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https://github.com/brain-hackers/u-boot-brain
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6854f87cbc
Some platforms don't have native code for dealing with their video hardware. In some cases they use a binary blob to set it up and perform required actions like setting the video mode. This approach is a hangover from the old PC days where a ROM was provided and executed during startup. Even now, these ROMs are supplied as a way to set up video. It avoids the code for every video chip needing to be provided in the boot loader. But it makes the video much less flexible - e.g. it is not possible to do anything else while the video init is happening (including waiting hundreds of milliseconds for display panels to start up). In any case, to deal with this sad state of affairs, provide an API for execution of x86 video ROMs, either natively or through emulation. Signed-off-by: Simon Glass <sjg@chromium.org>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Copyright (C) 1996-1999 SciTech Software, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#ifndef _BIOS_EMUL_H
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#define _BIOS_EMUL_H
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/* Include the register header directly here */
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#include "../drivers/bios_emulator/include/x86emu/regs.h"
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#include <pci.h>
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/****************************************************************************
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REMARKS:
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Data structure used to describe the details for the BIOS emulator system
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environment as used by the X86 emulator library.
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HEADER:
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biosemu.h
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MEMBERS:
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vgaInfo - VGA BIOS information structure
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biosmem_base - Base of the BIOS image
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biosmem_limit - Limit of the BIOS image
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busmem_base - Base of the VGA bus memory
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****************************************************************************/
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typedef struct {
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int function;
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int device;
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int bus;
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u32 VendorID;
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u32 DeviceID;
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pci_dev_t pcidev;
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void *BIOSImage;
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u32 BIOSImageLen;
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u8 LowMem[1536];
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} BE_VGAInfo;
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struct vbe_mode_info;
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int BootVideoCardBIOS(pci_dev_t pcidev, BE_VGAInfo **pVGAInfo, int cleanUp);
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/* Run a BIOS ROM natively (only supported on x86 machines) */
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void bios_run_on_x86(pci_dev_t pcidev, unsigned long addr, int vesa_mode,
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struct vbe_mode_info *mode_info);
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/**
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* bios_set_interrupt_handler() - Install an interrupt handler for the BIOS
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*
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* This installs an interrupt handler that the BIOS will call when needed.
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*
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* @intnum: Interrupt number to install a handler for
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* @int_handler_func: Function to call to handle interrupt
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*/
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void bios_set_interrupt_handler(int intnum, int (*int_handler_func)(void));
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#endif
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