Source code of Windows XP (NT5)
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; /*;; Copyright (c) 1997 Microsoft Corporation;; Module Name:;; fastsys.inc;; Abstract:;; This module implements the header for Fast System Calls for Intel; x86 family processors.;; Author:;; Bryan M. Willman (bryanwi) 09-Jan-1998;; Environment:;; kernel mode.;; Revision History:;; Peter Johnston (peterj) 07-May-1998; Add support for AMD implementation.;;--
if 0 ; Begin C only code */
// CPUID Feature bit in EDX indicating that fast system calls are supported
#define KI_FAST_SYSCALL_SUPPORTED 0x0800
#define MSR_SYSENTER_CS 0x00000174#define MSR_SYSENTER_ESP 0x00000175#define MSR_SYSENTER_EIP 0x00000176
#define MSR_EXT_FEATURE_ENABLE 0xC0000080#define MSR_SYSCALL_TARGET_ADDR 0xC0000081
//
// Define bits in the Extended Feature Enable Register (EFER) (MSR).
//
#define MSR_EFER_SCE 0x1
/*endif;; Begin Assembly definitions;
iSYSENTER macro db 0fH,34Hendm ;; SYSENTER
iSYSEXIT macro db 0fH,35Hendm ;; SYSEXIT
iSYSCALL macro db 0fH,05Hendm ;; SYSCALL
iSYSRET macro db 0fH,07Hendm ;; SYSRET
; */
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