diff options
| -rw-r--r-- | bsd-core/drm_agpsupport.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/bsd-core/drm_agpsupport.c b/bsd-core/drm_agpsupport.c index e26be833..ff890e27 100644 --- a/bsd-core/drm_agpsupport.c +++ b/bsd-core/drm_agpsupport.c @@ -32,11 +32,47 @@ #include "drmP.h" +#ifdef __FreeBSD__ +#include <pci/agpreg.h> +#include <dev/pci/pcireg.h> +#endif + int drm_device_is_agp(drm_device_t *dev) { - /* XXX: FILL ME IN HERE */ +#ifdef __FreeBSD__ + /* Code taken from agp.c. IWBNI that was a public interface. */ + u_int32_t status; + u_int8_t ptr, next; + + /* + * Check the CAP_LIST bit of the PCI status register first. + */ + status = pci_read_config(dev->device, PCIR_STATUS, 2); + if (!(status & 0x10)) + return 0; + + /* + * Traverse the capabilities list. + */ + for (ptr = pci_read_config(dev->device, AGP_CAPPTR, 1); + ptr != 0; + ptr = next) { + u_int32_t capid = pci_read_config(dev->device, ptr, 4); + next = AGP_CAPID_GET_NEXT_PTR(capid); + + /* + * If this capability entry ID is 2, then we are done. + */ + if (AGP_CAPID_GET_CAP_ID(capid) == 2) + return 1; + } + + return 0; +#else + /* XXX: fill me in for non-FreeBSD */ return 1; +#endif } int drm_agp_info(DRM_IOCTL_ARGS) |