EFAULT),
"K" (ENOSYS), "K" (-ENOSYS + EFAULT) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/*
* 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;
asm volatile(
"0: .insn rre,0xb91e0000,%1,%1 \n" /* KLAC opcode */
"1: brc 1,0b \n" /* handle partial completion */
" ahi %0,%h6\n"
"2: ahi %0,%h7\n"
"3:\n"
EX_TABLE(0b,3b) EX_TABLE(1b,2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len)
: "d" (__func), "a" (__param), "0" (-EFAULT),
"K" (ENOSYS), "K" (-ENOSYS + EFAULT) : "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
}
/**
* 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
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