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audk/OvmfPkg/8259InterruptControllerDxe/8259.c

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/** @file
This contains the installation function for the driver.
Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "8259.h"
//
// Global for the Legacy 8259 Protocol that is produced by this driver
//
EFI_LEGACY_8259_PROTOCOL mInterrupt8259 = {
Interrupt8259SetVectorBase,
Interrupt8259GetMask,
Interrupt8259SetMask,
Interrupt8259SetMode,
Interrupt8259GetVector,
Interrupt8259EnableIrq,
Interrupt8259DisableIrq,
Interrupt8259GetInterruptLine,
Interrupt8259EndOfInterrupt
};
//
// Global for the handle that the Legacy 8259 Protocol is installed
//
EFI_HANDLE m8259Handle = NULL;
UINT8 mMasterBase = 0xff;
UINT8 mSlaveBase = 0xff;
EFI_8259_MODE mMode = Efi8259ProtectedMode;
UINT16 mProtectedModeMask = 0xffff;
UINT16 mLegacyModeMask;
UINT16 mProtectedModeEdgeLevel = 0x0000;
UINT16 mLegacyModeEdgeLevel;
//
// Worker Functions
//
/**
Write to mask and edge/level triggered registers of master and slave PICs.
@param[in] Mask low byte for master PIC mask register,
high byte for slave PIC mask register.
@param[in] EdgeLevel low byte for master PIC edge/level triggered register,
high byte for slave PIC edge/level triggered register.
**/
VOID
Interrupt8259WriteMask (
IN UINT16 Mask,
IN UINT16 EdgeLevel
)
{
IoWrite8 (LEGACY_8259_MASK_REGISTER_MASTER, (UINT8) Mask);
IoWrite8 (LEGACY_8259_MASK_REGISTER_SLAVE, (UINT8) (Mask >> 8));
IoWrite8 (LEGACY_8259_EDGE_LEVEL_TRIGGERED_REGISTER_MASTER, (UINT8) EdgeLevel);
IoWrite8 (LEGACY_8259_EDGE_LEVEL_TRIGGERED_REGISTER_SLAVE, (UINT8) (EdgeLevel >> 8));
}
/**
Read from mask and edge/level triggered registers of master and slave PICs.
@param[out] Mask low byte for master PIC mask register,
high byte for slave PIC mask register.
@param[out] EdgeLevel low byte for master PIC edge/level triggered register,
high byte for slave PIC edge/level triggered register.
**/
VOID
Interrupt8259ReadMask (
OUT UINT16 *Mask,
OUT UINT16 *EdgeLevel
)
{
UINT16 MasterValue;
UINT16 SlaveValue;
if (Mask != NULL) {
MasterValue = IoRead8 (LEGACY_8259_MASK_REGISTER_MASTER);
SlaveValue = IoRead8 (LEGACY_8259_MASK_REGISTER_SLAVE);
*Mask = (UINT16) (MasterValue | (SlaveValue << 8));
}
if (EdgeLevel != NULL) {
MasterValue = IoRead8 (LEGACY_8259_EDGE_LEVEL_TRIGGERED_REGISTER_MASTER);
SlaveValue = IoRead8 (LEGACY_8259_EDGE_LEVEL_TRIGGERED_REGISTER_SLAVE);
*EdgeLevel = (UINT16) (MasterValue | (SlaveValue << 8));
}
}
//
// Legacy 8259 Protocol Interface Functions
//
/**
Sets the base address for the 8259 master and slave PICs.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] MasterBase Interrupt vectors for IRQ0-IRQ7.
@param[in] SlaveBase Interrupt vectors for IRQ8-IRQ15.
@retval EFI_SUCCESS The 8259 PIC was programmed successfully.
@retval EFI_DEVICE_ERROR There was an error while writing to the 8259 PIC.
**/
EFI_STATUS
EFIAPI
Interrupt8259SetVectorBase (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN UINT8 MasterBase,
IN UINT8 SlaveBase
)
{
UINT8 Mask;
EFI_TPL OriginalTpl;
OriginalTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
//
// Set vector base for slave PIC
//
if (SlaveBase != mSlaveBase) {
mSlaveBase = SlaveBase;
//
// Initialization sequence is needed for setting vector base.
//
//
// Preserve interrtup mask register before initialization sequence
// because it will be cleared during initialization
//
Mask = IoRead8 (LEGACY_8259_MASK_REGISTER_SLAVE);
//
// ICW1: cascade mode, ICW4 write required
//
IoWrite8 (LEGACY_8259_CONTROL_REGISTER_SLAVE, 0x11);
//
// ICW2: new vector base (must be multiple of 8)
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_SLAVE, mSlaveBase);
//
// ICW3: slave indentification code must be 2
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_SLAVE, 0x02);
//
// ICW4: fully nested mode, non-buffered mode, normal EOI, IA processor
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_SLAVE, 0x01);
//
// Restore interrupt mask register
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_SLAVE, Mask);
}
//
// Set vector base for master PIC
//
if (MasterBase != mMasterBase) {
mMasterBase = MasterBase;
//
// Initialization sequence is needed for setting vector base.
//
//
// Preserve interrtup mask register before initialization sequence
// because it will be cleared during initialization
//
Mask = IoRead8 (LEGACY_8259_MASK_REGISTER_MASTER);
//
// ICW1: cascade mode, ICW4 write required
//
IoWrite8 (LEGACY_8259_CONTROL_REGISTER_MASTER, 0x11);
//
// ICW2: new vector base (must be multiple of 8)
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_MASTER, mMasterBase);
//
// ICW3: slave PIC is cascaded on IRQ2
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_MASTER, 0x04);
//
// ICW4: fully nested mode, non-buffered mode, normal EOI, IA processor
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_MASTER, 0x01);
//
// Restore interrupt mask register
//
IoWrite8 (LEGACY_8259_MASK_REGISTER_MASTER, Mask);
}
IoWrite8 (LEGACY_8259_CONTROL_REGISTER_SLAVE, LEGACY_8259_EOI);
IoWrite8 (LEGACY_8259_CONTROL_REGISTER_MASTER, LEGACY_8259_EOI);
gBS->RestoreTPL (OriginalTpl);
return EFI_SUCCESS;
}
/**
Gets the current 16-bit real mode and 32-bit protected-mode IRQ masks.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[out] LegacyMask 16-bit mode interrupt mask for IRQ0-IRQ15.
@param[out] LegacyEdgeLevel 16-bit mode edge/level mask for IRQ-IRQ15.
@param[out] ProtectedMask 32-bit mode interrupt mask for IRQ0-IRQ15.
@param[out] ProtectedEdgeLevel 32-bit mode edge/level mask for IRQ0-IRQ15.
@retval EFI_SUCCESS The 8259 PIC was programmed successfully.
@retval EFI_DEVICE_ERROR There was an error while reading the 8259 PIC.
**/
EFI_STATUS
EFIAPI
Interrupt8259GetMask (
IN EFI_LEGACY_8259_PROTOCOL *This,
OUT UINT16 *LegacyMask, OPTIONAL
OUT UINT16 *LegacyEdgeLevel, OPTIONAL
OUT UINT16 *ProtectedMask, OPTIONAL
OUT UINT16 *ProtectedEdgeLevel OPTIONAL
)
{
if (LegacyMask != NULL) {
*LegacyMask = mLegacyModeMask;
}
if (LegacyEdgeLevel != NULL) {
*LegacyEdgeLevel = mLegacyModeEdgeLevel;
}
if (ProtectedMask != NULL) {
*ProtectedMask = mProtectedModeMask;
}
if (ProtectedEdgeLevel != NULL) {
*ProtectedEdgeLevel = mProtectedModeEdgeLevel;
}
return EFI_SUCCESS;
}
/**
Sets the current 16-bit real mode and 32-bit protected-mode IRQ masks.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] LegacyMask 16-bit mode interrupt mask for IRQ0-IRQ15.
@param[in] LegacyEdgeLevel 16-bit mode edge/level mask for IRQ-IRQ15.
@param[in] ProtectedMask 32-bit mode interrupt mask for IRQ0-IRQ15.
@param[in] ProtectedEdgeLevel 32-bit mode edge/level mask for IRQ0-IRQ15.
@retval EFI_SUCCESS The 8259 PIC was programmed successfully.
@retval EFI_DEVICE_ERROR There was an error while writing the 8259 PIC.
**/
EFI_STATUS
EFIAPI
Interrupt8259SetMask (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN UINT16 *LegacyMask, OPTIONAL
IN UINT16 *LegacyEdgeLevel, OPTIONAL
IN UINT16 *ProtectedMask, OPTIONAL
IN UINT16 *ProtectedEdgeLevel OPTIONAL
)
{
if (LegacyMask != NULL) {
mLegacyModeMask = *LegacyMask;
}
if (LegacyEdgeLevel != NULL) {
mLegacyModeEdgeLevel = *LegacyEdgeLevel;
}
if (ProtectedMask != NULL) {
mProtectedModeMask = *ProtectedMask;
}
if (ProtectedEdgeLevel != NULL) {
mProtectedModeEdgeLevel = *ProtectedEdgeLevel;
}
return EFI_SUCCESS;
}
/**
Sets the mode of the PICs.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] Mode 16-bit real or 32-bit protected mode.
@param[in] Mask The value with which to set the interrupt mask.
@param[in] EdgeLevel The value with which to set the edge/level mask.
@retval EFI_SUCCESS The mode was set successfully.
@retval EFI_INVALID_PARAMETER The mode was not set.
**/
EFI_STATUS
EFIAPI
Interrupt8259SetMode (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN EFI_8259_MODE Mode,
IN UINT16 *Mask, OPTIONAL
IN UINT16 *EdgeLevel OPTIONAL
)
{
if (Mode == mMode) {
return EFI_SUCCESS;
}
if (Mode == Efi8259LegacyMode) {
//
// In Efi8259ProtectedMode, mask and edge/level trigger registers should
// be changed through this protocol, so we can track them in the
// corresponding module variables.
//
Interrupt8259ReadMask (&mProtectedModeMask, &mProtectedModeEdgeLevel);
if (Mask != NULL) {
//
// Update the Mask for the new mode
//
mLegacyModeMask = *Mask;
}
if (EdgeLevel != NULL) {
//
// Update the Edge/Level triggered mask for the new mode
//
mLegacyModeEdgeLevel = *EdgeLevel;
}
mMode = Mode;
//
// Write new legacy mode mask/trigger level
//
Interrupt8259WriteMask (mLegacyModeMask, mLegacyModeEdgeLevel);
return EFI_SUCCESS;
}
if (Mode == Efi8259ProtectedMode) {
//
// Save the legacy mode mask/trigger level
//
Interrupt8259ReadMask (&mLegacyModeMask, &mLegacyModeEdgeLevel);
//
// Always force Timer to be enabled after return from 16-bit code.
// This always insures that on next entry, timer is counting.
//
mLegacyModeMask &= 0xFFFE;
if (Mask != NULL) {
//
// Update the Mask for the new mode
//
mProtectedModeMask = *Mask;
}
if (EdgeLevel != NULL) {
//
// Update the Edge/Level triggered mask for the new mode
//
mProtectedModeEdgeLevel = *EdgeLevel;
}
mMode = Mode;
//
// Write new protected mode mask/trigger level
//
Interrupt8259WriteMask (mProtectedModeMask, mProtectedModeEdgeLevel);
return EFI_SUCCESS;
}
return EFI_INVALID_PARAMETER;
}
/**
Translates the IRQ into a vector.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] Irq IRQ0-IRQ15.
@param[out] Vector The vector that is assigned to the IRQ.
@retval EFI_SUCCESS The Vector that matches Irq was returned.
@retval EFI_INVALID_PARAMETER Irq is not valid.
**/
EFI_STATUS
EFIAPI
Interrupt8259GetVector (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN EFI_8259_IRQ Irq,
OUT UINT8 *Vector
)
{
if ((UINT32)Irq > Efi8259Irq15) {
return EFI_INVALID_PARAMETER;
}
if (Irq <= Efi8259Irq7) {
*Vector = (UINT8) (mMasterBase + Irq);
} else {
*Vector = (UINT8) (mSlaveBase + (Irq - Efi8259Irq8));
}
return EFI_SUCCESS;
}
/**
Enables the specified IRQ.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] Irq IRQ0-IRQ15.
@param[in] LevelTriggered 0 = Edge triggered; 1 = Level triggered.
@retval EFI_SUCCESS The Irq was enabled on the 8259 PIC.
@retval EFI_INVALID_PARAMETER The Irq is not valid.
**/
EFI_STATUS
EFIAPI
Interrupt8259EnableIrq (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN EFI_8259_IRQ Irq,
IN BOOLEAN LevelTriggered
)
{
if ((UINT32)Irq > Efi8259Irq15) {
return EFI_INVALID_PARAMETER;
}
mProtectedModeMask = (UINT16) (mProtectedModeMask & ~(1 << Irq));
if (LevelTriggered) {
mProtectedModeEdgeLevel = (UINT16) (mProtectedModeEdgeLevel | (1 << Irq));
} else {
mProtectedModeEdgeLevel = (UINT16) (mProtectedModeEdgeLevel & ~(1 << Irq));
}
Interrupt8259WriteMask (mProtectedModeMask, mProtectedModeEdgeLevel);
return EFI_SUCCESS;
}
/**
Disables the specified IRQ.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] Irq IRQ0-IRQ15.
@retval EFI_SUCCESS The Irq was disabled on the 8259 PIC.
@retval EFI_INVALID_PARAMETER The Irq is not valid.
**/
EFI_STATUS
EFIAPI
Interrupt8259DisableIrq (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN EFI_8259_IRQ Irq
)
{
if ((UINT32)Irq > Efi8259Irq15) {
return EFI_INVALID_PARAMETER;
}
mProtectedModeMask = (UINT16) (mProtectedModeMask | (1 << Irq));
mProtectedModeEdgeLevel = (UINT16) (mProtectedModeEdgeLevel & ~(1 << Irq));
Interrupt8259WriteMask (mProtectedModeMask, mProtectedModeEdgeLevel);
return EFI_SUCCESS;
}
/**
Reads the PCI configuration space to get the interrupt number that is assigned to the card.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] PciHandle PCI function for which to return the vector.
@param[out] Vector IRQ number that corresponds to the interrupt line.
@retval EFI_SUCCESS The interrupt line value was read successfully.
**/
EFI_STATUS
EFIAPI
Interrupt8259GetInterruptLine (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN EFI_HANDLE PciHandle,
OUT UINT8 *Vector
)
{
EFI_PCI_IO_PROTOCOL *PciIo;
UINT8 InterruptLine;
EFI_STATUS Status;
Status = gBS->HandleProtocol (
PciHandle,
&gEfiPciIoProtocolGuid,
(VOID **) &PciIo
);
if (EFI_ERROR (Status)) {
return EFI_INVALID_PARAMETER;
}
PciIo->Pci.Read (
PciIo,
EfiPciIoWidthUint8,
PCI_INT_LINE_OFFSET,
1,
&InterruptLine
);
//
// Interrupt line is same location for standard PCI cards, standard
// bridge and CardBus bridge.
//
*Vector = InterruptLine;
return EFI_SUCCESS;
}
/**
Issues the End of Interrupt (EOI) commands to PICs.
@param[in] This Indicates the EFI_LEGACY_8259_PROTOCOL instance.
@param[in] Irq The interrupt for which to issue the EOI command.
@retval EFI_SUCCESS The EOI command was issued.
@retval EFI_INVALID_PARAMETER The Irq is not valid.
**/
EFI_STATUS
EFIAPI
Interrupt8259EndOfInterrupt (
IN EFI_LEGACY_8259_PROTOCOL *This,
IN EFI_8259_IRQ Irq
)
{
if ((UINT32)Irq > Efi8259Irq15) {
return EFI_INVALID_PARAMETER;
}
if (Irq >= Efi8259Irq8) {
IoWrite8 (LEGACY_8259_CONTROL_REGISTER_SLAVE, LEGACY_8259_EOI);
}
IoWrite8 (LEGACY_8259_CONTROL_REGISTER_MASTER, LEGACY_8259_EOI);
return EFI_SUCCESS;
}
/**
Driver Entry point.
@param[in] ImageHandle ImageHandle of the loaded driver.
@param[in] SystemTable Pointer to the EFI System Table.
@retval EFI_SUCCESS One or more of the drivers returned a success code.
@retval !EFI_SUCCESS Error installing Legacy 8259 Protocol.
**/
EFI_STATUS
EFIAPI
Install8259 (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_8259_IRQ Irq;
//
// Initialze mask values from PCDs
//
mLegacyModeMask = PcdGet16 (Pcd8259LegacyModeMask);
mLegacyModeEdgeLevel = PcdGet16 (Pcd8259LegacyModeEdgeLevel);
//
// Clear all pending interrupt
//
for (Irq = Efi8259Irq0; Irq <= Efi8259Irq15; Irq++) {
Interrupt8259EndOfInterrupt (&mInterrupt8259, Irq);
}
//
// Set the 8259 Master base to 0x68 and the 8259 Slave base to 0x70
//
Status = Interrupt8259SetVectorBase (&mInterrupt8259, PROTECTED_MODE_BASE_VECTOR_MASTER, PROTECTED_MODE_BASE_VECTOR_SLAVE);
//
// Set all 8259 interrupts to edge triggered and disabled
//
Interrupt8259WriteMask (mProtectedModeMask, mProtectedModeEdgeLevel);
//
// Install 8259 Protocol onto a new handle
//
Status = gBS->InstallProtocolInterface (
&m8259Handle,
&gEfiLegacy8259ProtocolGuid,
EFI_NATIVE_INTERFACE,
&mInterrupt8259
);
return Status;
}
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