94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/console.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/irqflags.h>
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#include <linux/printk.h>
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#include <asm/setup.h>
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#include <hv/hypervisor.h>
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static void early_hv_write(struct console *con, const char *s, unsigned n)
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{
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hv_console_write((HV_VirtAddr) s, n);
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}
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static struct console early_hv_console = {
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.name = "earlyhv",
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.write = early_hv_write,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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/* Direct interface for emergencies */
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static int early_console_complete;
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void early_panic(const char *fmt, ...)
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{
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va_list ap;
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arch_local_irq_disable_all();
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va_start(ap, fmt);
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early_printk("Kernel panic - not syncing: ");
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early_vprintk(fmt, ap);
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early_console->write(early_console, "\n", 1);
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va_end(ap);
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dump_stack();
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hv_halt();
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}
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static int __initdata keep_early;
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static int __init setup_early_printk(char *str)
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{
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if (early_console)
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return 1;
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if (str != NULL && strncmp(str, "keep", 4) == 0)
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keep_early = 1;
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early_console = &early_hv_console;
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register_console(early_console);
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return 0;
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}
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void __init disable_early_printk(void)
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{
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early_console_complete = 1;
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if (!early_console)
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return;
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if (!keep_early) {
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early_printk("disabling early console\n");
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unregister_console(early_console);
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early_console = NULL;
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} else {
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early_printk("keeping early console\n");
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}
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}
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void warn_early_printk(void)
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{
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if (early_console_complete || early_console)
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return;
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early_printk("\
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Machine shutting down before console output is fully initialized.\n\
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You may wish to reboot and add the option 'earlyprintk' to your\n\
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boot command line to see any diagnostic early console output.\n\
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");
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}
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early_param("earlyprintk", setup_early_printk);
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