void *
vga_pci_map_bios(device_t dev, size_t *size)
{
int rid;
struct resource *res;
#if defined(__amd64__) || defined(__i386__) || defined(__ia64__)
if (vga_pci_is_boot_display(dev)) {
/*
* On x86, the System BIOS copy the default display
* device's Video BIOS at a fixed location in system
* memory (0xC0000, 128 kBytes long) at boot time.
*
* We use this copy for the default boot device, because
* the original ROM may not be valid after boot.
*/
*size = VGA_PCI_BIOS_SHADOW_SIZE;
return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size));
}
#endif
rid = PCIR_BIOS;
res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0ul,
~0ul, 1, RF_ACTIVE);
if (res == NULL) {
return (NULL);
}
*size = rman_get_size(res);
return (rman_get_virtual(res));
}
void
vga_pci_unmap_bios(device_t dev, void *bios)
{
struct vga_resource *vr;
if (bios == NULL) {
return;
}
#if defined(__amd64__) || defined(__i386__) || defined(__ia64__)
if (vga_pci_is_boot_display(dev)) {
/* We mapped the BIOS shadow copy located at 0xC0000. */
pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE);
return;
}
#endif
/*
* Look up the PCIR_BIOS resource in our softc. It should match
* the address we returned previously.
*/
vr = lookup_res(device_get_softc(dev), PCIR_BIOS);
KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped"));
KASSERT(rman_get_virtual(vr->vr_res) == bios,
("vga_pci_unmap_bios: mismatch"));
vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, PCIR_BIOS,
vr->vr_res);
}
int
vga_pci_repost(device_t dev)
{
#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
x86regs_t regs;
if (!vga_pci_is_boot_display(dev))
return (EINVAL);
if (x86bios_get_orm(VGA_PCI_BIOS_SHADOW_ADDR) == NULL)
return (ENOTSUP);
x86bios_init_regs(®s);
regs.R_AH = pci_get_bus(dev);
regs.R_AL = (pci_get_slot(dev) << 3) | (pci_get_function(dev) & 0x07);
regs.R_DL = 0x80;
device_printf(dev, "REPOSTing\n");
x86bios_call(®s, X86BIOS_PHYSTOSEG(VGA_PCI_BIOS_SHADOW_ADDR + 3),
X86BIOS_PHYSTOOFF(VGA_PCI_BIOS_SHADOW_ADDR + 3));
x86bios_get_intr(0x10);
return (0);
#else
return (ENOTSUP);
#endif
}
static int
vga_pci_attach(device_t dev)
{
bus_generic_probe(dev);
/* Always create a drm child for now to make it easier on drm. */
device_add_child(dev, "drm", -1);
device_add_child(dev, "drmn", -1);
bus_generic_attach(dev);
if (vga_pci_is_boot_display(dev))
device_printf(dev, "Boot video device\n");
return (0);
}
static int
vga_pci_probe(device_t dev)
{
switch (pci_get_class(dev)) {
case PCIC_DISPLAY:
break;
case PCIC_OLD:
if (pci_get_subclass(dev) != PCIS_OLD_VGA)
return (ENXIO);
break;
default:
return (ENXIO);
}
/* Probe default display. */
vga_pci_is_boot_display(dev);
device_set_desc(dev, "VGA-compatible display");
return (BUS_PROBE_GENERIC);
}
