From ffa5a3c2dd4eb887821699ba434cbb6eb93b23b8 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 19 May 2025 01:01:11 -0400
Subject: kernel: syscall: Add SYS_reboot syscall

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/reboot.c | 10 ++++++++++
 sys/include/sys/reboot.h      |  4 +++-
 sys/include/sys/syscall.h     |  1 +
 sys/kern/kern_syscall.c       |  2 ++
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/sys/arch/amd64/amd64/reboot.c b/sys/arch/amd64/amd64/reboot.c
index 64db09e..d47a352 100644
--- a/sys/arch/amd64/amd64/reboot.c
+++ b/sys/arch/amd64/amd64/reboot.c
@@ -50,3 +50,13 @@ cpu_reboot(int method)
         outb(0x64, 0xFE);
     }
 }
+
+/*
+ * arg0: Method bits
+ */
+scret_t
+sys_reboot(struct syscall_args *scargs)
+{
+    cpu_reboot(scargs->arg0);
+    __builtin_unreachable();
+}
diff --git a/sys/include/sys/reboot.h b/sys/include/sys/reboot.h
index eeb55f8..846073d 100644
--- a/sys/include/sys/reboot.h
+++ b/sys/include/sys/reboot.h
@@ -32,13 +32,15 @@
 
 #include <sys/param.h>
 #include <sys/cdefs.h>
+#include <sys/syscall.h>
 
-#if defined(_KERNEL)
 #define REBOOT_RESET    0x00000000
 #define REBOOT_HALT     BIT(0)  /* Halt instead of rebooting */
 #define REBOOT_POWEROFF BIT(1)  /* Power off (needs REBOOT_HALT set too) */
 
 void cpu_reboot(int method);
 
+#if defined(_KERNEL)
+scret_t sys_reboot(struct syscall_args *scargs);
 #endif  /* _KERNEL */
 #endif  /* _SYS_REBOOT_H_ */
diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index 16c4b17..2223a96 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -47,6 +47,7 @@
 #define SYS_sysctl  6
 #define SYS_write   7
 #define SYS_spawn   8
+#define SYS_reboot  9
 
 #if defined(_KERNEL)
 /* Syscall return value and arg type */
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c
index bc61fa6..249a04a 100644
--- a/sys/kern/kern_syscall.c
+++ b/sys/kern/kern_syscall.c
@@ -29,6 +29,7 @@
 
 #include <sys/syscall.h>
 #include <sys/sysctl.h>
+#include <sys/reboot.h>
 #include <sys/types.h>
 #include <sys/proc.h>
 #include <sys/vfs.h>
@@ -43,6 +44,7 @@ scret_t(*g_sctab[])(struct syscall_args *) = {
     sys_sysctl, /* SYS_sysctl */
     sys_write,  /* SYS_write */
     sys_spawn,  /* SYS_spawn */
+    sys_reboot, /* SYS_reboot */
 };
 
 const size_t MAX_SYSCALLS = NELEM(g_sctab);
-- 
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