From 14945ada16218e9f918c24e0d702979fae9b07f6 Mon Sep 17 00:00:00 2001
From: David Dawes <dawes@xfree86.org>
Date: Sun, 27 Jan 2002 18:23:04 +0000
Subject: Import of XFree86 4.2.0

---
 bsd-core/drm_vm.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 bsd-core/drm_vm.c

(limited to 'bsd-core/drm_vm.c')

diff --git a/bsd-core/drm_vm.c b/bsd-core/drm_vm.c
new file mode 100644
index 00000000..a06fb448
--- /dev/null
+++ b/bsd-core/drm_vm.c
@@ -0,0 +1,81 @@
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+static int DRM(dma_mmap)(dev_t kdev, vm_offset_t offset, int prot)
+{
+	drm_device_t	 *dev	 = kdev->si_drv1;
+	drm_device_dma_t *dma	 = dev->dma;
+	unsigned long	 physical;
+	unsigned long	 page;
+
+	if (!dma)		   return -1; /* Error */
+	if (!dma->pagelist)	   return -1; /* Nothing allocated */
+
+	page	 = offset >> PAGE_SHIFT;
+	physical = dma->pagelist[page];
+
+	DRM_DEBUG("0x%08x (page %lu) => 0x%08lx\n", offset, page, physical);
+	return atop(physical);
+}
+
+int DRM(mmap)(dev_t kdev, vm_offset_t offset, int prot)
+{
+	drm_device_t	*dev	= kdev->si_drv1;
+	drm_map_t	*map	= NULL;
+	drm_map_list_entry_t *listentry=NULL;
+	/*drm_file_t *priv;*/
+
+/*	DRM_DEBUG("offset = 0x%x\n", offset);*/
+
+	/*XXX Fixme */
+	/*priv = DRM(find_file_by_proc)(dev, p);
+	if (!priv) {
+		DRM_DEBUG("can't find authenticator\n");
+		return EINVAL;
+	}
+
+	if (!priv->authenticated) DRM_OS_RETURN(EACCES);*/
+
+	if (dev->dma
+	    && offset >= 0
+	    && offset < ptoa(dev->dma->page_count))
+		return DRM(dma_mmap)(kdev, offset, prot);
+
+				/* A sequential search of a linked list is
+				   fine here because: 1) there will only be
+				   about 5-10 entries in the list and, 2) a
+				   DRI client only has to do this mapping
+				   once, so it doesn't have to be optimized
+				   for performance, even if the list was a
+				   bit longer. */
+	TAILQ_FOREACH(listentry, dev->maplist, link) {
+		map = listentry->map;
+/*		DRM_DEBUG("considering 0x%x..0x%x\n", map->offset, map->offset + map->size - 1);*/
+		if (offset >= map->offset
+		    && offset < map->offset + map->size) break;
+	}
+	
+	if (!listentry) {
+		DRM_DEBUG("can't find map\n");
+		return -1;
+	}
+	if (((map->flags&_DRM_RESTRICTED) && suser(curproc))) {
+		DRM_DEBUG("restricted map\n");
+		return -1;
+	}
+
+	switch (map->type) {
+	case _DRM_FRAME_BUFFER:
+	case _DRM_REGISTERS:
+	case _DRM_AGP:
+		return atop(offset);
+	case _DRM_SHM:
+		return atop(vtophys(offset));
+	default:
+		return -1;	/* This should never happen. */
+	}
+	DRM_DEBUG("bailing out\n");
+	
+	return -1;
+}
+
-- 
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