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// 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 GPLv3 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;
}
}
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