PSC (Power State Control) provides services related to power state changes in the system.

Concept

psc:m allows a process to register a module that depends on power management in some way. A client calls GetPmModule to receive an IPmModule (Power Managed Module), and then calls IPmModule->Initialize(module_id, module_dependency_list) where module_id is the ModuleId enum member for the client, and the dependency list is an array of module IDs for the modules that this depends on. Initialize() returns an event handle that the client can wait on to be notified of a power state change.

psc:c allows a module to the power state controller for the system (in practice, AM is the only client to the controller). IPmControl->DispatchRequest() is used notify all IPmModules of a state change.

For example, FS registers itself as an IPmModule with dependencies on pinmux, gpio, pcv, tma, and initializes the SD card once those dependencies have registered..

It then does (basically) the following pseudocode (actual code located at .text + 0xB2DB0 in 6.0.0 FS):

   while (true) {
       Fs_IPmModule->WaitSignaled();
       
       Fs_IPmModule->GetRequest(&state);
       switch (state) {
           case WakingUp:
               /* hardware devices are woken up here */
           case GoingToSleep:
               /* hardware devices are put to sleep here */
           case ShuttingDown:
               /* hardware devices are turned off here */
       }
       
       Fs_IPmModule->Acknowledge(state);
   }

psc:c

This is "nn::psc::sf::IPmControl".

Cmd	Name
0	Initialize
1	DispatchRequest
2	GetResult
3	GetState
4	Cancel
5	[1.0.0-6.2.0] PrintModuleInformation
6	GetModuleInformation
10	[9.0.0+]
11	[9.0.0+]

psc:m

This is "nn::psc::sf::IPmService".

Cmd	Name	Notes
0	GetPmModule	Returns an #IPmModule.

IPmModule

This is "nn::psc::sf::IPmModule".

Cmd	Name
0	Initialize
1	GetRequest
2	Acknowledge
3	Finalize
4	[5.1.0+] AcknowledgeEx

psc:l

This was added with [9.0.0+].

Cmd	Name
0
1
2
3
4

srepo:u, srepo:a

These are "nn::srepo::detail::ipc::ISrepoService".

These were added with [5.0.0+].

Cmd	Name
10100
10101	[6.0.0+]
10200	[6.0.0+]
10201	[6.0.0+]
11000	[6.0.0+]
11001	[6.0.0+]
11002	[6.0.0+]
11003	[6.0.0+]
11004	[6.0.0+]
11100	[6.0.0+]
11200	[6.0.0+]
11300	[6.0.0+]
11400	[6.0.0+]
11500	[6.0.0+]
11600	[6.0.0+]
11601	[6.0.0+]
11602	[6.0.0+]
11700	[6.0.0+]
11800	[6.0.0+]
11801	[6.0.0+]
11810	[8.0.0+]
11811	[8.0.0+]
12000	[8.0.0+]
12001	[8.0.0+]
13000	[8.0.0+]
13001	[8.0.0+]
20100
20200
20300	[6.0.0+]
20400	[6.0.0+]
20401	[6.0.0+]
20402	[7.0.0+]
20500	[8.0.0+]

Cmd13000

Takes a type-0x5 input buffer, no output.

[9.0.0+] No input, returns a total of 0xC-bytes of output, an #IUnknown0, and a handle.

IUnknown0

Added with [9.0.0+].

Cmd	Name
0

Cmd0: no input, returns a total of 8-bytes of output.

ovln:rcv

This is "nn::ovln::IReceiverService".

Cmd	Name
0	OpenReceiver

IReceiver

This is "nn::ovln::IReceiver".

Cmd	Name
0	AddSource
1	RemoveSource
2	GetReceiveEventHandle
3	Receive
4	ReceiveWithTick

ovln:snd

This is "nn::ovln::ISenderService".

Cmd	Name
0	OpenSender

ISender

This is "nn::ovln::ISender".

Cmd	Name
0	Send
1	GetUnreceivedMessageCount

time:su

This is "nn::timesrv::detail::service::ITimeServiceManager".

This was added with [9.0.0+].

Cmd	Name
0
5
6
9
10
11
12
13
14
15
50
51
52
60
100
200
201
202

time:al

This is "nn::timesrv::detail::service::IAlarmService".

This was added with [9.0.0+].

Cmd	Name
0
1

Cmd0/cmd1: no input, returns an #ISteadyClockAlarm.

ISteadyClockAlarm

This is "nn::timesrv::detail::service::ISteadyClockAlarm".

This was added with [9.0.0+].

Cmd	Name
0
1
2
3
10
11

Cmd10

Opens a session for psc:l and returns it's interface.

time:m

This is "nn::timesrv::detail::service::IPowerStateRequestHandler".

This was added with [9.0.0+].

Cmd	Name
0
1

time:s, time:p

These are "nn::timesrv::detail::service::IStaticService".

These were added with [9.0.0+].

Cmd	Name	Notes
0	GetStandardUserSystemClock	Returns an #ISystemClock.
1	GetStandardNetworkSystemClock	Returns an #ISystemClock.
2	GetStandardSteadyClock	Returns an #ISteadyClock.
3	GetTimeZoneService	Returns an #ITimeZoneService.
4	GetStandardLocalSystemClock	Returns an #ISystemClock.
5	[4.0.0+] GetEphemeralNetworkSystemClock	Returns an #ISystemClock.
20	[6.0.0+] GetSharedMemoryNativeHandle
30	[6.0.0-8.1.0] GetStandardNetworkClockOperationEventReadableHandle
31	[6.0.0-8.1.0] GetEphemeralNetworkClockOperationEventReadableHandle
50	[4.0.0+] SetStandardSteadyClockInternalOffset
51	[9.0.0+] GetStandardSteadyClockRtcValue
100	IsStandardUserSystemClockAutomaticCorrectionEnabled
101	SetStandardUserSystemClockAutomaticCorrectionEnabled
102	[5.0.0+] GetStandardUserSystemClockInitialYear
200	[3.0.0+] IsStandardNetworkSystemClockAccuracySufficient
201	[6.0.0+] GetStandardUserSystemClockAutomaticCorrectionUpdatedTime
300	[4.0.0+] CalculateMonotonicSystemClockBaseTimePoint
400	[4.0.0+] GetClockSnapshot
401	[4.0.0+] GetClockSnapshotFromSystemClockContext
500	[4.0.0+] CalculateStandardUserSystemClockDifferenceByUser
501	[4.0.0+] CalculateSpanBetween

ISteadyClock

This is "nn::timesrv::detail::service::ISteadyClock".

Cmd	Name	Notes
0	GetCurrentTimePoint	No input, returns an output #SteadyClockTimePoint.
2	GetTestOffset	No input, returns an output #TimeSpanType.
3	SetTestOffset	Takes an input #TimeSpanType, no output.
100	[2.0.0+] GetRtcValue	No input, returns an output s64.
101	[2.0.0+] IsRtcResetDetected	No input, returns an output u8 bool.
102	[2.0.0+] GetSetupResultValue	No input, returns an output u32.
200	[3.0.0+] GetInternalOffset	No input, returns an output #TimeSpanType.
201	[3.0.0-3.0.2] SetInternalOffset	Takes an input #TimeSpanType, no output.

SteadyClockTimePoint

Offset	Size	Description
0x0	0x8	A u64 representing a point in time.
0x8	0x10	An ID representing the clock source.

This is a 0x18-byte struct.

TimeSpanType

This is an u64.

ISystemClock

This is "nn::timesrv::detail::service::ISystemClock".

Cmd	Name	Notes
0	GetCurrentTime	Returns an output #PosixTime.
1	SetCurrentTime	Takes an input #PosixTime.
2	GetSystemClockContext	Returns an output #SystemClockContext.
3	SetSystemClockContext	Takes an input #SystemClockContext.
4	[9.0.0+] GetOperationEventReadableHandle

PosixTime

This is an s64 for UTC POSIX time.

SystemClockContext

This is an 0x20-byte struct.

Offset	Size	Description
0x0	0x8	a #PosixTime representing the system clock epoch.
0x8	0x18	a #SteadyClockTimePoint

ITimeZoneService

This is "nn::timesrv::detail::service::ITimeZoneService".

Cmd	Name	Notes
0	GetDeviceLocationName	No input, returns an output #LocationName.
1	SetDeviceLocationName	Takes an input #LocationName, no output.
2	GetTotalLocationNameCount	No input, returns an output s32.
3	LoadLocationNameList
4	LoadTimeZoneRule	Takes an input #LocationName and a type-0x16 output buffer for #TimeZoneRule, no output.
5	[2.0.0+] GetTimeZoneRuleVersion	No input, returns an output #TimeZoneRuleVersion.
6	[5.0.0+] GetDeviceLocationNameAndUpdatedTime
7	[9.0.0+] SetDeviceLocationNameWithTimeZoneRule
8	[9.0.0+] ParseTimeZoneBinary
20	[9.0.0+] GetDeviceLocationNameOperationEventReadableHandle
100	ToCalendarTime	Takes an input #PosixTime and a type-0x15 input buffer for #TimeZoneRule, returns an output #CalendarTime and #CalendarAdditionalInfo.
101	ToCalendarTimeWithMyRule	Takes an input #PosixTime, returns an output #CalendarTime and #CalendarAdditionalInfo.
201	ToPosixTime	Takes an input #CalendarTime, a type-0x15 input buffer for #TimeZoneRule, an type-0xA output buffer for #PosixTime array, and returns an output s32.
202	ToPosixTimeWithMyRule	Takes an input #CalendarTime, an type-0xA output buffer for #PosixTime array, and returns an output s32.

LoadLocationNameList

Takes an input s32 LocationName_index and a type-0x6 output buffer for #LocationName, returns an output s32 for total output entries.

LocationName

This contains a TimeZone location string with a max size of 0x24 bytes.

TimeZoneRule

This is an 0x4000-byte struct. Official sw uses fixed-size 0x4000 for the buffer size with the above commands.

This is loaded from the TimeZoneBinary title with the specified LocationName under the zoneinfo/ directory, the content is then converted into this TimeZoneRule structure.

The files contained under zoneinfo/ directory are Tzif2 files without Tzif1 header and data at the begining of them (see RFC8536 for more information).

The conversion of a Tzif2 file to a TimeZoneRule structure is based on tz database code with some custom modifications (Leap seconds aren't handled, no usage of "posixrules" and Tzif1 support stripped out).

Offset	Size	Description
0x0	0x4	timecnt
0x4	0x4	typecnt
0x8	0x4	charcnt
0xC	0x1	goback
0xD	0x1	goahead
0xE	0x2	Padding
0x10	0x8 * 1000	ats
0x1f50	0x1 * 1000	types
0x2338	0x10 * 128	ttis (time type information), struct ttinfo[1000]
0x2b38	0x1 * 512	chars
0x2d38	0x4	defaulttype
0x2d3c	0x12c4	Reserved / Unused

ttinfo

This is an 0x10-byte struct. Represent a Time Type Information used in #TimeZoneRule.

Offset	Size	Description
0x0	0x4	tt_gmtoff
0x4	0x1	tt_isdst
0x5	0x3	Padding
0x8	0x4	tt_abbrind
0xC	0x1	tt_ttisstd
0xD	0x1	tt_ttisgmt
0xE	0x2	Padding

TimeZoneRuleVersion

This is an u128.

CalendarTime

Offset	Size	Description
0x0	0x2	Year
0x2	0x1	Month
0x3	0x1	Day
0x4	0x1	Hour
0x5	0x1	Minute
0x6	0x1	Second
0x7	0x1	Padding / unknown?

This is an 0x8-byte struct.

CalendarAdditionalInfo

Offset	Size	Description
0x0	0x4	0-based day-of-week.
0x4	0x4	0-based day-of-year.
0x8	0x8	Timezone name string.
0x10	0x4	0 = no DST, 1 = DST.
0x14	0x4	s32 seconds relative to UTC for this timezone.

This is an 0x18-byte struct. This stores timezone info.

ins:r

This is "nn::ins::IReceiverManager".

This was added with [9.0.0+].

Cmd	Name
0
1

Cmd0

Takes an input u32 InsID. Returns an u64.

Cmd1

Takes an input u32 InsID and an input u64 (unused, official software passes struct pointer). Returns an output Event handle with autoclear disabled.

ins:s

This is "nn::ins::ISenderManager".

This was added with [9.0.0+].

Cmd	Name
0	#Send

Send

Takes an input u32 SenderID and an input u64 (unused, official software passes struct pointer). Returns an output Event handle autoclear disabled.

PSC Module IDs

ID	Module
0x03
0x04	USB
0x05
0x07	Pcv
0x08	Pcv:Imm
0x09	Gpio
0x0A	Pinmux
0x0B	Uart
0x0C	I2c
0x0D	I2c:Pcv
0x0E	Sasbus
0x0F	Pwm
0x10
0x13	PCIe
0x14	Backlight
0x15	Nvnflinger
0x18	nn::psc::PmModuleId_Hid
0x1B
0x1C	Audio
0x1E
0x1F	Bluetooth
0x20	Bpc
0x21	Ptm
0x23	nn::psc::PmModuleId_Nfc
0x24	Ppc
0x25
0x26	Nifm
0x28	Npns
0x29	nn::psc::PmModuleId_Lm
0x2A	Bcat
0x2B	Time
0x2C	Pctl
0x2D	Erpt
0x2E	Eupld
0x2F	Friend
0x30	Glue
0x31	Account
0x32	SasBus
0x65	NV

Power Management States

ID	Name	Description
Awake	0	Everything is awake.
ReadyAwaken	1	Preparing to transition to awake.
ReadySleep	2	Preparing to transition to sleep.
ReadySleepCritical	3	Critical services are ready to sleep.
ReadyAwakenCritical	4	Critical services are ready to wake up.
ReadyShutdown	5	Preparing to transition to shutdown.

PSC services

Concept

psc:c

psc:m

IPmModule

psc:l

srepo:u, srepo:a

Cmd13000

IUnknown0

ovln:rcv

IReceiver

ovln:snd

ISender

time:su

time:al

ISteadyClockAlarm

Cmd10

time:m

time:s, time:p

ISteadyClock

SteadyClockTimePoint

TimeSpanType

ISystemClock

PosixTime

SystemClockContext

ITimeZoneService

LoadLocationNameList

LocationName

TimeZoneRule

ttinfo

TimeZoneRuleVersion

CalendarTime

CalendarAdditionalInfo

ins:r

Cmd0

Cmd1

ins:s

Send

PSC Module IDs

Power Management States