Rework how drm maps are handled.

 * On 32 bit platforms we steal the upper 4 bits of the map handle
   to store a unique map id.
 * On 64 bit platforms we steal the upper 24 bits.

Resolves issues where the offsets that are handed to mmap may overlap the VRAM on some cards.

Tested on: radeon, intel, mga, and via.

This will break nouveau.  I will spin new patches shortly.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/dev/drm/drm_context.c b/sys/dev/drm/drm_context.c
index 398008b..3c13b43 100644
--- a/sys/dev/drm/drm_context.c
+++ b/sys/dev/drm/drm_context.c
@@ -147,7 +147,7 @@ int drm_getsareactx(struct drm_device *dev, void *data,
 	map = dev->context_sareas[request->ctx_id];
 	DRM_UNLOCK();
 
-	request->handle = map->handle;
+	request->handle = (void *)map->handle;
 
 	return 0;
 }