static struct resource *
vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
struct vga_resource *vr;
switch (type) {
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
/*
* For BARs, we cache the resource so that we only allocate it
* from the PCI bus once.
*/
vr = lookup_res(device_get_softc(dev), *rid);
if (vr == NULL)
return (NULL);
if (vr->vr_res == NULL)
vr->vr_res = bus_alloc_resource(dev, type, rid, start,
end, count, flags);
if (vr->vr_res != NULL)
vr->vr_refs++;
return (vr->vr_res);
}
return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
}
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);
}
static int
vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
struct vga_resource *vr;
int error;
switch (type) {
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
/*
* For BARs, we release the resource from the PCI bus
* when the last child reference goes away.
*/
vr = lookup_res(device_get_softc(dev), rid);
if (vr == NULL)
return (EINVAL);
if (vr->vr_res == NULL)
return (EINVAL);
KASSERT(vr->vr_res == r, ("vga_pci resource mismatch"));
if (vr->vr_refs > 1) {
vr->vr_refs--;
return (0);
}
KASSERT(vr->vr_refs > 0,
("vga_pci resource reference count underflow"));
error = bus_release_resource(dev, type, rid, r);
if (error == 0) {
vr->vr_res = NULL;
vr->vr_refs = 0;
}
return (error);
}
return (bus_release_resource(dev, type, rid, r));
}
