1 files changed, 70 insertions, 1 deletions

diff --git a/linux/drm_vm.h b/linux/drm_vm.h
index d8e77f79..2a5ee146 100644
--- a/linux/drm_vm.h
+++ b/linux/drm_vm.h
@@ -67,6 +67,64 @@ struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
 			    int write_access)
 #endif
 {
+#if defined(__alpha__) && __REALLY_HAVE_AGP
+        drm_file_t *priv  = vma->vm_file->private_data;
+        drm_device_t *dev = priv->dev;
+        drm_map_t *map    = NULL;
+        drm_map_list_t  *r_list;
+        struct list_head *list;
+
+        /*
+         * Find the right map
+         */
+        list_for_each(list, &dev->maplist->head) {
+                r_list = (drm_map_list_t *)list;
+                map = r_list->map;
+                if (!map) continue;
+                if (map->offset == VM_OFFSET(vma)) break;
+        }
+
+        if (map && map->type == _DRM_AGP) {
+                unsigned long offset = address - vma->vm_start;
+                unsigned long baddr = VM_OFFSET(vma) + offset;
+                struct drm_agp_mem *agpmem;
+                struct page *page;
+
+                /*
+                 * Make it a bus-relative address
+                 */
+                baddr -= dev->hose->mem_space->start;
+
+                /*
+                 * It's AGP memory - find the real physical page to map
+                 */
+                for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
+                        if (agpmem->bound <= baddr &&
+                            agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 
+                                break;
+                }
+
+                if (!agpmem) {
+                        /*
+                         * Oops - no memory found
+                         */
+                        return NOPAGE_SIGBUS;   /* couldn't find it */
+                }
+
+                /*
+                 * Get the page, inc the use count, and return it
+                 */
+                offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
+		agpmem->memory->memory[offset] &= ~1UL; /* HACK */
+                page = virt_to_page(__va(agpmem->memory->memory[offset]));
+#if 0
+DRM_ERROR("baddr = 0x%lx page = 0x%lx, offset = 0x%lx\n",
+          baddr, __va(agpmem->memory->memory[offset]), offset);
+#endif
+                get_page(page);
+                return page;
+        }
+#endif
 	return NOPAGE_SIGBUS;		/* Disallow mremap */
 }
 
@@ -434,9 +492,20 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 	}
 
 	switch (map->type) {
+        case _DRM_AGP:
+#if defined(__alpha__)
+                /*
+                 * On Alpha we can't talk to bus dma address from the
+                 * CPU, so for memory of type DRM_AGP, we'll deal with
+                 * sorting out the real physical pages and mappings
+                 * in nopage()
+                 */
+                vma->vm_ops = &DRM(vm_ops);
+                break;
+#endif
+                /* fall through to _DRM_FRAME_BUFFER... */        
 	case _DRM_FRAME_BUFFER:
 	case _DRM_REGISTERS:
-	case _DRM_AGP:
 		if (VM_OFFSET(vma) >= __pa(high_memory)) {
 #if defined(__i386__)
 			if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {