IoApicLib.c

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#include <Base.h>
 
#include <Library/IoApicLib.h>
 
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/LocalApicLib.h>
 
#include <Register/IoApic.h>
 
UINT32
EFIAPI
IoApicRead (
  IN UINTN  Index
  )
{
  ASSERT (Index < 0x100);
  MmioWrite8 (PcdGet32 (PcdIoApicBaseAddress) + IOAPIC_INDEX_OFFSET, (UINT8)Index);
  return MmioRead32 (PcdGet32 (PcdIoApicBaseAddress) + IOAPIC_DATA_OFFSET);
}
 
UINT32
EFIAPI
IoApicWrite (
  IN UINTN   Index,
  IN UINT32  Value
  )
{
  ASSERT (Index < 0x100);
  MmioWrite8 (PcdGet32 (PcdIoApicBaseAddress) + IOAPIC_INDEX_OFFSET, (UINT8)Index);
  return MmioWrite32 (PcdGet32 (PcdIoApicBaseAddress) + IOAPIC_DATA_OFFSET, Value);
}
 
VOID
EFIAPI
IoApicEnableInterrupt (
  IN UINTN    Irq,
  IN BOOLEAN  Enable
  )
{
  IO_APIC_VERSION_REGISTER         Version;
  IO_APIC_REDIRECTION_TABLE_ENTRY  Entry;
 
  Version.Uint32 = IoApicRead (IO_APIC_VERSION_REGISTER_INDEX);
  ASSERT (Version.Bits.MaximumRedirectionEntry < 0xF0);
  ASSERT (Irq <= Version.Bits.MaximumRedirectionEntry);
 
  Entry.Uint32.Low = IoApicRead (IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX + Irq * 2);
  Entry.Bits.Mask  = Enable ? 0 : 1;
  IoApicWrite (IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX + Irq * 2, Entry.Uint32.Low);
}
 
VOID
EFIAPI
IoApicConfigureInterrupt (
  IN UINTN    Irq,
  IN UINTN    Vector,
  IN UINTN    DeliveryMode,
  IN BOOLEAN  LevelTriggered,
  IN BOOLEAN  AssertionLevel
  )
{
  IO_APIC_VERSION_REGISTER         Version;
  IO_APIC_REDIRECTION_TABLE_ENTRY  Entry;
 
  Version.Uint32 = IoApicRead (IO_APIC_VERSION_REGISTER_INDEX);
  ASSERT (Version.Bits.MaximumRedirectionEntry < 0xF0);
  ASSERT (Irq <= Version.Bits.MaximumRedirectionEntry);
  ASSERT (Vector <= 0xFF);
  ASSERT (DeliveryMode < 8 && DeliveryMode != 6 && DeliveryMode != 3);
 
  Entry.Uint32.Low           = IoApicRead (IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX + Irq * 2);
  Entry.Bits.Vector          = (UINT8)Vector;
  Entry.Bits.DeliveryMode    = (UINT32)DeliveryMode;
  Entry.Bits.DestinationMode = 0;
  Entry.Bits.Polarity        = AssertionLevel ? 0 : 1;
  Entry.Bits.TriggerMode     = LevelTriggered ? 1 : 0;
  Entry.Bits.Mask            = 1;
  IoApicWrite (IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX + Irq * 2, Entry.Uint32.Low);
 
  Entry.Uint32.High        = IoApicRead (IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX + Irq * 2 + 1);
  Entry.Bits.DestinationID = GetApicId ();
  IoApicWrite (IO_APIC_REDIRECTION_TABLE_ENTRY_INDEX + Irq * 2 + 1, Entry.Uint32.High);
}