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[S390] zcrypt: Introduce check for 4096 bit support.

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Implemented an asm in the ap bus and made it accessible for the card
specific parts of the zcrypt driver. Thus when a cex3a is recognized
a check can be performed to dermine whether the card supports 4096 bit
RSA keys.

Signed-off-by: Felix Beck <felix.beck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Felix Beck 2011-01-05 12:47:44 +01:00 committed by Martin Schwidefsky
parent 2fcb3686e1
commit b1f933da57
2 changed files with 65 additions and 0 deletions
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63
drivers/s390/crypto/ap_bus.c
View file

@ -222,6 +222,69 @@ ap_queue_interruption_control(ap_qid_t qid, void *ind)
}
#endif
static inline struct ap_queue_status __ap_4096_commands_available(ap_qid_t qid,
int *support)
{
register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23);
register struct ap_queue_status reg1 asm ("1");
register unsigned long reg2 asm ("2") = 0UL;
asm volatile(
".long 0xb2af0000\n"
"0: la %1,0\n"
"1:\n"
EX_TABLE(0b, 1b)
: "+d" (reg0), "=d" (reg1), "=d" (reg2)
:
: "cc");
if (reg2 & 0x6000000000000000ULL)
*support = 1;
else
*support = 0;
return reg1;
}
/**
* ap_4096_commands_availablen(): Check for availability of 4096 bit RSA
* support.
* @qid: The AP queue number
*
* Returns 1 if 4096 bit RSA keys are support fo the AP, returns 0 if not.
*/
int ap_4096_commands_available(ap_qid_t qid)
{
struct ap_queue_status status;
int i, support = 0;
status = __ap_4096_commands_available(qid, &support);
for (i = 0; i < AP_MAX_RESET; i++) {
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
return support;
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_BUSY:
break;
case AP_RESPONSE_Q_NOT_AVAIL:
case AP_RESPONSE_DECONFIGURED:
case AP_RESPONSE_CHECKSTOPPED:
case AP_RESPONSE_INVALID_ADDRESS:
return 0;
case AP_RESPONSE_OTHERWISE_CHANGED:
break;
default:
break;
}
if (i < AP_MAX_RESET - 1) {
udelay(5);
status = __ap_4096_commands_available(qid, &support);
}
}
return support;
}
EXPORT_SYMBOL(ap_4096_commands_available);
/**
* ap_queue_enable_interruption(): Enable interruption on an AP.
* @qid: The AP queue number

2
drivers/s390/crypto/ap_bus.h
View file

@ -196,4 +196,6 @@ void ap_flush_queue(struct ap_device *ap_dev);
int ap_module_init(void);
void ap_module_exit(void);
int ap_4096_commands_available(ap_qid_t qid);
#endif /* _AP_BUS_H_ */