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Diffstat (limited to 'src/osx/smc.hpp')
| -rw-r--r-- | src/osx/smc.hpp | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/osx/smc.hpp b/src/osx/smc.hpp new file mode 100644 index 0000000..13070f2 --- /dev/null +++ b/src/osx/smc.hpp @@ -0,0 +1,199 @@ +#pragma once + +#include <CoreFoundation/CoreFoundation.h> +#include <IOKit/IOKitLib.h> +#include <IOKit/ps/IOPSKeys.h> +#include <IOKit/ps/IOPowerSources.h> +#include <stdexcept> + +#define VERSION "0.01" + +#define KERNEL_INDEX_SMC 2 + +#define SMC_CMD_READ_BYTES 5 +#define SMC_CMD_WRITE_BYTES 6 +#define SMC_CMD_READ_INDEX 8 +#define SMC_CMD_READ_KEYINFO 9 +#define SMC_CMD_READ_PLIMIT 11 +#define SMC_CMD_READ_VERS 12 + +#define DATATYPE_FPE2 "fpe2" +#define DATATYPE_UINT8 "ui8 " +#define DATATYPE_UINT16 "ui16" +#define DATATYPE_UINT32 "ui32" +#define DATATYPE_SP78 "sp78" + +// key values +#define SMC_KEY_CPU_TEMP "TC0P" +#define SMC_KEY_CPU1_TEMP "TC1C" +#define SMC_KEY_CPU2_TEMP "TC2C" // etc +#define SMC_KEY_FAN0_RPM_CUR "F0Ac" + +typedef struct { + char major; + char minor; + char build; + char reserved[1]; + UInt16 release; +} SMCKeyData_vers_t; + +typedef struct { + UInt16 version; + UInt16 length; + UInt32 cpuPLimit; + UInt32 gpuPLimit; + UInt32 memPLimit; +} SMCKeyData_pLimitData_t; + +typedef struct { + UInt32 dataSize; + UInt32 dataType; + char dataAttributes; +} SMCKeyData_keyInfo_t; + +typedef char SMCBytes_t[32]; + +typedef struct { + UInt32 key; + SMCKeyData_vers_t vers; + SMCKeyData_pLimitData_t pLimitData; + SMCKeyData_keyInfo_t keyInfo; + char result; + char status; + char data8; + UInt32 data32; + SMCBytes_t bytes; +} SMCKeyData_t; + +typedef char UInt32Char_t[5]; + +typedef struct { + UInt32Char_t key; + UInt32 dataSize; + UInt32Char_t dataType; + SMCBytes_t bytes; +} SMCVal_t; + +namespace Cpu { + class SMCConnection { + io_connect_t conn; + kern_return_t result; + mach_port_t masterPort; + io_iterator_t iterator; + io_object_t device; + + public: + SMCConnection() { + IOMasterPort(MACH_PORT_NULL, &masterPort); + + CFMutableDictionaryRef matchingDictionary = IOServiceMatching("AppleSMC"); + result = IOServiceGetMatchingServices(masterPort, matchingDictionary, &iterator); + if (result != kIOReturnSuccess) { + throw std::runtime_error("failed to get AppleSMC"); + } + + device = IOIteratorNext(iterator); + IOObjectRelease(iterator); + if (device == 0) { + throw std::runtime_error("failed to get SMC device"); + } + + result = IOServiceOpen(device, mach_task_self(), 0, &conn); + IOObjectRelease(device); + if (result != kIOReturnSuccess) { + throw std::runtime_error("failed to get SMC connection"); + } + } + // core means physical core in SMC, while in core map it's cpu threads :-/ Only an issue on hackintosh? + // this means we can only get the T per physical core + // another issue with the SMC API is that the key is always 4 chars -> what with systems with more than 9 physical cores? + // no Mac models with more than 18 threads are released, so no problem so far + // according to VirtualSMC docs (hackintosh fake SMC) the enumeration follows with alphabetic chars - not implemented yet here (nor in VirtualSMC) + long long getTemp(int core) { + SMCVal_t val; + kern_return_t result; + char key[] = SMC_KEY_CPU_TEMP; + if (core >= 0) { + snprintf(key, 5, "TC%1dc", core); + } + result = SMCReadKey(key, &val); + if (result == kIOReturnSuccess) { + if (strcmp(val.dataType, DATATYPE_SP78) == 0) { + // convert sp78 value to temperature + int intValue = val.bytes[0] * 256 + (unsigned char)val.bytes[1]; + return static_cast<long long>(intValue / 256.0); + } + } + return -1; + } + virtual ~SMCConnection() { + IOServiceClose(conn); + } + private: + UInt32 _strtoul(char *str, int size, int base) { + UInt32 total = 0; + int i; + + for (i = 0; i < size; i++) { + if (base == 16) { + total += str[i] << (size - 1 - i) * 8; + } else { + total += (unsigned char)(str[i] << (size - 1 - i) * 8); + } + } + return total; + } + void _ultostr(char *str, UInt32 val) { + str[0] = '\0'; + sprintf(str, "%c%c%c%c", + (unsigned int)val >> 24, + (unsigned int)val >> 16, + (unsigned int)val >> 8, + (unsigned int)val); + } + + kern_return_t SMCCall(int index, SMCKeyData_t *inputStructure, SMCKeyData_t *outputStructure) { + size_t structureInputSize; + size_t structureOutputSize; + + structureInputSize = sizeof(SMCKeyData_t); + structureOutputSize = sizeof(SMCKeyData_t); + + return IOConnectCallStructMethod(conn, index, + // inputStructure + inputStructure, structureInputSize, + // ouputStructure + outputStructure, &structureOutputSize); + } + + kern_return_t SMCReadKey(UInt32Char_t key, SMCVal_t *val) { + kern_return_t result; + SMCKeyData_t inputStructure; + SMCKeyData_t outputStructure; + + memset(&inputStructure, 0, sizeof(SMCKeyData_t)); + memset(&outputStructure, 0, sizeof(SMCKeyData_t)); + memset(val, 0, sizeof(SMCVal_t)); + + inputStructure.key = _strtoul(key, 4, 16); + inputStructure.data8 = SMC_CMD_READ_KEYINFO; + + result = SMCCall(KERNEL_INDEX_SMC, &inputStructure, &outputStructure); + if (result != kIOReturnSuccess) + return result; + + val->dataSize = outputStructure.keyInfo.dataSize; + _ultostr(val->dataType, outputStructure.keyInfo.dataType); + inputStructure.keyInfo.dataSize = val->dataSize; + inputStructure.data8 = SMC_CMD_READ_BYTES; + + result = SMCCall(KERNEL_INDEX_SMC, &inputStructure, &outputStructure); + if (result != kIOReturnSuccess) + return result; + + memcpy(val->bytes, outputStructure.bytes, sizeof(outputStructure.bytes)); + + return kIOReturnSuccess; + } + }; +} |