kernel: Add driver subsystem

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

2 files changed, 60 insertions, 0 deletions

diff --git a/sys/include/sys/driver.h b/sys/include/sys/driver.h
new file mode 100644
index 0000000..415f4e2
--- /dev/null
+++ b/sys/include/sys/driver.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2023-2024 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.
+ */
+
+#ifndef _SYS_DRIVER_H_
+#define _SYS_DRIVER_H_
+
+#include <sys/cdefs.h>
+
+#if defined(_KERNEL)
+
+struct driver {
+    int(*init)(void);
+};
+
+extern char __drivers_init_start[];
+extern char __drivers_init_end[];
+
+#define DRIVER_EXPORT(INIT)                         \
+    __attribute__((used, section(".drivers")))      \
+    static struct driver __driver_desc = {          \
+        .init = INIT,                               \
+    }
+
+#define DRIVERS_INIT() \
+    for (struct driver *__d = (struct driver *)__drivers_init_start;    \
+         (uintptr_t)__d < (uintptr_t)__drivers_init_end; ++__d)         \
+    {                                                                   \
+        __d->init();                                                    \
+    }
+#endif
+#endif  /* !_SYS_DRIVER_H_ */
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index c55ece2..c78d401 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -33,6 +33,7 @@
 #include <sys/timer.h>
 #include <sys/sched.h>
 #include <sys/vfs.h>
+#include <sys/driver.h>
 #include <machine/cpu_mp.h>
 #include <firmware/acpi/acpi.h>
 #include <vm/physseg.h>
@@ -92,6 +93,8 @@ main(void)
 
     vfs_init();
 
+    DRIVERS_INIT();
+
     sched_init();
     ci = this_cpu();