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1,098 bytes added ,  20:10, 7 December 2017
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If bit ''n'' is set in the argument type then parameter X''n'' is treated as a pointer and the kernel will setup address translation for it in [[SVC#svcCallSecureMonitor|svcCallSecureMonitor]].
 
If bit ''n'' is set in the argument type then parameter X''n'' is treated as a pointer and the kernel will setup address translation for it in [[SVC#svcCallSecureMonitor|svcCallSecureMonitor]].
   −
== Id 0 ==
+
SMC arguments are passed using registers X0-X7 with X0 always sending the call sub-id and returning the result of the call.
 +
 
 +
== ID 0 ==
 
Functions exposed to user-mode processes using [[SVC|svcCallSecureMonitor]].
 
Functions exposed to user-mode processes using [[SVC|svcCallSecureMonitor]].
    
{| class=wikitable
 
{| class=wikitable
! Sub-Id || Name || In || Out
+
! Sub-ID || Name || In || Out
 
|-
 
|-
 
| 0xC3000401 || SetConfig || ||
 
| 0xC3000401 || SetConfig || ||
 
|-
 
|-
| 0xC3000002 || GetConfig (Same as Id 1 Sub-Id 4.) || ||
+
| 0xC3000002 || GetConfig (Same as ID 1, Sub-ID 4) || ||
 
|-
 
|-
 
| 0xC3000003 || CheckStatus || ||
 
| 0xC3000003 || CheckStatus || ||
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| 0xC3000E05 || ExpMod || ||
 
| 0xC3000E05 || ExpMod || ||
 
|-
 
|-
| 0xC3000006 || GetRandomBytes (Same as Id 1 Sub-Id 5.) || ||
+
| 0xC3000006 || GetRandomBytes (Same as ID 1, Sub-ID 5) || ||
 
|-
 
|-
 
| 0xC3000007 || [[#GenerateAesKek]] || ||
 
| 0xC3000007 || [[#GenerateAesKek]] || ||
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| 0xC300060F || [[#PublicRsa]] || ||
 
| 0xC300060F || [[#PublicRsa]] || ||
 
|-
 
|-
| 0xC3000610 || [[#UnwrapRsaEncryptedAesKey]] || ||
+
| 0xC3000610 || [[#UnwrapPreparedAesKey]] || ||
 
|-
 
|-
| 0xC3000011 || [[#LoadRsaWrappedAesKey]] || ||
+
| 0xC3000011 || [[#LoadPreparedAesKey]] || ||
 
|-
 
|-
| 0xC3000012 || [2.0.0+] GenerateRsaWrappedAesKek || ||
+
| 0xC3000012 || [2.0.0+] GeneratePreparedAesKek || ||
 
|}
 
|}
   Line 74: Line 76:  
** This means: Plaintext kek keys never leave TrustZone.
 
** This means: Plaintext kek keys never leave TrustZone.
 
** Further, this means: Actual AES/RSA keys never leave TrustZone.
 
** Further, this means: Actual AES/RSA keys never leave TrustZone.
 +
 +
Note:
 +
The [[#CryptoUsecase|CryptoUsecase_PreparedAesKey]] represents a RSA wrapped AES key.
    
=== GenerateAesKek ===
 
=== GenerateAesKek ===
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Key must be set prior using the [[#LoadRsaPublicKey]] command.
 
Key must be set prior using the [[#LoadRsaPublicKey]] command.
   −
=== UnwrapRsaEncryptedAesKey ===
+
=== UnwrapPreparedAesKey ===
 
Takes a session kek created with [[#GenerateAesKek]], and a wrapped RSA public key.
 
Takes a session kek created with [[#GenerateAesKek]], and a wrapped RSA public key.
   −
Returns a session-unique AES key especially for use in [[#LoadRsaWrappedAesKey]].
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Returns a session-unique AES key especially for use in [[#LoadPreparedAesKey]].
   −
The session kek must have been created with CryptoUsecase_RsaWrappedAesKey.
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The session kek must have been created with CryptoUsecase_PreparedAesKey.
   −
=== LoadRsaWrappedAesKey ===
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=== LoadPreparedAesKey ===
Takes a session-unique AES key from [[#UnwrapRsaEncryptedAesKey]].
+
Takes a session-unique AES key from [[#UnwrapPreparedAesKey]].
    
=== enum CryptoUsecase ===
 
=== enum CryptoUsecase ===
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| 2 || CryptoUsecase_PublicRsa
 
| 2 || CryptoUsecase_PublicRsa
 
|-
 
|-
| 3 || CryptoUsecase_RsaWrappedAesKey
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| 3 || CryptoUsecase_PreparedAesKey
 
|}
 
|}
   −
== Id 1 ==
+
== ID 1 ==
 
Functions exposed to the kernel internally.
 
Functions exposed to the kernel internally.
    
{| class=wikitable
 
{| class=wikitable
! Sub-Id || Name || In || Out
+
! Sub-ID || Name || In || Out
 
|-
 
|-
| 0xC4000001 || CpuSuspend || X1=power_state, X2=entrypoint_addr, X3=context_addr || None
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| 0xC4000001 || [[#CpuSuspend]] || X1=power_state, X2=entrypoint_addr, X3=context_id || None
 
|-
 
|-
| 0x84000002 || CpuOff || None || None
+
| 0x84000002 || [[#CpuOff]] || None || None
 
|-
 
|-
| 0xC4000003 || CpuOn || ||
+
| 0xC4000003 || [[#CpuOn]] || X1=target_cpu, X2=entrypoint_addr, X3=context_id, X4,X5,X6,X7=0 || X0=result
 
|-
 
|-
| 0xC3000004 || GetConfig (Same as Id 0 Sub-Id 2.) || W1=config_item, X2,X3,X4,X5,X6,X7=0 || X0=result, X1,X2,X3,X4=config_val
+
| 0xC3000004 || [[#GetConfig]] (Same as ID 0, Sub-ID 2) || W1=config_item, X2,X3,X4,X5,X6,X7=0 || X0=result, X1,X2,X3,X4=config_val
 
|-
 
|-
| 0xC3000005 || GetRandomBytes (Same as Id 0 Sub-Id 6.) || X1=dst_addr, X2,X3,X4,X5,X6,X7=0 ||
+
| 0xC3000005 || [[#GetRandomBytes]] (Same as ID 0, Sub-ID 6) || X1=size, X2,X3,X4,X5,X6,X7=0 || X0=result, X1,X2,X3,X4,X5,X6,X7=rand_bytes
 
|-
 
|-
| 0xC3000006 || Panic || W1=unk, X2,X3,X4,X5,X6,X7=0 || X0=result
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| 0xC3000006 || [[#Panic]] || W1=unk, X2,X3,X4,X5,X6,X7=0 || X0=result
 
|-
 
|-
 
| 0xC3000007 || [2.0.0+] ProtectKernelRegion || ||
 
| 0xC3000007 || [2.0.0+] ProtectKernelRegion || ||
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| 0xC3000008 || [2.0.0+] ReadWriteRegister || ||
 
| 0xC3000008 || [2.0.0+] ReadWriteRegister || ||
 
|}
 
|}
 +
 +
=== CpuSuspend ===
 +
Standard ARM PCSI SMC. Suspends the CPU (CPU0).
 +
 +
The kernel calls this SMC on shutdown with '''power_state''' set to 0x0201001B (power level: 0x02==system; power type: 0x01==powerdown; ID: 0x1B).
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 +
=== CpuOff ===
 +
Standard ARM PCSI SMC. Turns off the CPU (CPU1, CPU2 or CPU3).
 +
 +
=== CpuOn ===
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Standard ARM PCSI SMC. Turns on the CPU (CPU1, CPU2 or CPU3).
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 +
=== GetConfig ===
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Takes a '''config_item''' and returns an associated '''config_val'''.
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 +
=== GetRandomBytes ===
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Takes a '''size''' and returns '''rand_bytes'''.
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The kernel limits '''size''' to 0x38 (for fitting in return registers).
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=== Panic ===
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Issues a system panic.
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The kernel always calls this with '''unk''' set to 0xF00.
    
= Errors =
 
= Errors =
2: Invalid input
+
{| class=wikitable
3: Busy
+
! Value || Description
 +
|-
 +
| 2 || Invalid input
 +
|-
 +
| 3 || Busy
 +
|}

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