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KThread (edit)

Revision as of 01:48, 22 May 2020

2,717 bytes added ,  01:48, 22 May 2020
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[[Category:Kernel objects]]
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[[Category:Kernel synchronization objects]]
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class [[KThread]] extends [[KSynchronizationObject]];
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[[Category:Kernel interrupt events]]
 +
class [[KThread]] extends [[KSynchronizationObject]], [[KTimeableInterruptEvent]], [[KSendableInterruptEvent]] and [[KSchedulableInterruptEvent]];
    
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{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
−
! Offset
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! Offset
 
! Type
 
! Type
−
! Description
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! Description
 
|-
 
|-
 
| 0x0
 
| 0x0
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|-
 
|-
 
| 0x14
 
| 0x14
−
| u32
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| [[KTimeableInterruptEvent]]
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| Start of 0x10 byte unnamed kernel object in KThread
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| Used to suspend threads (*this)
 
|-
 
|-
 
| 0x24
 
| 0x24
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| u32
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| [[KSendableInterruptEvent]]
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| Start of 0x8 byte unnamed kernel object in KThread
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| Interrupt event (*this) sent to terminate a thread, except in the case just below
 
|-
 
|-
 
| 0x2C
 
| 0x2C
−
| u32
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| [[KSchedulableInterruptEvent]]
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| Start of unnamed kernel object of undetermined size in KThread
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| Interrupt event (*this) scheduled by the IRQ handler when the thread should terminate (*this)
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|-
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| 0x34
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| u8
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| Scheduling mask
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|-
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| 0x35
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| u8
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| Set to 1 when a thread is woken up from a svcSendSyncRequest call due to the ServerSession endpoint closing down
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|-
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| 0x36
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| s8
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| Indicates that the thread shall terminate
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|-
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| 0x37
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| u8
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| Indicates there was an error translating the parameters in the command buffer during an IPC call
 
|-
 
|-
 
| 0x38
 
| 0x38
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| 0x3C
 
| 0x3C
 
| u32
 
| u32
−
| Thread priority
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| Base thread priority
 
|-
 
|-
 
| 0x40
 
| 0x40
 
| u32
 
| u32
 
| Pointer to object the KThread is waiting on- can be a timer, event, session, etc.
 
| Pointer to object the KThread is waiting on- can be a timer, event, session, etc.
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|-
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| 0x44
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| Result
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| Status for object above
 
|-
 
|-
 
| 0x48
 
| 0x48
−
| u32
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| KObjectMutex*
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| Double pointer to KThread of unknown use/creation - used in scheduler
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| Locking kernel mutex
 
|-
 
|-
 
| 0x4C
 
| 0x4C
 
| u32
 
| u32
 
| Arbitration address
 
| Arbitration address
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|-
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| 0x50
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| KLinkedListNode*
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| Pointer to first KLinkedListNode in node list of objects this thread is waiting on
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|-
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| 0x54
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| KLinkedListNode*
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| Pointer to last KLinkedListNode in node list of objects this thread is
 
|-
 
|-
 
| 0x5C
 
| 0x5C
−
| KLinkedListNode*
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| [[KMutex|KMutexLinkedList]] *
−
| Objects the Thread waits for?
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| Set in some very specific circumstances
 
|-
 
|-
 
| 0x60
 
| 0x60
 
| u32
 
| u32
−
| Unknown list count
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| Count of KMutex objects this thread is using
 
|-
 
|-
 
| 0x64
 
| 0x64
 
| KLinkedListNode*
 
| KLinkedListNode*
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| First in unknown list
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| Pointer to first KLinkedListNode in node list of KMutex objects this thread is using
 
|-
 
|-
 
| 0x68
 
| 0x68
 
| KLinkedListNode*
 
| KLinkedListNode*
−
| Last in unknown list
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| Pointer to last KLinkedListNode in node list of KMutex objects this thread is using
 
|-
 
|-
 
| 0x6C
 
| 0x6C
 
| s32
 
| s32
−
| Thread priority
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| Dynamic thread priority
 
|-
 
|-
 
| 0x70
 
| 0x70
 
| s32
 
| s32
−
| Processor that created the thread
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| Processor that created the thread (in the sense of "first ran") ; processor the thread is running in
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|-
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| 0x74
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| [[KResourceLimit|KPreemptionTimer]] *
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| Points to [[KResourceLimit]]+0x60, which among other things holds the amount of CPU time available in ticks, or NULL
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|-
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| 0x7C
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| u8
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| Thread is alive
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|-
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| 0x7D
 +
| u8
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| Thread has been terminated
 
|-
 
|-
 
| 0x7E
 
| 0x7E
 
| u8
 
| u8
−
| Thread type - kernel threads are 0-2 and are assigned values based on where in the kernel the thread is created.  All threads created outside the kernel environment are type 3.
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| Thread affinity mask - set differently depending on whether the thread is created via svc call or from inside the kernel
 
|-
 
|-
 
| 0x80
 
| 0x80
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| 0x88
 
| 0x88
 
| u32*
 
| u32*
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| Ptr to svc mode register storage for KThread.
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| Ptr to svc mode register storage for KThread inside the thread context.
 
|-
 
|-
 
| 0x8C
 
| 0x8C
 
| u32*
 
| u32*
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| End-address of the page for this thread allocated in the [[Memory_layout|0xFF4XX000]] region. Thus, if the beginning of this mapped page is 0xFF401000, this ptr would be 0xFF402000.  Thread context page - used for thread svc stack, preserving svc mode registers and VFP exception register for thread.
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| End-address of the page for this thread context allocated in the [[Memory_layout|0xFF4XX000]] region. Thus, if the beginning of this mapped page is 0xFF401000, this ptr would be 0xFF402000.  Thread context page - used for thread svc stack, preserving svc mode registers and VFP exception register for thread.
 
|-
 
|-
 
| 0x90
 
| 0x90
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| 0x94
 
| 0x94
 
| void*
 
| void*
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| Ptr to threadlocalstorage
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| Ptr to [[Thread Local Storage]]
 
|-
 
|-
 
| 0x98
 
| 0x98
 
| void*
 
| void*
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| Ptr to threadlocalstorage in FCRAM via kernel vmem
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| Ptr to [[Thread Local Storage]] in FCRAM via kernel vmem
 
|-
 
|-
 
| 0xA0
 
| 0xA0
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| KThread*
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| KThreadLinkedListNode
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| Previous (virtual address)
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| Previous and next scheduled threads
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|-
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| 0xA8
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| KThreadLinkedList *
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| Pointer to linked list of scheduled threads that has stolen it, or 0 if in normal list
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|-
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| 0xAC
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| s32
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| Priority to restore after sleep if suspended, otherwise -1
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|}
 +
 
 +
With the following declarations: <code>struct KThreadLinkedList { KThread *first, *last; };</code> and <code>struct KThreadLinkedListNode { KThread *prev, *next; };</code>.
 +
 
 +
=Thread Scheduling Mask=
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The thread scheduling mask is made of a low nibble (enum) and a high nibble (bitfield).
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 +
Low nibble:
 +
 
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{| class="wikitable" border="1"
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|-
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! Value
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! Description
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|-
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| 0
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| The thread is not scheduled
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|-
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| 1
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| The thread is scheduled
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|-
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| 2
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| The thread is being terminated
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|}
 +
 
 +
High nibble:
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{| class="wikitable" border="1"
 
|-
 
|-
−
| 0xA4
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! Mask
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| KThread*
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! Description
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| Next (virtual address)
   
|-
 
|-
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| 0xA8
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| 0
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| struct { KThread* first; KThread* last; } ptr
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| Nothing special
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| Pointer to linked list that has stolen it, or 0 if in normal list
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|-
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| 0x8 (bit 3)
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| The thread has been debug-locked
 
|}
 
|}
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 +
A thread is scheduled *if and only if* its (full) scheduling mask is exactly 1. This allows debug-(un)locking of threads to be done transparently.
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=Thread Affinity Mask=
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If the thread is created via a call to SVC 8(CreateThread), which uses thread creation type 3, and the CPU ID is -2(meaning use the core specified in the exheader), the mask is just the affinity mask from the thread's owner KProcess.  If the CPU ID is -1(meaning any core), the affinity mask is set to 0xF on the New3DS and 0x3 on the Old3DS.  Otherwise, the affinity mask is (1 << cpu_id) | 1.
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 +
If the thread is created via a call by the kernel, which uses thread creation types 0-2, the checks for -1 and -2 are skipped and the mask is always (1 << cpu_id) | 1.
Retrieved from "https://www.3dbrew.org/wiki/Special:MobileDiff/11998...21249"

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