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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f462ed939d
The majority of the DMI checks in efifb are for cases where the bootloader has provided invalid information. However, on some machines the overrides may do more harm than good due to configuration differences between machines with the same machine identifier. It turns out that it's possible for the bootloader to get the correct information on GOP-based systems, but we can't guarantee that the kernel's being booted with one that's been updated to do so. Add support for a capabilities flag that can be set by the bootloader, and skip the DMI checks in that case. Additionally, set this flag in the UEFI stub code. Signed-off-by: Matthew Garrett <mjg@redhat.com> Acked-by: Peter Jones <pjones@redhat.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
#ifndef _SCREEN_INFO_H
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#define _SCREEN_INFO_H
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#include <linux/types.h>
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/*
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* These are set up by the setup-routine at boot-time:
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*/
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struct screen_info {
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__u8 orig_x; /* 0x00 */
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__u8 orig_y; /* 0x01 */
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__u16 ext_mem_k; /* 0x02 */
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__u16 orig_video_page; /* 0x04 */
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__u8 orig_video_mode; /* 0x06 */
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__u8 orig_video_cols; /* 0x07 */
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__u8 flags; /* 0x08 */
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__u8 unused2; /* 0x09 */
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__u16 orig_video_ega_bx;/* 0x0a */
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__u16 unused3; /* 0x0c */
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__u8 orig_video_lines; /* 0x0e */
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__u8 orig_video_isVGA; /* 0x0f */
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__u16 orig_video_points;/* 0x10 */
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/* VESA graphic mode -- linear frame buffer */
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__u16 lfb_width; /* 0x12 */
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__u16 lfb_height; /* 0x14 */
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__u16 lfb_depth; /* 0x16 */
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__u32 lfb_base; /* 0x18 */
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__u32 lfb_size; /* 0x1c */
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__u16 cl_magic, cl_offset; /* 0x20 */
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__u16 lfb_linelength; /* 0x24 */
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__u8 red_size; /* 0x26 */
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__u8 red_pos; /* 0x27 */
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__u8 green_size; /* 0x28 */
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__u8 green_pos; /* 0x29 */
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__u8 blue_size; /* 0x2a */
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__u8 blue_pos; /* 0x2b */
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__u8 rsvd_size; /* 0x2c */
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__u8 rsvd_pos; /* 0x2d */
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__u16 vesapm_seg; /* 0x2e */
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__u16 vesapm_off; /* 0x30 */
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__u16 pages; /* 0x32 */
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__u16 vesa_attributes; /* 0x34 */
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__u32 capabilities; /* 0x36 */
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__u8 _reserved[6]; /* 0x3a */
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} __attribute__((packed));
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#define VIDEO_TYPE_MDA 0x10 /* Monochrome Text Display */
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#define VIDEO_TYPE_CGA 0x11 /* CGA Display */
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#define VIDEO_TYPE_EGAM 0x20 /* EGA/VGA in Monochrome Mode */
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#define VIDEO_TYPE_EGAC 0x21 /* EGA in Color Mode */
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#define VIDEO_TYPE_VGAC 0x22 /* VGA+ in Color Mode */
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#define VIDEO_TYPE_VLFB 0x23 /* VESA VGA in graphic mode */
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#define VIDEO_TYPE_PICA_S3 0x30 /* ACER PICA-61 local S3 video */
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#define VIDEO_TYPE_MIPS_G364 0x31 /* MIPS Magnum 4000 G364 video */
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#define VIDEO_TYPE_SGI 0x33 /* Various SGI graphics hardware */
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#define VIDEO_TYPE_TGAC 0x40 /* DEC TGA */
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#define VIDEO_TYPE_SUN 0x50 /* Sun frame buffer. */
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#define VIDEO_TYPE_SUNPCI 0x51 /* Sun PCI based frame buffer. */
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#define VIDEO_TYPE_PMAC 0x60 /* PowerMacintosh frame buffer. */
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#define VIDEO_TYPE_EFI 0x70 /* EFI graphic mode */
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#define VIDEO_FLAGS_NOCURSOR (1 << 0) /* The video mode has no cursor set */
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#define VIDEO_CAPABILITY_SKIP_QUIRKS (1 << 0)
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#ifdef __KERNEL__
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extern struct screen_info screen_info;
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#define ORIG_X (screen_info.orig_x)
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#define ORIG_Y (screen_info.orig_y)
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#define ORIG_VIDEO_MODE (screen_info.orig_video_mode)
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#define ORIG_VIDEO_COLS (screen_info.orig_video_cols)
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#define ORIG_VIDEO_EGA_BX (screen_info.orig_video_ega_bx)
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#define ORIG_VIDEO_LINES (screen_info.orig_video_lines)
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#define ORIG_VIDEO_ISVGA (screen_info.orig_video_isVGA)
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#define ORIG_VIDEO_POINTS (screen_info.orig_video_points)
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#endif /* __KERNEL__ */
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#endif /* _SCREEN_INFO_H */
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