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// Hooks for via vgabios calls into main bios.
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#include "bregs.h" // set_code_invalid
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#include "biosvar.h" // GET_GLOBAL
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#include "pci.h" // pci_find_device
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#include "pci_regs.h" // PCI_VENDOR_ID
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#include "pci_ids.h" // PCI_VENDOR_ID_VIA
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#include "util.h" // handle_155f
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#include "config.h" // CONFIG_*
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// The Bus/Dev/Fn of the primary VGA device.
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int VGAbdf VAR16VISIBLE;
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// Coreboot board detected.
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int CBmainboard VAR16VISIBLE;
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handle_155fXX(struct bregs *regs)
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set_code_unimplemented(regs, RET_EUNSUPPORTED);
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/****************************************************************
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****************************************************************/
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via_155f01(struct bregs *regs)
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regs->cl = 2; // panel type = 2 = 1024 * 768
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dprintf(1, "Warning: VGA panel type is hardcoded\n");
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via_155f02(struct bregs *regs)
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regs->cx = 0x401; // PAL + crt only
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regs->dx = 0; // TV Layout - default
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dprintf(1, "Warning: VGA TV/CRT output type is hardcoded\n");
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u8 reg = pci_config_readb(bdf, 0xa1);
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static u8 mem_power[] VAR16 = {0, 3, 4, 5, 6, 7, 8, 9};
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return GET_GLOBAL(mem_power[(reg >> 4) & 0x7]);
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getViaRamSpeed(u16 bdf)
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return (pci_config_readb(bdf, 0x90) & 0x07) + 3;
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int bdf = pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MEMCTL);
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/* mem clk 0 = DDR2 400 */
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return (pci_config_readb(bdf, 0x94) & 0x7) + 6;
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ECX = unknown/dont care
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EBX[3..0] Frame Buffer Size 2^N MiB
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EBX[7..4] Memory speed:
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3: DDR 100Mhz (PC1600 or DDR200)
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4: DDR 133Mhz (PC2100 or DDR266)
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5: DDR 166Mhz (PC2700 or DDR333)
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6: DDR 200Mhz (PC3200 or DDR400)
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7: DDR2 133Mhz (DDR2 533)
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8: DDR2 166Mhz (DDR2 667)
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9: DDR2 200Mhz (DDR2 800)
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A: DDR2 233Mhz (DDR2 1066)
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EBX[?..8] Total memory size?
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EAX = 0x5f for success
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#define PCI_DEVICE_ID_VIA_K8M890CE_3 0x3336
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#define PCI_DEVICE_ID_VIA_VX855_MEMCTRL 0x3409
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via_155f18(struct bregs *regs)
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int ramspeed, fbsize;
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int bdf = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_K8M890CE_3);
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fbsize = getFBSize(bdf);
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ramspeed = getAMDRamSpeed();
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bdf = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855_MEMCTRL);
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fbsize = getFBSize(bdf);
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ramspeed = getViaRamSpeed(bdf);
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dprintf(1, "Warning: VGA memory size and speed is hardcoded\n");
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fbsize = 5; // 32M frame buffer
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ramspeed = 4; // MCLK = DDR266
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if (fbsize < 0 || ramspeed < 0) {
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set_code_invalid(regs, RET_EUNSUPPORTED);
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regs->ebx = 0x500 | (ramspeed << 4) | fbsize;
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via_155f19(struct bregs *regs)
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set_invalid_silent(regs);
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via_155f(struct bregs *regs)
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case 0x01: via_155f01(regs); break;
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case 0x02: via_155f02(regs); break;
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case 0x18: via_155f18(regs); break;
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case 0x19: via_155f19(regs); break;
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default: handle_155fXX(regs); break;
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/****************************************************************
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****************************************************************/
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// Main 16bit entry point
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handle_155f(struct bregs *regs)
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if (! CONFIG_VGAHOOKS)
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// XXX - Use this value later.
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//int cbmb = GET_GLOBAL(CBmainboard);
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int bdf = GET_GLOBAL(VGAbdf);
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u16 vendor = pci_config_readw(bdf, PCI_VENDOR_ID);
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if (vendor == PCI_VENDOR_ID_VIA) {
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vgahook_setup(const char *vendor, const char *part)
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if (! CONFIG_VGAHOOKS)
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// XXX - add support later.