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