projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 867e359b CM |
1 | /* |
| 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or | |
| 5 | * modify it under the terms of the GNU General Public License | |
| 6 | * as published by the Free Software Foundation, version 2. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, but | |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for | |
| 12 | * more details. | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/console.h> | |
| 16 | #include <linux/kernel.h> | |
| 17 | #include <linux/init.h> | |
| 18 | #include <linux/string.h> | |
| bd119c69 | 19 | #include <linux/irqflags.h> |
| 867e359b CM |
20 | #include <asm/setup.h> |
| 21 | #include <hv/hypervisor.h> | |
| 22 | ||
| 23 | static void early_hv_write(struct console *con, const char *s, unsigned n) | |
| 24 | { | |
| 25 | hv_console_write((HV_VirtAddr) s, n); | |
| 26 | } | |
| 27 | ||
| 28 | static struct console early_hv_console = { | |
| 29 | .name = "earlyhv", | |
| 30 | .write = early_hv_write, | |
| 31 | .flags = CON_PRINTBUFFER, | |
| 32 | .index = -1, | |
| 33 | }; | |
| 34 | ||
| 35 | /* Direct interface for emergencies */ | |
| 0707ad30 | 36 | static struct console *early_console = &early_hv_console; |
| 867e359b CM |
37 | static int early_console_initialized; |
| 38 | static int early_console_complete; | |
| 39 | ||
| 40 | static void early_vprintk(const char *fmt, va_list ap) | |
| 41 | { | |
| 42 | char buf[512]; | |
| 43 | int n = vscnprintf(buf, sizeof(buf), fmt, ap); | |
| 44 | early_console->write(early_console, buf, n); | |
| 45 | } | |
| 46 | ||
| 47 | void early_printk(const char *fmt, ...) | |
| 48 | { | |
| 49 | va_list ap; | |
| 50 | va_start(ap, fmt); | |
| 51 | early_vprintk(fmt, ap); | |
| 52 | va_end(ap); | |
| 53 | } | |
| 54 | ||
| 55 | void early_panic(const char *fmt, ...) | |
| 56 | { | |
| 57 | va_list ap; | |
| 5d966115 | 58 | arch_local_irq_disable_all(); |
| 867e359b CM |
59 | va_start(ap, fmt); |
| 60 | early_printk("Kernel panic - not syncing: "); | |
| 61 | early_vprintk(fmt, ap); | |
| 62 | early_console->write(early_console, "\n", 1); | |
| 63 | va_end(ap); | |
| 64 | dump_stack(); | |
| 65 | hv_halt(); | |
| 66 | } | |
| 67 | ||
| 68 | static int __initdata keep_early; | |
| 69 | ||
| 70 | static int __init setup_early_printk(char *str) | |
| 71 | { | |
| 72 | if (early_console_initialized) | |
| 73 | return 1; | |
| 74 | ||
| 75 | if (str != NULL && strncmp(str, "keep", 4) == 0) | |
| 76 | keep_early = 1; | |
| 77 | ||
| 78 | early_console = &early_hv_console; | |
| 79 | early_console_initialized = 1; | |
| 80 | register_console(early_console); | |
| 81 | ||
| 82 | return 0; | |
| 83 | } | |
| 84 | ||
| 85 | void __init disable_early_printk(void) | |
| 86 | { | |
| 87 | early_console_complete = 1; | |
| 88 | if (!early_console_initialized || !early_console) | |
| 89 | return; | |
| 90 | if (!keep_early) { | |
| 91 | early_printk("disabling early console\n"); | |
| 92 | unregister_console(early_console); | |
| 93 | early_console_initialized = 0; | |
| 94 | } else { | |
| 95 | early_printk("keeping early console\n"); | |
| 96 | } | |
| 97 | } | |
| 98 | ||
| 99 | void warn_early_printk(void) | |
| 100 | { | |
| 101 | if (early_console_complete || early_console_initialized) | |
| 102 | return; | |
| 103 | early_printk("\ | |
| 104 | Machine shutting down before console output is fully initialized.\n\ | |
| 105 | You may wish to reboot and add the option 'earlyprintk' to your\n\ | |
| 106 | boot command line to see any diagnostic early console output.\n\ | |
| 107 | "); | |
| 108 | } | |
| 109 | ||
| 110 | early_param("earlyprintk", setup_early_printk); |