Kernel/arch/x86/irq.c

   1 /*
   2  * AcessOS Microkernel Version
   3  * irq.c
   4  */
   5 #include <acess.h>
   6
   7 // === CONSTANTS ===
   8 #define MAX_CALLBACKS_PER_IRQ   4
   9 #define TRACE_IRQS      0
  10
  11 // === TYPES ===
  12 typedef void (*tIRQ_Callback)(int, void *);
  13
  14 // === PROTOTYPES ===
  15 void    IRQ_Handler(tRegs *Regs);
  16
  17 // === GLOBALS ===
  18 tIRQ_Callback   gIRQ_Handlers[16][MAX_CALLBACKS_PER_IRQ];
  19 void    *gaIRQ_DataPointers[16][MAX_CALLBACKS_PER_IRQ];
  20
  21 // === CODE ===
  22 /**
  23  * \fn void IRQ_Handler(tRegs *Regs)
  24  * \brief Handle an IRQ
  25  */
  26 void IRQ_Handler(tRegs *Regs)
  27 {
  28          int    i, irq = Regs->int_num - 0xF0;
  29
  30         //Log("IRQ_Handler: (Regs={int_num:%i})", Regs->int_num);
  31
  32         for( i = 0; i < MAX_CALLBACKS_PER_IRQ; i++ )
  33         {
  34                 if( gIRQ_Handlers[irq][i] ) {
  35                         gIRQ_Handlers[irq][i](irq, gaIRQ_DataPointers[irq][i]);
  36                         #if TRACE_IRQS
  37                         if( irq != 8 )
  38                                 Log("IRQ %i: Call %p", Regs->int_num, gIRQ_Handlers[Regs->int_num][i]);
  39                         #endif
  40                 }
  41         }
  42
  43         //Log(" IRQ_Handler: Resetting");
  44         if(irq >= 8)
  45                 outb(0xA0, 0x20);       // ACK IRQ (Secondary PIC)
  46         outb(0x20, 0x20);       // ACK IRQ
  47         //Log("IRQ_Handler: RETURN");
  48 }
  49
  50 /**
  51  * \fn int IRQ_AddHandler( int Num, void (*Callback)(int) )
  52  */
  53 int IRQ_AddHandler( int Num, void (*Callback)(int, void*), void *Ptr )
  54 {
  55          int    i;
  56         for( i = 0; i < MAX_CALLBACKS_PER_IRQ; i++ )
  57         {
  58                 if( gIRQ_Handlers[Num][i] == NULL ) {
  59                         Log_Log("IRQ", "Added IRQ%i Cb#%i %p", Num, i, Callback);
  60                         gIRQ_Handlers[Num][i] = Callback;
  61                         gaIRQ_DataPointers[Num][i] = Ptr;
  62                         return 1;
  63                 }
  64         }
  65
  66         Log_Warning("IRQ", "No free callbacks on IRQ%i", Num);
  67         return 0;
  68 }