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= Secure Monitor calls =
= Secure Monitor Calls =
The secure monitor provides two top level handlers of which each provides a range of sub handlers.
The secure monitor provides two top level handlers of which each provides a range of sub handlers.
Secure Monitor calls follow the ARM SMC calling convention up to a small change:
Secure Monitor calls follow the ARM SMC calling convention with a small change:
{| class=wikitable
{| class=wikitable
! Bit number || Bit mask || Description
! Bits || Description
|-
|-
| 31 || 0x80000000 || Set to 0 means Yielding Call; Set to 1 means Fast Call.
| 0-7 || Function Number
|-
|-
| 30 || 0x40000000 || Set to 0 means SMC32 convention; Set to 1 means SMC64.
| 8-15 || Argument Type
|-
|-
| 29-24 || 0x3F000000 || Service Call ranges.
| 16-23 || Reserved
|-
|-
| 23-16 || 0x00FF0000 || Must be zero.
| 24-29 || Call Range
|-
|-
| 15-8 || 0x0000FF00 || Argument type. This is different from the ARM SMC calling convention.
| 30 || Call Convention (0 = SMC32, 1 = SMC64)
|-
|-
| 7-0 || 0x000000FF || Function number within the range call type.
| 31 || Call Type (0 = Yielding Call, 1 = Fast Call)
|}
|}
| 0xC3000404 || GetResultData
| 0xC3000404 || GetResultData
|-
|-
| 0xC3000E05 || ExpMod
| 0xC3000E05 || ModularExponentiate
|-
|-
| 0xC3000006 || [[#GenerateRandomBytes]] (same as in [[#FunctionId1]])
| 0xC3000006 || [[#GenerateRandomBytes]] (same as in [[#FunctionId1]])
| 0xC300040B || [[#ComputeCmac]]
| 0xC300040B || [[#ComputeCmac]]
|-
|-
| [1.0.0-4.1.0] 0xC300100C || [[#ImportEsKey]]
| [1.0.0-4.1.0] 0xC300100C || [[#DecryptAndImportEsDeviceKey]]
|-
|-
| [5.0.0+] 0xC300D60C || [[#ReEncryptRsaPrivateKey]]
| [5.0.0+] 0xC300D60C || [[#ReencryptDeviceUniqueData]]
|-
|-
| [1.0.0-4.1.0] 0xC300100D || [[#DecryptRsaPrivateKey]]
| 0xC300100D || [[#DecryptDeviceUniqueData]]
|-
|-
| [5.0.0+] 0xC300100D || [[#DecryptOrImportRsaPrivateKey]]
| [1.0.0-4.1.0] 0xC300100E || [[#DecryptAndImportLotusKey]]
|-
|-
| [1.0.0-4.1.0] 0xC300100E || [[#ImportSecureExpModKey]]
| 0xC300060F || [[#ModularExponentiateByStorageKey]]
|-
|-
| 0xC300060F || [[#SecureExpMod]]
| 0xC3000610 || [[#PrepareEsDeviceUniqueKey]]
|-
|-
| 0xC3000610 || [[#UnwrapTitleKey]]
| 0xC3000011 || [[#LoadPreparedAesKey]]
|-
|-
| 0xC3000012 || [2.0.0+] [[#PrepareEsCommonKey]]
| 0xC3000012 || [2.0.0+] [[#UnwrapCommonTitleKey]]
|}
|}
Calculates CMAC over input data.
Calculates CMAC over input data.
=== ImportEsKey ===
=== DecryptAndImportEsDeviceKey ===
Takes a session kek created with [[#GenerateAesKek]], a wrapped AES key, and a wrapped RSA private key.
Takes a session kek created with [[#GenerateAesKek]], a wrapped AES key, and a wrapped RSA private key.
The session kek must have been created with [[#CryptoUsecase|CryptoUsecase TitleKey]].
The session kek must have been created with [[#CryptoUsecase|CryptoUsecase TitleKey]].
[5.0.0] This function was removed and replaced with [[#ReEncryptRsaPrivateKey]].
[5.0.0] This function was removed and replaced with [[#ReencryptDeviceUniqueData]].
=== ReEncryptRsaPrivateKey ===
=== ReencryptDeviceUniqueData ===
Takes in two session keks created with [[#GenerateAesKek]], two wrapped AES keys, an enum member, and a wrapped RSA private key.
Takes in two session keks created with [[#GenerateAesKek]], two wrapped AES keys, an enum member, and a wrapped RSA private key.
Decrypts and validates the wrapped RSA private key with the first kek/wrapped key, and re-encrypts it with the second if valid.
Decrypts and validates the wrapped RSA private key with the first kek/wrapped key, and re-encrypts it with the second if valid.
The re-encrypted key is then passed to the user, for use with [[#DecryptOrImportRsaPrivateKey]].
The re-encrypted key is then passed to the user, for use with [[#DecryptDeviceUniqueData]].
=== DecryptRsaPrivateKey ===
=== DecryptDeviceUniqueData ===
Takes a session kek created with [[#GenerateAesKek]], a wrapped AES key, an enum member, and a wrapped RSA private key.
Takes a session kek created with [[#GenerateAesKek]], a wrapped AES key, an enum member, and a wrapped RSA private key.
[4.0.0+] The SMC handler when certain conditions pass and FunctionId0==0xC300100D now returns error 0x6 instead of calling the handler funcptr.
[4.0.0+] The SMC handler when certain conditions pass and FunctionId0==0xC300100D now returns error 0x6 instead of calling the handler funcptr.
[5.0.0+] This function was replaced by [[#DecryptOrImportRsaPrivateKey]].
[5.0.0+] This function now takes an additional input [[#DecryptOrImportMode]]. This extends the original functionality to enable importing private keys into the security engine instead of decrypting them.
This SMC extends DecryptRsaPrivateKey's original functionality to enable importing private keys into the security engine instead of decrypting them, when certain enum members are passed.
=== ImportSecureExpModKey ===
=== DecryptAndImportLotusKey ===
Takes a session kek created with [[#GenerateAesKek]], and a wrapped RSA key.
Takes a session kek created with [[#GenerateAesKek]], and a wrapped RSA key.
[5.0.0] This function was removed.
[5.0.0] This function was removed.
=== SecureExpMod ===
=== ModularExponentiateByStorageKey ===
Performs an ExpMod operation using an exponent previously loaded with the [[#ImportSecureExpModKey]] command.
Performs an ExpMod operation using an exponent previously loaded with the [[#DecryptAndImportLotusKey]] command.
[5.0.0+] This now uses any exponent previously loaded with [[#DecryptOrImportRsaPrivateKey]] and takes an [[#SecureExpModMode]].
[5.0.0+] This now uses any exponent previously loaded with [[#DecryptDeviceUniqueData]] and takes an [[#SecureExpModMode]].
=== UnwrapTitleKey ===
=== PrepareEsDeviceUniqueKey ===
Takes an Rsa-Oaep-wrapped TitleKey, an RSA Public Key, and a label hash.
Takes an Rsa-Oaep-wrapped TitleKey, an RSA Public Key, and a label hash.
Performs an ExpMod operation using an exponent previously loaded with the [[#ImportEsKey]] command, and then validates/extracts a Titlekey from the resulting message.
Performs an ExpMod operation using an exponent previously loaded with the [[#DecryptAndImportEsDeviceKey]] command, and then validates/extracts a Titlekey from the resulting message.
Returns a session-unique AES key especially for use in [[#LoadTitleKey]].
Returns a session-unique AES key especially for use in [[#LoadTitleKey]].
[5.0.0+] This now uses any exponent previously loaded with [[#DecryptOrImportRsaPrivateKey]].
[5.0.0+] This now uses any exponent previously loaded with [[#DecryptDeviceUniqueData]].
=== LoadTitleKey ===
=== LoadPreparedAesKey ===
Takes a session-unique AES key from [[#UnwrapCommonTitleKey]] or [[#UnwrapTitleKey]].
Takes a session-unique AES key from [[#PrepareEsCommonKey]] or [[#PrepareEsDeviceUniqueKey]].
=== UnwrapCommonTitleKey ===
=== PrepareEsCommonKey ===
Takes an AES-wrapped TitleKey and returns a sealed AES key.
Takes an AES-wrapped common TitleKey and returns a sealed AES key.
== FunctionId1 ==
== FunctionId1 ==
! Value || Name
! Value || Name
|-
|-
| 0xC4000001 || [[#CpuSuspend]]
| 0xC4000001 || [[#SuspendCpu]]
|-
|-
| 0x84000002 || [[#CpuOff]]
| 0x84000002 || [[#PowerOffCpu]]
|-
|-
| 0xC4000003 || [[#CpuOn]]
| 0xC4000003 || [[#PowerOnCpu]]
|-
|-
| 0xC3000004 || [[#GetConfig]] (same as in [[#FunctionId0]])
| 0xC3000004 || [[#GetConfig]] (same as in [[#FunctionId0]])
| 0xC3000005 || [[#GenerateRandomBytes]] (same as in [[#FunctionId0]])
| 0xC3000005 || [[#GenerateRandomBytes]] (same as in [[#FunctionId0]])
|-
|-
| 0xC3000006 || [[#Panic]]
| 0xC3000006 || [[#ShowError]]
|-
|-
| 0xC3000007 || [2.0.0+] [[#ConfigureCarveout]]
| 0xC3000007 || [2.0.0+] [[#SetKernelCarveoutRegion]]
|-
|-
| 0xC3000008 || [2.0.0+] [[#ReadWriteRegister]]
| 0xC3000008 || [2.0.0+] [[#ReadWriteRegister]]
|}
|}
=== CpuSuspend ===
=== SuspendCpu ===
Takes an u64 '''PowerState''', an u64 '''EntrypointAddress''' and an u64 '''ContextId'''. No output.
Takes an u64 '''PowerState''', an u64 '''EntrypointAddress''' and an u64 '''ContextId'''. No output.
The kernel calls this SMC on shutdown with '''PowerState''' set to 0x0201001B (power level: 0x02==system; power type: 0x01==powerdown; ID: 0x1B).
The kernel calls this SMC on shutdown with '''PowerState''' set to 0x0201001B (power level: 0x02==system; power type: 0x01==powerdown; ID: 0x1B).
=== CpuOff ===
=== PowerOffCpu ===
No input/output.
No input/output.
Turns off the CPU (CPU1, CPU2 or CPU3).
Turns off the CPU (CPU1, CPU2 or CPU3).
=== CpuOn ===
=== PowerOnCpu ===
Takes an u64 '''TargetCpu''', an u64 '''EntrypointAddress''' and an u64 '''ContextId'''. Returns [[#Result]].
Takes an u64 '''TargetCpu''', an u64 '''EntrypointAddress''' and an u64 '''ContextId'''. Returns [[#Result]].
The kernel limits '''Size''' to 0x38 (for fitting in return registers).
The kernel limits '''Size''' to 0x38 (for fitting in return registers).
=== Panic ===
=== ShowError ===
Takes an u32 '''Color''' and issues a system panic.
Takes an u32 '''Color''' and issues a system panic.
The kernel always calls this with '''Color''' set to 0xF00.
The kernel always calls this with '''Color''' set to 0xF00.
=== ConfigureCarveout ===
=== SetKernelCarveoutRegion ===
Takes an u64 '''Index''', an u64 '''Address''' and an u64 '''Size'''. Returns [[#Result]].
Takes an u64 '''Index''', an u64 '''Address''' and an u64 '''Size'''. Returns [[#Result]].