Kernel/arch/x86/irq.c

   1 /*
   2  * AcessOS Microkernel Version
   3  * irq.c
   4  */
   5 #include <common.h>
   6
   7 // === CONSTANTS ===
   8 #define MAX_CALLBACKS_PER_IRQ   4
   9
  10 // === TYPES ===
  11 typedef void (*tIRQ_Callback)(void);
  12
  13 // === GLOBALS ===
  14 tIRQ_Callback   gIRQ_Handlers[16][MAX_CALLBACKS_PER_IRQ];
  15
  16 // === CODE ===
  17 /**
  18  * \fn void IRQ_Handler(tRegs *Regs)
  19  * \brief Handle an IRQ
  20  */
  21 void IRQ_Handler(tRegs *Regs)
  22 {
  23          int    i;
  24
  25         Regs->int_num -= 0xF0;  // Adjust
  26
  27         //Log("IRQ_Handler: (Regs={int_num:%i})", Regs->int_num);
  28
  29         for( i = 0; i < MAX_CALLBACKS_PER_IRQ; i++ )
  30         {
  31                 //Log(" IRQ_Handler: Call %p", gIRQ_Handlers[Regs->int_num][i]);
  32                 if( gIRQ_Handlers[Regs->int_num][i] )
  33                         gIRQ_Handlers[Regs->int_num][i]();
  34         }
  35
  36         outb(0x20, 0x20);       // ACK IRQ
  37         if(Regs->int_num >= 8)
  38                 outb(0xA0, 0x20);       // ACK IRQ (Secondary PIC)
  39 }
  40
  41 /**
  42  * \fn int IRQ_AddHandler( int Num, void (*Callback)(void) )
  43  */
  44 int IRQ_AddHandler( int Num, void (*Callback)(void) )
  45 {
  46          int    i;
  47         for( i = 0; i < MAX_CALLBACKS_PER_IRQ; i++ )
  48         {
  49                 if( gIRQ_Handlers[Num][i] == NULL ) {
  50                         gIRQ_Handlers[Num][i] = Callback;
  51                         return 1;
  52                 }
  53         }
  54
  55         return 0;
  56 }