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-rw-r--r--src/crypto/cpu-intel.c108
1 files changed, 54 insertions, 54 deletions
diff --git a/src/crypto/cpu-intel.c b/src/crypto/cpu-intel.c
index ef327df0..127fa57a 100644
--- a/src/crypto/cpu-intel.c
+++ b/src/crypto/cpu-intel.c
@@ -68,7 +68,7 @@
#include <stdlib.h>
#include <string.h>
-#if defined(OPENSSL_WINDOWS)
+#if defined(_MSC_VER)
OPENSSL_MSVC_PRAGMA(warning(push, 3))
#include <immintrin.h>
#include <intrin.h>
@@ -78,12 +78,12 @@ OPENSSL_MSVC_PRAGMA(warning(pop))
#include "internal.h"
-/* 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|. */
+// 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)
+#if defined(_MSC_VER)
int tmp[4];
__cpuid(tmp, (int)leaf);
*out_eax = (uint32_t)tmp[0];
@@ -91,8 +91,8 @@ static void OPENSSL_cpuid(uint32_t *out_eax, uint32_t *out_ebx,
*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. */
+ // 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"
@@ -111,10 +111,10 @@ static void OPENSSL_cpuid(uint32_t *out_eax, uint32_t *out_ebx,
#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. */
+// 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)
+#if defined(_MSC_VER)
return (uint64_t)_xgetbv(xcr);
#else
uint32_t eax, edx;
@@ -123,8 +123,8 @@ static uint64_t OPENSSL_xgetbv(uint32_t xcr) {
#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. */
+// 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;
@@ -143,7 +143,7 @@ static void handle_cpu_env(uint32_t *out, const char *in) {
}
void OPENSSL_cpuid_setup(void) {
- /* Determine the vendor and maximum input value. */
+ // Determine the vendor and maximum input value.
uint32_t eax, ebx, ecx, edx;
OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0);
@@ -158,8 +158,8 @@ void OPENSSL_cpuid_setup(void) {
int has_amd_xop = 0;
if (is_amd) {
- /* AMD-specific logic.
- * See http://developer.amd.com/wordpress/media/2012/10/254811.pdf */
+ // 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) {
@@ -176,23 +176,23 @@ void OPENSSL_cpuid_setup(void) {
extended_features = ebx;
}
- /* Determine the number of cores sharing an L1 data cache to adjust the
- * hyper-threading bit. */
+ // 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. */
+ // 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? */
+ // 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. */
+ // 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) {
@@ -200,17 +200,17 @@ void OPENSSL_cpuid_setup(void) {
}
}
- /* Reserved bit #20 was historically repurposed to control the in-memory
- * representation of RC4 state. Always set it to zero. */
+ // 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. */
+ // Reserved bit #30 is repurposed to signal an Intel CPU.
if (is_intel) {
edx |= (1 << 30);
- /* Clear the XSAVE bit on Knights Landing to mimic Silvermont. This enables
- * some Silvermont-specific codepaths which perform better. See OpenSSL
- * commit 64d92d74985ebb3d0be58a9718f9e080a14a8e7f. */
+ // Clear the XSAVE bit on Knights Landing to mimic Silvermont. This enables
+ // some Silvermont-specific codepaths which perform better. See OpenSSL
+ // commit 64d92d74985ebb3d0be58a9718f9e080a14a8e7f.
if ((eax & 0x0fff0ff0) == 0x00050670 /* Knights Landing */ ||
(eax & 0x0fff0ff0) == 0x00080650 /* Knights Mill (per SDE) */) {
ecx &= ~(1 << 26);
@@ -219,7 +219,7 @@ void OPENSSL_cpuid_setup(void) {
edx &= ~(1 << 30);
}
- /* The SDBG bit is repurposed to denote AMD XOP support. */
+ // The SDBG bit is repurposed to denote AMD XOP support.
if (has_amd_xop) {
ecx |= (1 << 11);
} else {
@@ -228,31 +228,31 @@ void OPENSSL_cpuid_setup(void) {
uint64_t xcr0 = 0;
if (ecx & (1 << 27)) {
- /* XCR0 may only be queried if the OSXSAVE bit is set. */
+ // XCR0 may only be queried if the OSXSAVE bit is set.
xcr0 = OPENSSL_xgetbv(0);
}
- /* See Intel manual, volume 1, section 14.3. */
+ // See Intel manual, volume 1, 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 */
- /* Clear AVX2 and AVX512* bits.
- *
- * TODO(davidben): Should bits 17 and 26-28 also be cleared? Upstream
- * doesn't clear those. */
+ // YMM registers cannot be used.
+ ecx &= ~(1 << 28); // AVX
+ ecx &= ~(1 << 12); // FMA
+ ecx &= ~(1 << 11); // AMD XOP
+ // Clear AVX2 and AVX512* bits.
+ //
+ // TODO(davidben): Should bits 17 and 26-28 also be cleared? Upstream
+ // doesn't clear those.
extended_features &=
~((1 << 5) | (1 << 16) | (1 << 21) | (1 << 30) | (1 << 31));
}
- /* See Intel manual, volume 1, section 15.2. */
+ // See Intel manual, volume 1, section 15.2.
if ((xcr0 & 0xe6) != 0xe6) {
- /* Clear AVX512F. Note we don't touch other AVX512 extensions because they
- * can be used with YMM. */
+ // Clear AVX512F. Note we don't touch other AVX512 extensions because they
+ // can be used with YMM.
extended_features &= ~(1 << 16);
}
- /* Disable ADX instructions on Knights Landing. See OpenSSL commit
- * 64d92d74985ebb3d0be58a9718f9e080a14a8e7f. */
+ // Disable ADX instructions on Knights Landing. See OpenSSL commit
+ // 64d92d74985ebb3d0be58a9718f9e080a14a8e7f.
if ((ecx & (1 << 26)) == 0) {
extended_features &= ~(1 << 19);
}
@@ -268,15 +268,15 @@ void OPENSSL_cpuid_setup(void) {
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]. */
+ // 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, ':');
@@ -285,4 +285,4 @@ void OPENSSL_cpuid_setup(void) {
}
}
-#endif /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64) */
+#endif // !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64)
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-25 09:45:10 +0000