166 lines
3.5 KiB
NASM
166 lines
3.5 KiB
NASM
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else
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TITLE "Spin Locks"
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; Copyright (c) 1989 Microsoft Corporation
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; Module Name:
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; spindbg.asm
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; Abstract:
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; Author:
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; Bryan Willman (bryanwi) 13 Dec 89
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; Environment:
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; Kernel mode only.
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; Revision History:
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PAGE
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.386p
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include ks386.inc
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include callconv.inc ; calling convention macros
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include mac386.inc
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if DBG
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EXTRNP _KeBugCheckEx,5
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EXTRNP _KeGetCurrentIrql,0,IMPORT
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ifdef DBGMP
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EXTRNP _KiPollDebugger,0
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endif
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extrn _KeTickCount:DWORD
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extrn _KiSpinlockTimeout:DWORD
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endif
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_TEXT$00 SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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; VOID
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; Kii386SpinOnSpinLock (
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; IN PKSPIN_LOCK SpinLock
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; IN ULONG Flag
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; )
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; Routine Description:
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; This function is called on a debug build to spin on a spinlock.
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; It is invoked by the DEBUG version of SPIN_ON_SPINLOCK macro.
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; Warning:
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; Not called with C calling conventions
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; Does not destroy any register
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cPublicProc Kii386SpinOnSpinLock,2
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if DBG
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cPublicFpo 2,2
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push eax
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push ebx
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mov eax, [esp+12] ; (eax) = LockAddress
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mov ebx, PCR[PcPrcbData.PbCurrentThread]
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or ebx, 1 ; or on busy bit
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cmp ebx, [eax] ; current thread the owner?
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je short ssl_sameid ; Yes, go abort
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ssl_10:
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mov ebx, _KeTickCount ; Current time
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add ebx, _KiSpinlockTimeout ; wait n ticks
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ifdef DBGMP
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test byte ptr [esp+16], 2 ; poll debugger while waiting?
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jnz short ssl_30
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endif
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; Spin while watching KeTickCount
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ssl_20: YIELD
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cmp _KeTickCount, ebx ; check current time
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jnc short ssl_timeout ; NC, too many ticks have gone by
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test dword ptr [eax], 1
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jnz short ssl_20
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ssl_exit:
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pop ebx ; Spinlock is not busy, return
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pop eax
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stdRET Kii386SpinOnSpinLock
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ifdef DBGMP
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; Spin while watching KeTickCount & poll debugger
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ssl_30: YIELD
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cmp _KeTickCount, ebx ; check current time
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jnc short ssl_timeout ; overflowed
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stdCall _KiPollDebugger
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test dword ptr [eax], 1
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jnz short ssl_30
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pop ebx ; Spinlock is not busy, return
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pop eax
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stdRET Kii386SpinOnSpinLock
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endif
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; Out of line expection conditions
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ssl_sameid:
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test byte ptr [esp+16], 1 ; ID check enabled?
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jz short ssl_10 ; no, continue
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; recursed on lock, abort
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stdCall _KeBugCheckEx,<SPIN_LOCK_ALREADY_OWNED,eax,0,0,0>
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ssl_timeout:
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test byte ptr [esp+16], 4 ; Timeout check enabled?
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jz short ssl_10 ; no, continue
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stdCall _KeGetCurrentIrql ; Check to see what level we're spinning at
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cmp al, DISPATCH_LEVEL
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mov eax, [esp+12] ; restore eax
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jc short ssl_10 ; if < dispatch_level, don't timeout
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test dword ptr [eax], 1 ; Check to see if spinlock was freed
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jz short ssl_exit
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public SpinLockSpinningForTooLong
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SpinLockSpinningForTooLong:
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int 3 ; Stop here
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jmp short ssl_10 ; re-wait
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else ; DBG
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stdRET Kii386SpinOnSpinLock
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endif
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stdENDP Kii386SpinOnSpinLock,2
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_TEXT$00 ends
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endif ; NT_INST
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end
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