Update README.md

README.md

@@ -9,7 +9,54 @@ IGCL is meant to be a collection of high level APIs for all control aspects of h
 * IGCL binaries are distributed as part of Intel Graphics driver package.
 * Header & library wrapper code are provided here to help developers with their application development.
 * For API/spec questions or issues, for now, use the "Issues" tab under Github. For issues related to an already shipped binary of this spec, contact standard Intel customer support for Graphics.
-* Performance & Telemetry API's, i.e., Engine/Fan/Telemetry/Frequency/Memory/Overclock/PCI/Power/Temperature are limited to 64-bit applications as of now. This is a Level0 limitation.
+* Core API's related to Engine/Fan/Frequency/Memory/Overclock/PCI/Power/Temperature are limited to 64-bit applications. This is a Level0 limitation which is limited to 64-bit. For these API's, IGCL uses Level0 library.
+
+  Device Frequency APIs
+  - ctlEnumFrequencyDomains
+  - ctlFrequencyGetProperties
+  - ctlFrequencyGetAvailableClocks
+  - ctlFrequencyGetRange
+  - ctlFrequencySetRange
+  - ctlFrequencyGetState
+  - ctlFrequencyGetThrottleTime
+
+  Temperature APIs
+  - ctlEnumTemperatureSensors
+  - ctlTemperatureGetProperties
+  - ctlTemperatureGetState
+
+  Power APIs
+  - ctlEnumPowerDomains
+  - ctlPowerGetProperties
+  - ctlPowerGetEnergyCounter
+  - ctlPowerGetLimits
+  - ctlPowerSetLimits
+
+  Fan APIs
+  - ctlEnumFans
+  - ctlFanGetProperties
+  - ctlFanGetConfig
+  - ctlFanGetState
+  - ctlFanSetDefaultMode
+  - ctlFanSetFixedSpeedMode
+  - ctlFanSetSpeedTableMode
+
+  PCI APIs
+  - ctlPciGetProperties
+  - ctlPciGetState
+
+  Memory APIs
+  - ctlEnumMemoryModules
+  - ctlMemoryGetProperties
+  - ctlMemoryGetState
+  - ctlMemoryGetBandwidth
+
+  Engine APIs
+  - ctlEnumEngineGroups
+  - ctlEngineGetProperties
+  - ctlEngineGetActivity
+
+  More details on Level0 can be found at https://oneapi-src.github.io/level-zero-spec/level-zero/latest/index.html
 
 # Usage 
 cmake.exe -B <output_folder> -S <cmake_source_folder> -G "Visual Studio 17 2022" -A x64