1 files changed, 78 insertions, 0 deletions
diff --git a/sys/vm/vm_device.c b/sys/vm/vm_device.c
new file mode 100644
index 0000000..e990b47
--- /dev/null
+++ b/sys/vm/vm_device.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/device.h>
+#include <sys/syslog.h>
+#include <vm/vm_device.h>
+
+#define pr_trace(fmt, ...) kprintf("vm_device: " fmt, ##__VA_ARGS__)
+#define pr_error(...) pr_trace(__VA_ARGS__)
+
+const struct vm_pagerops dv_vnops;
+
+/*
+ * Attach a cdev to a vm_object
+ *
+ * @major: Char device major
+ * @minor: Char device minor.
+ */
+struct vm_object *
+dv_attach(devmajor_t major, dev_t dev, vm_prot_t prot)
+{
+    int error;
+    struct cdevsw *cdevp;
+    struct vm_object *vmobj;
+
+    if ((cdevp = dev_get(major, dev)) == NULL) {
+        pr_error("bad attach (major=%d, dev=%d)\n", major, dev);
+        return NULL;
+    }
+
+    if (cdevp->mmap == NULL) {
+        pr_error("cdev lacks mmap() (major=%d, dev=%d)\n", major, dev);
+        return NULL;
+    }
+
+    error = vm_obj_init(&cdevp->vmobj, &dv_vnops, 1);
+    if (error != 0) {
+        return NULL;
+    }
+
+    vmobj = &cdevp->vmobj;
+    vmobj->prot = prot;
+    vmobj->data = cdevp;
+    vmobj->pgops = &dv_vnops;
+    return vmobj;
+}
+
+/* TODO */
+const struct vm_pagerops dv_vnops = {
+    .get = NULL,
+};