| // Hooks for via vgabios calls into main bios. |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "bregs.h" // set_code_fail |
| #include "biosvar.h" // GET_GLOBAL |
| #include "pci.h" // pci_find_device |
| #include "pci_ids.h" // PCI_VENDOR_ID_VIA |
| #include "util.h" // handle_155f |
| #include "config.h" // CONFIG_* |
| |
| static void |
| handle_155f01(struct bregs *regs) |
| { |
| regs->eax = 0x5f; |
| regs->cl = 2; // panel type = 2 = 1024 * 768 |
| set_success(regs); |
| dprintf(1, "Warning: VGA panel type is hardcoded\n"); |
| } |
| |
| static void |
| handle_155f02(struct bregs *regs) |
| { |
| regs->eax = 0x5f; |
| regs->bx = 2; |
| regs->cx = 0x401; // PAL + crt only |
| regs->dx = 0; // TV Layout - default |
| set_success(regs); |
| dprintf(1, "Warning: VGA TV/CRT output type is hardcoded\n"); |
| } |
| |
| static int |
| getFBSize() |
| { |
| /* Find K8M890 */ |
| int bdf = pci_find_device(PCI_VENDOR_ID_VIA, 0x3336); |
| if (bdf < 0) |
| goto err; |
| |
| /* FB config */ |
| u8 reg = pci_config_readb(bdf, 0xa1); |
| |
| /* GFX disabled ? */ |
| if (!(reg & 0x80)) |
| goto err; |
| |
| static u8 mem_power[] VAR16 = {0, 3, 4, 5, 6, 7, 8, 9}; |
| return GET_GLOBAL(mem_power[(reg >> 4) & 0x7]); |
| err: |
| dprintf(1, "Warning: VGA memory size is hardcoded\n"); |
| return 5; // 32M frame buffer |
| } |
| |
| static int |
| getRamSpeed() |
| { |
| int bdf = pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MEMCTL); |
| if (bdf < 0) |
| goto err; |
| |
| /* mem clk 0 = DDR2 400 */ |
| u8 reg = pci_config_readb(bdf, 0x94) & 0x7; |
| return reg + 6; |
| err: |
| dprintf(1, "Warning: VGA memory clock speed is hardcoded\n"); |
| return 4; // MCLK = DDR266 |
| } |
| |
| /* int 0x15 - 5f18 |
| |
| ECX = unknown/dont care |
| EBX[3..0] Frame Buffer Size 2^N MiB |
| EBX[7..4] Memory speed: |
| 0: SDR 66Mhz |
| 1: SDR 100Mhz |
| 2: SDR 133Mhz |
| 3: DDR 100Mhz (PC1600 or DDR200) |
| 4: DDR 133Mhz (PC2100 or DDR266) |
| 5: DDR 166Mhz (PC2700 or DDR333) |
| 6: DDR 200Mhz (PC3200 or DDR400) |
| 7: DDR2 133Mhz (DDR2 533) |
| 8: DDR2 166Mhz (DDR2 667) |
| 9: DDR2 200Mhz (DDR2 800) |
| A: DDR2 233Mhz (DDR2 1066) |
| B: and above: Unknown |
| EBX[?..8] Total memory size? |
| EAX = 0x5f for success |
| |
| K8M890 BIOS wants only this call (Desktop NoTv) |
| */ |
| |
| static void |
| handle_155f18(struct bregs *regs) |
| { |
| regs->eax = 0x5f; |
| u32 ramspeed = getRamSpeed(); |
| u32 fbsize = getFBSize(); |
| regs->ebx = 0x500 | (ramspeed << 4) | fbsize; |
| regs->ecx = 0x060; |
| set_success(regs); |
| } |
| |
| static void |
| handle_155f19(struct bregs *regs) |
| { |
| set_fail_silent(regs); |
| } |
| |
| static void |
| handle_155fXX(struct bregs *regs) |
| { |
| set_code_fail(regs, RET_EUNSUPPORTED); |
| } |
| |
| void |
| handle_155f(struct bregs *regs) |
| { |
| if (! CONFIG_VGAHOOKS) { |
| handle_155fXX(regs); |
| return; |
| } |
| |
| switch (regs->al) { |
| case 0x01: handle_155f01(regs); break; |
| case 0x02: handle_155f02(regs); break; |
| case 0x18: handle_155f18(regs); break; |
| case 0x19: handle_155f19(regs); break; |
| default: handle_155fXX(regs); break; |
| } |
| } |