kernel: Add ioctl support

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

5 files changed, 79 insertions, 1 deletions

diff --git a/sys/include/sys/device.h b/sys/include/sys/device.h
index a3ce983..9851ee2 100644
--- a/sys/include/sys/device.h
+++ b/sys/include/sys/device.h
@@ -41,6 +41,7 @@ struct device {
     size_t blocksize;
     int(*write)(struct device *dev, struct sio_txn *sio);
     int(*read)(struct device *dev, struct sio_txn *sio);
+    int(*ioctl)(struct device *dev, uint32_t cmd, uintptr_t arg);
     paddr_t(*mmap)(struct device *dev, off_t off, vm_prot_t prot);
     TAILQ_ENTRY(device) link;
 };
diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index 59b6036..0f5abf0 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -45,6 +45,7 @@ enum {
     SYS_lseek,
     SYS_mmap,
     SYS_munmap,
+    SYS_ioctl,
     __MAX_SYSCALLS
 };
 
diff --git a/sys/include/sys/system.h b/sys/include/sys/system.h
index c2e47c2..03ac710 100644
--- a/sys/include/sys/system.h
+++ b/sys/include/sys/system.h
@@ -31,11 +31,13 @@
 #define _SYS_SYSTEM_H_
 
 #include <sys/types.h>
+#include <sys/syscall.h>
 
 #if defined(_KERNEL)
 int copyin(uintptr_t uaddr, void *kaddr, size_t len);
 int copyout(const void *kaddr, uintptr_t uaddr, size_t len);
 int copyinstr(uintptr_t uaddr, char *kaddr, size_t len);
+uint64_t sys_ioctl(struct syscall_args *args);
 #endif
 
 #endif  /* !_SYS_SYSTEM_H_ */
diff --git a/sys/kern/kern_ioctl.c b/sys/kern/kern_ioctl.c
new file mode 100644
index 0000000..4b81983
--- /dev/null
+++ b/sys/kern/kern_ioctl.c
@@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+#include <sys/system.h>
+#include <sys/vnode.h>
+#include <sys/filedesc.h>
+#include <sys/syscall.h>
+#include <sys/errno.h>
+#include <sys/sched.h>
+#include <fs/devfs.h>
+
+static int
+do_ioctl(int fd, uint32_t cmd, uintptr_t arg)
+{
+    struct proc *td = this_td();
+    struct filedesc *filedes;
+    struct vnode *vp;
+    struct device *dev;
+    int status;
+
+    filedes = fd_from_fdnum(td, fd);
+
+    /* Fetch the vnode */
+    if (filedes == NULL)
+        return -EBADF;
+    if ((vp = filedes->vnode) == NULL)
+        return -EIO;
+
+    if ((status = devfs_get_dev(vp, &dev)) != 0)
+        return status;
+    if (dev->ioctl == NULL)
+        return -EIO;
+
+    return dev->ioctl(dev, cmd, arg);
+}
+
+/*
+ * Arg0: Fd.
+ * Arg1: Cmd.
+ * Arg2: Arg.
+ */
+uint64_t
+sys_ioctl(struct syscall_args *args)
+{
+    return do_ioctl(args->arg0, args->arg1, args->arg2);
+}
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c
index b4a86f3..e892c39 100644
--- a/sys/kern/kern_syscall.c
+++ b/sys/kern/kern_syscall.c
@@ -32,6 +32,7 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <sys/filedesc.h>
+#include <sys/system.h>
 #include <vm/map.h>
 
 __noreturn static uint64_t
@@ -49,5 +50,6 @@ uint64_t(*g_syscall_table[__MAX_SYSCALLS])(struct syscall_args *args) = {
     sys_read,
     sys_lseek,
     sys_mmap,
-    sys_munmap
+    sys_munmap,
+    sys_ioctl,
 };