KProcess

class KProcess extends KSynchronizationObject;

Size : 0x260 bytes

Offset	Type	Description
0x0	u32	Pointer to vtable
0x4	u32	Reference count
0x1C	volatile KThread*	0 or pointer to the thread the currently does something with the process object.
0x20	s16	?
0x30	KLinkedListNode*	Pointer to first KLinkedListNode in list of KMemoryBlocks used by the process
0x34	KLinkedListNode*	Pointer to last KLinkedListNode in list of KMemoryBlocks used by the process
0x40	u32	Translation table base
0x44	u8	Context ID
0x50	u32	Size of the MMU table
0x54	u32	Virtual address of the MMU table for this process
0x58	u32	Total size of all thread context pages (0xFF4xxxxx) owned by threads that belong to this process
0x5C	u32	Number of KThreadLocalPages used by this KProcess
0x60	KLinkedListNode*	Pointer to first KLinkedListNode in the list of KThreadLocalPages
0x64	KLinkedListNode*	Pointer to last KLinkedListNode in the list of KThreadLocalPages
0x6C	s32	Ideal processor
0x74	u32	Pointer to resource limits for process.
0x79	u8	Proc affinity mask
0x7C	u32	Number of threads which belong to this process.
0x80	0x10-bytes	SVC access control mask from the exheader kernel descriptors.
0x90	0x10-bytes	Interrupt flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xA0	u32	Kernel flags from the exheader kernel descriptors.
0xA4	u16	Handle table size from the exheader kernel descriptors. When this is 0, handle table is stored in WRAM.
0xA6	u16	Kernel release version field, from the exheader kernel descriptors.
0xA8	u32	Pointer to KCodeSet instance
0xAC	u32	Process id, this always begins at 0x0 for the first process.
0xB8	KThread*	Pointer to the process's main (?) thread.
0xCC	KProcessHandleTable	Pointer to the process's handle table. until 0x1C4 or longer
0x224	u32	?

Structure for 8.0.0-18 NATIVE_FIRM:

Size : 0x268 bytes

Offset	Type	Description
0x0	u32	Pointer to vtable
0x4	u32	Reference count
0x8	u32	KLinkedListNode count for object
0x30	KLinkedListNode*	Pointer to first KLinkedListNode in list of KMemoryBlocks used by the process
0x34	KLinkedListNode*	Pointer to last KLinkedListNode in list of KMemoryBlocks used by the process
0x4C	u32	End of userland virtual memory for the process
0x50	u32*	LINEAR memory virtual address(userland) base for this process.
0x58	u32	Size of the MMU table
0x5C	u32	Virtual address of the MMU table for this process
0x60	u32	Total size of all thread context pages (0xFF4xxxxx) owned by threads that belong to this process
0x64	u32	Number of KThreadLocalPages used by this KProcess
0x68	KLinkedListNode*	Pointer to first KLinkedListNode in the list of KThreadLocalPages
0x6C	KLinkedListNode*	Pointer to last KLinkedListNode in the list of KThreadLocalPages
0x74	s32	Ideal processor for this process
0x7C	u32	Pointer to resource limits for process.
0x84	u32	Number of threads which belong to this process.
0x88	0x10-bytes	SVC access control mask from the exheader kernel descriptors.
0x98	u32[4]	Interrupt flags- 32 interrupts per word, 4 words, 0x80 interrupts total divided evenly across 4 words
0xA8	u32	Kernel flags from the exheader kernel descriptors.
0xAC	u16	Handle table size from the exheader kernel descriptors. When this is 0, handle table is stored in WRAM.
0xAE	u16	Kernel release version field, from the exheader kernel descriptors.
0xB0	u32	Pointer to KCodeSet instance
0xB4	u32	Process id, this always begins at 0x0 for the first process.
0xC0	KThread*	Pointer to the process's main thread.
0xD4	KProcessHandleTable	This is the data for tracking and using all of the KProcess's handles.

KProcessHandleTable info struct:

Offset	Type	Description
0x0	HandleData*	Pointer to the process's handle table.
0x4	u16	The max number of handles that can be open at once - usually 0x200.
0x6	u16	Unknown
0x8	HandleData*	Pointer to the next open HandleData entry in the handle table.
0xC	u16	Total handles used by this KProcess.
0xE	u16	The current number of handles in use.
0x10	u32	Unknown
0x14	u32	Unknown
0x16	u32	Unknown
0x18	HandleData[28]	This small handle data table internal to the KProcess is only used in certain processes that don't have an external handle data table in FCRAM. It is all zeros in most processes.

HandleData struct:

Offset	Type	Description
0x0	u32	Handle info
0x4	u32	Pointer to the kernel object that the handle references.

The handle info u32 works as such:

The high byte is a remainder from the pointer to the next entry that originally occupied the handle table entry. It is unused. Byte 2 is either the class type token starting with firmware version 9.0 or the lowest byte of the char* that points to the class type name in firmware versions below 9.0. The lower halfword is the handle number of the current handle taken from the total handle count for the KProcess that owns the table.

On table creation, each entry in the handle data table is populated with a pointer to the next entry in the table. When a new handle is created, that pointer is moved into offset 0x8 of the KProcessHandleTable info struct to use for generation of the next handle.

The final handle that gets returned when a handle is created is (handle_index | (handle_total << 15)), basically they take the index into the handle data table and OR that with the total handle count << 15. This returned value is the one that gets passed back to the running application and is used to look up the HandleData entry in the table.