Difference between revisions of "Secure Monitor"

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[3.0.0+] [[Loader services|RO]] checks this and if set then skipping NRR rsa signatures is allowed.
 
[3.0.0+] [[Loader services|RO]] checks this and if set then skipping NRR rsa signatures is allowed.
  
−
The value of this field is loaded from [[BootConfig]] unsigned-config+0x10 u8 bit1.
+
===== KernelConfiguration =====
 +
{| class="wikitable" border="1"
 +
|-
 +
! Bits
 +
! Description
 +
|-
 +
| 0
 +
| EnableNonZeroFillMemory
 +
|-
 +
| 1
 +
| EnableUserExceptionHandler
 +
|-
 +
| 2
 +
| PerformanceMonitoringUnit
 +
|-
 +
| 3
 +
| EnableApplicationExtraThread
 +
|-
 +
| 8
 +
| CallShowErrorOnPanic
 +
|-
 +
| 16-17
 +
| MemorySize
 +
|}
  
−
===== KernelConfiguration =====
+
Kernel reads this when setting up memory-related code.
−
Kernel reads this when setting up memory-related code.  
 
  
−
Bit 0 is a boolean determining whether kernel should it will memset various allocated memory-regions with 0x58, 0x59, 0x5A ('X', 'Y', 'Z') instead of zero. This allows Nintendo devs to find uninitialized memory bugs.
+
'''EnableNonZeroFillMemory''' is a boolean determining whether kernel should it will memset various allocated memory-regions with 0x58, 0x59, 0x5A ('X', 'Y', 'Z') instead of zero. This allows Nintendo devs to find uninitialized memory bugs.
  
−
Bit 1 is a boolean determining whether kernel should forcefully enable usermode exception handlers (when false, only certain aborts (((1LL << (esr >> 26)) & 0x1115804400224001) == 0, typically data/prefetch aborts) that occur when the faulting address is in a readable region with MemoryType_CodeStatic will trigger usermode exception handlers).
+
'''EnableUserExceptionHandler''' is a boolean determining whether kernel should forcefully enable usermode exception handlers (when false, only certain aborts (((1LL << (esr >> 26)) & 0x1115804400224001) == 0, typically data/prefetch aborts) that occur when the faulting address is in a readable region with MemoryType_CodeStatic will trigger usermode exception handlers).
  
−
Bit 2 is a boolean determining whether kernel should enable usermode access to the Performance Monitors (whether PMUSERENR_EL0 should be 1 or 0).
+
'''PerformanceMonitoringUnit''' is a boolean determining whether kernel should enable usermode access to the Performance Monitors (whether PMUSERENR_EL0 should be 1 or 0).
  
−
[8.0.0+] Bit 3 is a boolean determining whether the kernel should increase the KThread slabheap capacity by 160. This also increases object capacities that are calculated based on number of threads.
+
[8.0.0+] '''EnableApplicationExtraThread''' is a boolean determining whether the kernel should increase the KThread slabheap capacity by 160. This also increases object capacities that are calculated based on number of threads.
  
−
Bits 8-15 are a boolean determining whether kernel should call smcPanic on error instead of infinite-looping.
+
'''CallShowErrorOnPanic''' is a boolean determining whether kernel should call smcPanic on error instead of infinite-looping.
  
−
Bits 16-17 determine how much memory is available. 00/03 = 4 GB, 01 = 6 GB, 02 = 8 GB.
+
'''MemorySize''' determines how much memory is available. 00/03 = 4 GB, 01 = 6 GB, 02 = 8 GB.
  
 
===== IsChargerHiZModeEnabled =====
 
===== IsChargerHiZModeEnabled =====

Revision as of 19:34, 16 February 2020

Secure Monitor calls

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:

Bit number Bit mask Description
31 0x80000000 Set to 0 means Yielding Call; Set to 1 means Fast Call.
30 0x40000000 Set to 0 means SMC32 convention; Set to 1 means SMC64.
29-24 0x3F000000 Service Call ranges.
23-16 0x00FF0000 Must be zero.
15-8 0x0000FF00 Argument type. This is different from the ARM SMC calling convention.
7-0 0x000000FF Function number within the range call type.

If bit n is set in the argument type then parameter Xn is treated as a pointer and the kernel will setup address translation for it in svcCallSecureMonitor.

SMC arguments are passed using registers X0-X7 with X0 always sending the call sub-id and returning the result of the call.

FunctionId0

Functions exposed to user-mode processes using svcCallSecureMonitor. SMCs should be called from CPUID 3 (where SPL runs).

Value Name
0xC3000401 SetConfig
0xC3000002 #GetConfig (same as in #FunctionId1)
0xC3000003 GetResult
0xC3000404 GetResultData
0xC3000E05 ExpMod
0xC3000006 #GenerateRandomBytes (same as in #FunctionId1)
0xC3000007 #GenerateAesKek
0xC3000008 #LoadAesKey
0xC3000009 #ComputeAes
0xC300000A #GenerateSpecificAesKey
0xC300040B #ComputeCmac
[1.0.0-4.1.0] 0xC300100C #ImportEsKey
[5.0.0+] 0xC300D60C #ReEncryptRsaPrivateKey
[1.0.0-4.1.0] 0xC300100D #DecryptRsaPrivateKey
[5.0.0+] 0xC300100D #DecryptOrImportRsaPrivateKey
[1.0.0-4.1.0] 0xC300100E #ImportLotusKey
0xC300060F #StorageExpMod
0xC3000610 #UnwrapTitleKey
0xC3000011 #LoadTitleKey
0xC3000012 [2.0.0+] #UnwrapCommonTitleKey

The overall concept here is the following:

  • All key material (AES and RSA) is stored in userspace, but it's encrypted with random AES kek's ("key encryption keys").
  • Each kek is generated as a function of an access key (picked at random).
  • The kek is generated differently depending on the #CryptoUsecase the key is used for.
    • This means: Each key is "locked" to the #CryptoUsecase it was designated for.
    • You can use a key for a different usecase, but you will only get garbage output.
  • After the kek has been generated, it is wrapped with a session-specific key and given back to userspace.
    • This means: Plaintext kek keys never leave TrustZone.
    • Further, this means: Actual AES/RSA keys never leave TrustZone.

GenerateAesKek

Takes an "access key" as input, an #CryptoUsecase.

Returns a session-unique kek for said usecase.

LoadAesKey

Takes a session kek created with #GenerateAesKek, and a wrapped AES key.

The session kek must have been created with CryptoUsecase Aes.

ComputeAes

Encrypts/decrypts using AES (CTR and CBC). Takes an #CipherMode.

Key must be set prior using one of the #LoadAesKey or #GenerateSpecificAesKey commands.

GenerateSpecificAesKey

Takes a wrapped AES key and decrypts it using static data.

ComputeCmac

Calculates CMAC over input data.

ImportEsKey

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 TitleKey.

[5.0.0] This function was removed and replaced with #ReEncryptRsaPrivateKey.

ReEncryptRsaPrivateKey

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.

The re-encrypted key is then passed to the user, for use with #DecryptOrImportRsaPrivateKey.

DecryptRsaPrivateKey

Takes a session kek created with #GenerateAesKek, a wrapped AES key, an enum member, and a wrapped RSA private key.

The session kek must have been created with CryptoUsecase RsaPrivate.

[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.

DecryptOrImportRsaPrivateKey

This function replaced #DecryptRsaPrivateKey in 5.0.0, adding an additional #DecryptOrImportMode.

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.

ImportLotusKey

Takes a session kek created with #GenerateAesKek, and a wrapped RSA key.

The session kek must have been created with CryptoUsecase RsaSecureExpMod.

[5.0.0] This function was removed.

SecureExpMod

Performs an ExpMod operation using an exponent previously loaded with the #ImportLotusKey command.

[5.0.0+] This now uses any exponent previously loaded with #DecryptOrImportRsaPrivateKey and takes an #SecureExpModMode.

UnwrapTitleKey

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.

Returns a session-unique AES key especially for use in #LoadTitleKey.

[5.0.0+] This now uses any exponent previously loaded with #DecryptOrImportRsaPrivateKey.

LoadTitleKey

Takes a session-unique AES key from #UnwrapCommonTitleKey or #UnwrapTitleKey.

UnwrapCommonTitleKey

Takes an AES-wrapped TitleKey and returns a sealed AES key.

FunctionId1

Functions exposed to the kernel internally.

Value Name
0xC4000001 #CpuSuspend
0x84000002 #CpuOff
0xC4000003 #CpuOn
0xC3000004 #GetConfig (same as in #FunctionId0)
0xC3000005 #GenerateRandomBytes (same as in #FunctionId0)
0xC3000006 #Panic
0xC3000007 [2.0.0+] #ConfigureCarveout
0xC3000008 [2.0.0+] #ReadWriteRegister

CpuSuspend

Takes an u64 PowerState, an u64 EntrypointAddr and an u64 ContextId. No output.

Suspends the CPU (CPU0).

The kernel calls this SMC on shutdown with PowerState set to 0x0201001B (power level: 0x02==system; power type: 0x01==powerdown; ID: 0x1B).

CpuOff

No input/output.

Turns off the CPU (CPU1, CPU2 or CPU3).

CpuOn

Takes an u64 TargetCpu, an u64 EntrypointAddr and an u64 ContextId. Returns #Result.

Turns on the CPU (CPU1, CPU2 or CPU3).

GetConfig

Takes a #ConfigItem. Returns #Result and a ConfigVal.

ConfigItem

Value Name
1 #DisableProgramVerification
2 #DramId
3 #SecurityEngineInterruptNumber
4 #FuseVersion
5 #HardwareType
6 #IsRetail
7 #IsRecoveryBoot
8 #DeviceId
9 [1.0.0-4.0.0] #BootReason
10 #MemoryMode
11 #IsDebugMode
12 #KernelConfiguration
13 #IsChargerHiZModeEnabled
14 [4.0.0+] #IsQuest
15 [5.0.0+] #RegulatorType
16 [5.0.0+] #DeviceUniqueKeyGeneration
17 [5.0.0+] #Package2Hash
DisableProgramVerification

PM checks this item and if non-zero, calls fsp-pr SetEnabledProgramVerification(false).

DramId
Value Description
0 EristaIcosaSamsung4gb
1 EristaIcosaHynix4gb
2 EristaIcosaMicron4gb
3 Reserved
4 EristaIcosaSamsung6gb
5 [4.0.0+] Reserved
6 [4.0.0+] Reserved
7 [5.0.0+] MarikoIowax1x2Samsung4gb ([4.0.0-4.1.0] Reserved)
8 [5.0.0+] MarikoIowaSamsung4gb
9 [5.0.0+] MarikoIowaSamsung8gb
10 [6.0.0+] MarikoIowaHynix4gb ([5.0.0-5.1.0] Reserved)
11 [7.0.0+] MarikoIowaMicron4gb ([5.0.0-6.2.0] Reserved)
12 [5.0.0+] MarikoHoagSamsung4gb
13 [5.0.0+] MarikoHoagSamsung8gb
14 [7.0.0+] MarikoHoagHynix4gb ([5.0.0-6.2.0] Reserved)
15 [7.0.0+] MarikoHoagMicron4gb ([5.0.0-6.2.0] Reserved)
16 [8.0.0+] MarikoIowaSamsung4gbY
17 [9.0.0+] MarikoIowaSamsung1y4gbX
18 [9.0.0+] MarikoIowaSamsung1y8gbX
19 [9.0.0+] MarikoHoagSamsung1y4gbX
20 [9.0.0+] MarikoIowaSamsung1y4gbY
21 [9.0.0+] MarikoIowaSamsung1y8gbY
22 [9.0.0+] MarikoIowaSamsung1y4gbA

This is extracted directly from FUSE_RESERVED_ODM4.

PCV selects memory training tables based on DramId.

SoC Platform DramId Revision DVFS version
T210 jetson-tx1 N/A 0x07 
11_40800_01_V9.8.3_V1.6
11_68000_01_V9.8.3_V1.6
11_102000_01_V9.8.3_V1.6
11_204000_05_V9.8.3_V1.6
11_408000_02_V9.8.3_V1.6
11_665600_03_V9.8.3_V1.6
11_800000_01_V9.8.3_V1.6
11_1065600_01_V9.8.3_V1.6
11_1331200_01_V9.8.3_V1.6
11_1600000_02_V9.8.3_V1.6
T210 nx-abcb EristaIcosaSamsung4gb 0x07 
10_40800_NoCfgVersion_V9.8.7_V1.6
10_68000_NoCfgVersion_V9.8.7_V1.6
10_102000_NoCfgVersion_V9.8.7_V1.6
10_204000_NoCfgVersion_V9.8.7_V1.6
10_408000_NoCfgVersion_V9.8.7_V1.6
10_665600_NoCfgVersion_V9.8.7_V1.6
10_800000_NoCfgVersion_V9.8.7_V1.6
10_1065600_NoCfgVersion_V9.8.7_V1.6
10_1331200_NoCfgVersion_V9.8.7_V1.6
10_1600000_NoCfgVersion_V9.8.7_V1.6
T210 nx-abcb EristaIcosaMicron4gb 0x07 
10_40800_NoCfgVersion_V9.8.4_V1.6
10_68000_NoCfgVersion_V9.8.4_V1.6
10_102000_NoCfgVersion_V9.8.4_V1.6
10_204000_NoCfgVersion_V9.8.4_V1.6
10_408000_NoCfgVersion_V9.8.4_V1.6
10_665600_NoCfgVersion_V9.8.4_V1.6
10_800000_NoCfgVersion_V9.8.4_V1.6
10_1065600_NoCfgVersion_V9.8.4_V1.6
10_1331200_NoCfgVersion_V9.8.4_V1.6
10_1600000_NoCfgVersion_V9.8.4_V1.6
T210 nx-abcb EristaIcosaHynix4gb 0x07 
10_40800_NoCfgVersion_V9.8.4_V1.6
10_68000_NoCfgVersion_V9.8.4_V1.6
10_102000_NoCfgVersion_V9.8.4_V1.6
10_204000_NoCfgVersion_V9.8.4_V1.6
10_408000_NoCfgVersion_V9.8.4_V1.6
10_665600_NoCfgVersion_V9.8.4_V1.6
10_800000_NoCfgVersion_V9.8.4_V1.6
10_1065600_NoCfgVersion_V9.8.4_V1.6
10_1331200_NoCfgVersion_V9.8.4_V1.6
10_1600000_NoCfgVersion_V9.8.4_V1.6
T210 nx-abca2 EristaIcosaSamsung4gb, EristaIcosaMicron4gb 0x07 
10_40800_NoCfgVersion_V9.8.7_V1.6
10_68000_NoCfgVersion_V9.8.7_V1.6
10_102000_NoCfgVersion_V9.8.7_V1.6
10_204000_NoCfgVersion_V9.8.7_V1.6
10_408000_NoCfgVersion_V9.8.7_V1.6
10_665600_NoCfgVersion_V9.8.7_V1.6
10_800000_NoCfgVersion_V9.8.7_V1.6
10_1065600_NoCfgVersion_V9.8.7_V1.6
10_1331200_NoCfgVersion_V9.8.7_V1.6
10_1600000_NoCfgVersion_V9.8.7_V1.6
T210 nx-abca2 EristaIcosaHynix4gb 0x07 
10_40800_NoCfgVersion_V9.8.7_V1.6
10_68000_NoCfgVersion_V9.8.7_V1.6
10_102000_NoCfgVersion_V9.8.7_V1.6
10_204000_NoCfgVersion_V9.8.7_V1.6
10_408000_NoCfgVersion_V9.8.7_V1.6
10_665600_NoCfgVersion_V9.8.7_V1.6
10_800000_NoCfgVersion_V9.8.7_V1.6
10_1065600_NoCfgVersion_V9.8.7_V1.6
10_1331200_NoCfgVersion_V9.8.7_V1.6
10_1600000_NoCfgVersion_V9.8.7_V1.6
T210 nx-abca2 EristaIcosaSamsung6gb 0x07 
10_40800_NoCfgVersion_V9.8.7_V1.6
10_68000_NoCfgVersion_V9.8.7_V1.6
10_102000_NoCfgVersion_V9.8.7_V1.6
10_204000_NoCfgVersion_V9.8.7_V1.6
10_408000_NoCfgVersion_V9.8.7_V1.6
10_665600_NoCfgVersion_V9.8.7_V1.6
10_800000_NoCfgVersion_V9.8.7_V1.6
10_1065600_NoCfgVersion_V9.8.7_V1.6
10_1331200_NoCfgVersion_V9.8.7_V1.6
10_1600000_NoCfgVersion_V9.8.7_V1.6
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowax1x2Samsung4gb 0x03 
01_204000_NoCfgVersion_V0.3.1_V2.0
01_1331200.0_NoCfgVersion_V0.3.1_V2.0
01_1600000_NoCfgVersion_V0.3.1_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung4gb, MarikoHoagSamsung4gb 0x03 
01_204000_NoCfgVersion_V0.3.1_V2.0
01_1331200.0_NoCfgVersion_V0.3.1_V2.0
01_1600000_NoCfgVersion_V0.3.1_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung8gb, MarikoHoagSamsung8gb 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaHynix4gb, MarikoHoagHynix4gb 0x03 
01_204000_NoCfgVersion_V0.3.1_V2.0
01_1331200.0_NoCfgVersion_V0.3.1_V2.0
01_1600000_NoCfgVersion_V0.3.1_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaMicron4gb, MarikoHoagMicron4gb 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung4gbY 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung1y4gbX 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung1y8gbX 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoHoagSamsung1y4gbX 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung1y4gbY 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung1y8gbY 0x03 
01_204000_NoCfgVersion_V0.4.2_V2.0
01_1331200.0_NoCfgVersion_V0.4.2_V2.0
01_1600000_NoCfgVersion_V0.4.2_V2.0
T214 nx-abca2, nx-abcb, nx-abcc MarikoIowaSamsung1y4gbA 0x03 
01_204000_NoCfgVersion_V0.4.5_V2.0
01_1331200.0_NoCfgVersion_V0.4.5_V2.0
01_1600000_NoCfgVersion_V0.4.5_V2.0

nx-abca2 (Icosa in Erista, Iowa in Mariko) hardware types are variations of the retail and EDEV form factors.

nx-abcb (Copper) is the SDEV unit. Among other differences, this has extra hardware to support HDMI output.

[8.0.0+] nx-abcc (Hoag) was added for Mariko.

Erista memory is LPDDR4, while Mariko memory is LPDDR4X.

SecurityEngineInterruptNumber

SPL uses this for setting up the security engine IRQ.

FuseVersion

The current Package1 Maxver Constant - 1.

HardwareType

[1.0.0+] This item is obtained by checking bits 8 and 2 from FUSE_RESERVED_ODM4. It can be:

  • 0 (Icosa; Erista retail and EDEV), if development flag (bit 8) is Retail and production flag (bit 2) is Production.
  • 1 (Copper; Erista SDEV), if development flag (bit 8) is Development and production flag (bit 2) is Prototype.
  • 3 (Invalid).

Value 2 is reserved and considered invalid.

[4.0.0+] This item is obtained by checking bits 8, 2 and 16-19 from FUSE_RESERVED_ODM4. It can be:

  • 0 (Icosa; Erista retail and EDEV), if development flag (bit 8) is Retail and production flag (bit 2) is Production.
  • 1 (Copper; Erista SDEV), if development flag (bit 8) is Development and production flag (bit 2) is Prototype.
  • 3 (Iowa; Mariko retail and EDEV), if new hardware type (bits 16-19) is Iowa.
  • 4 (Invalid).

Value 2 is reserved and considered invalid.

[7.0.0+] This item can be obtained by checking bits 8, 2 and 16-19 from FUSE_RESERVED_ODM4, but is now only 0 (Icosa) or 0xF (Invalid) in retail units.

[8.0.0+] This item can be obtained by checking bits 8, 2 and 16-19 from FUSE_RESERVED_ODM4. It can be:

  • 0 (Icosa; Erista retail and EDEV), if development flag (bit 8) is Retail and production flag (bit 2) is Production.
  • 1 (Copper; Erista SDEV), if development flag (bit 8) is Development and production flag (bit 2) is Prototype.
  • 2 (Hoag; Mariko Lite retail and HDEV), if new hardware type (bits 16-19) is Hoag.
  • 3 (Iowa; Mariko retail and EDEV), if new hardware type (bits 16-19) is Iowa.
  • 4 (Calcio).
  • 5 (Invalid).

It is still only 0 (Icosa) or 0xF (Invalid) in retail units.

IsRetail

This item is obtained by checking bits 9 and 0-1 from FUSE_RESERVED_ODM4. It can be 0 (Debug), 1 (Retail) or 2 (Invalid).

IsRecoveryBoot

Used to determine if the system is booting from SafeMode firmware.

Under normal circumstances, this just returns bit 0 of the active bootloader info's attribute field.

DeviceId

NIM checks if this item matches the set:cal DeviceId with byte7 cleared. If they don't match, a panic is thrown.

BootReason
Value Description
0 Invalid
1 AcOk
2 OnKey
3 RtcAlarm1
4 RtcAlarm2

Used to determine how the system booted.

MemoryMode
Bits Description
0-3 Purpose (0 = None, 1 = ForStandard, 2 = ForAppletDev, 3 = ForSystemDev)
4-7 Size (0 = 4GB, 1 = 6GB, 2 = 8GB)

PM and the kernel decide memory arrangement based on MemoryMode.

MemoryArrange MemoryMode Description
0 0x01 Standard
1 0x02 StandardForAppletDev
2 0x03 StandardForSystemDev
3 0x11 Expanded
4 0x12 ExpandedForAppletDev
5 0x21 ExpandedForMarikoDev
IsDebugMode

Kernel uses this to determine behavior of svcBreak positive arguments. It will break instead of just force-exiting the process which is what happens on retail.

[2.0.0+] This is also used with certain debug SVCs.

[3.0.0+] RO checks this and if set then skipping NRR rsa signatures is allowed.

KernelConfiguration
Bits Description
0 EnableNonZeroFillMemory
1 EnableUserExceptionHandler
2 PerformanceMonitoringUnit
3 EnableApplicationExtraThread
8 CallShowErrorOnPanic
16-17 MemorySize

Kernel reads this when setting up memory-related code.

EnableNonZeroFillMemory is a boolean determining whether kernel should it will memset various allocated memory-regions with 0x58, 0x59, 0x5A ('X', 'Y', 'Z') instead of zero. This allows Nintendo devs to find uninitialized memory bugs.

EnableUserExceptionHandler is a boolean determining whether kernel should forcefully enable usermode exception handlers (when false, only certain aborts (((1LL << (esr >> 26)) & 0x1115804400224001) == 0, typically data/prefetch aborts) that occur when the faulting address is in a readable region with MemoryType_CodeStatic will trigger usermode exception handlers).

PerformanceMonitoringUnit is a boolean determining whether kernel should enable usermode access to the Performance Monitors (whether PMUSERENR_EL0 should be 1 or 0).

[8.0.0+] EnableApplicationExtraThread is a boolean determining whether the kernel should increase the KThread slabheap capacity by 160. This also increases object capacities that are calculated based on number of threads.

CallShowErrorOnPanic is a boolean determining whether kernel should call smcPanic on error instead of infinite-looping.

MemorySize determines how much memory is available. 00/03 = 4 GB, 01 = 6 GB, 02 = 8 GB.

IsChargerHiZModeEnabled

This tells if the TI Charger (bq24192) is active.

IsQuest

This item is bit 10 from FUSE_RESERVED_ODM4.

[4.0.0+] Settings uses this value to overwrite the quest flag from GetQuestFlag. This is used to detect if a Switch is a kiosk unit for display at retail stores.

RegulatorType
Value SoC GPU Power Blocks
0 T210 GM20B (0x12B) max77620_sd0, max77621_cpu and max77621_gpu
1 T214 GM20B_B (0x12E) max77620_sd0, max77812_cpu and max77812_gpu
2 T214 GM20B_B (0x12E) max77620_sd0, max77812_cpu and max77812_gpu

This item is currently hardcoded to 0.

[5.0.0+] PCV uses this value in combination with HardwareType to configure power blocks and memory tables for different hardware.

DeviceUniqueKeyGeneration

This item is obtained from FUSE_RESERVED_ODM2 if bit 11 from FUSE_RESERVED_ODM4 is set, FUSE_RESERVED_ODM0 matches 0x8E61ECAE and FUSE_RESERVED_ODM1 matches 0xF2BA3BB2.

[5.0.0+] FS can now use this value for the KeyGeneration parameter when calling GenerateAesKek during "GetBisEncryptionKey".

Package2Hash

This is a SHA-256 hash calculated over the package2 image. Since the hash calculation is an optional step in pkg2ldr, this item is only valid in recovery mode. Otherwise, an error is returned instead.

GenerateRandomBytes

Takes an u64 RndSize. Returns #Result and RndData.

The kernel limits RndSize to 0x38 (for fitting in return registers).

Panic

Takes an u32 PanicColor and issues a system panic.

The kernel always calls this with PanicColor set to 0xF00.

ConfigureCarveout

Takes an u64 CarveoutIdx, an u64 CarveoutAddr and an u64 CarveoutSize. Returns #Result.

If CarveoutIdx is 0, CarveoutAddr and CarveoutSize are used to configure MC_SECURITY_CARVEOUT4. If CarveoutIdx is 1, CarveoutAddr and CarveoutSize are used to configure MC_SECURITY_CARVEOUT5. Any other CarveoutIdx values are invalid.

The kernel calls this with CarveoutIdx set to 0, CarveoutAddr set to 0x80060000 and CarveoutSize set to a dynamically calculated size which covers all the kernel and built-in sysmodules' DRAM regions.

ReadWriteRegister

Takes an u64 RegAddr, an u32 RwMask and an u32 InValue. Returns #Result and an u32 OutValue.

Relays svcReadWriteRegister to the Secure Monitor.

CryptoUsecase

Value Name
0 Aes
1 RsaPrivate
2 RsaSecureExpMod
3 TitleKey

TitleKey represents a RSA wrapped AES key.

CipherMode

Value Name
0 CbcEncrypt
1 CbcDecrypt
2 Ctr

DecryptOrImportMode

Value Name
0 DecryptRsaPrivateKey
1 ImportLotusKey
2 ImportEsKey
3 ImportSslKey
4 ImportDrmKey

SecureExpModMode

Value Name
0 Lotus
1 Ssl
2 Drm

Result

Value Description
0 Success
1 Not implemented
2 Invalid argument
3 In progress
4 No async operation
5 Invalid async operation
[8.0.0+] 6 Not permitted
Retrieved from "https://switchbrew.org/w/index.php?title=Secure_Monitor&oldid=8732"