kern: fbdev: Create namespace object for fbdev

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 88 insertions, 0 deletions

diff --git a/src/sys/include/sys/fbdev.h b/src/sys/include/sys/fbdev.h
new file mode 100644
index 0000000..b0f3fb1
--- /dev/null
+++ b/src/sys/include/sys/fbdev.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * 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 the project 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.
+ */
+
+#ifndef _FBDEV_H_
+#define _FBDEV_H_ 1
+
+#include <sys/types.h>
+#if !defined(_KERNEL)
+#include <stdint.h>
+#endif  /* !_KERNEL */
+
+#define FBDEV_NSO "system:video:attr"
+
+struct fb_info {
+    uint32_t width;
+    uint32_t height;
+    uint32_t pitch;
+};
+
+#endif  /* !_FBDEV_H_ */
diff --git a/src/sys/io/video/fbdev.c b/src/sys/io/video/fbdev.c
index 51abea3..1464f0c 100644
--- a/src/sys/io/video/fbdev.c
+++ b/src/sys/io/video/fbdev.c
@@ -28,13 +28,20 @@
  */
 
 #include <sys/bootvars.h>
+#include <sys/errno.h>
 #include <sys/proc.h>
 #include <sys/mman.h>
 #include <sys/types.h>
+#include <sys/fbdev.h>
+#include <os/kalloc.h>
+#include <os/module.h>
+#include <os/ns.h>
 #include <io/video/fbdev.h>
 #include <vm/map.h>
 #include <vm/mmu.h>
 
+static struct fb_info info;
+
 /*
  * Map the framebuffer, we'll decided how many bytes
  * is mapped.
@@ -80,6 +87,39 @@ fbdev_map(struct mac_border *mbp, struct mac_map_args *args)
     return args->len;
 }
 
+static int
+fbdev_init(struct module *modp)
+{
+    struct bootvar_fb *fbvar;
+    struct bootvars bv;
+    struct ns_obj *obj;
+    int error;
+
+    obj = kalloc(sizeof(*obj));
+    if (obj == NULL) {
+        return -EINVAL;
+    }
+
+    /* Grab the bootvars */
+    error = bootvars_read(&bv, 0);
+    if (error < 0) {
+        return error;
+    }
+
+    fbvar = &bv.fbvars;
+    info.width = fbvar->width;
+    info.height = fbvar->height;
+    info.pitch = fbvar->pitch;
+
+    /* Initialize the object */
+    if ((error = ns_obj_init(obj)) < 0) {
+        return error;
+    }
+
+    obj->data = &info;
+    return ns_obj_enter(0, obj, FBDEV_NSO);
+}
+
 static struct mac_ops ops = {
     .map = fbdev_map,
     .sync = NULL,
@@ -90,3 +130,5 @@ struct mac_border g_fbdev_border = {
     .level = MAC_RESTRICTED,
     .ops = &ops
 };
+
+MODULE_EXPORT("fbdev", MODTYPE_GENERIC, fbdev_init);