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Commit df80c038 authored by Harald Freudenberger's avatar Harald Freudenberger Committed by Martin Schwidefsky
Browse files

s390/zcrypt: Review inline assembler constraints. 



Reviewed and adapted the register use and asm constraints
of the C inline assembler functions in accordance to the
the AP instructions specifications.

Signed-off-by: default avatarHarald Freudenberger <freude@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent ea3c4185

drivers/s390/crypto/ap_asm.h

+23 −17
Original line number Diff line number Diff line
@@ -20,14 +20,16 @@ static inline int ap_instructions_available(void) 
{

	register unsigned long reg0 asm ("0") = AP_MKQID(0, 0);

	register unsigned long reg1 asm ("1") = -ENODEV;

	register unsigned long reg2 asm ("2") = 0UL;

	register unsigned long reg2 asm ("2");



	asm volatile(

		"   .long 0xb2af0000\n"		/* PQAP(TAPQ) */

		"0: la    %1,0\n"

		"0: la    %0,0\n"

		"1:\n"

		EX_TABLE(0b, 1b)

		: "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc");

		: "+d" (reg1), "=d" (reg2)

		: "d" (reg0)

		: "cc");

	return reg1;

}
@@ -42,10 +44,12 @@ static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info) 
{

	register unsigned long reg0 asm ("0") = qid;

	register struct ap_queue_status reg1 asm ("1");

	register unsigned long reg2 asm ("2") = 0UL;

	register unsigned long reg2 asm ("2");



	asm volatile(".long 0xb2af0000"		/* PQAP(TAPQ) */

		     : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");

		     : "=d" (reg1), "=d" (reg2)

		     : "d" (reg0)

		     : "cc");

	if (info)

		*info = reg2;

	return reg1;
@@ -59,13 +63,14 @@ static inline struct ap_queue_status ap_tapq(ap_qid_t qid, unsigned long *info) 
 */

static inline struct ap_queue_status ap_rapq(ap_qid_t qid)

{

	register unsigned long reg0 asm ("0") = qid | 0x01000000UL;

	register unsigned long reg0 asm ("0") = qid | (1UL << 24);

	register struct ap_queue_status reg1 asm ("1");

	register unsigned long reg2 asm ("2") = 0UL;



	asm volatile(

		".long 0xb2af0000"		/* PQAP(RAPQ) */

		: "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");

		: "=d" (reg1)

		: "d" (reg0)

		: "cc");

	return reg1;

}
@@ -107,8 +112,8 @@ static inline struct ap_queue_status ap_aqic(ap_qid_t qid, 


	asm volatile(

		".long 0xb2af0000"		/* PQAP(AQIC) */

		: "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)

		:

		: "=d" (reg1_out)

		: "d" (reg0), "d" (reg1_in), "d" (reg2)

		: "cc");

	return reg1_out;

}
@@ -120,17 +125,17 @@ static inline struct ap_queue_status ap_aqic(ap_qid_t qid, 
 */

static inline int ap_qci(void *config)

{

	register unsigned long reg0 asm ("0") = 0x04000000UL;

	register unsigned long reg0 asm ("0") = 4UL << 24;

	register unsigned long reg1 asm ("1") = -EINVAL;

	register void *reg2 asm ("2") = (void *) config;



	asm volatile(

		".long 0xb2af0000\n"		/* PQAP(QCI) */

		"0: la    %1,0\n"

		"0: la    %0,0\n"

		"1:\n"

		EX_TABLE(0b, 1b)

		: "+d" (reg0), "+d" (reg1), "+d" (reg2)

		:

		: "+d" (reg1)

		: "d" (reg0), "d" (reg2)

		: "cc", "memory");



	return reg1;
@@ -169,12 +174,13 @@ static inline struct ap_queue_status ap_qact(ap_qid_t qid, int ifbit, 
		| ((ifbit & 0x01) << 22);

	register unsigned long reg1_in asm ("1") = apinfo->val;

	register struct ap_queue_status reg1_out asm ("1");

	register unsigned long reg2 asm ("2") = 0;

	register unsigned long reg2 asm ("2");



	asm volatile(

		".long 0xb2af0000"		/* PQAP(QACT) */

		: "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)

		: : "cc");

		: "+d" (reg1_in), "=d" (reg1_out), "=d" (reg2)

		: "d" (reg0)

		: "cc");

	apinfo->val = reg2;

	return reg1_out;

}