summaryrefslogtreecommitdiffstats
path: root/darwin/PlatformHelpers.c
diff options
context:
space:
mode:
Diffstat (limited to 'darwin/PlatformHelpers.c')
-rw-r--r--darwin/PlatformHelpers.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/darwin/PlatformHelpers.c b/darwin/PlatformHelpers.c
new file mode 100644
index 0000000..a4ea82b
--- /dev/null
+++ b/darwin/PlatformHelpers.c
@@ -0,0 +1,125 @@
+/*
+htop - darwin/PlatformHelpers.c
+(C) 2018 Pierre Malhaire, 2020-2021 htop dev team, 2021 Alexander Momchilov
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "darwin/PlatformHelpers.h"
+
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/sysctl.h>
+
+#include "CRT.h"
+
+#ifdef HAVE_MACH_MACH_TIME_H
+#include <mach/mach_time.h>
+#endif
+
+
+void Platform_GetKernelVersion(KernelVersion* k) {
+ static KernelVersion cachedKernelVersion;
+
+ if (!cachedKernelVersion.major) {
+ // just in case it fails someday
+ cachedKernelVersion = (KernelVersion) { -1, -1, -1 };
+ char str[256] = {0};
+ size_t size = sizeof(str);
+ int ret = sysctlbyname("kern.osrelease", str, &size, NULL, 0);
+ if (ret == 0) {
+ sscanf(str, "%hd.%hd.%hd", &cachedKernelVersion.major, &cachedKernelVersion.minor, &cachedKernelVersion.patch);
+ }
+ }
+ memcpy(k, &cachedKernelVersion, sizeof(cachedKernelVersion));
+}
+
+int Platform_CompareKernelVersion(KernelVersion v) {
+ struct KernelVersion actualVersion;
+ Platform_GetKernelVersion(&actualVersion);
+
+ if (actualVersion.major != v.major) {
+ return actualVersion.major - v.major;
+ }
+ if (actualVersion.minor != v.minor) {
+ return actualVersion.minor - v.minor;
+ }
+ if (actualVersion.patch != v.patch) {
+ return actualVersion.patch - v.patch;
+ }
+
+ return 0;
+}
+
+bool Platform_KernelVersionIsBetween(KernelVersion lowerBound, KernelVersion upperBound) {
+ return 0 <= Platform_CompareKernelVersion(lowerBound)
+ && Platform_CompareKernelVersion(upperBound) < 0;
+}
+
+void Platform_getCPUBrandString(char* cpuBrandString, size_t cpuBrandStringSize) {
+ if (sysctlbyname("machdep.cpu.brand_string", cpuBrandString, &cpuBrandStringSize, NULL, 0) == -1) {
+ fprintf(stderr,
+ "WARN: Unable to determine the CPU brand string.\n"
+ "errno: %i, %s\n", errno, strerror(errno));
+
+ String_safeStrncpy(cpuBrandString, "UNKNOWN!", cpuBrandStringSize);
+ }
+}
+
+// Adapted from https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment
+bool Platform_isRunningTranslated(void) {
+ int ret = 0;
+ size_t size = sizeof(ret);
+ errno = 0;
+ if (sysctlbyname("sysctl.proc_translated", &ret, &size, NULL, 0) == -1) {
+ if (errno == ENOENT)
+ return false;
+
+ fprintf(stderr,
+ "WARN: Could not determine if this process was running in a translation environment like Rosetta 2.\n"
+ "Assuming that we're not.\n"
+ "errno: %i, %s\n", errno, strerror(errno));
+
+ return false;
+ }
+ return ret;
+}
+
+double Platform_calculateNanosecondsPerMachTick(void) {
+ // Check if we can determine the timebase used on this system.
+ // If the API is unavailable assume we get our timebase in nanoseconds.
+#ifndef HAVE_MACH_TIMEBASE_INFO
+ return 1.0;
+#else
+ mach_timebase_info_data_t info;
+
+ /* WORKAROUND for `mach_timebase_info` giving incorrect values on M1 under Rosetta 2.
+ * rdar://FB9546856 https://openradar.appspot.com/radar?id=5055988478509056
+ *
+ * We don't know exactly what feature/attribute of the M1 chip causes this mistake under Rosetta 2.
+ * Until we have more Apple ARM chips to compare against, the best we can do is special-case
+ * the "Apple M1" chip specifically when running under Rosetta 2.
+ */
+
+ char cpuBrandString[1024] = "";
+ Platform_getCPUBrandString(cpuBrandString, sizeof(cpuBrandString));
+
+ bool isRunningUnderRosetta2 = Platform_isRunningTranslated();
+
+ // Kernel version 20.0.0 is macOS 11.0 (Big Sur)
+ bool isBuggedVersion = Platform_KernelVersionIsBetween((KernelVersion) {20, 0, 0}, (KernelVersion) {999, 999, 999});
+
+ if (isRunningUnderRosetta2 && String_eq(cpuBrandString, "Apple M1") && isBuggedVersion) {
+ // In this case `mach_timebase_info` provides the wrong value, so we hard-code the correct factor,
+ // as determined from `mach_timebase_info` when the process running natively.
+ info = (mach_timebase_info_data_t) { .numer = 125, .denom = 3 };
+ } else {
+ // No workarounds needed, use the OS-provided value.
+ mach_timebase_info(&info);
+ }
+
+ return (double)info.numer / (double)info.denom;
+#endif
+}