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

Commit 6caf7adc authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu
Browse files

crypto: arm64/sha512-ce - yield NEON after every block of input 



Avoid excessive scheduling delays under a preemptible kernel by
conditionally yielding the NEON after every block of input.

Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 7edc86cb

arch/arm64/crypto/sha512-ce-core.S

+21 −6
Original line number Diff line number Diff line
@@ -107,17 +107,23 @@ 
	 */

	.text

ENTRY(sha512_ce_transform)

	frame_push	3



	mov		x19, x0

	mov		x20, x1

	mov		x21, x2



	/* load state */

	ld1		{v8.2d-v11.2d}, [x0]

0:	ld1		{v8.2d-v11.2d}, [x19]



	/* load first 4 round constants */

	adr_l		x3, .Lsha512_rcon

	ld1		{v20.2d-v23.2d}, [x3], #64



	/* load input */

0:	ld1		{v12.2d-v15.2d}, [x1], #64

	ld1		{v16.2d-v19.2d}, [x1], #64

	sub		w2, w2, #1

1:	ld1		{v12.2d-v15.2d}, [x20], #64

	ld1		{v16.2d-v19.2d}, [x20], #64

	sub		w21, w21, #1



CPU_LE(	rev64		v12.16b, v12.16b	)

CPU_LE(	rev64		v13.16b, v13.16b	)
@@ -196,9 +202,18 @@ CPU_LE( rev64 v19.16b, v19.16b ) 
	add		v11.2d, v11.2d, v3.2d



	/* handled all input blocks? */

	cbnz		w2, 0b

	cbz		w21, 3f



	if_will_cond_yield_neon

	st1		{v8.2d-v11.2d}, [x19]

	do_cond_yield_neon

	b		0b

	endif_yield_neon



	b		1b



	/* store new state */

3:	st1		{v8.2d-v11.2d}, [x0]

3:	st1		{v8.2d-v11.2d}, [x19]

	frame_pop

	ret

ENDPROC(sha512_ce_transform)