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

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 <>
Signed-off-by: default avatarHerbert Xu <>
parent 7edc86cb
......@@ -107,17 +107,23 @@
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
st1 {v8.2d-v11.2d}, [x19]
b 0b
b 1b
/* store new state */
3: st1 {v8.2d-v11.2d}, [x0]
3: st1 {v8.2d-v11.2d}, [x19]
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment