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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #if !defined(__STDC_FORMAT_MACROS)
- #define __STDC_FORMAT_MACROS
- #endif
-
- #include <openssl/cpu.h>
-
-
- #if !defined(OPENSSL_NO_ASM) && (defined(OPENSSL_X86) || defined(OPENSSL_X86_64))
-
- #include <inttypes.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
-
- #if defined(OPENSSL_WINDOWS)
- #pragma warning(push, 3)
- #include <immintrin.h>
- #include <intrin.h>
- #pragma warning(pop)
- #endif
-
-
- /* OPENSSL_cpuid runs the cpuid instruction. |leaf| is passed in as EAX and ECX
- * is set to zero. It writes EAX, EBX, ECX, and EDX to |*out_eax| through
- * |*out_edx|. */
- static void OPENSSL_cpuid(uint32_t *out_eax, uint32_t *out_ebx,
- uint32_t *out_ecx, uint32_t *out_edx, uint32_t leaf) {
- #if defined(OPENSSL_WINDOWS)
- int tmp[4];
- __cpuid(tmp, (int)leaf);
- *out_eax = (uint32_t)tmp[0];
- *out_ebx = (uint32_t)tmp[1];
- *out_ecx = (uint32_t)tmp[2];
- *out_edx = (uint32_t)tmp[3];
- #elif defined(__pic__) && defined(OPENSSL_32_BIT)
- /* Inline assembly may not clobber the PIC register. For 32-bit, this is EBX.
- * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47602. */
- __asm__ volatile (
- "xor %%ecx, %%ecx\n"
- "mov %%ebx, %%edi\n"
- "cpuid\n"
- "xchg %%edi, %%ebx\n"
- : "=a"(*out_eax), "=D"(*out_ebx), "=c"(*out_ecx), "=d"(*out_edx)
- : "a"(leaf)
- );
- #else
- __asm__ volatile (
- "xor %%ecx, %%ecx\n"
- "cpuid\n"
- : "=a"(*out_eax), "=b"(*out_ebx), "=c"(*out_ecx), "=d"(*out_edx)
- : "a"(leaf)
- );
- #endif
- }
-
- /* OPENSSL_xgetbv returns the value of an Intel Extended Control Register (XCR).
- * Currently only XCR0 is defined by Intel so |xcr| should always be zero. */
- static uint64_t OPENSSL_xgetbv(uint32_t xcr) {
- #if defined(OPENSSL_WINDOWS)
- return (uint64_t)_xgetbv(xcr);
- #else
- uint32_t eax, edx;
- __asm__ volatile ("xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr));
- return (((uint64_t)edx) << 32) | eax;
- #endif
- }
-
- /* handle_cpu_env applies the value from |in| to the CPUID values in |out[0]|
- * and |out[1]|. See the comment in |OPENSSL_cpuid_setup| about this. */
- static void handle_cpu_env(uint32_t *out, const char *in) {
- const int invert = in[0] == '~';
- uint64_t v;
-
- if (!sscanf(in + invert, "%" PRIi64, &v)) {
- return;
- }
-
- if (invert) {
- out[0] &= ~v;
- out[1] &= ~(v >> 32);
- } else {
- out[0] = v;
- out[1] = v >> 32;
- }
- }
-
- void OPENSSL_cpuid_setup(void) {
- /* Determine the vendor and maximum input value. */
- uint32_t eax, ebx, ecx, edx;
- OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0);
-
- uint32_t num_ids = eax;
-
- int is_intel = ebx == 0x756e6547 /* Genu */ &&
- edx == 0x49656e69 /* ineI */ &&
- ecx == 0x6c65746e /* ntel */;
- int is_amd = ebx == 0x68747541 /* Auth */ &&
- edx == 0x69746e65 /* enti */ &&
- ecx == 0x444d4163 /* cAMD */;
-
- int has_amd_xop = 0;
- if (is_amd) {
- /* AMD-specific logic.
- * See http://developer.amd.com/wordpress/media/2012/10/254811.pdf */
- OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0x80000000);
- uint32_t num_extended_ids = eax;
- if (num_extended_ids >= 0x80000001) {
- OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0x80000001);
- if (ecx & (1 << 11)) {
- has_amd_xop = 1;
- }
- }
- }
-
- uint32_t extended_features = 0;
- if (num_ids >= 7) {
- OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 7);
- extended_features = ebx;
- }
-
- /* Determine the number of cores sharing an L1 data cache to adjust the
- * hyper-threading bit. */
- uint32_t cores_per_cache = 0;
- if (is_amd) {
- /* AMD CPUs never share an L1 data cache between threads but do set the HTT
- * bit on multi-core CPUs. */
- cores_per_cache = 1;
- } else if (num_ids >= 4) {
- /* TODO(davidben): The Intel manual says this CPUID leaf enumerates all
- * caches using ECX and doesn't say which is first. Does this matter? */
- OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 4);
- cores_per_cache = 1 + ((eax >> 14) & 0xfff);
- }
-
- OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 1);
-
- /* Adjust the hyper-threading bit. */
- if (edx & (1 << 28)) {
- uint32_t num_logical_cores = (ebx >> 16) & 0xff;
- if (cores_per_cache == 1 || num_logical_cores <= 1) {
- edx &= ~(1 << 28);
- }
- }
-
- /* Reserved bit #20 was historically repurposed to control the in-memory
- * representation of RC4 state. Always set it to zero. */
- edx &= ~(1 << 20);
-
- /* Reserved bit #30 is repurposed to signal an Intel CPU. */
- if (is_intel) {
- edx |= (1 << 30);
- } else {
- edx &= ~(1 << 30);
- }
-
- /* The SDBG bit is repurposed to denote AMD XOP support. */
- if (has_amd_xop) {
- ecx |= (1 << 11);
- } else {
- ecx &= ~(1 << 11);
- }
-
- uint64_t xcr0 = 0;
- if (ecx & (1 << 27)) {
- /* XCR0 may only be queried if the OSXSAVE bit is set. */
- xcr0 = OPENSSL_xgetbv(0);
- }
- /* See Intel manual, section 14.3. */
- if ((xcr0 & 6) != 6) {
- /* YMM registers cannot be used. */
- ecx &= ~(1 << 28); /* AVX */
- ecx &= ~(1 << 12); /* FMA */
- ecx &= ~(1 << 11); /* AMD XOP */
- extended_features &= ~(1 << 5); /* AVX2 */
- }
-
- OPENSSL_ia32cap_P[0] = edx;
- OPENSSL_ia32cap_P[1] = ecx;
- OPENSSL_ia32cap_P[2] = extended_features;
- OPENSSL_ia32cap_P[3] = 0;
-
- const char *env1, *env2;
- env1 = getenv("OPENSSL_ia32cap");
- if (env1 == NULL) {
- return;
- }
-
- /* OPENSSL_ia32cap can contain zero, one or two values, separated with a ':'.
- * Each value is a 64-bit, unsigned value which may start with "0x" to
- * indicate a hex value. Prior to the 64-bit value, a '~' may be given.
- *
- * If '~' isn't present, then the value is taken as the result of the CPUID.
- * Otherwise the value is inverted and ANDed with the probed CPUID result.
- *
- * The first value determines OPENSSL_ia32cap_P[0] and [1]. The second [2]
- * and [3]. */
-
- handle_cpu_env(&OPENSSL_ia32cap_P[0], env1);
- env2 = strchr(env1, ':');
- if (env2 != NULL) {
- handle_cpu_env(&OPENSSL_ia32cap_P[2], env2 + 1);
- }
- }
-
- #endif /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64) */
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