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4a97abd443
This changes the AES core transform implementations to issue aese/aesmc
(and aesd/aesimc) in pairs. This enables a micro-architectural optimization
in recent Cortex-A5x cores that improves performance by 50-90%.
Measured performance in cycles per byte (Cortex-A57):
CBC enc CBC dec CTR
before 3.64 1.34 1.32
after 1.95 0.85 0.93
Note that this results in a ~5% performance decrease for older cores.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
130 lines
3.3 KiB
ArmAsm
130 lines
3.3 KiB
ArmAsm
/*
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* linux/arch/arm64/crypto/aes-ce.S - AES cipher for ARMv8 with
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* Crypto Extensions
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*
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* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#define AES_ENTRY(func) ENTRY(ce_ ## func)
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#define AES_ENDPROC(func) ENDPROC(ce_ ## func)
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.arch armv8-a+crypto
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/* preload all round keys */
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.macro load_round_keys, rounds, rk
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cmp \rounds, #12
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blo 2222f /* 128 bits */
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beq 1111f /* 192 bits */
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ld1 {v17.16b-v18.16b}, [\rk], #32
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1111: ld1 {v19.16b-v20.16b}, [\rk], #32
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2222: ld1 {v21.16b-v24.16b}, [\rk], #64
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ld1 {v25.16b-v28.16b}, [\rk], #64
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ld1 {v29.16b-v31.16b}, [\rk]
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.endm
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/* prepare for encryption with key in rk[] */
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.macro enc_prepare, rounds, rk, ignore
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load_round_keys \rounds, \rk
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.endm
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/* prepare for encryption (again) but with new key in rk[] */
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.macro enc_switch_key, rounds, rk, ignore
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load_round_keys \rounds, \rk
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.endm
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/* prepare for decryption with key in rk[] */
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.macro dec_prepare, rounds, rk, ignore
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load_round_keys \rounds, \rk
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.endm
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.macro do_enc_Nx, de, mc, k, i0, i1, i2, i3
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aes\de \i0\().16b, \k\().16b
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aes\mc \i0\().16b, \i0\().16b
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.ifnb \i1
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aes\de \i1\().16b, \k\().16b
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aes\mc \i1\().16b, \i1\().16b
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.ifnb \i3
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aes\de \i2\().16b, \k\().16b
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aes\mc \i2\().16b, \i2\().16b
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aes\de \i3\().16b, \k\().16b
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aes\mc \i3\().16b, \i3\().16b
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.endif
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.endif
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.endm
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/* up to 4 interleaved encryption rounds with the same round key */
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.macro round_Nx, enc, k, i0, i1, i2, i3
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.ifc \enc, e
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do_enc_Nx e, mc, \k, \i0, \i1, \i2, \i3
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.else
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do_enc_Nx d, imc, \k, \i0, \i1, \i2, \i3
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.endif
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.endm
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/* up to 4 interleaved final rounds */
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.macro fin_round_Nx, de, k, k2, i0, i1, i2, i3
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aes\de \i0\().16b, \k\().16b
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.ifnb \i1
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aes\de \i1\().16b, \k\().16b
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.ifnb \i3
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aes\de \i2\().16b, \k\().16b
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aes\de \i3\().16b, \k\().16b
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.endif
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.endif
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eor \i0\().16b, \i0\().16b, \k2\().16b
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.ifnb \i1
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eor \i1\().16b, \i1\().16b, \k2\().16b
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.ifnb \i3
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eor \i2\().16b, \i2\().16b, \k2\().16b
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eor \i3\().16b, \i3\().16b, \k2\().16b
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.endif
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.endif
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.endm
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/* up to 4 interleaved blocks */
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.macro do_block_Nx, enc, rounds, i0, i1, i2, i3
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cmp \rounds, #12
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blo 2222f /* 128 bits */
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beq 1111f /* 192 bits */
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round_Nx \enc, v17, \i0, \i1, \i2, \i3
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round_Nx \enc, v18, \i0, \i1, \i2, \i3
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1111: round_Nx \enc, v19, \i0, \i1, \i2, \i3
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round_Nx \enc, v20, \i0, \i1, \i2, \i3
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2222: .irp key, v21, v22, v23, v24, v25, v26, v27, v28, v29
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round_Nx \enc, \key, \i0, \i1, \i2, \i3
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.endr
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fin_round_Nx \enc, v30, v31, \i0, \i1, \i2, \i3
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.endm
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.macro encrypt_block, in, rounds, t0, t1, t2
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do_block_Nx e, \rounds, \in
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.endm
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.macro encrypt_block2x, i0, i1, rounds, t0, t1, t2
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do_block_Nx e, \rounds, \i0, \i1
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.endm
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.macro encrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
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do_block_Nx e, \rounds, \i0, \i1, \i2, \i3
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.endm
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.macro decrypt_block, in, rounds, t0, t1, t2
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do_block_Nx d, \rounds, \in
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.endm
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.macro decrypt_block2x, i0, i1, rounds, t0, t1, t2
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do_block_Nx d, \rounds, \i0, \i1
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.endm
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.macro decrypt_block4x, i0, i1, i2, i3, rounds, t0, t1, t2
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do_block_Nx d, \rounds, \i0, \i1, \i2, \i3
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.endm
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#include "aes-modes.S"
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