Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b1f933da authored by Felix Beck's avatar Felix Beck Committed by Martin Schwidefsky
Browse files

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



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: default avatarFelix Beck <felix.beck@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 2fcb3686

drivers/s390/crypto/ap_bus.c

+63 −0
Original line number Diff line number Diff line
@@ -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

drivers/s390/crypto/ap_bus.h

+2 −0
Original line number Diff line number Diff line
@@ -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_ */