Lecture 21

1. Lecture 21

2. _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

3. ;-- 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

4. 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

5. 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

6. #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

7. _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); }

8. 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"); }

9. _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

10. ;-- 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

11. KeyBoard Interface 60H Processor 64H INTR PIC IRQ1 Synchronous Data Keyboard

12. Port 64H Status Register 7 6 5 4 3 2 1 0 1 = Output Buffer full 1 = Parity Error 1 = Input Buffer full 1 = Time Out Error during input 1 = Time Out Error during output 1 = Keyboard Active

13. Typematic Rate 7 6 5 4 3 2 1 0 Typematic Rate 11111 = 2 char/s 11110 = 2.1 char/s 11101 = 2.3 char/s 11010 = 3 char/s :::::::::::::::: :::::::::::::::: 00100 = 20 char/s 00011 = 21.8 char/s 00010 = 24 char/s 00001 = 26.7 char/s 00000 = 30 char/s Delay 00 ¼ Second 01 ½ Second 10 ¼ Second 11 1 Second

14. Sending bytes to the Keyboard 60H Input from Keyboard 64H Input buffer full

15. Sending bytes to the Keyboard 60H From Processor Later on Receives 0xFA to indicate successful transmission 64H Output buffer full