.586p
.model flat,stdcall
option casemap:none

   
includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\user32.lib

include \masm32\include\kernel32.inc
include \masm32\include\user32.inc
include \masm32\include\windows.inc
;计算CPU频率
;使用如下变量
.data
hProcess   dd  ?                ;当前进程的句柄
hThread    dd  ?                ;当前线程句柄
oldPrioClass   dd  ?           ;当前线程的prioclass
oldPrio    dd  ?                  ;当前线程prio
theLoword  dd  ?              ;时间戳
theHighWord   dd   ?        ;时间戳到High

szBuffer dd  ?

.code
start:
invoke  GetCurrentProcess                       ;获取进程句柄
mov     hProcess , eax                              ;存值

invoke  GetPriorityClass,hProcess            ;得到进程的优化级
mov     oldPrioClass,eax                           ;句柄存

invoke  GetThreadPriority, hThread          ;线程优先级.
mov     oldPrio,eax                                    ; 存值

;转换程序为优先级

invoke  SetPriorityClass,hProcess,REALTIME_PRIORITY_CLASS       ;相当于100h
invoke  SetThreadPriority,hThread,THREAD_PRIORITY_TIME_CRITICAL ;等于 0Fh

invoke  Sleep,10            ;延时

RDTSC                            ;取时间戳
mov     theLoword,eax
mov     theHighWord,edx

invoke Sleep ,500           ;延时0.5秒

RDTSC                             ;取时间戳
sub     eax,theLoword       ;theloword=theloword-new loword
sbb     edx,theHighWord     ;带位减法
mov     theLoword,eax       ;新值存放
mov     theHighWord,edx     

invoke      SetThreadPriority,hThread,oldPrio             ;设置线程的优先级
invoke      SetPriorityClass,hProcess,oldPrioClass      ;设置进程的优先级 

;本计算基于上述第二个Sleep函数
;CPU 频率=Loword / (1000*延时)
mov     eax,theLoword
xor     edx,edx
mov     ebx,500000
div     ebx

mov szBuffer ,eax

invoke  MessageBox ,NULL,addr szBuffer,addr szBuffer,MB_OK

end start

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