133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
// Hooks for via vgabios calls into main bios.
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//
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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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 "bregs.h" // set_code_fail
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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_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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static void
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handle_155f01(struct bregs *regs)
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{
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regs->eax = 0x5f;
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regs->cl = 2; // panel type = 2 = 1024 * 768
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set_success(regs);
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dprintf(1, "Warning: VGA panel type is hardcoded\n");
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}
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static void
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handle_155f02(struct bregs *regs)
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{
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regs->eax = 0x5f;
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regs->bx = 2;
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regs->cx = 0x401; // PAL + crt only
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regs->dx = 0; // TV Layout - default
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set_success(regs);
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dprintf(1, "Warning: VGA TV/CRT output type is hardcoded\n");
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}
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static int
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getFBSize()
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{
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/* Find K8M890 */
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int bdf = pci_find_device(PCI_VENDOR_ID_VIA, 0x3336);
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if (bdf < 0)
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goto err;
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/* FB config */
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u8 reg = pci_config_readb(bdf, 0xa1);
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/* GFX disabled ? */
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if (!(reg & 0x80))
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goto err;
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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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err:
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dprintf(1, "Warning: VGA memory size is hardcoded\n");
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return 5; // 32M frame buffer
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}
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static int
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getRamSpeed()
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{
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int bdf = pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MEMCTL);
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if (bdf < 0)
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goto err;
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/* mem clk 0 = DDR2 400 */
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u8 reg = pci_config_readb(bdf, 0x94) & 0x7;
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return reg + 6;
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err:
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dprintf(1, "Warning: VGA memory clock speed is hardcoded\n");
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return 4; // MCLK = DDR266
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}
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/* int 0x15 - 5f18
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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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0: SDR 66Mhz
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1: SDR 100Mhz
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2: SDR 133Mhz
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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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B: and above: Unknown
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EBX[?..8] Total memory size?
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EAX = 0x5f for success
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K8M890 BIOS wants only this call (Desktop NoTv)
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*/
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static void
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handle_155f18(struct bregs *regs)
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{
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regs->eax = 0x5f;
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u32 ramspeed = getRamSpeed();
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u32 fbsize = getFBSize();
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regs->ebx = 0x500 | (ramspeed << 4) | fbsize;
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regs->ecx = 0x060;
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set_success(regs);
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}
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static void
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handle_155f19(struct bregs *regs)
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{
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set_fail_silent(regs);
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}
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static void
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handle_155fXX(struct bregs *regs)
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{
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set_code_fail(regs, RET_EUNSUPPORTED);
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}
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void
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handle_155f(struct bregs *regs)
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{
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if (! CONFIG_VGAHOOKS) {
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handle_155fXX(regs);
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return;
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}
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switch (regs->al) {
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case 0x01: handle_155f01(regs); break;
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case 0x02: handle_155f02(regs); break;
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case 0x18: handle_155f18(regs); break;
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case 0x19: handle_155f19(regs); break;
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default: handle_155fXX(regs); break;
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}
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}
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