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> OS Construction > Questions about processor IRQ |
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Fulgurance 31 Mar 2020, 12:04
I have performed that. It's work.
But i would like to alert my code when this error occured to do something else. I have tested to move byte stored into label address to indicate actual state error, but it don't work... How can i do that ? Code: format binary as "img" use16 org 0x7C00 cli lgdt [GDTR] mov eax,cr0 or eax,0x1 mov cr0,eax jmp 0x8:ProtectedMode use32 ProtectedMode: .Initialize: mov ax,0x10 mov ds,ax mov es,ax mov fs,ax mov gs,ax mov ss,ax lidt [IDTR] sti xor bx,bx div bx Main: hlt jmp Main include "IDT.fasm" GDT: db 0, 0, 0, 0, 0, 0, 0, 0 GDTCS: db 0xFF, 0xFF, 0x0, 0x0, 0x0, 10011011b, 11011111b, 0x0 GDTDS: db 0xFF, 0xFF, 0x0, 0x0, 0x0, 10010011b, 11011111b, 0x0 @@: GDTR: dw @b-GDT-1 dd GDT IDTR: .limit: dw @f-IDTDescriptor-1 .base: dd IDTDescriptor IDTDescriptor: .idt0: dw IDT.idt0,0x8,0x8E00,0x0 .idt1: dw IDT.idt1,0x8,0x8E00,0x0 .idt2: dw IDT.idt2,0x8,0x8E00,0x0 .idt3: dw IDT.idt3,0x8,0x8E00,0x0 .idt4: dw IDT.idt4,0x8,0x8E00,0x0 .idt5: dw IDT.idt5,0x8,0x8E00,0x0 .idt6: dw IDT.idt6,0x8,0x8E00,0x0 .idt7: dw IDT.idt7,0x8,0x8E00,0x0 .idt8: dw IDT.idt8,0x8,0x8E00,0x0 .idt9: dw IDT.idt9,0x8,0x8E00,0x0 .idt10: dw IDT.idt10,0x8,0x8E00,0x0 .idt11: dw IDT.idt11,0x8,0x8E00,0x0 .idt12: dw IDT.idt12,0x8,0x8E00,0x0 .idt13: dw IDT.idt13,0x8,0x8E00,0x0 .idt14: dw IDT.idt14,0x8,0x8E00,0x0 .idt15: dw IDT.idt15,0x8,0x8E00,0x0 .idt16: dw IDT.idt16,0x8,0x8E00,0x0 .idt17: dw IDT.idt17,0x8,0x8E00,0x0 .idt18: dw IDT.idt18,0x8,0x8E00,0x0 .idt19: dw IDT.idt19,0x8,0x8E00,0x0 .idt20: dw IDT.idt20,0x8,0x8E00,0x0 .idt21: dw IDT.idt21,0x8,0x8E00,0x0 .idt22: dw IDT.idt22,0x8,0x8E00,0x0 .idt23: dw IDT.idt23,0x8,0x8E00,0x0 .idt24: dw IDT.idt24,0x8,0x8E00,0x0 .idt25: dw IDT.idt25,0x8,0x8E00,0x0 .idt26: dw IDT.idt26,0x8,0x8E00,0x0 .idt27: dw IDT.idt27,0x8,0x8E00,0x0 .idt28: dw IDT.idt28,0x8,0x8E00,0x0 .idt29: dw IDT.idt29,0x8,0x8E00,0x0 .idt30: dw IDT.idt30,0x8,0x8E00,0x0 .idt31: dw IDT.idt31,0x8,0x8E00,0x0 .idt32: dw IDT.idt32,0x8,0x8E00,0x0 @@: db 510-($-$$) dup 0x90 dw 0xAA55 Code: IDT: .idt0: mov byte [0xB8000],'*' mov byte [0xB8001],00000010b mov byte [0xB8002],' ' mov byte [0xB8003],00000111b mov byte [0xB8004],'Z' mov byte [0xB8005],00000111b mov byte [0xB8006],'e' mov byte [0xB8007],00000111b mov byte [0xB8008],'r' mov byte [0xB8009],00000111b mov byte [0xB800A],'o' mov byte [0xB800B],00000111b iret .idt1: iret .idt2: iret .idt3: iret .idt4: iret .idt5: iret .idt6: iret .idt7: iret .idt8: iret .idt9: iret .idt10: iret .idt11: iret .idt12: iret .idt13: iret .idt14: iret .idt15: iret .idt16: iret .idt17: iret .idt18: iret .idt19: iret .idt20: iret .idt21: iret .idt22: iret .idt23: iret .idt24: iret .idt25: iret .idt26: iret .idt27: iret .idt28: iret .idt29: iret .idt30: iret .idt31: iret .idt32: iret |
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31 Mar 2020, 12:04 |
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edfed 31 Mar 2020, 13:17
try to lidt [IDTR] before pm switch. right after lgdt [GDTR] in the real mode code section.
plus, where do you execute code able to generate the isr0 routine? you also have to reprogram the pic in order to don't conflicts with cpu irq. |
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31 Mar 2020, 13:17 |
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Fulgurance 31 Mar 2020, 14:13
My code work, he generate int 0 routine, but if i code some code to save state into some data byte, he don't work.
Generated division zero error: Code: xor bx,bx
div bx If i had something that: Code: BoleanErrorByte: db 0x0 And add this instruction into my 0 IDT entry: Code: mov byte [BoleanErrorByte],0x1 This doesn't work, my byte isn't changed. But i would like to send change when this error occurred... |
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31 Mar 2020, 14:13 |
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edfed 31 Mar 2020, 15:48
where is located the BoleanErrorByte variable?
where is it in source? |
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31 Mar 2020, 15:48 |
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Fulgurance 31 Mar 2020, 15:54
It's an example, i have removed it because nothing append...
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31 Mar 2020, 15:54 |
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CandyMan 31 Mar 2020, 16:30
You must init new stack pointer in esp (not only ss). You also need this code:
Code: macro Delay { times 3 jmp short $+2 } SetPIC: mov al,11h out 20h,al Delay out $A0,al mov al,bl Delay out 21h,al mov al,bh Delay out $A1,al mov al,04h Delay out 21h,al mov al,02h Delay out $A1,al mov al,01h Delay out 21h,al Delay out $A1,al ret Copy this code below after LGDT instruction. Code:
mov bl,20h ;Master IRQ 32..39 (20h..27h)
mov bh,28h ;Slave IRQ 40..47 (28h..2Fh)
call SetPIC Code: .idt32: .idt33: .idt34: .idt35: .idt36: .idt37: .idt38: .idt39: push ax mov al,20h out 0x20,al pop ax iret .idt40: .idt41: .idt42: .idt43: .idt44: .idt45: .idt46: .idt47: push ax mov al,20h out 0x20,al out 0xA0,al pop ax iret _________________ smaller is better |
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31 Mar 2020, 16:30 |
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Fulgurance 31 Mar 2020, 19:28
In fact, if i understand good, i need to pass interrupt output into stack ? But how can i notify to my system interrupt have added something into stack ? I don't undertand
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31 Mar 2020, 19:28 |
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CandyMan 31 Mar 2020, 21:35
You must set the top of the stack. Add only instructions:
Code: mov ss,ax StackSize = 1024 mov esp,7C00h+StackSize You must also define which interrupts will be IRQ (by default they are 0x8 for master and 0x70 for slave). Because the first 32 interrupts in IDT are reserved for exceptions, to prevent conflicts (so that they do not repeat/overlap) you need to set them to e.g. 20h for master and 28h for slave. _________________ smaller is better |
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31 Mar 2020, 21:35 |
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Fulgurance 31 Mar 2020, 21:49
What ?
I don't understand what you would like to do... |
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31 Mar 2020, 21:49 |
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