From fa0a35a25fd008617ef6c7444cb92b138dd01859 Mon Sep 17 00:00:00 2001
From: Doug Rabson <dfr@freebsd.org>
Date: Tue, 30 May 2000 17:13:31 +0000
Subject: Merged bsd-1-0-0

---
 bsd/drm/vm.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 bsd/drm/vm.c

(limited to 'bsd/drm/vm.c')

diff --git a/bsd/drm/vm.c b/bsd/drm/vm.c
new file mode 100644
index 00000000..9c457fca
--- /dev/null
+++ b/bsd/drm/vm.c
@@ -0,0 +1,104 @@
+/* vm.c -- Memory mapping for DRM -*- c -*-
+ * Created: Mon Jan  4 08:58:31 1999 by faith@precisioninsight.com
+ * Revised: Fri Aug 20 22:48:11 1999 by faith@precisioninsight.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ * 
+ * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.7 1999/08/21 02:48:34 faith Exp $
+ * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.1 1999/09/25 14:38:02 dawes Exp $
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+#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;
+	int		i;
+	
+	/* DRM_DEBUG("offset = 0x%x\n", offset); */
+
+	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. */
+	for (i = 0; i < dev->map_count; i++) {
+		map = dev->maplist[i];
+		/* 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 (i >= dev->map_count) {
+		DRM_DEBUG("can't find map\n");
+		return -1;
+	}
+	if (!map || ((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;
+}
-- 
cgit v1.2.3