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/** @file
The VGA Mini Port Protocol used to set the text display mode of a VGA controller.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __VGA_MINI_PORT_H_
#define __VGA_MINI_PORT_H_
///
/// Global ID for the EFI_VGA_MINI_PORT_PROTOCOL.
///
#define EFI_VGA_MINI_PORT_PROTOCOL_GUID \
{ \
0xc7735a2f, 0x88f5, 0x4882, {0xae, 0x63, 0xfa, 0xac, 0x8c, 0x8b, 0x86, 0xb3 } \
}
///
/// Forward declaration for the EFI_VGA_MINI_PORT_PROTOCOL.
///
typedef struct _EFI_VGA_MINI_PORT_PROTOCOL EFI_VGA_MINI_PORT_PROTOCOL;
/**
Sets the text display mode of a VGA controller.
Sets the text display mode of the VGA controller to the mode specified by
ModeNumber. A ModeNumber of 0 is a request for an 80x25 text mode. A
ModeNumber of 1 is a request for an 80x50 text mode. If ModeNumber is greater
than MaxModeNumber, then EFI_UNSUPPORTED is returned. If the VGA controller
is not functioning properly, then EFI_DEVICE_ERROR is returned. If the VGA
controller is successfully set to the mode number specified by ModeNumber, then
EFI_SUCCESS is returned.
@param[in] This A pointer to the EFI_VGA_MINI_PORT_PROTOCOL instance.
@param[in] ModeNumber The requested mode number. 0 for 80x25. 1 for 80x5.
@retval EFI_SUCCESS The mode number was set.
@retval EFI_UNSUPPORTED The mode number specified by ModeNumber is not supported.
@retval EFI_DEVICE_ERROR The device is not functioning properly.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_VGA_MINI_PORT_SET_MODE)(
IN EFI_VGA_MINI_PORT_PROTOCOL *This,
IN UINTN ModeNumber
);
struct _EFI_VGA_MINI_PORT_PROTOCOL {
EFI_VGA_MINI_PORT_SET_MODE SetMode;
///
/// MMIO base address of the VGA text mode framebuffer. Typically set to 0xB8000.
///
UINT64 VgaMemoryOffset;
///
/// I/O Port address for the VGA CRTC address register. Typically set to 0x3D4.
///
UINT64 CrtcAddressRegisterOffset;
///
/// I/O Port address for the VGA CRTC data register. Typically set to 0x3D5.
///
UINT64 CrtcDataRegisterOffset;
///
/// PCI Controller MMIO BAR index of the VGA text mode frame buffer. Typically
/// set to EFI_PCI_IO_PASS_THROUGH_BAR
///
UINT8 VgaMemoryBar;
///
/// PCI Controller I/O BAR index of the VGA CRTC address register. Typically
/// set to EFI_PCI_IO_PASS_THROUGH_BAR
///
UINT8 CrtcAddressRegisterBar;
///
/// PCI Controller I/O BAR index of the VGA CRTC data register. Typically set
/// to EFI_PCI_IO_PASS_THROUGH_BAR
///
UINT8 CrtcDataRegisterBar;
///
/// The maximum number of text modes that this VGA controller supports.
///
UINT8 MaxMode;
};
extern EFI_GUID gEfiVgaMiniPortProtocolGuid;
#endif
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