ae2ee627dc
The EFI Graphics Output Protocol uses 64-bit frame buffer addresses but these get truncated to 32-bit by the EFI boot stub when storing the address in the 'lfb_base' field of 'struct screen_info'. Add a 'ext_lfb_base' field for the upper 32-bits of the frame buffer address and set VIDEO_TYPE_CAPABILITY_64BIT_BASE when the field is useable. It turns out that the reason no one has required this support so far is that there's actually code in tianocore to "downgrade" PCI resources that have option ROMs and 64-bit BARS from 64-bit to 32-bit to cope with legacy option ROMs that can't handle 64-bit addresses. The upshot is that basically all GOP devices in the wild use a 32-bit frame buffer address. Still, it is possible to build firmware that uses a full 64-bit GOP frame buffer address. Chad did, which led to him reporting this issue. Add support in anticipation of GOP devices using 64-bit addresses more widely, and so that efifb works out of the box when that happens. Reported-by: Chad Page <chad.page@znyx.com> Cc: Pete Hawkins <pete.hawkins@znyx.com> Acked-by: Peter Jones <pjones@redhat.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
#ifndef _UAPI_SCREEN_INFO_H
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#define _UAPI_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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__u32 ext_lfb_base; /* 0x3a */
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__u8 _reserved[2]; /* 0x3e */
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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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#define VIDEO_CAPABILITY_64BIT_BASE (1 << 1) /* Frame buffer base is 64-bit */
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#endif /* _UAPI_SCREEN_INFO_H */
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