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/*
* Copyright (C) 2015 Martin Willi
* Copyright (C) 2015 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "cpu_feature.h"
#if defined __i386__ || defined(__x86_64__)
typedef enum {
/* Generic CPUID(1) flags */
CPUID1_EDX_MMX = (1 << 23),
CPUID1_EDX_SSE = (1 << 25),
CPUID1_EDX_SSE2 = (1 << 26),
CPUID1_ECX_SSE3 = (1 << 0),
CPUID1_ECX_PCLMULQDQ = (1 << 1),
CPUID1_ECX_SSSE3 = (1 << 9),
CPUID1_ECX_SSE41 = (1 << 19),
CPUID1_ECX_SSE42 = (1 << 20),
CPUID1_ECX_AESNI = (1 << 25),
CPUID1_ECX_AVX = (1 << 28),
CPUID1_ECX_RDRAND = (1 << 30),
/* For CentaurHauls cpuid(0xC0000001) */
CPUIDC1_EDX_RNG_AVAILABLE = (1 << 2),
CPUIDC1_EDX_RNG_ENABLED = (1 << 3),
CPUIDC1_EDX_ACE_AVAILABLE = (1 << 6),
CPUIDC1_EDX_ACE_ENABLED = (1 << 7),
CPUIDC1_EDX_ACE2_AVAILABLE = (1 << 8),
CPUIDC1_EDX_ACE2_ENABLED = (1 << 9),
CPUIDC1_EDX_PHE_AVAILABLE = (1 << 10),
CPUIDC1_EDX_PHE_ENABLED = (1 << 11),
CPUIDC1_EDX_PMM_AVAILABLE = (1 << 12),
CPUIDC1_EDX_PMM_ENABLED = (1 << 13),
} cpuid_flag_t;
/**
* Get cpuid for info, return eax, ebx, ecx and edx.
* -fPIC requires to save ebx on IA-32.
*/
static void cpuid(u_int op, u_int *a, u_int *b, u_int *c, u_int *d)
{
#ifdef __x86_64__
asm("cpuid" : "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d) : "a" (op));
#else /* __i386__ */
asm("pushl %%ebx;"
"cpuid;"
"movl %%ebx, %1;"
"popl %%ebx;"
: "=a" (*a), "=r" (*b), "=c" (*c), "=d" (*d) : "a" (op));
#endif /* __x86_64__ / __i386__*/
}
/**
* Return feature if flag in reg, flag-to-feature
*/
static inline cpu_feature_t f2f(u_int reg, cpuid_flag_t flag, cpu_feature_t f)
{
if (reg & flag)
{
return f;
}
return 0;
}
/**
* Get features for a Via "CentaurHauls" CPU
*/
static cpu_feature_t get_via_features()
{
cpu_feature_t f = 0;
u_int a, b, c, d;
cpuid(0xc0000001, &a, &b, &c, &d);
f |= f2f(d, CPUIDC1_EDX_RNG_AVAILABLE, CPU_FEATURE_PADLOCK_RNG_AVAILABLE);
f |= f2f(d, CPUIDC1_EDX_RNG_ENABLED, CPU_FEATURE_PADLOCK_RNG_ENABLED);
f |= f2f(d, CPUIDC1_EDX_ACE_AVAILABLE, CPU_FEATURE_PADLOCK_ACE_AVAILABLE);
f |= f2f(d, CPUIDC1_EDX_ACE_ENABLED, CPU_FEATURE_PADLOCK_ACE_ENABLED);
f |= f2f(d, CPUIDC1_EDX_ACE2_AVAILABLE, CPU_FEATURE_PADLOCK_ACE2_AVAILABLE);
f |= f2f(d, CPUIDC1_EDX_ACE2_ENABLED, CPU_FEATURE_PADLOCK_ACE2_ENABLED);
f |= f2f(d, CPUIDC1_EDX_PHE_AVAILABLE, CPU_FEATURE_PADLOCK_PHE_AVAILABLE);
f |= f2f(d, CPUIDC1_EDX_PHE_ENABLED, CPU_FEATURE_PADLOCK_PHE_ENABLED);
f |= f2f(d, CPUIDC1_EDX_PMM_AVAILABLE, CPU_FEATURE_PADLOCK_PMM_AVAILABLE);
f |= f2f(d, CPUIDC1_EDX_PMM_ENABLED, CPU_FEATURE_PADLOCK_PMM_ENABLED);
return f;
}
/**
* See header.
*/
cpu_feature_t cpu_feature_get_all()
{
char vendor[3 * sizeof(u_int32_t) + 1];
cpu_feature_t f = 0;
u_int a, b, c, d;
cpuid(0, &a, &b, &c, &d);
/* VendorID string is in b-d-c (yes, in this order) */
snprintf(vendor, sizeof(vendor), "%.4s%.4s%.4s", &b, &d, &c);
cpuid(1, &a, &b, &c, &d);
/* check common x86 features for CPUID(1) */
f |= f2f(d, CPUID1_EDX_MMX, CPU_FEATURE_MMX);
f |= f2f(d, CPUID1_EDX_SSE, CPU_FEATURE_SSE);
f |= f2f(d, CPUID1_EDX_SSE2, CPU_FEATURE_SSE2);
f |= f2f(c, CPUID1_ECX_SSE3, CPU_FEATURE_SSE3);
f |= f2f(c, CPUID1_ECX_PCLMULQDQ, CPU_FEATURE_PCLMULQDQ);
f |= f2f(c, CPUID1_ECX_SSSE3, CPU_FEATURE_SSSE3);
f |= f2f(c, CPUID1_ECX_SSE41, CPU_FEATURE_SSE41);
f |= f2f(c, CPUID1_ECX_SSE42, CPU_FEATURE_SSE42);
f |= f2f(c, CPUID1_ECX_AESNI, CPU_FEATURE_AESNI);
f |= f2f(c, CPUID1_ECX_AVX, CPU_FEATURE_AVX);
f |= f2f(c, CPUID1_ECX_RDRAND, CPU_FEATURE_RDRAND);
if (streq(vendor, "CentaurHauls"))
{
cpuid(0xc0000000, &a, &b, &c, &d);
/* check Centaur Extended Feature Flags */
if (a >= 0xc0000001)
{
f |= get_via_features();
}
}
return f;
}
#else /* !x86 */
/**
* See header.
*/
cpu_feature_t cpu_feature_get_all()
{
return 0;
}
#endif
/**
* See header.
*/
bool cpu_feature_available(cpu_feature_t feature)
{
return (cpu_feature_get_all() & feature) == feature;
}
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