IDT(nobody is answering in the old thread)

[hanoi]

ok, i have following problem:
i want to write my IDT in C
but i get:
-when paging is on 3rd(14) in bochs
-when it's off 3rd(13) in bochs
- __attribute__ ((packed)) doesn't change anything
-i used the part union because the shitfting and logical operations look ugly(imho)

so here is the code, look at it
typedef struct {
   unsigned short int Offset1;
   unsigned short int Segment;
   unsigned short int t;
   unsigned short int Offset2;
} intdes;
typedef struct
{
   unsigned short limit;
   intdes *lIDT;
} IDTR;

typedef union
{
   void *p;
   unsigned short a;
   unsigned short b;
} part;

extern void unhandled();
void setVector(int nr, void *function);
void LIDT();

intdes IDT[256];
IDTR sysreg;

void main()
{
...
   for(i=0; i <256; i++)
   {
   setVector(i, (void *)(unhandled));
   }
   LIDT();
   asm("sti");
...
}

void setVector(int nr, void *function)
{
   intdes n;
   part p;
   p.p = function;
   n.Offset1 = p.a;
   n.Offset2 = p.b;
   n.Segment = 0x8;
   n.t = 0x8e00;
   IDT[nr] = n;
   return;
}


void LIDT()
{
   sysreg.limit = 1024;
   sysreg.lIDT = IDT;
   asm volatile ("lidt _sysreg");
   return;
}

thanks

[hanoi]

works

[Ozguxxx]

Hi people, why are you all trying to write all your idts in c? Is older work not working in your implementations? Or is it more robust or something? ???

[jrfritz]

It's easier...but I will have to make my IRQ functions in Asm :-\

[Pype.Clicker]

nah. Just the saving/restoring stub need to be written in ASM. Then, you're free to call [C_exception_handlers+eax*4] -- provided that eax is the interrupt number