From 8d10a03adc3515f1f8bc2a03d4d62806346b0e7a Mon Sep 17 00:00:00 2001
From: Er2 <er2@dismail.de>
Date: Mon, 19 Aug 2024 10:21:41 +0300
Subject: [PATCH] [v1.06][FreeBSD][Apple] Implement fallback frequency
 calculation (#251)

---
 Makefile            |  4 ++++
 src/common/sysctl.h |  8 ++++++++
 src/x86/cpuid.c     | 15 ++++++++++++++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index a4e5d13..6e7d085 100644
--- a/Makefile
+++ b/Makefile
@@ -30,6 +30,10 @@ ifneq ($(OS),Windows_NT)
 			HEADERS += $(SRC_DIR)freq/freq.h
 			CFLAGS += -pthread
 		endif
+		ifeq ($(os), FreeBSD)
+			SOURCE += $(SRC_COMMON)sysctl.c
+			HEADERS += $(SRC_COMMON)sysctl.h
+		endif
 		CFLAGS += -DARCH_X86 -std=c99 -fstack-protector-all
 	else ifeq ($(arch), $(filter $(arch), ppc64le ppc64 ppcle ppc))
 		SRC_DIR=src/ppc/
diff --git a/src/common/sysctl.h b/src/common/sysctl.h
index f4432ab..32431dd 100644
--- a/src/common/sysctl.h
+++ b/src/common/sysctl.h
@@ -40,6 +40,14 @@
   #define CPUSUBFAMILY_ARM_HC_HD 5
 #endif
 
+// For alternative way to get CPU frequency on macOS and *BSD
+#ifdef __APPLE__
+  #define CPUFREQUENCY_SYSCTL "hw.cpufrequency_max"
+#else
+  // For FreeBSD, not sure about other *BSD
+  #define CPUFREQUENCY_SYSCTL "dev.cpu.0.freq"
+#endif
+
 uint32_t get_sys_info_by_name(char* name);
 
 #endif
diff --git a/src/x86/cpuid.c b/src/x86/cpuid.c
index 8281a0f..54a120d 100644
--- a/src/x86/cpuid.c
+++ b/src/x86/cpuid.c
@@ -5,6 +5,9 @@
   #include "../common/udev.h"
   #include <unistd.h>
 #endif
+#if defined (__FreeBSD__) || defined (__APPLE__)
+  #include "../common/sysctl.h"
+#endif
 
 #ifdef __linux__
   #include "../common/freq.h"
@@ -938,10 +941,20 @@ struct frequency* get_frequency_info(struct cpuInfo* cpu) {
   freq->measured = false;
 
   if(cpu->maxLevels < 0x00000016) {
-    #if defined (_WIN32) || defined (__APPLE__)
+    #if defined (_WIN32)
       printWarn("Can't read frequency information from cpuid (needed level is 0x%.8X, max is 0x%.8X)", 0x00000016, cpu->maxLevels);
       freq->base = UNKNOWN_DATA;
       freq->max = UNKNOWN_DATA;
+    #elif defined (__FreeBSD__) || defined (__APPLE__)
+      printWarn("Can't read frequency information from cpuid (needed level is 0x%.8X, max is 0x%.8X). Using sysctl", 0x00000016, cpu->maxLevels);
+      uint32_t freq_hz = get_sys_info_by_name(CPUFREQUENCY_SYSCTL);
+      if (freq_hz == 0) {
+        printWarn("Read max CPU frequency from sysctl and got 0 MHz");
+        freq->max = UNKNOWN_DATA;
+      }
+
+      freq->base = UNKNOWN_DATA;
+      freq->max = freq_hz;
     #else
       printWarn("Can't read frequency information from cpuid (needed level is 0x%.8X, max is 0x%.8X). Using udev", 0x00000016, cpu->maxLevels);
       freq->base = UNKNOWN_DATA;