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host/include/aarch64: Implement clmul.h

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Detect PMULL in cpuinfo; implement the accel hook.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-12 18:21:19 +00:00
parent d6493dbb46
commit 055c99015a
3 changed files with 45 additions and 1 deletions
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1
host/include/aarch64/host/cpuinfo.h
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@ -10,6 +10,7 @@
#define CPUINFO_LSE (1u << 1)
#define CPUINFO_LSE2 (1u << 2)
#define CPUINFO_AES (1u << 3)
#define CPUINFO_PMULL (1u << 4)
/* Initialized with a constructor. */
extern unsigned cpuinfo;

41
host/include/aarch64/host/crypto/clmul.h Normal file
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@ -0,0 +1,41 @@
/*
* AArch64 specific clmul acceleration.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef AARCH64_HOST_CRYPTO_CLMUL_H
#define AARCH64_HOST_CRYPTO_CLMUL_H
#include "host/cpuinfo.h"
#include <arm_neon.h>
/*
* 64x64->128 pmull is available with FEAT_PMULL.
* Both FEAT_AES and FEAT_PMULL are covered under the same macro.
*/
#ifdef __ARM_FEATURE_AES
# define HAVE_CLMUL_ACCEL true
#else
# define HAVE_CLMUL_ACCEL likely(cpuinfo & CPUINFO_PMULL)
#endif
#if !defined(__ARM_FEATURE_AES) && defined(CONFIG_ARM_AES_BUILTIN)
# define ATTR_CLMUL_ACCEL __attribute__((target("+crypto")))
#else
# define ATTR_CLMUL_ACCEL
#endif
static inline Int128 ATTR_CLMUL_ACCEL
clmul_64_accel(uint64_t n, uint64_t m)
{
union { poly128_t v; Int128 s; } u;
#ifdef CONFIG_ARM_AES_BUILTIN
u.v = vmull_p64((poly64_t)n, (poly64_t)m);
#else
asm(".arch_extension aes\n\t"
"pmull %0.1q, %1.1d, %2.1d" : "=w"(u.v) : "w"(n), "w"(m));
#endif
return u.s;
}
#endif /* AARCH64_HOST_CRYPTO_CLMUL_H */

4
util/cpuinfo-aarch64.c
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@ -56,12 +56,14 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
unsigned long hwcap = qemu_getauxval(AT_HWCAP);
info |= (hwcap & HWCAP_ATOMICS ? CPUINFO_LSE : 0);
info |= (hwcap & HWCAP_USCAT ? CPUINFO_LSE2 : 0);
info |= (hwcap & HWCAP_AES ? CPUINFO_AES: 0);
info |= (hwcap & HWCAP_AES ? CPUINFO_AES : 0);
info |= (hwcap & HWCAP_PMULL ? CPUINFO_PMULL : 0);
#endif
#ifdef CONFIG_DARWIN
info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE") * CPUINFO_LSE;
info |= sysctl_for_bool("hw.optional.arm.FEAT_LSE2") * CPUINFO_LSE2;
info |= sysctl_for_bool("hw.optional.arm.FEAT_AES") * CPUINFO_AES;
info |= sysctl_for_bool("hw.optional.arm.FEAT_PMULL") * CPUINFO_PMULL;
#endif
cpuinfo = info;