c0f45e0b7f
BIOS execution is provided through the `v8086` module, which provides software emulation of an 8086 processor. It is not currently working with some BIOSes and may (read: probably will be) replaced with another emulator (x86emu comes to mind) at some point in the near future. In the meantime, the default video mode for QEMU works with this and it's enough to get us on real VESA instead of fake VBE. The `bochs` module will be renamed in a future commit. Userspace programs have been adjusted to work at bitrates other than 32 *POORLY*. If you write pixels left-to-right, they should work fine. They only work with 24-bpp otherwise, and then you need to be careful of what pixels you are writing when, or you will overwrite things in other pixels. You may pass a commandline argument like the following to set display modes: vid=vesa,1024,768 Or for stranger modes under QEMU or Bochs, use the bochs VBE initializer: vid=bochs,1280,720 Note that the address of the linear framebuffer is still found via hackish probing instead of PCI or trusting the VBE information, so if you have things in the wrong memory ranges (0xE0000000+), be prepared to have them get read. Once again, this entire commit is a massive hack. I am happy that it worked, and I will continue to make it less hacky, but in the meantime, this is what we've got. Happy holidays.
46 lines
978 B
C
46 lines
978 B
C
#ifndef VESA_H
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#define VESA_H
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#include <types.h>
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typedef struct {
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uint16_t Offset;
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uint16_t Segment;
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} t_farptr;
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struct VesaControllerInfo {
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char Signature[4]; // == "VBE2"
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uint16_t Version; // == 0x0300 for Vesa 3.0
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t_farptr OemString; // isa vbeFarPtr
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uint8_t Capabilities[4];
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t_farptr Videomodes; // isa vbeParPtr
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uint16_t TotalMemory;// as # of 64KB blocks
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};
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struct VesaModeInfo {
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uint16_t attributes;
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uint8_t winA, winB;
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uint16_t granularity;
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uint16_t winsize;
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uint16_t segmentA, segmentB;
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t_farptr realFctPtr;
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uint16_t pitch; // bytes per scanline
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uint16_t Xres, Yres;
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uint8_t Wchar, Ychar, planes, bpp, banks;
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uint8_t memory_model, bank_size, image_pages;
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uint8_t reserved0;
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uint8_t red_mask, red_position;
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uint8_t green_mask, green_position;
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uint8_t blue_mask, blue_position;
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uint8_t rsv_mask, rsv_position;
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uint8_t directcolor_attributes;
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uint32_t physbase; // your LFB address ;)
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uint32_t reserved1;
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uint16_t reserved2;
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};
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#endif
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