Initial revision

1 files changed, 223 insertions, 0 deletions

diff --git a/bsd-core/drm_fops.c b/bsd-core/drm_fops.c
new file mode 100644
index 00000000..53af39cd
--- /dev/null
+++ b/bsd-core/drm_fops.c
@@ -0,0 +1,223 @@
+/* drm_fops.h -- File operations for DRM -*- linux-c -*-
+ * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * 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
+ * VA LINUX SYSTEMS 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.
+ *
+ * Authors:
+ *    Rickard E. (Rik) Faith <faith@valinux.com>
+ *    Daryll Strauss <daryll@valinux.com>
+ *    Gareth Hughes <gareth@valinux.com>
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+
+#include <sys/signalvar.h>
+#include <sys/poll.h>
+
+drm_file_t *DRM(find_file_by_proc)(drm_device_t *dev, DRM_OS_STRUCTPROC *p)
+{
+#if __FreeBSD_version >= 500021
+	uid_t uid = p->td_proc->p_ucred->cr_svuid;
+	pid_t pid = p->td_proc->p_pid;
+#else
+	uid_t uid = p->p_cred->p_svuid;
+	pid_t pid = p->p_pid;
+#endif
+	drm_file_t *priv;
+
+	TAILQ_FOREACH(priv, &dev->files, link)
+		if (priv->pid == pid && priv->uid == uid)
+			return priv;
+	return NULL;
+}
+
+/* DRM(open) is called whenever a process opens /dev/drm. */
+
+int DRM(open_helper)(dev_t kdev, int flags, int fmt, DRM_OS_STRUCTPROC *p,
+		    drm_device_t *dev)
+{
+	int	     m = minor(kdev);
+	drm_file_t   *priv;
+
+	if (flags & O_EXCL)
+		return EBUSY; /* No exclusive opens */
+	dev->flags = flags;
+	if (!DRM(cpu_valid)())
+		DRM_OS_RETURN(EINVAL);
+
+	DRM_DEBUG("pid = %d, minor = %d\n", DRM_OS_CURRENTPID, m);
+
+	/* FIXME: linux mallocs and bzeros here */
+	priv = (drm_file_t *) DRM(find_file_by_proc)(dev, p);
+	if (priv) {
+		priv->refs++;
+	} else {
+		priv = (drm_file_t *) DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
+		bzero(priv, sizeof(*priv));
+#if __FreeBSD_version >= 500000
+		priv->uid		= p->td_proc->p_ucred->cr_svuid;
+		priv->pid		= p->td_proc->p_pid;
+#else
+		priv->uid		= p->p_cred->p_svuid;
+		priv->pid		= p->p_pid;
+#endif
+
+		priv->refs		= 1;
+		priv->minor		= m;
+		priv->devXX		= dev;
+		priv->ioctl_count 	= 0;
+		priv->authenticated	= !DRM_OS_CHECKSUSER;
+		lockmgr(&dev->dev_lock, LK_EXCLUSIVE, 0, p);
+		TAILQ_INSERT_TAIL(&dev->files, priv, link);
+		lockmgr(&dev->dev_lock, LK_RELEASE, 0, p);
+	}
+
+	kdev->si_drv1 = dev;
+
+
+	return 0;
+}
+
+
+/* The drm_read and drm_write_string code (especially that which manages
+   the circular buffer), is based on Alessandro Rubini's LINUX DEVICE
+   DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */
+
+ssize_t DRM(read)(dev_t kdev, struct uio *uio, int ioflag)
+{
+	DRM_OS_DEVICE;
+	int	      left;
+	int	      avail;
+	int	      send;
+	int	      cur;
+	int           error = 0;
+
+	DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
+
+	while (dev->buf_rp == dev->buf_wp) {
+		DRM_DEBUG("  sleeping\n");
+		if (dev->flags & FASYNC)
+			return EWOULDBLOCK;
+		error = tsleep(&dev->buf_rp, PZERO|PCATCH, "drmrd", 0);
+		if (error) {
+			DRM_DEBUG("  interrupted\n");
+			return error;
+		}
+		DRM_DEBUG("  awake\n");
+	}
+
+	left  = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
+	avail = DRM_BSZ - left;
+	send  = DRM_MIN(avail, uio->uio_resid);
+
+	while (send) {
+		if (dev->buf_wp > dev->buf_rp) {
+			cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp);
+		} else {
+			cur = DRM_MIN(send, dev->buf_end - dev->buf_rp);
+		}
+		error = uiomove(dev->buf_rp, cur, uio);
+		if (error)
+			break;
+		dev->buf_rp += cur;
+		if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
+		send -= cur;
+	}
+
+	wakeup(&dev->buf_wp);
+	return error;
+}
+
+int DRM(write_string)(drm_device_t *dev, const char *s)
+{
+	int left   = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
+	int send   = strlen(s);
+	int count;
+
+	DRM_DEBUG("%d left, %d to send (%p, %p)\n",
+		  left, send, dev->buf_rp, dev->buf_wp);
+
+	if (left == 1 || dev->buf_wp != dev->buf_rp) {
+		DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n",
+			  left,
+			  dev->buf_wp,
+			  dev->buf_rp);
+	}
+
+	while (send) {
+		if (dev->buf_wp >= dev->buf_rp) {
+			count = DRM_MIN(send, dev->buf_end - dev->buf_wp);
+			if (count == left) --count; /* Leave a hole */
+		} else {
+			count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1);
+		}
+		strncpy(dev->buf_wp, s, count);
+		dev->buf_wp += count;
+		if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf;
+		send -= count;
+	}
+
+	if (dev->buf_selecting) {
+		dev->buf_selecting = 0;
+		selwakeup(&dev->buf_sel);
+	}
+		
+	DRM_DEBUG("dev->buf_sigio=%p\n", dev->buf_sigio);
+	if (dev->buf_sigio) {
+		DRM_DEBUG("dev->buf_sigio->sio_pgid=%d\n", dev->buf_sigio->sio_pgid);
+		pgsigio(dev->buf_sigio, SIGIO, 0);
+	}
+	DRM_DEBUG("waking\n");
+	wakeup(&dev->buf_rp);
+
+	return 0;
+}
+
+int DRM(poll)(dev_t kdev, int events, DRM_OS_STRUCTPROC *p)
+{
+	drm_device_t  *dev    = kdev->si_drv1;
+	int           s;
+	int	      revents = 0;
+
+	s = spldrm();
+	if (events & (POLLIN | POLLRDNORM)) {
+		int left  = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
+		if (left > 0)
+			revents |= events & (POLLIN | POLLRDNORM);
+		else
+			selrecord(p, &dev->buf_sel);
+	}
+	splx(s);
+
+	return revents;
+}
+
+int DRM(write)(dev_t kdev, struct uio *uio, int ioflag)
+{
+        DRM_DEBUG("pid = %d, device = %p, open_count = %d\n",
+                  curproc->p_pid, ((drm_device_t *)kdev->si_drv1)->device, ((drm_device_t *)kdev->si_drv1)->open_count);
+        return 0;
+}