kern: proc: Add enhanced processor arbitration

Unlike the previouses systems where there was a global arbiter and a
shared lock, rv7 derives a zero-based processor index by using the lower
8 bits of the pid MOD the core count. This significantly reduces
contention.

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

1 files changed, 43 insertions, 0 deletions

diff --git a/sys/inc/os/sched.h b/sys/inc/os/sched.h
new file mode 100644
index 0000000..c0355c6
--- /dev/null
+++ b/sys/inc/os/sched.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 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.
+ */
+
+#ifndef _OS_SCHED_H_
+#define _OS_SCHED_H_
+
+#include <sys/types.h>
+#include <os/process.h>
+#include <mu/cpu.h>
+
+/*
+ * Enqueue a process into a runqueue and return the processor
+ * now associated
+ */
+struct cpu_info *sched_enqueue_proc(struct process *proc);
+
+#endif  /* !_OS_SCHED_H_ */