#include "bregs.h" // set_code_fail
#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_*
+// The Bus/Dev/Fn of the primary VGA device.
+int VGAbdf VAR16_32;
+// Coreboot board detected.
+int CBmainboard VAR16_32;
+
static void
-handle_155f01(struct bregs *regs)
+handle_155fXX(struct bregs *regs)
+{
+ set_code_fail(regs, RET_EUNSUPPORTED);
+}
+
+
+/****************************************************************
+ * Via hooks
+ ****************************************************************/
+
+static void
+via_155f01(struct bregs *regs)
{
regs->eax = 0x5f;
regs->cl = 2; // panel type = 2 = 1024 * 768
}
static void
-handle_155f02(struct bregs *regs)
+via_155f02(struct bregs *regs)
{
regs->eax = 0x5f;
regs->bx = 2;
}
static int
-getFBSize()
+getFBSize(u16 bdf)
{
- /* 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;
+ return -1;
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()
+getViaRamSpeed(u16 bdf)
+{
+ return (pci_config_readb(bdf, 0x90) & 0x07) + 3;
+}
+
+static int
+getAMDRamSpeed()
{
int bdf = pci_find_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MEMCTL);
if (bdf < 0)
- goto err;
+ return -1;
/* 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
+ return (pci_config_readb(bdf, 0x94) & 0x7) + 6;
}
/* int 0x15 - 5f18
B: and above: Unknown
EBX[?..8] Total memory size?
EAX = 0x5f for success
-
- K8M890 BIOS wants only this call (Desktop NoTv)
*/
+#define PCI_DEVICE_ID_VIA_K8M890CE_3 0x3336
+#define PCI_DEVICE_ID_VIA_VX855_MEMCTRL 0x3409
+
static void
-handle_155f18(struct bregs *regs)
+via_155f18(struct bregs *regs)
{
+ u32 ramspeed, fbsize;
+
+ int bdf = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_K8M890CE_3);
+ if (bdf >= 0) {
+ fbsize = getFBSize(bdf);
+ ramspeed = getAMDRamSpeed();
+ goto done;
+ }
+ bdf = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855_MEMCTRL);
+ if (bdf >= 0) {
+ fbsize = getFBSize(bdf);
+ ramspeed = getViaRamSpeed(bdf);
+ goto done;
+ }
+
+ dprintf(1, "Warning: VGA memory size and speed is hardcoded\n");
+ fbsize = 5; // 32M frame buffer
+ ramspeed = 4; // MCLK = DDR266
+
+done:
+ if (fbsize < 0 || ramspeed < 0) {
+ set_code_fail(regs, RET_EUNSUPPORTED);
+ return;
+ }
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)
+via_155f19(struct bregs *regs)
{
set_fail_silent(regs);
}
static void
-handle_155fXX(struct bregs *regs)
+via_155f(struct bregs *regs)
{
- set_code_fail(regs, RET_EUNSUPPORTED);
+ 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;
+ }
}
+
+/****************************************************************
+ * Entry and setup
+ ****************************************************************/
+
+// Main 16bit entry point
void
handle_155f(struct bregs *regs)
{
- if (! CONFIG_VGAHOOKS) {
- handle_155fXX(regs);
+ if (! CONFIG_VGAHOOKS)
+ goto fail;
+
+ // XXX - Use this value later.
+ //int cbmb = GET_GLOBAL(CBmainboard);
+
+ int bdf = GET_GLOBAL(VGAbdf);
+ if (bdf < 0)
+ goto fail;
+ u16 vendor = pci_config_readw(bdf, PCI_VENDOR_ID);
+ if (vendor == PCI_VENDOR_ID_VIA) {
+ via_155f(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;
- }
+fail:
+ handle_155fXX(regs);
+}
+
+// Setup
+void
+vgahook_setup(const char *vendor, const char *part)
+{
+ if (! CONFIG_VGAHOOKS)
+ return;
+ // XXX - add support later.
+ CBmainboard = 0;
}