816 lines
22 KiB
NASM
816 lines
22 KiB
NASM
title "Interlocked Support"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; intrlfst.asm
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;
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; Abstract:
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;
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; This module implements functions to support interlocked operations.
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; Interlocked operations can only operate on nonpaged data.
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;
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; This module implements the fast call version of the interlocked
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; fuctions.
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;
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; Author:
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;
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; Ken Reneris (kenr) 5-May-1994
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;
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; Environment:
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;
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; Any mode.
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;
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; Revision History:
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;
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;--
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.386p
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.xlist
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include ks386.inc
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include callconv.inc ; calling convention macros
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.list
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;++
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;
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; General Notes on Interlocked Procedures:
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;
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; These procedures assume that neither their code, nor any of
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; the data they touch, will cause a page fault.
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;
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; They use spinlocks to achieve MP atomicity, iff it's an MP machine.
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; (The spinlock macros generate zilch if NT_UP = 1, and
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; we if out some aux code here as well.)
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;
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; They turn off interrupts so that they can be used for synchronization
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; between ISRs and driver code. Flags are preserved so they can
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; be called in special code (Like IPC interrupt handlers) that
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; may have interrupts off.
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;
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;--
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page ,132
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subttl "ExInterlockedAddLargeStatistic"
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;++
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;
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; VOID
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; FASTCALL
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; ExInterlockedAddLargeStatistic (
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; IN PLARGE_INTEGER Addend,
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; IN ULONG Increment
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; )
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;
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; Routine Description:
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;
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; This function performs an interlocked add of an increment value to an
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; addend variable of type unsigned large integer.
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;
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; Arguments:
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;
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; (ecx) Addend - Supplies a pointer to the variable whose value is
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; adjusted by the increment value.
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;
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; (edx) Increment - Supplies the increment value that is added to the
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; addend variable.
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;
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; Return Value:
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;
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; None.
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;
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;--
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cPublicFastCall ExInterlockedAddLargeStatistic, 2
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cPublicFpo 0,0
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add dword ptr [ecx], edx ; add low part of large statistic
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adc dword ptr [ecx+4], 0 ; add carry to high part
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fstRET ExInterlockedAddLargeStatistic ; return
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fstENDP ExInterlockedAddLargeStatistic
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page , 132
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subttl "Interlocked Insert Head List"
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;++
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;
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; PLIST_ENTRY
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; ExfInterlockedInsertHeadList (
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; IN PLIST_ENTRY ListHead,
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; IN PLIST_ENTRY ListEntry
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; )
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;
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; Routine Description:
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;
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; This function inserts an entry at the head of a doubly linked list
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; so that access to the list is synchronized in a multiprocessor system.
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;
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; N.B. The pages of data which this routine operates on MUST be
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; present. No page fault is allowed in this routine.
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;
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; Arguments:
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;
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; (ecx) = ListHead - Supplies a pointer to the head of the doubly linked
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; list into which an entry is to be inserted.
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;
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; (edx) = ListEntry - Supplies a pointer to the entry to be inserted at the
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; head of the list.
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;
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; Return Value:
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;
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; Pointer to entry that was at the head of the list or NULL if the list
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; was empty.
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;
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;--
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cPublicFastCall ExfInterlockedInsertHeadList , 2
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cPublicFpo 0, 1
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pushfd
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cli
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mov eax, LsFlink[ecx] ; (eax)->next entry in the list
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mov [edx]+LsFlink, eax ; store next link in entry
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mov [edx]+LsBlink, ecx ; store previous link in entry
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mov [ecx]+LsFlink, edx ; store next link in head
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mov [eax]+LsBlink, edx ; store previous link in next
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popfd
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xor eax, ecx ; return null if list was empty
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jz short Eiih15
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xor eax, ecx
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Eiih15: fstRET ExfInterlockedInsertHeadList
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fstENDP ExfInterlockedInsertHeadList
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page , 132
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subttl "Interlocked Insert Tail List"
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;++
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;
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; PLIST_ENTRY
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; FASTCALL
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; ExfInterlockedInsertTailList (
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; IN PLIST_ENTRY ListHead,
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; IN PLIST_ENTRY ListEntry
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; )
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;
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; Routine Description:
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;
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; This function inserts an entry at the tail of a doubly linked list
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; so that access to the list is synchronized in a multiprocessor system.
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;
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; N.B. The pages of data which this routine operates on MUST be
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; present. No page fault is allowed in this routine.
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;
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; Arguments:
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;
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; (ecx) = ListHead - Supplies a pointer to the head of the doubly linked
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; list into which an entry is to be inserted.
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;
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; (edx) = ListEntry - Supplies a pointer to the entry to be inserted at the
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; tail of the list.
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;
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; Return Value:
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;
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; Pointer to entry that was at the tail of the list or NULL if the list
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; was empty.
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;
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;--
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cPublicFastCall ExfInterlockedInsertTailList, 2
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cPublicFpo 0, 1
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pushfd
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cli
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mov eax, LsBlink[ecx] ; (eax)->prev entry in the list
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mov [edx]+LsFlink, ecx ; store next link in entry
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mov [edx]+LsBlink, eax ; store previous link in entry
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mov [ecx]+LsBlink, edx ; store next link in head
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mov [eax]+LsFlink, edx ; store previous link in next
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popfd
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xor eax, ecx ; return null if list was empty
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jz short Eiit15
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xor eax, ecx
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Eiit15: fstRET ExfInterlockedInsertTailList
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fstENDP ExfInterlockedInsertTailList
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page , 132
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subttl "Interlocked Remove Head List"
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;++
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;
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; PLIST_ENTRY
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; FASTCALL
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; ExfInterlockedRemoveHeadList (
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; IN PLIST_ENTRY ListHead
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; )
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;
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; Routine Description:
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;
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; This function removes an entry from the head of a doubly linked list
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; so that access to the list is synchronized in a multiprocessor system.
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; If there are no entries in the list, then a value of NULL is returned.
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; Otherwise, the address of the entry that is removed is returned as the
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; function value.
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;
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; N.B. The pages of data which this routine operates on MUST be
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; present. No page fault is allowed in this routine.
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;
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; Arguments:
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;
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; (ecx) ListHead - Supplies a pointer to the head of the doubly linked
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; list from which an entry is to be removed.
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;
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; Return Value:
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;
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; The address of the entry removed from the list, or NULL if the list is
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; empty.
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;
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;--
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cPublicFastCall ExfInterlockedRemoveHeadList , 1
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cPublicFpo 0, 1
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pushfd
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cli
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mov eax, [ecx]+LsFlink ; (eax)-> next entry
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cmp eax, ecx ; Is list empty?
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je short Eirh20 ; if e, list is empty, go Eirh20
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mov edx, [eax]+LsFlink ; (ecx)-> next entry(after deletion)
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mov [ecx]+LsFlink, edx ; store address of next in head
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mov [edx]+LsBlink, ecx ; store address of previous in next
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if DBG
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mov [eax]+LsFlink, 0baddd0ffh
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mov [eax]+LsBlink, 0baddd0ffh
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endif
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popfd ; restore flags including interrupts
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fstRET ExfInterlockedRemoveHeadList
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Eirh20: popfd
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xor eax,eax ; (eax) = null for empty list
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fstRET ExfInterlockedRemoveHeadList
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fstENDP ExfInterlockedRemoveHeadList
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page , 132
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subttl "Interlocked Pop Entry Sequenced List"
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;++
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;
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; PSINGLE_LIST_ENTRY
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; FASTCALL
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; InterlockedPopEntrySList (
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; IN PSINGLE_LIST_ENTRY ListHead
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; )
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;
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; Routine Description:
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;
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; This function removes an entry from the front of a sequenced singly
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; linked list so that access to the list is synchronized in an MP system.
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; If there are no entries in the list, then a value of NULL is returned.
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; Otherwise, the address of the entry that is removed is returned as the
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; function value.
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;
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; N.B. The cmpxchg8b instruction is only supported on some processors.
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; If the host processor does not support this instruction, then
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; then following code is patched to contain a jump to the normal
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; pop entry code which has a compatible calling sequence and data
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; structure.
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;
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; Arguments:
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;
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; (ecx) = ListHead - Supplies a pointer to the sequenced listhead from
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; which an entry is to be removed.
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;
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; Return Value:
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;
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; The address of the entry removed from the list, or NULL if the list is
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; empty.
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;
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;--
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cPublicFastCall InterlockedPopEntrySList, 1
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cPublicFpo 0,2
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;
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; Save nonvolatile registers and read the listhead sequence number followed
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; by the listhead next link.
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;
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; N.B. These two dwords MUST be read exactly in this order.
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;
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push ebx ; save nonvolatile registers
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push ebp ;
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mov ebp, ecx ; save listhead address
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;
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; N.B. The following code is the continuation address should a fault
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; occur in the rare case described below.
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;
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public ExpInterlockedPopEntrySListResume
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ExpInterlockedPopEntrySListResume: ;
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mov edx, [ebp] + 4 ; get current sequence number
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mov eax, [ebp] + 0 ; get current next link
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;
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; If the list is empty, then there is nothing that can be removed.
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;
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Epop10: or eax, eax ; check if list is empty
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jz short Epop20 ; if z set, list is empty
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mov ecx, edx ; copy sequence number and depth
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add ecx, 0FFFFH ; adjust sequence number and depth
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;
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; N.B. It is possible for the following instruction to fault in the rare
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; case where the first entry in the list is allocated on another
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; processor and freed between the time the free pointer is read above
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; and the following instruction. When this happens, the access fault
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; code continues execution above at the resumption address and the
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; entire operation is retried.
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;
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public ExpInterlockedPopEntrySListFault
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ExpInterlockedPopEntrySListFault: ;
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mov ebx, [eax] ; get address of successor entry
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.586
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cmpxchg8b qword ptr [ebp] ; compare and exchange
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.386
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jnz short Epop10 ; if z clear, exchange failed
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;
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; Restore nonvolatile registers and return result.
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;
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cPublicFpo 0,0
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Epop20: pop ebp ; restore nonvolatile registers
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pop ebx ;
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fstRET InterlockedPopEntrySList
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fstENDP InterlockedPopEntrySList
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page , 132
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subttl "Interlocked Push Entry Sequenced List"
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;++
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;
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; PSINGLE_LIST_ENTRY
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; InterlockedPushEntrySList (
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; IN PSINGLE_LIST_ENTRY ListHead,
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; IN PSINGLE_LIST_ENTRY ListEntry
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; )
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;
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; Routine Description:
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;
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; This function inserts an entry at the head of a sequenced singly linked
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; list so that access to the list is synchronized in an MP system.
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;
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; N.B. The cmpxchg8b instruction is only supported on some processors.
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; If the host processor does not support this instruction, then
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; then following code is patched to contain a jump to the normal
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; push entry code which has a compatible calling sequence and data
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; structure.
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;
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; Arguments:
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;
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; (ecx) ListHead - Supplies a pointer to the sequenced listhead into which
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; an entry is to be inserted.
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;
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; (edx) ListEntry - Supplies a pointer to the entry to be inserted at the
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; head of the list.
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;
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; Return Value:
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;
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; Previous contents of ListHead. NULL implies list went from empty
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; to not empty.
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;
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;--
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cPublicFastCall InterlockedPushEntrySList, 2
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cPublicFpo 0,2
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;
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; Save nonvolatile registers and read the listhead sequence number followed
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; by the listhead next link.
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;
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; N.B. These two dwords MUST be read exactly in this order.
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;
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push ebx ; save nonvolatile registers
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push ebp ;
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mov ebp, ecx ; save listhead address
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mov ebx, edx ; save list entry address
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mov edx, [ebp] + 4 ; get current sequence number
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mov eax, [ebp] + 0 ; get current next link
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Epsh10: mov [ebx], eax ; set next link in new first entry
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mov ecx, edx ; copy sequence number
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add ecx, 010001H ; increment sequence number and depth
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.586
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cmpxchg8b qword ptr[ebp] ; compare and exchange
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.386
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jnz short Epsh10 ; if z clear, exchange failed
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;
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; Restore nonvolatile registers and return result.
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;
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cPublicFpo 0,0
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pop ebp ; restore nonvolatile registers
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pop ebx ;
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fstRET InterlockedPushEntrySList
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fstENDP InterlockedPushEntrySList
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page , 132
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subttl "Interlocked Flush Sequenced List"
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;++
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;
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; PSINGLE_LIST_ENTRY
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; FASTCALL
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; InterlockedFlushSList (
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; IN PSINGLE_LIST_ENTRY ListHead
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; )
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;
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; Routine Description:
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;
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; This function removes the entire list from a sequenced singly
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; linked list so that access to the list is synchronized in an MP system.
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; If there are no entries in the list, then a value of NULL is returned.
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; Otherwise, the address of the entry at the top of the list is removed
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; and returned as the function value and the list header is set to point
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; to NULL.
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;
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; N.B. The cmpxchg8b instruction is only supported on some processors.
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; If the host processor does not support this instruction, then
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; then following code is patched to contain a jump to the normal
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; pop entry code which has a compatible calling sequence and data
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; structure.
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;
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; Arguments:
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;
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; (ecx) = ListHead - Supplies a pointer to the sequenced listhead from
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; which the list is to be flushed.
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;
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; Return Value:
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;
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; The address of the entire current list, or NULL if the list is
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; empty.
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;
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;--
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cPublicFastCall InterlockedFlushSList, 1
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cPublicFpo 0,1
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;
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; Save nonvolatile registers and read the listhead sequence number followed
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; by the listhead next link.
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;
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; N.B. These two dwords MUST be read exactly in this order.
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;
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push ebx ; save nonvolatile registers
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push ebp ;
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mov ebp, ecx ; save listhead address
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mov edx, [ebp] + 4 ; get current sequence number
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mov eax, [ebp] + 0 ; get current next link
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;
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; N.B. The following code is the retry code should the compare
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; part of the compare exchange operation fail
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;
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; If the list is empty, then there is nothing that can be removed.
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;
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Efls10: or eax, eax ; check if list is empty
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jz short Efls20 ; if z set, list is empty
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mov ecx, 0 ; clear sequence number and depth
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mov ebx, 0 ; clear successor entry pointer
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.586
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cmpxchg8b qword ptr [ebp] ; compare and exchange
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.386
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jnz short Efls10 ; if z clear, exchange failed
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;
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; Restore nonvolatile registers and return result.
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;
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cPublicFpo 0,0
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Efls20: pop ebp ; restore nonvolatile registers
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pop ebx ;
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fstRET InterlockedFlushSList
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fstENDP InterlockedFlushSList
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page , 132
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subttl "Interlocked i386 Exchange Ulong"
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;++
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;
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; ULONG
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; FASTCALL
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; InterlockedExchange (
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; IN PULONG Target,
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; IN ULONG Value
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; )
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;
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; Routine Description:
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;
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; This function atomically exchanges the Target and Value, returning
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; the prior contents of Target
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;
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; See Exi386InterlockedExchangeUlong. This function is the i386
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; architectural specific version of ExInterlockedDecrementLong.
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; No source directly calls this function, instead
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; ExInterlockedDecrementLong is called and when built on x86 these
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; calls are macroed to the i386 optimized version.
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;
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; Arguments:
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;
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; (ecx) = Source - Address of ULONG to exchange
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; (edx) = Value - New value of ULONG
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;
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; Return Value:
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;
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; The prior value of Source
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;--
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cPublicFastCall InterlockedExchange, 2
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cPublicFpo 0,0
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.486
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mov eax, [ecx] ; get comperand value
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Ixchg: cmpxchg [ecx], edx ; compare and swap
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jnz Ixchg ; if nz, exchange failed
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.386
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fstRET InterlockedExchange
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fstENDP InterlockedExchange
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|
|
|
;++
|
|
;
|
|
; LONG
|
|
; InterlockedIncrement(
|
|
; IN PLONG Addend
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This function performs an interlocked add of one to the addend variable.
|
|
;
|
|
; No checking is done for overflow.
|
|
;
|
|
; Arguments:
|
|
;
|
|
; Addend (ecx) - Supplies a pointer to a variable whose value is to be
|
|
; incremented by one.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; (eax) - The incremented value.
|
|
;
|
|
;--
|
|
|
|
cPublicFastCall InterlockedIncrement,1
|
|
cPublicFpo 0,0
|
|
|
|
mov eax, 1 ; set increment value
|
|
|
|
.486
|
|
xadd [ecx], eax ; interlocked increment
|
|
.386p
|
|
inc eax ; adjust return value
|
|
|
|
fstRET InterlockedIncrement
|
|
|
|
fstENDP InterlockedIncrement
|
|
|
|
page , 132
|
|
subttl "InterlockedDecrment"
|
|
;++
|
|
;
|
|
; LONG
|
|
; InterlockedDecrement(
|
|
; IN PLONG Addend
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This function performs an interlocked add of -1 to the addend variable.
|
|
;
|
|
; No checking is done for overflow
|
|
;
|
|
; Arguments:
|
|
;
|
|
; Addend (ecx) - Supplies a pointer to a variable whose value is to be
|
|
; decremented by one.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; (eax) - The decremented value.
|
|
;
|
|
;--
|
|
|
|
cPublicFastCall InterlockedDecrement,1
|
|
cPublicFpo 0,0
|
|
|
|
mov eax, -1 ; set decrment value
|
|
|
|
.486
|
|
xadd [ecx], eax ; interlocked decrement
|
|
.386
|
|
|
|
dec eax ; adjust return value
|
|
|
|
fstRET InterlockedDecrement
|
|
|
|
fstENDP InterlockedDecrement
|
|
|
|
page , 132
|
|
subttl "Interlocked Compare Exchange"
|
|
;++
|
|
;
|
|
; PVOID
|
|
; FASTCALL
|
|
; InterlockedCompareExchange (
|
|
; IN OUT PVOID *Destination,
|
|
; IN PVOID Exchange,
|
|
; IN PVOID Comperand
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This function performs an interlocked compare of the destination
|
|
; value with the comperand value. If the destination value is equal
|
|
; to the comperand value, then the exchange value is stored in the
|
|
; destination. Otherwise, no operation is performed.
|
|
;
|
|
; Arguments:
|
|
;
|
|
; (ecx) Destination - Supplies a pointer to destination value.
|
|
;
|
|
; (edx) Exchange - Supplies the exchange value.
|
|
;
|
|
; [esp + 4] Comperand - Supplies the comperand value.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; The initial destination value is returned as the function value.
|
|
;
|
|
;--
|
|
|
|
cPublicFastCall InterlockedCompareExchange, 3
|
|
cPublicFpo 0,0
|
|
|
|
mov eax, [esp + 4] ; set comperand value
|
|
.486
|
|
cmpxchg [ecx], edx ; compare and exchange
|
|
.386
|
|
|
|
fstRET InterlockedCompareExchange
|
|
|
|
fstENDP InterlockedCompareExchange
|
|
|
|
page , 132
|
|
subttl "Interlocked Compare Exchange 64-bits"
|
|
;++
|
|
;
|
|
; LONGLONG
|
|
; FASTCALL
|
|
; ExInterlockedCompareExchange64 (
|
|
; IN PLONGLONG Destination,
|
|
; IN PLONGLONG Exchange,
|
|
; IN PLONGLONG Comperand
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This function performs a compare and exchange of 64-bits.
|
|
;
|
|
; N.B. The cmpxchg8b instruction is only supported on some processors.
|
|
; If the host processor does not support this instruction, then
|
|
; then following code is patched to contain a jump to the normal
|
|
; compare exchange 64-bit code which has a compatible calling
|
|
; sequence and data structure.
|
|
;
|
|
; Arguments:
|
|
;
|
|
; (ecx) Destination - Supplies a pointer to the destination variable.
|
|
;
|
|
; (edx) Exchange - Supplies a pointer to the exchange value.
|
|
;
|
|
; (esp+4) Comperand - Supplies a pointer to the comperand value.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; The current destination value is returned as the function value.
|
|
;
|
|
;--
|
|
|
|
cPublicFastCall ExInterlockedCompareExchange64, 3
|
|
|
|
cPublicFpo 0,1
|
|
|
|
;
|
|
; Save nonvolatile registers and read the exchange and comperand values.
|
|
;
|
|
|
|
push ebx ; save nonvolatile registers
|
|
push ebp ;
|
|
mov ebp, ecx ; set destination address
|
|
mov ebx, [edx] ; get exchange value
|
|
mov ecx, [edx] + 4 ;
|
|
mov edx, [esp] + 12 ; get comperand address
|
|
mov eax, [edx] ; get comperand value
|
|
mov edx, [edx] + 4 ;
|
|
|
|
.586
|
|
cmpxchg8b qword ptr[ebp] ; compare and exchange
|
|
.386
|
|
|
|
;
|
|
; Restore nonvolatile registers and return result in edx:eax.
|
|
;
|
|
|
|
cPublicFpo 0,0
|
|
|
|
pop ebp ; restore nonvolatile registers
|
|
pop ebx ;
|
|
|
|
fstRET ExInterlockedCompareExchange64
|
|
|
|
fstENDP ExInterlockedCompareExchange64
|
|
|
|
page , 132
|
|
subttl "Interlocked Exchange Add"
|
|
;++
|
|
;
|
|
; LONG
|
|
; FASTCALL
|
|
; InterlockedExchangeAdd (
|
|
; IN OUT PLONG Addend,
|
|
; IN LONG Increment
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This function performs an interlocked add of an increment value to an
|
|
; addend variable of type unsinged long. The initial value of the addend
|
|
; variable is returned as the function value.
|
|
;
|
|
; It is NOT possible to mix ExInterlockedDecrementLong and
|
|
; ExInterlockedIncrementong with ExInterlockedAddUlong.
|
|
;
|
|
;
|
|
; Arguments:
|
|
;
|
|
; (ecx) Addend - Supplies a pointer to a variable whose value is to be
|
|
; adjusted by the increment value.
|
|
;
|
|
; (edx) Increment - Supplies the increment value to be added to the
|
|
; addend variable.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; The initial value of the addend variable.
|
|
;
|
|
;--
|
|
|
|
cPublicFastCall InterlockedExchangeAdd, 2
|
|
cPublicFpo 0,0
|
|
|
|
.486
|
|
xadd [ecx], edx ; exchange add
|
|
.386
|
|
|
|
mov eax, edx ; set initial value
|
|
|
|
fstRET InterlockedExchangeAdd
|
|
|
|
fstENDP InterlockedExchangeAdd
|
|
|
|
_TEXT ends
|
|
end
|