kern: Add initial usleep system callHEADmaster

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

1 files changed, 51 insertions, 0 deletions

diff --git a/src/sys/os/os_sleep.c b/src/sys/os/os_sleep.c
new file mode 100644
index 0000000..a75ca25
--- /dev/null
+++ b/src/sys/os/os_sleep.c
@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+#include <sys/syscall.h>
+#include <sys/errno.h>
+#include <sys/cdefs.h>
+#include <os/clkdev.h>
+#include <os/sleep.h>
+
+static struct clkdev *clk = NULL;
+
+scret_t
+sys_usleep(struct syscall_args *scargs)
+{
+    uint32_t usec = SCARG(scargs, uint32_t, 0);
+
+    if (clk == NULL)
+        clkdev_get(CLKDEV_GET_USEC | CLKDEV_MSLEEP, &clk);
+    if (__unlikely(clk == NULL))
+        return -EIO;
+
+    /* TODO: Suspend the calling thread */
+    clk->usleep(usec);
+    return 0;
+}