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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/kmsg_dump.h>
- #include <linux/spinlock.h>
- #include <linux/console.h>
- #include <linux/string.h>
- #include <shared/init.h>
- #include <shared/kern.h>
- #include <os.h>
- static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason)
- {
- static struct kmsg_dump_iter iter;
- static DEFINE_SPINLOCK(lock);
- static char line[1024];
- struct console *con;
- unsigned long flags;
- size_t len = 0;
- /* only dump kmsg when no console is available */
- if (!console_trylock())
- return;
- for_each_console(con) {
- if(strcmp(con->name, "tty") == 0 &&
- (con->flags & (CON_ENABLED | CON_CONSDEV)) != 0) {
- break;
- }
- }
- console_unlock();
- if (con)
- return;
- if (!spin_trylock_irqsave(&lock, flags))
- return;
- kmsg_dump_rewind(&iter);
- printf("kmsg_dump:\n");
- while (kmsg_dump_get_line(&iter, true, line, sizeof(line), &len)) {
- line[len] = '\0';
- printf("%s", line);
- }
- spin_unlock_irqrestore(&lock, flags);
- }
- static struct kmsg_dumper kmsg_dumper = {
- .dump = kmsg_dumper_stdout
- };
- int __init kmsg_dumper_stdout_init(void)
- {
- return kmsg_dump_register(&kmsg_dumper);
- }
- __uml_postsetup(kmsg_dumper_stdout_init);
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