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|
if NT_INST
else
TITLE "Spin Locks"
;++
;
; Copyright (c) 1989 Microsoft Corporation
;
; Module Name:
;
; spinlock.asm
;
; Abstract:
;
; This module implements the routines for acquiring and releasing
; spin locks.
;
; Author:
;
; Bryan Willman (bryanwi) 13 Dec 89
;
; Environment:
;
; Kernel mode only.
;
; Revision History:
;
; Ken Reneris (kenr) 22-Jan-1991
; Removed KeAcquireSpinLock macros, and made functions
;--
PAGE
.386p
include ks386.inc
include callconv.inc ; calling convention macros
include i386\kimacro.inc
include mac386.inc
EXTRNP KfRaiseIrql,1,IMPORT,FASTCALL
EXTRNP KfLowerIrql,1,IMPORT,FASTCALL
EXTRNP _KeGetCurrentIrql,0,IMPORT
EXTRNP _KeBugCheck,1
_TEXT$00 SEGMENT PARA PUBLIC 'CODE'
ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
PAGE
SUBTTL "Acquire Kernel Spin Lock"
;++
;
; VOID
; KeInializeSpinLock (
; IN PKSPIN_LOCK SpinLock,
;
; Routine Description:
;
; This function initializes a SpinLock
;
; Arguments:
;
; SpinLock (TOS+4) - Supplies a pointer to an kernel spin lock.
;
; Return Value:
;
; None.
;
;--
cPublicProc _KeInitializeSpinLock ,1
cPublicFpo 1,0
mov eax, dword ptr [esp+4]
mov dword ptr [eax], 0
stdRET _KeInitializeSpinLock
stdENDP _KeInitializeSpinLock
PAGE
SUBTTL "Ke Acquire Spin Lock At DPC Level"
;++
;
; VOID
; KefAcquireSpinLockAtDpcLevel (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; This function acquires a kernel spin lock.
;
; N.B. This function assumes that the current IRQL is set properly.
; It neither raises nor lowers IRQL.
;
; Arguments:
;
; (ecx) SpinLock - Supplies a pointer to an kernel spin lock.
;
; Return Value:
;
; None.
;
;--
align 16
cPublicFastCall KefAcquireSpinLockAtDpcLevel, 1
cPublicFpo 0, 0
if DBG
push ecx
stdCall _KeGetCurrentIrql
pop ecx
cmp al, DISPATCH_LEVEL
jne short asld50
endif
ifdef NT_UP
fstRET KefAcquireSpinLockAtDpcLevel
else
;
; Attempt to assert the lock
;
asld10: ACQUIRE_SPINLOCK ecx,<short asld20>
fstRET KefAcquireSpinLockAtDpcLevel
;
; Lock is owned, spin till it looks free, then go get it again.
;
align 4
asld20: SPIN_ON_SPINLOCK ecx,<short asld10>
endif
if DBG
asld50: stdCall _KeBugCheck, <IRQL_NOT_GREATER_OR_EQUAL>
endif
fstENDP KefAcquireSpinLockAtDpcLevel
;++
;
; VOID
; KeAcquireSpinLockAtDpcLevel (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; Thunk for standard call callers
;
;--
cPublicProc _KeAcquireSpinLockAtDpcLevel, 1
cPublicFpo 1,0
ifndef NT_UP
mov ecx,[esp+4] ; SpinLock
aslc10: ACQUIRE_SPINLOCK ecx,<short aslc20>
stdRET _KeAcquireSpinLockAtDpcLevel
aslc20: SPIN_ON_SPINLOCK ecx,<short aslc10>
endif
stdRET _KeAcquireSpinLockAtDpcLevel
stdENDP _KeAcquireSpinLockAtDpcLevel
PAGE
SUBTTL "Ke Release Spin Lock From Dpc Level"
;++
;
; VOID
; KefReleaseSpinLockFromDpcLevel (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; This function releases a kernel spin lock.
;
; N.B. This function assumes that the current IRQL is set properly.
; It neither raises nor lowers IRQL.
;
; Arguments:
;
; (ecx) SpinLock - Supplies a pointer to an executive spin lock.
;
; Return Value:
;
; None.
;
;--
align 16
cPublicFastCall KefReleaseSpinLockFromDpcLevel ,1
cPublicFpo 0,0
ifndef NT_UP
RELEASE_SPINLOCK ecx
endif
fstRET KefReleaseSpinLockFromDpcLevel
fstENDP KefReleaseSpinLockFromDpcLevel
;++
;
; VOID
; KeReleaseSpinLockFromDpcLevel (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; Thunk for standard call callers
;
;--
cPublicProc _KeReleaseSpinLockFromDpcLevel, 1
cPublicFpo 1,0
ifndef NT_UP
mov ecx, [esp+4] ; (ecx) = SpinLock
RELEASE_SPINLOCK ecx
endif
stdRET _KeReleaseSpinLockFromDpcLevel
stdENDP _KeReleaseSpinLockFromDpcLevel
PAGE
SUBTTL "Ki Acquire Kernel Spin Lock"
;++
;
; VOID
; FASTCALL
; KiAcquireSpinLock (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; This function acquires a kernel spin lock.
;
; N.B. This function assumes that the current IRQL is set properly.
; It neither raises nor lowers IRQL.
;
; Arguments:
;
; (ecx) SpinLock - Supplies a pointer to an kernel spin lock.
;
; Return Value:
;
; None.
;
;--
align 16
cPublicFastCall KiAcquireSpinLock ,1
cPublicFpo 0,0
ifndef NT_UP
;
; Attempt to assert the lock
;
asl10: ACQUIRE_SPINLOCK ecx,<short asl20>
fstRET KiAcquireSpinLock
;
; Lock is owned, spin till it looks free, then go get it again.
;
align 4
asl20: SPIN_ON_SPINLOCK ecx,<short asl10>
else
fstRET KiAcquireSpinLock
endif
fstENDP KiAcquireSpinLock
PAGE
SUBTTL "Ki Release Kernel Spin Lock"
;++
;
; VOID
; FASTCALL
; KiReleaseSpinLock (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; This function releases a kernel spin lock.
;
; N.B. This function assumes that the current IRQL is set properly.
; It neither raises nor lowers IRQL.
;
; Arguments:
;
; (ecx) SpinLock - Supplies a pointer to an executive spin lock.
;
; Return Value:
;
; None.
;
;--
align 16
cPublicFastCall KiReleaseSpinLock ,1
cPublicFpo 0,0
ifndef NT_UP
RELEASE_SPINLOCK ecx
endif
fstRET KiReleaseSpinLock
fstENDP KiReleaseSpinLock
PAGE
SUBTTL "Try to acquire Kernel Spin Lock"
;++
;
; BOOLEAN
; KeTryToAcquireSpinLock (
; IN PKSPIN_LOCK SpinLock,
; OUT PKIRQL OldIrql
; )
;
; Routine Description:
;
; This function attempts acquires a kernel spin lock. If the
; spinlock is busy, it is not acquire and FALSE is returned.
;
; Arguments:
;
; SpinLock (TOS+4) - Supplies a pointer to an kernel spin lock.
; OldIrql (TOS+8) = Location to store old irql
;
; Return Value:
; TRUE - Spinlock was acquired & irql was raise
; FALSE - SpinLock was not acquired - irql is unchanged.
;
;--
align dword
cPublicProc _KeTryToAcquireSpinLock ,2
cPublicFpo 2,0
ifdef NT_UP
; UP Version of KeTryToAcquireSpinLock
mov ecx, DISPATCH_LEVEL
fstCall KfRaiseIrql
mov ecx, [esp+8] ; (ecx) -> ptr to OldIrql
mov [ecx], al ; save OldIrql
mov eax, 1 ; Return TRUE
stdRET _KeTryToAcquireSpinLock
else
; MP Version of KeTryToAcquireSpinLock
mov edx,[esp+4] ; (edx) -> spinlock
;
; First check the spinlock without asserting a lock
;
TEST_SPINLOCK edx,<short ttsl10>
;
; Spinlock looks free raise irql & try to acquire it
;
;
; raise to dispatch_level
;
mov ecx, DISPATCH_LEVEL
fstCall KfRaiseIrql
mov edx, [esp+4] ; (edx) -> spinlock
mov ecx, [esp+8] ; (ecx) = Return OldIrql
ACQUIRE_SPINLOCK edx,<short ttsl20>
mov [ecx], al ; save OldIrql
mov eax, 1 ; spinlock was acquired, return TRUE
stdRET _KeTryToAcquireSpinLock
ttsl10:
xor eax, eax ; return FALSE
stdRET _KeTryToAcquireSpinLock
ttsl20:
mov cl, al ; (cl) = OldIrql
fstCall KfLowerIrql ; spinlock was busy, restore irql
xor eax, eax ; return FALSE
stdRET _KeTryToAcquireSpinLock
endif
stdENDP _KeTryToAcquireSpinLock
PAGE
SUBTTL "Ki Try to acquire Kernel Spin Lock"
;++
;
; BOOLEAN
; KiTryToAcquireSpinLock (
; IN PKSPIN_LOCK SpinLock
; )
;
; Routine Description:
;
; This function attempts acquires a kernel spin lock. If the
; spinlock is busy, it is not acquire and FALSE is returned.
;
; Arguments:
;
; SpinLock (TOS+4) - Supplies a pointer to an kernel spin lock.
;
; Return Value:
; TRUE - Spinlock was acquired
; FALSE - SpinLock was not acquired
;
;--
align dword
cPublicProc _KiTryToAcquireSpinLock ,1
cPublicFpo 1,0
ifndef NT_UP
mov eax,[esp+4] ; (eax) -> spinlock
;
; First check the spinlock without asserting a lock
;
TEST_SPINLOCK eax,<short atsl20>
;
; Spinlock looks free try to acquire it
;
ACQUIRE_SPINLOCK eax,<short atsl20>
endif
mov eax, 1 ; spinlock was acquired, return TRUE
stdRET _KiTryToAcquireSpinLock
ifndef NT_UP
atsl20:
xor eax, eax ; return FALSE
stdRET _KiTryToAcquireSpinLock
endif
stdENDP _KiTryToAcquireSpinLock
_TEXT$00 ends
endif ; NT_INST
end
|
