Lecture 21

_getproc proc near pushf ;Secure flag register contents push di ;== Determine whether model came before or after === 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 all equal to 1? je not_286_386 ;YES --> Not or 80286

;-- Test for determining whether 80486, or 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 je pende ;Are bits all equal to 0? ;YES --> It's an inc dl ;No --> it's either an or an ; 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

pushfd pop eax mov temp, eax mov eax,1 shl eax,21 push eax popfd pushfd pop eax shr eax,21 shr temp,21 cmp temp, eax inc dl je pende jmp pende ;Test is ended

#include "stdafx.h" #include 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 cpcw if ( *(((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 inc dx and cpz,0FF7Fh fldcw cpz fdisi fstcw cpz test cpz,80h jne gcende

;-- Test for 80287/ 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 PIC IRQ1 Synchronous Data Keyboard

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 = 2 char/s = 2.1 char/s = 2.3 char/s = 3 char/s :::::::::::::::: = 20 char/s = 21.8 char/s = 24 char/s = 26.7 char/s = 30 char/s Delay 00 ¼ Second 01 ½ Second 10 ¼ Second 11 1 Second

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