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kexts: fbcon: implement VGA text mode tty driver

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This commit is contained in:
max 🍓
2023-06-11 09:24:22 +01:00
parent abe4af093e
commit d10c89544c
4 changed files with 54 additions and 34 deletions
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24
kexts/drivers/video/qemufb/main.c
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@@ -62,6 +62,30 @@ static kern_status_t qemufb_probe(struct pci_driver *driver, struct device *dev)
fb->fb_ops = &qemufb_ops;
uint32_t mmio_base = pci_device_read_field(dev, PCI_REG_BAR2, 4);
uint16_t *mmio = vm_phys_to_virt(mmio_base);
struct framebuffer_varinfo *varinfo = &fb->fb_varinfo;
struct framebuffer_fixedinfo *fixedinfo = &fb->fb_fixedinfo;
varinfo->fb_flags = FB_MODE_RGB;
varinfo->fb_xres = mmio[dispi_mmio_offset(VBE_DISPI_INDEX_XRES)];
varinfo->fb_yres = mmio[dispi_mmio_offset(VBE_DISPI_INDEX_YRES)];
varinfo->fb_bpp = mmio[dispi_mmio_offset(VBE_DISPI_INDEX_BPP)];
fixedinfo->fb_baseptr = pci_device_read_field(dev, PCI_REG_BAR0, 4);
if (!varinfo->fb_xres) {
/* no mode data. assume that we're in VGA text mode */
varinfo->fb_xres = 640;
varinfo->fb_yres = 400;
varinfo->fb_bpp = 16;
varinfo->fb_flags = FB_MODE_VGATEXT;
varinfo->fb_xcells = 80;
varinfo->fb_ycells = 25;
varinfo->fb_stride = 80 * 25 * 2;
fixedinfo->fb_baseptr = 0xb8000;
}
return device_register(dev, pci_driver_base(qemufb_driver), NULL);
}