EFI LEGACY 8259 PROTOCOL

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Contents

GUID

#define EFI_LEGACY_8259_PROTOCOL_GUID \
  {0x38321dba, 0x4fe0, 0x4e17, \
  0x8a, 0xec, 0x41, 0x30, 0x55, 0xea, 0xed, 0xc1}

Prototcol Interface Structure

typedef struct _EFI_LEGACY_8259_PROTOCOL {
  EFI_LEGACY_8259_SET_VECTOR_BASE     SetVectorBase;
  EFI_LEGACY_8259_GET_MASK            GetMask;
  EFI_LEGACY_8259_SET_MASK            SetMask;
  EFI_LEGACY_8259_SET_MODE            SetMode;
  EFI_LEGACY_8259_GET_VECTOR          GetVector;
  EFI_LEGACY_8259_ENABLE_IRQ          EnableIrq;
  EFI_LEGACY_8259_DISABLE_IRQ         DisableIrq;
  EFI_LEGACY_8259_GET_INTERRUPT_LINE  GetInterruptLine;
  EFI_LEGACY_8259_END_OF_INTERRUPT    EndOfInterrupt;
} EFI_LEGACY_8259_PROTOCOL;

SetVectorBase

Set the base address for the 8259 master and slave PICs.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_SET_VECTOR_BASE) (
  IN EFI_LEGACY_8259_PROTOCOL           * This,
  IN UINT8                             MasterBase,
  IN  UINT8                             SlaveBase
  );

Parameters

Parameter Description
This Protocol instance pointer.
MasterBase The base vector for the Master PIC in the 8259 controller (IRQ0-IRQ7)
Slavebase The base vector for the Master PIC in the 8259 controller (IRQ8-IRQ15)

Description
Get the 8259 interrupt base for the master and slave interrupt controller.


Status Codes Returned

Status Code Description
EFI_SUCCESS The 8259 PIC was programmed successfully.
EFI_DEVICE_ERROR There was an error while writing to the 8259 PIC.

GetMask()

Get the 16-bit real mode and 32/64-bit protected mode IRQ masks.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_GET_MASK) (
  IN  EFI_LEGACY_8259_PROTOCOL           * This,
  OUT UINT16                            *LegacyMask, OPTIONAL
  OUT UINT16                            *LegacyEdgeLevel, OPTIONAL
  OUT UINT16                            *ProtectedMask, OPTIONAL
  OUT UINT16                            *ProtectedEdgeLevel OPTIONAL
  );

Parameters

Parameter Description
This Protocol instance pointer.
LegacyMask 16-bit real-mode interrupt mask. Bit 0 is Irq0 - Bit 15 is Irq15
LegacyEdgeLevel 16-bit real-mode edge/level mask. Bit 0 is Irq0 - Bit 15 is Irq15
ProtectedMask 32/64-bit protected-mode interrput mask. Bit 0 is Irq0 - Bit 15 is Irq15
ProtectedEdgeLevel 32/64-bit protected-mode edge/level mask. Bit 0 is Irq0 - Bit 15 is Irq15

Description
Get the 8259 interrupt masks for Irq0 - Irq15. A different mask exists for the legacy mode mask and the protected mode mask. The base address for the 8259 is different for legacy and protected mode, so two masks are required.

Status Codes Returned

Status Code Description
EFI_SUCCESS The 8259 PIC information was returned successfully.
EFI_DEVICE_ERROR There was an error while reading the 8259 PIC.

SetMask()

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_SET_MASK) (
  IN EFI_LEGACY_8259_PROTOCOL           * This,
  IN UINT16                            *LegacyMask, OPTIONAL
  IN UINT16                            *LegacyEdgeLevel, OPTIONAL
  IN UINT16                            *ProtectedMask, OPTIONAL
  IN UINT16                            *ProtectedEdgeLevel OPTIONAL
  );

Description
Set the 8259 interrupt masks for Irq0 - Irq15. A different mask exists for the legacy mode mask and the protected mode mask. The base address for the 8259 is different for legacy and protected mode, so two masks are required. Also set the edge/level masks.

Parameters

Parameter Description
This Protocol instance pointer.
LegacyMask Bit 0 is Irq0 - Bit 15 is Irq15
LegacyEdgeLevel Bit 0 is Irq0 - Bit 15 is Irq15
ProtectedMask Bit 0 is Irq0 - Bit 15 is Irq15
ProtectedEdgeLevel Bit 0 is Irq0 - Bit 15 is Irq15

Status Codes Returned

Status Code Description
EFI_SUCCESS 8259 status returned
EFI_DEVICE_ERROR Error reading 8259

SetMode()

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_SET_MODE) (
  IN EFI_LEGACY_8259_PROTOCOL         * This,
  IN EFI_8259_MODE                   Mode,
  IN UINT16                          *Mask, OPTIONAL
  IN UINT16                          *EdgeLevel OPTIONAL
  );

Description
Set the 8259 mode of operation. The base address for the 8259 is different for legacy and protected mode. The legacy mode requires the master 8259 to have a master base of 0x08 and the slave base of 0x70. The protected mode base locations are not defined. Interrupts must be masked by the caller before this function is called. The interrupt mask from the current mode is saved. The interrupt mask for the new mode is Mask, or if Mask does not exist the previously saved mask is used.


Parameters

Parameter Description
This Protocol instance pointer.
Mode Mode of operation. i.e. real mode or protected mode
Mask Optional interupt mask for the new mode.
EdgeLevel Optional trigger mask for the new mode.

Status Codes Returned

Status Code Description
EFI_SUCCESS 8259 programmed
EFI_DEVICE_ERROR Error writing to 8259

GetVector()

Prototype

typedef 
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_GET_VECTOR) (
  IN  EFI_LEGACY_8259_PROTOCOL           * This,
  IN  EFI_8259_IRQ                      Irq,
  OUT UINT8                             *Vector
  );

Description
Convert from IRQ to processor interrupt vector number.

Parameters

Parameter Description
This Protocol instance pointer.
Irq 8259 IRQ0 - IRQ15
Vector Processor vector number that matches Irq


Status Codes Returned

Status Code Description
EFI_SUCCESS The Vector matching Irq is returned
EFI_INVALID_PARAMETER Irq not valid

EnableIrq()

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_ENABLE_IRQ) (
  IN EFI_LEGACY_8259_PROTOCOL           * This,
  IN EFI_8259_IRQ                      Irq,
  IN BOOLEAN                           LevelTriggered
  );

Description
Enable Irq by unmasking interrupt in 8259

Parameters

Parameter Description
This Protocol instance pointer.
Irq 8259 IRQ0 - IRQ15
LevelTriggered TRUE if level triggered. FALSE if edge triggered.

Status Codes Returned

Status Code Description
EFI_SUCCESS Irq enabled on 8259
EFI_INVALID_PARAMETER Irq not valid

DisableIrq()

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_DISABLE_IRQ) (
  IN EFI_LEGACY_8259_PROTOCOL           * This,
  IN EFI_8259_IRQ                      Irq
  );

Description
Disable Irq by masking interrupt in 8259

Parameters

Parameter Description
This Protocol instance pointer.
Irq 8259 IRQ0 - IRQ15

Status Codes Returned

Status Code Description
EFI_SUCCESS Irq disabled on 8259
EFI_INVALID_PARAMETER Irq not valid

GetInterruptLine()

Reads the PCI configuration space to get the interrupt line assigned to a PCI device.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_GET_INTERRUPT_LINE) (
  IN  EFI_LEGACY_8259_PROTOCOL           * This,
  IN  EFI_HANDLE                        PciHandle,
  OUT UINT8                             *Vector
  );

Description
This function reads the PCI configuration space to get the interrupt number that is assigned to the PCI device. PciHandle represents a PCI config space of a PCI function. Vector represents Interrupt Pin (from PCI config space) and it is the data that is programmed into the Interrupt Line (from the PCI config space) register.


Parameters

Parameter Description
This Protocol instance pointer.
PciHandle PCI function to return vector for
Vector Vector for fucntion that matches

'Status Codes Returned

Status Code Description
EFI_SUCCESS A valid Vector is returned
EFI_INVALID_PARAMETER PciHandle not valid

EndOfInterrupt()

Issue End-Of-Interrupt to the PICs.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_8259_END_OF_INTERRUPT) (
  IN EFI_LEGACY_8259_PROTOCOL          *This,
  IN EFI_8259_IRQ                      Irq
  );

Description
Send an EOI to 8259

Parameters

Parameter Description
This Protocol instance pointer.
Irq 8259 IRQ0 - IRQ15

Status Codes Returned

Status Code Description
EFI_SUCCESS EOI successfully sent to 8259
EFI_INVALID_PARAMETER Irq not valid

Copyright (C) 2008 Phoenix Technologies Ltd. All Rights Reserved. Portions (C) 1999-2006 Intel Corporation. Used with permission.

Retrieved from "http://wiki.phoenix.com/wiki/index.php/EFI_LEGACY_8259_PROTOCOL"
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