Display services

The only image data contained in this sysmodule is basically a saved display framebuffer, no image data for actively-used layers/framebuffers.

mm:u

NVIDIA multimedia (NvMM) platform service.

Cmd	Name
0	?
1	?
2	?
3	?
4	module_init_clk
5	module_deinit_clk
6	module_set_clk_rate
7	module_get_clk_rate

vi:u

This is "nn::visrv::sf::IApplicationRootService".

Cmd	Name
0	GetDisplayService

GetDisplayService

Returns an #IApplicationDisplayService. Takes an input u32, user-processes use 0 or 1, with 0 for regular-applications normally. 0 = user-service(vi:u), 1 = non-user-service? Returns an error when using value 1 with vi:u(same error listed below for IApplicationDisplayService for unavailable commands).

vi:s

This is "nn::visrv::sf::ISystemRootService".

Cmd	Name
1	GetDisplayService
3	GetDisplayServiceWithProxyNameExchange

GetDisplayService

Returns an #IApplicationDisplayService. Same input as vi:u.

GetDisplayServiceWithProxyNameExchange

Returns an #IApplicationDisplayService.

vi:m

This is "nn::visrv::sf::IManagerRootService".

Cmd	Name
2	GetDisplayService
3	GetDisplayServiceWithProxyNameExchange

GetDisplayService

Returns an #IApplicationDisplayService. Same input as vi:u.

GetDisplayServiceWithProxyNameExchange

Takes an input u64 and u32. Returns an #IApplicationDisplayService.

IApplicationDisplayService

Cmd	Name
100	#GetRelayService
101	#GetSystemDisplayService
102	#GetManagerDisplayService
103	#GetIndirectDisplayTransactionService
1000	#ListDisplays
1010	#OpenDisplay
1011	#OpenDefaultDisplay
1020	#CloseDisplay
1101	#SetDisplayEnabled
1102	#GetDisplayResolution
2020	#OpenLayer
2021	#CloseLayer
2030	#CreateStrayLayer
2031	#DestroyStrayLayer
2101	#SetLayerScalingMode
2450	#GetIndirectLayerImageMap
2451	#GetIndirectLayerImageCropMap
2460	#GetIndirectLayerImageRequiredMemoryInfo
5202	#GetDisplayVsyncEvent
5203	#GetDisplayVsyncEventForDebug

Available sessions for each service:

• "vi:u": Only GetRelayService.
• "vi:s": Everything except GetManagerDisplayService.
• "vi:m": All.

When attempting to use a get-session cmd with a service it's not available with, error 0xA72 is returned.

These commands using PIDs have AppletResourceUserId as the last input u64, hence AppletResourceUserId must match the user-process PID(no special handling for value 0).

GetRelayService

Returns an IHOSBinderDriver interface which abstracts "nn::visrv::service::RelayServiceImpl".

GetIndirectDisplayTransactionService

Returns an IHOSBinderDriver interface which abstracts "nn::visrv::service::IndirectDisplayTransactionServiceImpl".

GetSystemDisplayService

Returns an #ISystemDisplayService.

GetManagerDisplayService

Returns an #IManagerDisplayService.

ListDisplays

Takes a type-0x6 output buffer containing the array of #DisplayInfo output entries. Returns an output u64: total number of output entries.

Normally(?) this only returns the "Default" display.

OpenDisplay

Takes a #DisplayName as input. Returns an output u64, the DisplayId.

To open the default display, input string "Default" can be used.

OpenDefaultDisplay

Returns an output u64.

Probably not (?) used by newer official user-processes, since those use OpenDisplay with the default string instead.

CloseDisplay

Takes an input u64, DisplayId.

SetDisplayEnabled

Takes an input u32 boolean, and an u64(DisplayId?).

GetDisplayResolution

Takes an input u64 DisplayId and returns two output u64s: width and height.

OpenLayer

Takes a PID-descriptor, a type-0x6 buffer for the output #NativeWindow, a #DisplayName(which was previously used with #OpenDisplay), an u64 LayerId, and an u64 AppletResourceUserId. Returns an output u64 NativeWindow_Size.

Official user-processes use a LayerId stored in a global state field("...ExternalLayerId") if non-zero, otherwise:

• When AppletResourceUserId==0, #CreateStrayLayer is used instead of the OpenLayer cmd.
• When AppletResourceUserId!=0, AM_services#CreateManagedDisplayLayer is used and the output from that is used for LayerId with the OpenLayer cmd.

This OpenLayer command returns error 0x272 when the AppletResourceUserId is invalid.

CloseLayer

Takes an input u64: LayerId which was used with #OpenLayer.

CreateStrayLayer

Takes a type-0x6 buffer for the output #NativeWindow, an u32(LayerFlags bitmask), and an u64 DisplayId. Returns two output u64s: LayerId and NativeWindow_Size.

DestroyStrayLayer

Takes an input u64: LayerId from #CreateStrayLayer.

SetLayerScalingMode

Takes an input u32("ScalingMode") and u64.

GetIndirectLayerImageMap

Takes a PID-descriptor, an type-0x46 buffer, and four u64s: width(s32), height(s32), <output from AM GetIndirectLayerConsumerHandle>, and AppletResourceUserId. Returns two output u64s.

GetIndirectLayerImageCropMap

Takes a PID-descriptor, an type-0x46 buffer, four floats, four u64s(last u64 is AppletResourceUserId). Returns two output u64s. The floats are stored immediately after each other(32bits).

GetIndirectLayerImageRequiredMemoryInfo

Takes two input u64s: with and height. Returns two output u64s. First u64 is the buffer size to use with the ImageMap cmds.

GetDisplayVsyncEvent

Takes an input u64 DisplayId and returns a handle.

GetDisplayVsyncEventForDebug

Takes an input u64 DisplayId and returns a handle.

ISystemDisplayService

Cmd	Name
1200	GetZOrderCountMin
1202	GetZOrderCountMax
1203	GetDisplayLogicalResolution
1204	SetDisplayMagnification
2201	SetLayerPosition
2203	SetLayerSize
2204	GetLayerZ
2205	SetLayerZ
2207	SetLayerVisibility
2209	SetLayerAlpha
2312	CreateStrayLayer
2400	OpenIndirectLayer
2401	CloseIndirectLayer
2402	FlipIndirectLayer
3000	ListDisplayModes
3001	ListDisplayRgbRanges
3002	ListDisplayContentTypes
3200	GetDisplayMode
3201	SetDisplayMode
3202	GetDisplayUnderscan
3203	SetDisplayUnderscan
3204	GetDisplayContentType
3205	SetDisplayContentType
3206	GetDisplayRgbRange
3207	SetDisplayRgbRange
3208	GetDisplayCmuMode
3209	SetDisplayCmuMode
3210	GetDisplayContrastRatio
3211	SetDisplayContrastRatio
3214	GetDisplayGamma
3215	SetDisplayGamma
3216	GetDisplayCmuLuma
3217	SetDisplayCmuLuma

IManagerDisplayService

Cmd	Name
1102	GetDisplayResolution
2010	CreateManagedLayer
2011	DestroyManagedLayer
2050	CreateIndirectLayer
2051	DestroyIndirectLayer
2052	CreateIndirectProducerEndPoint
2053	DestroyIndirectProducerEndPoint
2054	CreateIndirectConsumerEndPoint
2055	DestroyIndirectConsumerEndPoint
2300	AcquireLayerTexturePresentingEvent
2301	ReleaseLayerTexturePresentingEvent
2302	GetDisplayHotplugEvent
2402	GetDisplayHotplugState
4201	SetDisplayAlpha
4203	SetDisplayLayerStack
4205	SetDisplayPowerState
6000	AddToLayerStack
6001	RemoveFromLayerStack
6002	SetLayerVisibility
7000	SetContentVisibility
8000	SetConductorLayer
8100	SetIndirectProducerFlipOffset

DisplayInfo

Offset	Size	Description
0x0	0x40	#DisplayName
0x40	0x8?	Normally 0x1 for the "Default" Display?
0x48	0x8?	Normally 0x1 for the "Default" Display?
0x50	0x8?	Width
0x58	0x8?	Height

This is a 0x60-byte structure.

The width/height for the "Default" Display is the resolution for 1080p even when in handheld-mode.

DisplayName

This is a 0x40-byte block: a NUL-terminated string.

Can be "Default", "External", "Edid", "Internal" or "Null".

Parcel

Offset	Size	Description
0x0	0x4	ParcelDataSize
0x4	0x4	ParcelDataOffset
0x8	0x4	ParcelObjectsSize
0xC	0x4	ParcelObjectsOffset
0x10	?	FlattenedBinder

NativeWindow

Max size of this buffer is 0x100-bytes(outbuf size used by official user-processes). Parsed("...DeserializeNativeWindow()") by a function called by the code described under #OpenLayer, which executes code with Android symbols.

This is a #Parcel.

ParcelData

This normally contains the following:

Offset	Size	Description
0x0	0x4	0x2
0x4	0x4	Probably the user-process PID?
0x8	0x4	ID
...	...	...

The above ID is used for the ID param for the binder commands with IHOSBinderDriver.