kern/amd64: Add panic function + MU helpers

This commit introduces a panic function as well as a panic machine
unifier layer for MD specifics that help bring the system to a halt.

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

1 files changed, 53 insertions, 0 deletions

diff --git a/sys/kern/kern_panic.c b/sys/kern/kern_panic.c
new file mode 100644
index 0000000..d6beccb
--- /dev/null
+++ b/sys/kern/kern_panic.c
@@ -0,0 +1,53 @@
+/*
+ * 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 PURPKERNE
+ * 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; LKERNS 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
+ * PKERNSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <kern/panic.h>
+#include <kern/serial.h>
+#include <mu/panic.h>
+#include <lib/string.h>
+#include <lib/stdarg.h>
+#include <lib/stdbool.h>
+
+void
+panic(const char *fmt, ...)
+{
+    static bool lock = false;
+    static char buf[256];
+    static va_list ap;
+
+    mu_panic_preamble();
+    va_start(ap, fmt);
+
+    vsnprintf(buf, sizeof(buf), fmt, ap);
+    serial_write("panic: ", 7);
+    serial_write(buf, strlen(buf));
+
+    mu_panic_hcf();
+    __builtin_unreachable();
+}