Lecture 21

_getproc proc near

pushf ;Secure flag register contents push di

;== Determine whether model came before or after 80286 ===

xor ax,ax ;Set AX to 0 push ax ;and push onto stack popf ;Pop flag register off of stack pushf ;Push back onto stack pop ax ;and pop off of AX and ax,0f000h ;Do not clear the upper four bits cmp ax,0f000h ;Are bits 12 - 15 all equal to 1? je not_286_386 ;YES --> Not 80386 or 80286

;-- Test for determining whether 80486, 80386 or 80286 ------

mov dl,p_80286 ;In any case, it's one of the mov ax,07000h ;three processors push ax ;Push 07000h onto stack popf ;Pop flag register off pushf ;and push back onto the stack pop ax ;Pop into AX register and ax,07000h ;Mask everything except bits 12-14 je pende ;Are bits 12 - 14 all equal to 0?

;YES --> It's an 80286 inc dl ;No --> it's either an 80386 or an

;80486. First set to 386

cli ;No interrupts now mov ebx,offset array mov [ebx],eax pushfd pop eax mov first,eax;

mov [ebx+1],eax pushfd pop eax shr first,18 shr eax,18 and first,1 and eax,1 cmp first,eax inc dl

sti jne pende

pushfdpop eaxmov temp, eax mov eax,1shl eax,21push eaxpopfdpushfdpop eaxshr eax,21shr temp,21cmp temp, eaxinc dlje pende

jmp pende ;Test is ended

#include "stdafx.h"#include <stdio.h>#include <dos.h>unsigned long int id[3];unsigned char ch='\0';unsigned int steppingid ;unsigned int model,family,type1;unsigned int cpcw;int main(int argc, char* argv[]){

_asm xor eax,eax_asm cpuid_asm mov id[0], ebx;_asm mov id[4], edx;_asm mov id[8], ecx;printf("%s\n ", (char *) (id));_asm mov eax,1_asm cpuid_asm mov ecx,eax_asm AND eax,0xf;_asm mov steppingid,eax;_asm mov eax, ecx

_asm shr eax,4_asm and eax, 0xf;_asm mov model,eax_asm mov eax,ecx_asm shr eax,8_asm and eax, 0xf_asm mov family,eax;_asm mov eax,ecx_asm shr eax,12_asm and eax, 0x3;_asm mov type1, eax;printf("\nstepping is %d\n model is %d\n

Family is %d\nType is%d\n",steppingid,model,family,type1);

}

void main{

_asm finit_asm mov byte ptr cpcw+1, 0;_asm fstcw cpcwif ( *(((char *) (&cpcw))+1)==3)

puts("Coprocessor found");else

puts ("Coprocessor not found");}

_getco proc near mov dx,co_none mov byte ptr cs:wait1,NOP_CODE mov byte ptr cs:wait2,NOP_CODE

wait1: finit mov byte ptr cpz+1,0

wait2: fstcw cpz cmp byte ptr cpz+1,3 jne gcende

;-- Coprocessor exists. Test for 8087 --- inc dx and cpz,0FF7Fh fldcw cpz fdisi fstcw cpz test cpz,80h jne gcende

;-- Test for 80287/80387 ---- inc dx finit fld1 fldz fdiv fld st fchs fcompp fstsw cpz mov ah,byte ptr cpz+1 sahf je gcende

inc dx gcende: mov ax,dx

ret _getco endp

KeyBoard Interface

64H

60H

Processor

INTR

PICIRQ1

Synchronous Data Keyboard

7 6 5 4 3 2 1 0

Port 64H Status Register

1 = Output Buffer full

1 = Input Buffer full

1 = Keyboard Active

1 = Parity Error

1 = Time Out Error during input

1 = Time Out Error during output

Typematic Rate

Typematic Rate11111 = 2 char/s11110 = 2.1 char/s11101 = 2.3 char/s11010 = 3 char/s::::::::::::::::::::::::::::::::00100 = 20 char/s00011 = 21.8 char/s00010 = 24 char/s00001 = 26.7 char/s00000 = 30 char/s

Delay00 ¼ Second01 ½ Second10 ¼ Second11 1 Second

7 6 5 4 3 2 1 0

Sending bytes to the Keyboard

60H

64H

Input from Keyboard

Input buffer full

Sending bytes to the Keyboard

60H

64H

From Processor

Output buffer full

Later on

Receives 0xFA to indicate successful transmission