CPU (macOS): support Apple Silicon frequency detection

src/detection/cpu/cpu_apple.c

@@ -20,6 +20,77 @@ static double detectCpuTemp(const FFstrbuf* cpuName)
     return result;
 }
 
+#ifdef __aarch64__
+#include "util/apple/cf_helpers.h"
+
+#include <IOKit/IOKitLib.h>
+
+static const char* detectFrequency(FFCPUResult* cpu)
+{
+    // https://github.com/giampaolo/psutil/pull/2222/files
+
+    CFMutableDictionaryRef matchDict = IOServiceMatching("AppleARMIODevice");
+    if (matchDict == NULL)
+        return "IOServiceMatching(\"AppleARMIODevice\") failed";
+
+    io_iterator_t iterator;
+    if(IOServiceGetMatchingServices(MACH_PORT_NULL, matchDict, &iterator) != kIOReturnSuccess)
+        return "IOServiceGetMatchingServices() failed";
+
+    io_registry_entry_t registryEntry;
+    while((registryEntry = IOIteratorNext(iterator)) != 0)
+    {
+        CFMutableDictionaryRef properties;
+        if(IORegistryEntryCreateCFProperties(registryEntry, &properties, kCFAllocatorDefault, kNilOptions) != kIOReturnSuccess)
+        {
+            IOObjectRelease(registryEntry);
+            continue;
+        }
+
+        io_name_t name;
+        if (IORegistryEntryGetName(registryEntry, name) != KERN_SUCCESS)
+            continue;
+        if (strcmp(name, "pmgr") != 0)
+            continue;
+
+        uint32_t pMin, eMin, aMax, pCoreLength;
+        ffCfDictGetData(properties, CFSTR("voltage-states5-sram"), 0, 4, (uint8_t*) &pMin, &pCoreLength); // pCore
+        ffCfDictGetData(properties, CFSTR("voltage-states1-sram"), 0, 4, (uint8_t*) &eMin, NULL); // eCore
+        cpu->frequencyMin = (pMin < eMin ? pMin : eMin) / (1000.0 * 1000 * 1000);
+
+        if (pCoreLength >= 8)
+        {
+            ffCfDictGetData(properties, CFSTR("voltage-states5-sram"), pCoreLength - 8, 4, (uint8_t*) &aMax, NULL);
+            cpu->frequencyMax = aMax / (1000.0 * 1000 * 1000);
+        }
+        else
+            cpu->frequencyMax = 0.0;
+
+        CFRelease(properties);
+        IOObjectRelease(registryEntry);
+    }
+
+    IOObjectRelease(iterator);
+    return NULL;
+}
+#else
+static const char* detectFrequency(FFCPUResult* cpu)
+{
+    cpu->frequencyMin = ffSysctlGetInt64("hw.cpufrequency_min", 0) / 1000.0 / 1000.0 / 1000.0;
+    cpu->frequencyMax = ffSysctlGetInt64("hw.cpufrequency_max", 0);
+    if(cpu->frequencyMax > 0.0)
+        cpu->frequencyMax /= 1000.0 * 1000.0 * 1000.0;
+    else
+    {
+        unsigned current = 0;
+        size_t size = sizeof(current);
+        if (sysctl((int[]){ CTL_HW, HW_CPU_FREQ }, 2, &current, &size, NULL, 0) == 0)
+            cpu->frequencyMax = (double) current / 1000.0 / 1000.0 / 1000.0;
+    }
+    return NULL;
+}
+#endif
+
 const char* ffDetectCPUImpl(const FFCPUOptions* options, FFCPUResult* cpu)
 {
     if (ffSysctlGetString("machdep.cpu.brand_string", &cpu->name) != NULL)
@@ -41,17 +112,7 @@ const char* ffDetectCPUImpl(const FFCPUOptions* options, FFCPUResult* cpu)
     if(cpu->coresOnline == 1)
         cpu->coresOnline = (uint16_t) ffSysctlGetInt("hw.activecpu", 1);
 
-    cpu->frequencyMin = ffSysctlGetInt64("hw.cpufrequency_min", 0) / 1000.0 / 1000.0 / 1000.0;
-    cpu->frequencyMax = ffSysctlGetInt64("hw.cpufrequency_max", 0);
-    if(cpu->frequencyMax > 0.0)
-        cpu->frequencyMax /= 1000.0 * 1000.0 * 1000.0;
-    else
-    {
-        unsigned current = 0;
-        size_t size = sizeof(current);
-        if (sysctl((int[]){ CTL_HW, HW_CPU_FREQ }, 2, &current, &size, NULL, 0) == 0)
-            cpu->frequencyMax = (double) current / 1000.0 / 1000.0 / 1000.0;
-    }
+    detectFrequency(cpu);
 
     cpu->temperature = options->temp ? detectCpuTemp(&cpu->name) : FF_CPU_TEMP_UNSET;
 

src/util/apple/cf_helpers.c

@@ -83,6 +83,27 @@ const char* ffCfDictGetInt(CFDictionaryRef dict, CFStringRef key, int* result)
     return "TypeID is neither 'CFNumber' nor 'CFData'";
 }
 
+const char* ffCfDictGetData(CFDictionaryRef dict, CFStringRef key, uint32_t offset, uint32_t size, uint8_t* result, uint32_t* length)
+{
+    CFTypeRef cf = (CFTypeRef)CFDictionaryGetValue(dict, key);
+    if(cf == NULL)
+        return "CFDictionaryGetValue() failed";
+
+    if(CFGetTypeID(cf) != CFDataGetTypeID())
+        return "TypeID is not 'CFData'";
+
+    CFIndex trueLength = CFDataGetLength((CFDataRef)cf);
+
+    if(trueLength < offset + size)
+        return "Data length is less than offset + size";
+
+    if(length)
+        *length = (uint32_t) trueLength;
+
+    CFDataGetBytes((CFDataRef)cf, CFRangeMake(offset, size), result);
+    return NULL;
+}
+
 const char* ffCfDictGetDict(CFDictionaryRef dict, CFStringRef key, CFDictionaryRef* result)
 {
     CFDictionaryRef cf = (CFDictionaryRef)CFDictionaryGetValue(dict, key);

src/util/apple/cf_helpers.h

@@ -11,6 +11,7 @@ const char* ffCfStrGetString(CFStringRef str, FFstrbuf* result);
 const char* ffCfDictGetString(CFDictionaryRef dict, CFStringRef key, FFstrbuf* result);
 const char* ffCfDictGetBool(CFDictionaryRef dict, CFStringRef key, bool* result);
 const char* ffCfDictGetInt(CFDictionaryRef dict, CFStringRef key, int* result);
+const char* ffCfDictGetData(CFDictionaryRef dict, CFStringRef key, uint32_t offset, uint32_t size, uint8_t* result, uint32_t* length);
 const char* ffCfDictGetDict(CFDictionaryRef dict, CFStringRef key, CFDictionaryRef* result);
 
 static inline CFNumberRef ffCfCreateInt(int value)