kern/shutdown: new module

1 files changed, 111 insertions, 0 deletions

diff --git a/kern/shutdown.c b/kern/shutdown.c
new file mode 100644
index 00000000..11a51832
--- /dev/null
+++ b/kern/shutdown.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2017 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+
+#include <kern/init.h>
+#include <kern/plist.h>
+#include <kern/shell.h>
+#include <kern/shutdown.h>
+#include <machine/cpu.h>
+
+static struct plist shutdown_ops_list;
+
+#ifdef X15_SHELL
+
+static void
+shutdown_shell_halt(int argc, char **argv)
+{
+    (void)argc;
+    (void)argv;
+
+    shutdown_halt();
+}
+
+static void
+shutdown_shell_reboot(int argc, char **argv)
+{
+    (void)argc;
+    (void)argv;
+
+    shutdown_reboot();
+}
+
+static struct shell_cmd shutdown_shell_cmds[] = {
+    SHELL_CMD_INITIALIZER("shutdown_halt", shutdown_shell_halt,
+        "shutdown_halt",
+        "halt the system"),
+    SHELL_CMD_INITIALIZER("shutdown_reboot", shutdown_shell_reboot,
+        "shutdown_reboot",
+        "reboot the system"),
+};
+
+#endif /* X15_SHELL */
+
+void __init
+shutdown_setup(void)
+{
+    plist_init(&shutdown_ops_list);
+}
+
+void __init
+shutdown_register_shell_cmds(void)
+{
+    SHELL_REGISTER_CMDS(shutdown_shell_cmds);
+}
+
+void __init
+shutdown_register(struct shutdown_ops *ops, unsigned int priority)
+{
+    plist_node_init(&ops->node, priority);
+    plist_add(&shutdown_ops_list, &ops->node);
+}
+
+static void
+shutdown_halt_other_cpus(void)
+{
+    cpu_intr_disable();
+    cpu_halt_broadcast();
+}
+
+void
+shutdown_halt(void)
+{
+    shutdown_halt_other_cpus();
+    printf("shutdown: system halted\n");
+    cpu_halt();
+}
+
+void
+shutdown_reboot(void)
+{
+    struct shutdown_ops *ops;
+
+    if (plist_empty(&shutdown_ops_list)) {
+        printf("shutdown: no reset operation available, halting\n");
+        shutdown_halt();
+    }
+
+    shutdown_halt_other_cpus();
+    printf("shutdown: rebooting...\n");
+
+    plist_for_each_entry_reverse(&shutdown_ops_list, ops, node) {
+        ops->reset();
+    }
+
+    cpu_halt();
+}