80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
// Simple framebuffer vgabios for use with qemu bochs-display device
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//
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// Copyright (C) 2019 Gerd Hoffmann <kraxel@redhat.com>
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "biosvar.h" // GET_BDA
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#include "output.h" // dprintf
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#include "string.h" // memset16_far
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#include "bochsvga.h" // VBE_BOCHS_*
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#include "hw/pci.h" // pci_config_readl
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#include "hw/pci_regs.h" // PCI_BASE_ADDRESS_0
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#include "vgabios.h" // SET_VGA
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#include "vgautil.h" // VBE_total_memory
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#define FRAMEBUFFER_WIDTH 1024
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#define FRAMEBUFFER_HEIGHT 768
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#define FRAMEBUFFER_BPP 4
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int
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bochs_display_setup(void)
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{
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dprintf(1, "bochs-display: setup called\n");
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if (GET_GLOBAL(HaveRunInit))
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return 0;
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int bdf = GET_GLOBAL(VgaBDF);
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if (bdf == 0)
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return 0;
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u32 bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_0);
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u32 lfb_addr = bar & PCI_BASE_ADDRESS_MEM_MASK;
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bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_2);
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u32 io_addr = bar & PCI_BASE_ADDRESS_IO_MASK;
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dprintf(1, "bochs-display: bdf %02x:%02x.%x, bar 0 at 0x%x, bar 1 at 0x%x\n"
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, pci_bdf_to_bus(bdf) , pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf),
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lfb_addr, io_addr);
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u16 *dispi = (void*)(io_addr + 0x500);
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u8 *vga = (void*)(io_addr + 0x400);
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u16 id = readw(dispi + VBE_DISPI_INDEX_ID);
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dprintf(1, "bochs-display: id is 0x%x, %s\n", id
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, id == VBE_DISPI_ID5 ? "good" : "FAIL");
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if (id != VBE_DISPI_ID5)
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return -1;
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int i;
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u8 *edid = (void*)(io_addr);
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for (i = 0; i < sizeof(VBE_edid); i++)
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SET_VGA(VBE_edid[i], readb(edid + i));
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int fb_width = FRAMEBUFFER_WIDTH;
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int fb_height = FRAMEBUFFER_HEIGHT;
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if (GET_GLOBAL(VBE_edid[0]) == 0x00 &&
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GET_GLOBAL(VBE_edid[1]) == 0xff) {
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fb_width = GET_GLOBAL(VBE_edid[54 + 2]);
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fb_width |= (GET_GLOBAL(VBE_edid[54 + 4]) & 0xf0) << 4;
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fb_height = GET_GLOBAL(VBE_edid[54 + 5]);
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fb_height |= (GET_GLOBAL(VBE_edid[54 + 7]) & 0xf0) << 4;
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}
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int fb_stride = FRAMEBUFFER_BPP * fb_width;
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dprintf(1, "bochs-display: using %dx%d, %d bpp (%d stride)\n"
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, fb_width, fb_height
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, FRAMEBUFFER_BPP * 8, fb_stride);
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cbvga_setup_modes(lfb_addr, FRAMEBUFFER_BPP * 8,
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fb_width, fb_height, fb_stride);
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writew(dispi + VBE_DISPI_INDEX_XRES, fb_width);
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writew(dispi + VBE_DISPI_INDEX_YRES, fb_height);
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writew(dispi + VBE_DISPI_INDEX_BPP, FRAMEBUFFER_BPP * 8);
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writew(dispi + VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED);
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writeb(vga, 0x20); /* unblank (for qemu -device VGA) */
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return 0;
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}
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