75 lines
1.6 KiB
NASM
75 lines
1.6 KiB
NASM
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title "Processor Type and Stepping Detection"
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;++
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;
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; Copyright (c) 2000 Microsoft Corporation
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;
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; Module Name:
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;
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; cpu.asm
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;
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; Abstract:
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;
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; This module implements the code necessary to determine cpu information.
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;
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; Author:
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;
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; David N. Cutler (davec) 10-Jun-2000
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;
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; Environment:
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;
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; Kernel mode only.
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;
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;--
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include ksamd64.inc
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;++
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;
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; VOID
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; KiCpuId (
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; ULONG Function,
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; PCPU_INFO CpuInfo
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; );
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;
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; Routine Description:
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;
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; Executes the cpuid instruction and returns the resultant register
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; values.
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;
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; Arguments:
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;
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; ecx - Supplies the cpuid function value.
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;
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; rdx - Supplies the address a cpu information structure.
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;
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; Return Value:
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;
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; The return values from the cpuid instruction are stored in the specified
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; cpu infomation structure.
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;
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;--
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CiFrame struct
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SavedRbx dq ? ; saved register RBX
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CiFrame ends
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NESTED_ENTRY KiCpuId, _TEXT$00
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push_reg rbx ; save nonvolatile register
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END_PROLOGUE
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mov eax, ecx ; set cpuid function
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mov r9, rdx ; save information structure address
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cpuid ; get cpu information
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mov CpuEax[r9], eax ; save cpu information in structure
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mov CpuEbx[r9], ebx ;
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mov CpuEcx[r9], ecx ;
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mov CpuEdx[r9], edx ;
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pop rbx ; restore nonvolatile registeer
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ret ; return
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NESTED_END KiCpuId, _TEXT$00
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end
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