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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 LGPLv3 license.
#include "bregs.h" // set_code_invalid
#include "biosvar.h" // GET_GLOBAL
#include "pci.h" // pci_find_device
#include "pci_regs.h" // PCI_VENDOR_ID
#include "pci_ids.h" // PCI_VENDOR_ID_VIA
#include "util.h" // handle_155f
#include "config.h" // CONFIG_*
#define VH_VIA 1
#define VH_INTEL 2
int VGAHookHandlerType VAR16VISIBLE;
static void
handle_155fXX(struct bregs *regs)
{
set_code_unimplemented(regs, RET_EUNSUPPORTED);
}
/****************************************************************
* Via hooks
****************************************************************/
int ViaFBsize VAR16VISIBLE, ViaRamSpeed VAR16VISIBLE;
static void
via_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
via_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 void
via_155f18(struct bregs *regs)
{
int fbsize = GET_GLOBAL(ViaFBsize), ramspeed = GET_GLOBAL(ViaRamSpeed);
if (fbsize < 0 || ramspeed < 0) {
set_code_invalid(regs, RET_EUNSUPPORTED);
return;
}
regs->eax = 0x5f;
regs->ebx = 0x500 | (ramspeed << 4) | fbsize;
regs->ecx = 0x060;
set_success(regs);
}
static void
via_155f19(struct bregs *regs)
{
set_invalid_silent(regs);
}
static void
via_155f(struct bregs *regs)
{
switch (regs->al) {
case 0x01: via_155f01(regs); break;
case 0x02: via_155f02(regs); break;
case 0x18: via_155f18(regs); break;
case 0x19: via_155f19(regs); break;
default: handle_155fXX(regs); break;
}
}
static int
getFBSize(struct pci_device *pci)
{
/* FB config */
u8 reg = pci_config_readb(pci->bdf, 0xa1);
/* GFX disabled ? */
if (!(reg & 0x80))
return -1;
static u8 mem_power[] = {0, 3, 4, 5, 6, 7, 8, 9};
return mem_power[(reg >> 4) & 0x7];
}
static int
getViaRamSpeed(struct pci_device *pci)
{
return (pci_config_readb(pci->bdf, 0x90) & 0x07) + 3;
}
static int
getAMDRamSpeed(void)
{
struct pci_device *pci = pci_find_device(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_K8_NB_MEMCTL);
if (!pci)
return -1;
/* mem clk 0 = DDR2 400 */
return (pci_config_readb(pci->bdf, 0x94) & 0x7) + 6;
}
/* 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
*/
#define PCI_DEVICE_ID_VIA_K8M890CE_3 0x3336
#define PCI_DEVICE_ID_VIA_VX855_MEMCTRL 0x3409
static void
via_setup(struct pci_device *pci)
{
VGAHookHandlerType = VH_VIA;
struct pci_device *d = pci_find_device(PCI_VENDOR_ID_VIA
, PCI_DEVICE_ID_VIA_K8M890CE_3);
if (d) {
ViaFBsize = getFBSize(d);
ViaRamSpeed = getAMDRamSpeed();
return;
}
d = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855_MEMCTRL);
if (d) {
ViaFBsize = getFBSize(d);
ViaRamSpeed = getViaRamSpeed(d);
return;
}
dprintf(1, "Warning: VGA memory size and speed is hardcoded\n");
ViaFBsize = 5; // 32M frame buffer
ViaRamSpeed = 4; // MCLK = DDR266
}
/****************************************************************
* Intel VGA hooks
****************************************************************/
u8 IntelDisplayType VAR16VISIBLE, IntelDisplayId VAR16VISIBLE;
static void
intel_155f35(struct bregs *regs)
{
regs->ax = 0x005f;
regs->cl = GET_GLOBAL(IntelDisplayType);
set_success(regs);
}
static void
intel_155f40(struct bregs *regs)
{
regs->ax = 0x005f;
regs->cl = GET_GLOBAL(IntelDisplayId);
set_success(regs);
}
static void
intel_155f(struct bregs *regs)
{
switch (regs->al) {
case 0x35: intel_155f35(regs); break;
case 0x40: intel_155f40(regs); break;
default: handle_155fXX(regs); break;
}
}
#define BOOT_DISPLAY_DEFAULT (0)
#define BOOT_DISPLAY_CRT (1 << 0)
#define BOOT_DISPLAY_TV (1 << 1)
#define BOOT_DISPLAY_EFP (1 << 2)
#define BOOT_DISPLAY_LCD (1 << 3)
#define BOOT_DISPLAY_CRT2 (1 << 4)
#define BOOT_DISPLAY_TV2 (1 << 5)
#define BOOT_DISPLAY_EFP2 (1 << 6)
#define BOOT_DISPLAY_LCD2 (1 << 7)
static void
roda_setup(struct pci_device *pci)
{
VGAHookHandlerType = VH_INTEL;
// IntelDisplayType = BOOT_DISPLAY_DEFAULT;
IntelDisplayType = BOOT_DISPLAY_LCD;
// IntelDisplayId = inb(0x60f) & 0x0f; // Correct according to Crete
IntelDisplayId = 3; // Correct according to empirical studies
}
static void
kontron_setup(struct pci_device *pci)
{
VGAHookHandlerType = VH_INTEL;
IntelDisplayType = BOOT_DISPLAY_CRT;
IntelDisplayId = 3;
}
static void
getac_setup(struct pci_device *pci)
{
}
/****************************************************************
* Entry and setup
****************************************************************/
// Main 16bit entry point
void
handle_155f(struct bregs *regs)
{
if (!CONFIG_VGAHOOKS) {
handle_155fXX(regs);
return;
}
int htype = GET_GLOBAL(VGAHookHandlerType);
switch (htype) {
case VH_VIA: via_155f(regs); break;
case VH_INTEL: intel_155f(regs); break;
default: handle_155fXX(regs); break;
}
}
// Setup
void
vgahook_setup(struct pci_device *pci)
{
if (!CONFIG_VGAHOOKS || !CBvendor || !CBpart)
return;
if (strcmp(CBvendor, "KONTRON") == 0 && strcmp(CBpart, "986LCD-M") == 0)
kontron_setup(pci);
else if (strcmp(CBvendor, "GETAC") == 0 && strcmp(CBpart, "P470") == 0)
getac_setup(pci);
else if (strcmp(CBvendor, "RODA") == 0 && strcmp(CBpart, "RK886EX") == 0)
roda_setup(pci);
else if (pci->vendor == PCI_VENDOR_ID_VIA)
via_setup(pci);
}