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