User:Bellezzasolo/IDT problems: Difference between revisions
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== Problems with IDTs == |
== Problems with IDTs == |
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Many of us while OS dev'ing will encounter a problem with IDT's. I won't pretend to be an IDT agony aunt - in fact I' |
Many of us while OS dev'ing will encounter a problem with IDT's. I won't pretend to be an IDT agony aunt - in fact I've been in trouble myself. |
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That is why I created this page - a wiki page you can easily access that's in a nice format. Introduction aside, |
That is why I created this page - a wiki page you can easily access that's in a nice format. Introduction aside, here are the solved problems. |
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This is for solved problems. The unsolved ones can be found here on the |
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[http://forum.osdev.org/viewtopic.php?f=1&t=24805 Forum] |
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==Problems== |
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'''Feel free to add content, this is forum style''' |
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{{stub|nocat=1}} |
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Please post '''''Completed''''' problems here. |
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First of all check your GDT. Then check padding issues. |
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== My problem == |
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Please note before you give me GCC specific adivce I have a slightly unusual setup. My setup is MS VC++ 2010 Express SP1 with the [Updated] Windows SDK, enabling 64 bit development. I use a separate assembly layer. I am currently writing my bootloader, but as I will use a custom file system I am currently testing the 32 bit version with the [http://www.brokenthorn.com/Resources/OSDevIndex.html bootloader] available at BrokenThorn, which is a tutorial on a PE kernel. My kernel is higher half at 0xC0000000, and has no memory magager (it relies on the bootloader's). I intend to change this in the near future. It does however, manage it's GDT. My kernel works perfectly without interrupts, and even presents a command line. This is one of the reasons I want IRQ's however, I can only get 1 character. '''This might be changed ''very soon!'''''. When I enable interrupts, the machine reboots. And again.... ad infanatum. |
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Now you understand the environment, this is the bochs output |
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<pre> |
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interrupt(): not accessible or not code segment cs = 0x0008 |
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interrupt(): gate descriptor not valid sys seg (vector = 0x0d) |
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interrupt(): not accessible or not code segment cs = 0x0008 |
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Machine is in protected mode (active) |
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CS.mode = 32 bit |
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SS.mode = 32 bit |
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</pre> |
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I don't know where I'm going wrong. I am using the ''linear'' address, as told to. If you need the code, here it is: |
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IDT.h |
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<source lang="cpp"> |
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//definitions |
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#define PRESENT 0x80 |
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#define USRPRIV 0x60 |
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#define KRNLPRV 0x0 |
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#define TASK32 0x5 |
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#define INTR16 0x6 |
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#define TRAP16 0x7 |
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#define INTR32 0xE |
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#define TRAP32 0xF |
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void setvect(char vect, void(*function)(void), unsigned char priv = (PRESENT|KRNLPRV|INTR32)); |
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void installIDT(); |
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</source> |
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IDT.cpp |
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<source lang="cpp"> |
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#include "IDT.h" |
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#include "..\Asm\Asmlayer.h" |
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#include <cstddef.h> |
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#include <stdout.h> |
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#include "panic.h" |
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//structures |
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class IDT_entry { |
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public: |
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#ifdef WIN32 |
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unsigned short baseLow; |
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unsigned short segment; |
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unsigned char reserved; |
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unsigned char flags; |
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unsigned short baseHigh; |
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#else |
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unsigned short baseLow; |
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unsigned short segment; |
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unsigned char reserved; |
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unsigned char flags; |
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unsigned short baseMed; |
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unsigned int baseHigh; |
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unsigned int reserved2; |
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#endif |
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}; |
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class IDT_reg { |
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public: |
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unsigned short limit; |
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IDT_entry* base; |
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}; |
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//data |
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#pragma pack(push,1) |
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static IDT_reg IDT_register; |
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#pragma pack(pop) |
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#pragma pack(push,1) |
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static IDT_entry IDT [256] = {0}; |
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#pragma pack(pop) |
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//functions |
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void setvect(char vect, void(*function)(void), unsigned char priv) |
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{ |
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#ifdef WIN32 |
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IDT[vect].flags = priv; |
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IDT[vect].segment = (0x8); //Kernel mode |
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IDT[vect].reserved = 0; |
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IDT[vect].baseLow = (unsigned short)(unsigned int)function&0xFFFF; |
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IDT[vect].baseHigh = (unsigned short)(unsigned int)function>>16; |
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#else |
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IDT[vect].flags = priv; |
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IDT[vect].segment = (0x8); //Kernel mode |
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IDT[vect].reserved = 0; |
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IDT[vect].reserved2 = 0; |
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IDT[vect].baseLow = (unsigned short)(unsigned long long)function&0xFFFF; |
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IDT[vect].baseMed = (unsigned short)((unsigned long long)function>>16)&0xFFFF; |
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IDT[vect].baseHigh = (unsigned int)(unsigned long long)function>>16; |
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#endif |
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} |
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void installIDT() |
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{ |
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if(sizeof(IDT_reg) != 6) |
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{ |
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Puts("Bad IDT reg\n"); |
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} |
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#ifdef WIN32 |
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if(sizeof(IDT_entry) != 8) |
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{ |
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Puts("Bad IDT struct\n"); |
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} |
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#else |
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if(sizeof(IDT_entry) != 16) |
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{ |
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Puts("Bad IDT struct\n"); |
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} |
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#endif |
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IDT_register.base = &IDT[0]; |
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#ifdef WIN32 |
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IDT_register.limit = 256*8-1; |
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#else |
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IDT_register.limit = 256*16-1; |
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#endif |
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lidt(&IDT_register); |
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} |
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//ISR's |
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//These are called from assembly wrappers which handle the brunt |
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extern "C" { |
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void defaultHandler() |
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{ |
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disable(); |
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setColor(0x4,0xF); |
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Cls(); |
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Puts(panicScreen); |
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halt(); |
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} |
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} |
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</source> |
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Finally, my assembly routine |
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<source lang="asm"> |
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BITS 32 ;my 32 bit version |
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extern @defaultHandler@0 |
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@handlerDefault@0: |
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pushad |
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call @defaultHandler@0 |
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popad |
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iret |
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BITS 64 ;and my 64 bit version |
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extern defaultHandler |
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handlerDefault: |
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call pusha |
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call defaultHandler |
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call popa |
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iretq |
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</source> |
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This links fine, what's going wrong? |
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--[[User:Bellezzasolo|Bellezzasolo]] 02:51, 5 February 2012 (CST) |
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== Related links == |
== Related links == |
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| Line 166: | Line 19: | ||
*[[I_Cant_Get_Interrupts_Working|Interrupt problems]] |
*[[I_Cant_Get_Interrupts_Working|Interrupt problems]] |
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[[Category:X86 CPU]] |
[[:Category:X86 CPU]] |
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[[Category:Interrupts]] |
[[:Category:Interrupts]] |
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[[Category:Troubleshooting]] |
[[:Category:Troubleshooting]] |
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[[Category:User drafts]] |
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Latest revision as of 19:57, 16 June 2024
Problems with IDTs
Many of us while OS dev'ing will encounter a problem with IDT's. I won't pretend to be an IDT agony aunt - in fact I've been in trouble myself. That is why I created this page - a wiki page you can easily access that's in a nice format. Introduction aside, here are the solved problems.
This is for solved problems. The unsolved ones can be found here on the Forum
Problems
This page is a stub.
You can help the wiki by accurately adding more contents to it.
Please post Completed problems here.
First of all check your GDT. Then check padding issues.
Related links
Category:X86 CPU Category:Interrupts Category:Troubleshooting