diff options
Diffstat (limited to 'xenolinux-2.4.24-sparse/kernel')
| -rw-r--r-- | xenolinux-2.4.24-sparse/kernel/panic.c | 157 | ||||
| -rw-r--r-- | xenolinux-2.4.24-sparse/kernel/printk.c | 703 | ||||
| -rw-r--r-- | xenolinux-2.4.24-sparse/kernel/time.c | 415 |
3 files changed, 1275 insertions, 0 deletions
diff --git a/xenolinux-2.4.24-sparse/kernel/panic.c b/xenolinux-2.4.24-sparse/kernel/panic.c new file mode 100644 index 0000000000..871ea67fee --- /dev/null +++ b/xenolinux-2.4.24-sparse/kernel/panic.c @@ -0,0 +1,157 @@ +/* + * linux/kernel/panic.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +/* + * This function is used through-out the kernel (including mm and fs) + * to indicate a major problem. + */ +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/reboot.h> +#include <linux/notifier.h> +#include <linux/init.h> +#include <linux/sysrq.h> +#include <linux/interrupt.h> +#include <linux/console.h> + +asmlinkage void sys_sync(void); /* it's really int */ + +int panic_timeout; + +struct notifier_block *panic_notifier_list; + +static int __init panic_setup(char *str) +{ + panic_timeout = simple_strtoul(str, NULL, 0); + return 1; +} + +__setup("panic=", panic_setup); + +int machine_paniced; + +/** + * panic - halt the system + * @fmt: The text string to print + * + * Display a message, then perform cleanups. Functions in the panic + * notifier list are called after the filesystem cache is flushed (when possible). + * + * This function never returns. + */ + +NORET_TYPE void panic(const char * fmt, ...) +{ + static char buf[1024]; + va_list args; +#if defined(CONFIG_ARCH_S390) + unsigned long caller = (unsigned long) __builtin_return_address(0); +#endif + +#ifdef CONFIG_VT + disable_console_blank(); +#endif + machine_paniced = 1; + + bust_spinlocks(1); + va_start(args, fmt); + vsprintf(buf, fmt, args); + va_end(args); + printk(KERN_EMERG "Kernel panic: %s\n",buf); + if (in_interrupt()) + printk(KERN_EMERG "In interrupt handler - not syncing\n"); + else if (!current->pid) + printk(KERN_EMERG "In idle task - not syncing\n"); + else + sys_sync(); + bust_spinlocks(0); + +#ifdef CONFIG_SMP + smp_send_stop(); +#endif + + notifier_call_chain(&panic_notifier_list, 0, NULL); + + if (panic_timeout > 0) + { + /* + * Delay timeout seconds before rebooting the machine. + * We can't use the "normal" timers since we just panicked.. + */ + printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout); + mdelay(panic_timeout*1000); + /* + * Should we run the reboot notifier. For the moment Im + * choosing not too. It might crash, be corrupt or do + * more harm than good for other reasons. + */ + machine_restart(NULL); + } +#ifdef __sparc__ + { + extern int stop_a_enabled; + /* Make sure the user can actually press L1-A */ + stop_a_enabled = 1; + printk("Press L1-A to return to the boot prom\n"); + } +#endif +#if defined(CONFIG_ARCH_S390) + disabled_wait(caller); +#endif + sti(); + for(;;) { +#if defined(CONFIG_X86) && defined(CONFIG_VT) + extern void panic_blink(void); + panic_blink(); +#endif + CHECK_EMERGENCY_SYNC +#if defined(CONFIG_XENO) + HYPERVISOR_exit(); +#endif + } +} + +/** + * print_tainted - return a string to represent the kernel taint state. + * + * The string is overwritten by the next call to print_taint(). + */ + +const char *print_tainted() +{ + static char buf[20]; + if (tainted) { + snprintf(buf, sizeof(buf), "Tainted: %c%c", + tainted & 1 ? 'P' : 'G', + tainted & 2 ? 'F' : ' '); + } + else + snprintf(buf, sizeof(buf), "Not tainted"); + return(buf); +} + +int tainted = 0; + +/* + * A BUG() call in an inline function in a header should be avoided, + * because it can seriously bloat the kernel. So here we have + * helper functions. + * We lose the BUG()-time file-and-line info this way, but it's + * usually not very useful from an inline anyway. The backtrace + * tells us what we want to know. + */ + +void __out_of_line_bug(int line) +{ + printk("kernel BUG in header file at line %d\n", line); + + BUG(); + + /* Satisfy __attribute__((noreturn)) */ + for ( ; ; ) + ; +} diff --git a/xenolinux-2.4.24-sparse/kernel/printk.c b/xenolinux-2.4.24-sparse/kernel/printk.c new file mode 100644 index 0000000000..6cfedd9c02 --- /dev/null +++ b/xenolinux-2.4.24-sparse/kernel/printk.c @@ -0,0 +1,703 @@ +/* + * linux/kernel/printk.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Modified to make sys_syslog() more flexible: added commands to + * return the last 4k of kernel messages, regardless of whether + * they've been read or not. Added option to suppress kernel printk's + * to the console. Added hook for sending the console messages + * elsewhere, in preparation for a serial line console (someday). + * Ted Ts'o, 2/11/93. + * Modified for sysctl support, 1/8/97, Chris Horn. + * Fixed SMP synchronization, 08/08/99, Manfred Spraul + * manfreds@colorfullife.com + * Rewrote bits to get rid of console_lock + * 01Mar01 Andrew Morton <andrewm@uow.edu.au> + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/tty.h> +#include <linux/tty_driver.h> +#include <linux/smp_lock.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/interrupt.h> /* For in_interrupt() */ +#include <linux/config.h> + +#include <asm/uaccess.h> + +#if !defined(CONFIG_LOG_BUF_SHIFT) || (CONFIG_LOG_BUF_SHIFT == 0) +#if defined(CONFIG_MULTIQUAD) || defined(CONFIG_IA64) +#define LOG_BUF_LEN (65536) +#elif defined(CONFIG_ARCH_S390) +#define LOG_BUF_LEN (131072) +#elif defined(CONFIG_SMP) +#define LOG_BUF_LEN (32768) +#else +#define LOG_BUF_LEN (16384) /* This must be a power of two */ +#endif +#else /* CONFIG_LOG_BUF_SHIFT */ +#define LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT) +#endif + +#define LOG_BUF_MASK (LOG_BUF_LEN-1) + +#ifndef arch_consoles_callable +#define arch_consoles_callable() (1) +#endif + +/* printk's without a loglevel use this.. */ +#define DEFAULT_MESSAGE_LOGLEVEL 4 /* KERN_WARNING */ + +/* We show everything that is MORE important than this.. */ +#define MINIMUM_CONSOLE_LOGLEVEL 1 /* Minimum loglevel we let people use */ +#define DEFAULT_CONSOLE_LOGLEVEL 7 /* anything MORE serious than KERN_DEBUG */ + +DECLARE_WAIT_QUEUE_HEAD(log_wait); + +int console_printk[4] = { + DEFAULT_CONSOLE_LOGLEVEL, /* console_loglevel */ + DEFAULT_MESSAGE_LOGLEVEL, /* default_message_loglevel */ + MINIMUM_CONSOLE_LOGLEVEL, /* minimum_console_loglevel */ + DEFAULT_CONSOLE_LOGLEVEL, /* default_console_loglevel */ +}; + +int oops_in_progress; + +/* + * console_sem protects the console_drivers list, and also + * provides serialisation for access to the entire console + * driver system. + */ +static DECLARE_MUTEX(console_sem); +struct console *console_drivers; + +/* + * logbuf_lock protects log_buf, log_start, log_end, con_start and logged_chars + * It is also used in interesting ways to provide interlocking in + * release_console_sem(). + */ +static spinlock_t logbuf_lock = SPIN_LOCK_UNLOCKED; + +static char log_buf[LOG_BUF_LEN]; +#define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK]) + +/* + * The indices into log_buf are not constrained to LOG_BUF_LEN - they + * must be masked before subscripting + */ +static unsigned long log_start; /* Index into log_buf: next char to be read by syslog() */ +static unsigned long con_start; /* Index into log_buf: next char to be sent to consoles */ +static unsigned long log_end; /* Index into log_buf: most-recently-written-char + 1 */ +static unsigned long logged_chars; /* Number of chars produced since last read+clear operation */ + +struct console_cmdline console_cmdline[MAX_CMDLINECONSOLES]; +static int preferred_console = -1; + +/* Flag: console code may call schedule() */ +static int console_may_schedule; + +/* + * Setup a list of consoles. Called from init/main.c + */ +static int __init console_setup(char *str) +{ + struct console_cmdline *c; + char name[sizeof(c->name)]; + char *s, *options; + int i, idx; + + /* + * Decode str into name, index, options. + */ + if (str[0] >= '0' && str[0] <= '9') { + strcpy(name, "ttyS"); + strncpy(name + 4, str, sizeof(name) - 5); + } else + strncpy(name, str, sizeof(name) - 1); + name[sizeof(name) - 1] = 0; + if ((options = strchr(str, ',')) != NULL) + *(options++) = 0; +#ifdef __sparc__ + if (!strcmp(str, "ttya")) + strcpy(name, "ttyS0"); + if (!strcmp(str, "ttyb")) + strcpy(name, "ttyS1"); +#endif + for(s = name; *s; s++) + if (*s >= '0' && *s <= '9') + break; + idx = simple_strtoul(s, NULL, 10); + *s = 0; + + /* + * See if this tty is not yet registered, and + * if we have a slot free. + */ + for(i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++) + if (strcmp(console_cmdline[i].name, name) == 0 && + console_cmdline[i].index == idx) { + preferred_console = i; + return 1; + } + if (i == MAX_CMDLINECONSOLES) + return 1; + preferred_console = i; + c = &console_cmdline[i]; + memcpy(c->name, name, sizeof(c->name)); + c->options = options; + c->index = idx; + return 1; +} + +__setup("console=", console_setup); + +/* + * Commands to do_syslog: + * + * 0 -- Close the log. Currently a NOP. + * 1 -- Open the log. Currently a NOP. + * 2 -- Read from the log. + * 3 -- Read all messages remaining in the ring buffer. + * 4 -- Read and clear all messages remaining in the ring buffer + * 5 -- Clear ring buffer. + * 6 -- Disable printk's to console + * 7 -- Enable printk's to console + * 8 -- Set level of messages printed to console + * 9 -- Return number of unread characters in the log buffer + */ +int do_syslog(int type, char * buf, int len) +{ + unsigned long i, j, limit, count; + int do_clear = 0; + char c; + int error = 0; + + switch (type) { + case 0: /* Close log */ + break; + case 1: /* Open log */ + break; + case 2: /* Read from log */ + error = -EINVAL; + if (!buf || len < 0) + goto out; + error = 0; + if (!len) + goto out; + error = verify_area(VERIFY_WRITE,buf,len); + if (error) + goto out; + error = wait_event_interruptible(log_wait, (log_start - log_end)); + if (error) + goto out; + i = 0; + spin_lock_irq(&logbuf_lock); + while ((log_start != log_end) && i < len) { + c = LOG_BUF(log_start); + log_start++; + spin_unlock_irq(&logbuf_lock); + __put_user(c,buf); + buf++; + i++; + spin_lock_irq(&logbuf_lock); + } + spin_unlock_irq(&logbuf_lock); + error = i; + break; + case 4: /* Read/clear last kernel messages */ + do_clear = 1; + /* FALL THRU */ + case 3: /* Read last kernel messages */ + error = -EINVAL; + if (!buf || len < 0) + goto out; + error = 0; + if (!len) + goto out; + error = verify_area(VERIFY_WRITE,buf,len); + if (error) + goto out; + count = len; + if (count > LOG_BUF_LEN) + count = LOG_BUF_LEN; + spin_lock_irq(&logbuf_lock); + if (count > logged_chars) + count = logged_chars; + if (do_clear) + logged_chars = 0; + limit = log_end; + /* + * __put_user() could sleep, and while we sleep + * printk() could overwrite the messages + * we try to copy to user space. Therefore + * the messages are copied in reverse. <manfreds> + */ + for(i=0;i < count;i++) { + j = limit-1-i; + if (j+LOG_BUF_LEN < log_end) + break; + c = LOG_BUF(j); + spin_unlock_irq(&logbuf_lock); + __put_user(c,&buf[count-1-i]); + spin_lock_irq(&logbuf_lock); + } + spin_unlock_irq(&logbuf_lock); + error = i; + if(i != count) { + int offset = count-error; + /* buffer overflow during copy, correct user buffer. */ + for(i=0;i<error;i++) { + __get_user(c,&buf[i+offset]); + __put_user(c,&buf[i]); + } + } + + break; + case 5: /* Clear ring buffer */ + spin_lock_irq(&logbuf_lock); + logged_chars = 0; + spin_unlock_irq(&logbuf_lock); + break; + case 6: /* Disable logging to console */ + spin_lock_irq(&logbuf_lock); + console_loglevel = minimum_console_loglevel; + spin_unlock_irq(&logbuf_lock); + break; + case 7: /* Enable logging to console */ + spin_lock_irq(&logbuf_lock); + console_loglevel = default_console_loglevel; + spin_unlock_irq(&logbuf_lock); + break; + case 8: /* Set level of messages printed to console */ + error = -EINVAL; + if (len < 1 || len > 8) + goto out; + if (len < minimum_console_loglevel) + len = minimum_console_loglevel; + spin_lock_irq(&logbuf_lock); + console_loglevel = len; + spin_unlock_irq(&logbuf_lock); + error = 0; + break; + case 9: /* Number of chars in the log buffer */ + spin_lock_irq(&logbuf_lock); + error = log_end - log_start; + spin_unlock_irq(&logbuf_lock); + break; + default: + error = -EINVAL; + break; + } +out: + return error; +} + +asmlinkage long sys_syslog(int type, char * buf, int len) +{ + if ((type != 3) && !capable(CAP_SYS_ADMIN)) + return -EPERM; + return do_syslog(type, buf, len); +} + +/* + * Call the console drivers on a range of log_buf + */ +static void __call_console_drivers(unsigned long start, unsigned long end) +{ + struct console *con; + + for (con = console_drivers; con; con = con->next) { + if ((con->flags & CON_ENABLED) && con->write) + con->write(con, &LOG_BUF(start), end - start); + } +} + +/* + * Write out chars from start to end - 1 inclusive + */ +static void _call_console_drivers(unsigned long start, unsigned long end, int msg_log_level) +{ + if (msg_log_level < console_loglevel && console_drivers && start != end) { + if ((start & LOG_BUF_MASK) > (end & LOG_BUF_MASK)) { + /* wrapped write */ + __call_console_drivers(start & LOG_BUF_MASK, LOG_BUF_LEN); + __call_console_drivers(0, end & LOG_BUF_MASK); + } else { + __call_console_drivers(start, end); + } + } +} + +/* + * Call the console drivers, asking them to write out + * log_buf[start] to log_buf[end - 1]. + * The console_sem must be held. + */ +static void call_console_drivers(unsigned long start, unsigned long end) +{ + unsigned long cur_index, start_print; + static int msg_level = -1; + + if (((long)(start - end)) > 0) + BUG(); + + cur_index = start; + start_print = start; + while (cur_index != end) { + if ( msg_level < 0 && + ((end - cur_index) > 2) && + LOG_BUF(cur_index + 0) == '<' && + LOG_BUF(cur_index + 1) >= '0' && + LOG_BUF(cur_index + 1) <= '7' && + LOG_BUF(cur_index + 2) == '>') + { + msg_level = LOG_BUF(cur_index + 1) - '0'; + cur_index += 3; + start_print = cur_index; + } + while (cur_index != end) { + char c = LOG_BUF(cur_index); + cur_index++; + + if (c == '\n') { + if (msg_level < 0) { + /* + * printk() has already given us loglevel tags in + * the buffer. This code is here in case the + * log buffer has wrapped right round and scribbled + * on those tags + */ + msg_level = default_message_loglevel; + } + _call_console_drivers(start_print, cur_index, msg_level); + msg_level = -1; + start_print = cur_index; + break; + } + } + } + _call_console_drivers(start_print, end, msg_level); +} + +static void emit_log_char(char c) +{ + LOG_BUF(log_end) = c; + log_end++; + if (log_end - log_start > LOG_BUF_LEN) + log_start = log_end - LOG_BUF_LEN; + if (log_end - con_start > LOG_BUF_LEN) + con_start = log_end - LOG_BUF_LEN; + if (logged_chars < LOG_BUF_LEN) + logged_chars++; +} + +/* + * This is printk. It can be called from any context. We want it to work. + * + * We try to grab the console_sem. If we succeed, it's easy - we log the output and + * call the console drivers. If we fail to get the semaphore we place the output + * into the log buffer and return. The current holder of the console_sem will + * notice the new output in release_console_sem() and will send it to the + * consoles before releasing the semaphore. + * + * One effect of this deferred printing is that code which calls printk() and + * then changes console_loglevel may break. This is because console_loglevel + * is inspected when the actual printing occurs. + */ +asmlinkage int printk(const char *fmt, ...) +{ + va_list args; + unsigned long flags; + int printed_len; + char *p; + static char printk_buf[1024]; + static int log_level_unknown = 1; + + if (oops_in_progress) { + /* If a crash is occurring, make sure we can't deadlock */ + spin_lock_init(&logbuf_lock); + /* And make sure that we print immediately */ + init_MUTEX(&console_sem); + } + + /* This stops the holder of console_sem just where we want him */ + spin_lock_irqsave(&logbuf_lock, flags); + + /* Emit the output into the temporary buffer */ + va_start(args, fmt); + printed_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args); + va_end(args); + +#if 0 + /* Useful if things are going wrong very early in the day. */ + (void)HYPERVISOR_console_write(printk_buf, printed_len); +#endif + + /* + * Copy the output into log_buf. If the caller didn't provide + * appropriate log level tags, we insert them here + */ + for (p = printk_buf; *p; p++) { + if (log_level_unknown) { + if (p[0] != '<' || p[1] < '0' || p[1] > '7' || p[2] != '>') { + emit_log_char('<'); + emit_log_char(default_message_loglevel + '0'); + emit_log_char('>'); + } + log_level_unknown = 0; + } + emit_log_char(*p); + if (*p == '\n') + log_level_unknown = 1; + } + + if (!arch_consoles_callable()) { + /* + * On some architectures, the consoles are not usable + * on secondary CPUs early in the boot process. + */ + spin_unlock_irqrestore(&logbuf_lock, flags); + goto out; + } + if (!down_trylock(&console_sem)) { + /* + * We own the drivers. We can drop the spinlock and let + * release_console_sem() print the text + */ + spin_unlock_irqrestore(&logbuf_lock, flags); + console_may_schedule = 0; + release_console_sem(); + } else { + /* + * Someone else owns the drivers. We drop the spinlock, which + * allows the semaphore holder to proceed and to call the + * console drivers with the output which we just produced. + */ + spin_unlock_irqrestore(&logbuf_lock, flags); + } +out: + return printed_len; +} +EXPORT_SYMBOL(printk); + +/** + * acquire_console_sem - lock the console system for exclusive use. + * + * Acquires a semaphore which guarantees that the caller has + * exclusive access to the console system and the console_drivers list. + * + * Can sleep, returns nothing. + */ +void acquire_console_sem(void) +{ + if (in_interrupt()) + BUG(); + down(&console_sem); + console_may_schedule = 1; +} +EXPORT_SYMBOL(acquire_console_sem); + +/** + * release_console_sem - unlock the console system + * + * Releases the semaphore which the caller holds on the console system + * and the console driver list. + * + * While the semaphore was held, console output may have been buffered + * by printk(). If this is the case, release_console_sem() emits + * the output prior to releasing the semaphore. + * + * If there is output waiting for klogd, we wake it up. + * + * release_console_sem() may be called from any context. + */ +void release_console_sem(void) +{ + unsigned long flags; + unsigned long _con_start, _log_end; + unsigned long must_wake_klogd = 0; + + for ( ; ; ) { + spin_lock_irqsave(&logbuf_lock, flags); + must_wake_klogd |= log_start - log_end; + if (con_start == log_end) + break; /* Nothing to print */ + _con_start = con_start; + _log_end = log_end; + con_start = log_end; /* Flush */ + spin_unlock_irqrestore(&logbuf_lock, flags); + call_console_drivers(_con_start, _log_end); + } + console_may_schedule = 0; + up(&console_sem); + spin_unlock_irqrestore(&logbuf_lock, flags); + if (must_wake_klogd && !oops_in_progress) + wake_up_interruptible(&log_wait); +} + +/** console_conditional_schedule - yield the CPU if required + * + * If the console code is currently allowed to sleep, and + * if this CPU should yield the CPU to another task, do + * so here. + * + * Must be called within acquire_console_sem(). + */ +void console_conditional_schedule(void) +{ + if (console_may_schedule && current->need_resched) { + set_current_state(TASK_RUNNING); + schedule(); + } +} + +void console_print(const char *s) +{ + printk(KERN_EMERG "%s", s); +} +EXPORT_SYMBOL(console_print); + +void console_unblank(void) +{ + struct console *c; + + /* + * Try to get the console semaphore. If someone else owns it + * we have to return without unblanking because console_unblank + * may be called in interrupt context. + */ + if (down_trylock(&console_sem) != 0) + return; + console_may_schedule = 0; + for (c = console_drivers; c != NULL; c = c->next) + if ((c->flags & CON_ENABLED) && c->unblank) + c->unblank(); + release_console_sem(); +} +EXPORT_SYMBOL(console_unblank); + +/* + * The console driver calls this routine during kernel initialization + * to register the console printing procedure with printk() and to + * print any messages that were printed by the kernel before the + * console driver was initialized. + */ +void register_console(struct console * console) +{ + int i; + unsigned long flags; + + /* + * See if we want to use this console driver. If we + * didn't select a console we take the first one + * that registers here. + */ + if (preferred_console < 0) { + if (console->index < 0) + console->index = 0; + if (console->setup == NULL || + console->setup(console, NULL) == 0) { + console->flags |= CON_ENABLED | CON_CONSDEV; + preferred_console = 0; + } + } + + /* + * See if this console matches one we selected on + * the command line. + */ + for(i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++) { + if (strcmp(console_cmdline[i].name, console->name) != 0) + continue; + if (console->index >= 0 && + console->index != console_cmdline[i].index) + continue; + if (console->index < 0) + console->index = console_cmdline[i].index; + if (console->setup && + console->setup(console, console_cmdline[i].options) != 0) + break; + console->flags |= CON_ENABLED; + console->index = console_cmdline[i].index; + if (i == preferred_console) + console->flags |= CON_CONSDEV; + break; + } + + if (!(console->flags & CON_ENABLED)) + return; + + /* + * Put this console in the list - keep the + * preferred driver at the head of the list. + */ + acquire_console_sem(); + if ((console->flags & CON_CONSDEV) || console_drivers == NULL) { + console->next = console_drivers; + console_drivers = console; + } else { + console->next = console_drivers->next; + console_drivers->next = console; + } + if (console->flags & CON_PRINTBUFFER) { + /* + * release_console_sem() will print out the buffered messages for us. + */ + spin_lock_irqsave(&logbuf_lock, flags); + con_start = log_start; + spin_unlock_irqrestore(&logbuf_lock, flags); + } + release_console_sem(); +} +EXPORT_SYMBOL(register_console); + +int unregister_console(struct console * console) +{ + struct console *a,*b; + int res = 1; + + acquire_console_sem(); + if (console_drivers == console) { + console_drivers=console->next; + res = 0; + } else { + for (a=console_drivers->next, b=console_drivers ; + a; b=a, a=b->next) { + if (a == console) { + b->next = a->next; + res = 0; + break; + } + } + } + + /* If last console is removed, we re-enable picking the first + * one that gets registered. Without that, pmac early boot console + * would prevent fbcon from taking over. + */ + if (console_drivers == NULL) + preferred_console = -1; + + + release_console_sem(); + return res; +} +EXPORT_SYMBOL(unregister_console); + +/** + * tty_write_message - write a message to a certain tty, not just the console. + * + * This is used for messages that need to be redirected to a specific tty. + * We don't put it into the syslog queue right now maybe in the future if + * really needed. + */ +void tty_write_message(struct tty_struct *tty, char *msg) +{ + if (tty && tty->driver.write) + tty->driver.write(tty, 0, msg, strlen(msg)); + return; +} diff --git a/xenolinux-2.4.24-sparse/kernel/time.c b/xenolinux-2.4.24-sparse/kernel/time.c new file mode 100644 index 0000000000..fe6ecde6d8 --- /dev/null +++ b/xenolinux-2.4.24-sparse/kernel/time.c @@ -0,0 +1,415 @@ +/* + * linux/kernel/time.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * This file contains the interface functions for the various + * time related system calls: time, stime, gettimeofday, settimeofday, + * adjtime + */ +/* + * Modification history kernel/time.c + * + * 1993-09-02 Philip Gladstone + * Created file with time related functions from sched.c and adjtimex() + * 1993-10-08 Torsten Duwe + * adjtime interface update and CMOS clock write code + * 1995-08-13 Torsten Duwe + * kernel PLL updated to 1994-12-13 specs (rfc-1589) + * 1999-01-16 Ulrich Windl + * Introduced error checking for many cases in adjtimex(). + * Updated NTP code according to technical memorandum Jan '96 + * "A Kernel Model for Precision Timekeeping" by Dave Mills + * Allow time_constant larger than MAXTC(6) for NTP v4 (MAXTC == 10) + * (Even though the technical memorandum forbids it) + */ + +#include <linux/mm.h> +#include <linux/timex.h> +#include <linux/smp_lock.h> + +#include <asm/uaccess.h> + +/* + * The timezone where the local system is located. Used as a default by some + * programs who obtain this value by using gettimeofday. + */ +struct timezone sys_tz; + +/* The xtime_lock is not only serializing the xtime read/writes but it's also + serializing all accesses to the global NTP variables now. */ +extern rwlock_t xtime_lock; + +#if !defined(__alpha__) && !defined(__ia64__) + +/* + * sys_time() can be implemented in user-level using + * sys_gettimeofday(). Is this for backwards compatibility? If so, + * why not move it into the appropriate arch directory (for those + * architectures that need it). + * + * XXX This function is NOT 64-bit clean! + */ +asmlinkage long sys_time(int * tloc) +{ + struct timeval now; + int i; + + do_gettimeofday(&now); + i = now.tv_sec; + if (tloc) { + if (put_user(i,tloc)) + i = -EFAULT; + } + return i; +} + +#if !defined(CONFIG_XENO) + +/* + * sys_stime() can be implemented in user-level using + * sys_settimeofday(). Is this for backwards compatibility? If so, + * why not move it into the appropriate arch directory (for those + * architectures that need it). + */ + +asmlinkage long sys_stime(int * tptr) +{ + int value; + + if (!capable(CAP_SYS_TIME)) + return -EPERM; + if (get_user(value, tptr)) + return -EFAULT; + write_lock_irq(&xtime_lock); + vxtime_lock(); + xtime.tv_sec = value; + xtime.tv_usec = 0; + vxtime_unlock(); + time_adjust = 0; /* stop active adjtime() */ + time_status |= STA_UNSYNC; + time_maxerror = NTP_PHASE_LIMIT; + time_esterror = NTP_PHASE_LIMIT; + write_unlock_irq(&xtime_lock); + return 0; +} + +#endif + +#endif + +asmlinkage long sys_gettimeofday(struct timeval *tv, struct timezone *tz) +{ + if (tv) { + struct timeval ktv; + do_gettimeofday(&ktv); + if (copy_to_user(tv, &ktv, sizeof(ktv))) + return -EFAULT; + } + if (tz) { + if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) + return -EFAULT; + } + return 0; +} + +/* + * Adjust the time obtained from the CMOS to be UTC time instead of + * local time. + * + * This is ugly, but preferable to the alternatives. Otherwise we + * would either need to write a program to do it in /etc/rc (and risk + * confusion if the program gets run more than once; it would also be + * hard to make the program warp the clock precisely n hours) or + * compile in the timezone information into the kernel. Bad, bad.... + * + * - TYT, 1992-01-01 + * + * The best thing to do is to keep the CMOS clock in universal time (UTC) + * as real UNIX machines always do it. This avoids all headaches about + * daylight saving times and warping kernel clocks. + */ +inline static void warp_clock(void) +{ + write_lock_irq(&xtime_lock); + vxtime_lock(); + xtime.tv_sec += sys_tz.tz_minuteswest * 60; + vxtime_unlock(); + write_unlock_irq(&xtime_lock); +} + +/* + * In case for some reason the CMOS clock has not already been running + * in UTC, but in some local time: The first time we set the timezone, + * we will warp the clock so that it is ticking UTC time instead of + * local time. Presumably, if someone is setting the timezone then we + * are running in an environment where the programs understand about + * timezones. This should be done at boot time in the /etc/rc script, + * as soon as possible, so that the clock can be set right. Otherwise, + * various programs will get confused when the clock gets warped. + */ + +int do_sys_settimeofday(struct timeval *tv, struct timezone *tz) +{ + static int firsttime = 1; + + if (!capable(CAP_SYS_TIME)) + return -EPERM; + + if (tz) { + /* SMP safe, global irq locking makes it work. */ + sys_tz = *tz; + if (firsttime) { + firsttime = 0; + if (!tv) + warp_clock(); + } + } + if (tv) + { + /* SMP safe, again the code in arch/foo/time.c should + * globally block out interrupts when it runs. + */ + do_settimeofday(tv); + } + return 0; +} + +asmlinkage long sys_settimeofday(struct timeval *tv, struct timezone *tz) +{ + struct timeval new_tv; + struct timezone new_tz; + + if (tv) { + if (copy_from_user(&new_tv, tv, sizeof(*tv))) + return -EFAULT; + } + if (tz) { + if (copy_from_user(&new_tz, tz, sizeof(*tz))) + return -EFAULT; + } + + return do_sys_settimeofday(tv ? &new_tv : NULL, tz ? &new_tz : NULL); +} + +long pps_offset; /* pps time offset (us) */ +long pps_jitter = MAXTIME; /* time dispersion (jitter) (us) */ + +long pps_freq; /* frequency offset (scaled ppm) */ +long pps_stabil = MAXFREQ; /* frequency dispersion (scaled ppm) */ + +long pps_valid = PPS_VALID; /* pps signal watchdog counter */ + +int pps_shift = PPS_SHIFT; /* interval duration (s) (shift) */ + +long pps_jitcnt; /* jitter limit exceeded */ +long pps_calcnt; /* calibration intervals */ +long pps_errcnt; /* calibration errors */ +long pps_stbcnt; /* stability limit exceeded */ + +/* hook for a loadable hardpps kernel module */ +void (*hardpps_ptr)(struct timeval *); + +/* adjtimex mainly allows reading (and writing, if superuser) of + * kernel time-keeping variables. used by xntpd. + */ +int do_adjtimex(struct timex *txc) +{ + long ltemp, mtemp, save_adjust; + int result; + + /* In order to modify anything, you gotta be super-user! */ + if (txc->modes && !capable(CAP_SYS_TIME)) + return -EPERM; + + /* Now we validate the data before disabling interrupts */ + + if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) + /* singleshot must not be used with any other mode bits */ + if (txc->modes != ADJ_OFFSET_SINGLESHOT) + return -EINVAL; + + if (txc->modes != ADJ_OFFSET_SINGLESHOT && (txc->modes & ADJ_OFFSET)) + /* adjustment Offset limited to +- .512 seconds */ + if (txc->offset <= - MAXPHASE || txc->offset >= MAXPHASE ) + return -EINVAL; + + /* if the quartz is off by more than 10% something is VERY wrong ! */ + if (txc->modes & ADJ_TICK) + if (txc->tick < 900000/HZ || txc->tick > 1100000/HZ) + return -EINVAL; + + write_lock_irq(&xtime_lock); + result = time_state; /* mostly `TIME_OK' */ + + /* Save for later - semantics of adjtime is to return old value */ + save_adjust = time_adjust; + +#if 0 /* STA_CLOCKERR is never set yet */ + time_status &= ~STA_CLOCKERR; /* reset STA_CLOCKERR */ +#endif + /* If there are input parameters, then process them */ + if (txc->modes) + { + if (txc->modes & ADJ_STATUS) /* only set allowed bits */ + time_status = (txc->status & ~STA_RONLY) | + (time_status & STA_RONLY); + + if (txc->modes & ADJ_FREQUENCY) { /* p. 22 */ + if (txc->freq > MAXFREQ || txc->freq < -MAXFREQ) { + result = -EINVAL; + goto leave; + } + time_freq = txc->freq - pps_freq; + } + + if (txc->modes & ADJ_MAXERROR) { + if (txc->maxerror < 0 || txc->maxerror >= NTP_PHASE_LIMIT) { + result = -EINVAL; + goto leave; + } + time_maxerror = txc->maxerror; + } + + if (txc->modes & ADJ_ESTERROR) { + if (txc->esterror < 0 || txc->esterror >= NTP_PHASE_LIMIT) { + result = -EINVAL; + goto leave; + } + time_esterror = txc->esterror; + } + + if (txc->modes & ADJ_TIMECONST) { /* p. 24 */ + if (txc->constant < 0) { /* NTP v4 uses values > 6 */ + result = -EINVAL; + goto leave; + } + time_constant = txc->constant; + } + + if (txc->modes & ADJ_OFFSET) { /* values checked earlier */ + if (txc->modes == ADJ_OFFSET_SINGLESHOT) { + /* adjtime() is independent from ntp_adjtime() */ + time_adjust = txc->offset; + } + else if ( time_status & (STA_PLL | STA_PPSTIME) ) { + ltemp = (time_status & (STA_PPSTIME | STA_PPSSIGNAL)) == + (STA_PPSTIME | STA_PPSSIGNAL) ? + pps_offset : txc->offset; + + /* + * Scale the phase adjustment and + * clamp to the operating range. + */ + if (ltemp > MAXPHASE) + time_offset = MAXPHASE << SHIFT_UPDATE; + else if (ltemp < -MAXPHASE) + time_offset = -(MAXPHASE << SHIFT_UPDATE); + else + time_offset = ltemp << SHIFT_UPDATE; + + /* + * Select whether the frequency is to be controlled + * and in which mode (PLL or FLL). Clamp to the operating + * range. Ugly multiply/divide should be replaced someday. + */ + + if (time_status & STA_FREQHOLD || time_reftime == 0) + time_reftime = xtime.tv_sec; + mtemp = xtime.tv_sec - time_reftime; + time_reftime = xtime.tv_sec; + if (time_status & STA_FLL) { + if (mtemp >= MINSEC) { + ltemp = (time_offset / mtemp) << (SHIFT_USEC - + SHIFT_UPDATE); + if (ltemp < 0) + time_freq -= -ltemp >> SHIFT_KH; + else + time_freq += ltemp >> SHIFT_KH; + } else /* calibration interval too short (p. 12) */ + result = TIME_ERROR; + } else { /* PLL mode */ + if (mtemp < MAXSEC) { + ltemp *= mtemp; + if (ltemp < 0) + time_freq -= -ltemp >> (time_constant + + time_constant + + SHIFT_KF - SHIFT_USEC); + else + time_freq += ltemp >> (time_constant + + time_constant + + SHIFT_KF - SHIFT_USEC); + } else /* calibration interval too long (p. 12) */ + result = TIME_ERROR; + } + if (time_freq > time_tolerance) + time_freq = time_tolerance; + else if (time_freq < -time_tolerance) + time_freq = -time_tolerance; + } /* STA_PLL || STA_PPSTIME */ + } /* txc->modes & ADJ_OFFSET */ + if (txc->modes & ADJ_TICK) { + /* if the quartz is off by more than 10% something is + VERY wrong ! */ + if (txc->tick < 900000/HZ || txc->tick > 1100000/HZ) { + result = -EINVAL; + goto leave; + } + tick = txc->tick; + } + } /* txc->modes */ +leave: if ((time_status & (STA_UNSYNC|STA_CLOCKERR)) != 0 + || ((time_status & (STA_PPSFREQ|STA_PPSTIME)) != 0 + && (time_status & STA_PPSSIGNAL) == 0) + /* p. 24, (b) */ + || ((time_status & (STA_PPSTIME|STA_PPSJITTER)) + == (STA_PPSTIME|STA_PPSJITTER)) + /* p. 24, (c) */ + || ((time_status & STA_PPSFREQ) != 0 + && (time_status & (STA_PPSWANDER|STA_PPSERROR)) != 0)) + /* p. 24, (d) */ + result = TIME_ERROR; + + if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) + txc->offset = save_adjust; + else { + if (time_offset < 0) + txc->offset = -(-time_offset >> SHIFT_UPDATE); + else + txc->offset = time_offset >> SHIFT_UPDATE; + } + txc->freq = time_freq + pps_freq; + txc->maxerror = time_maxerror; + txc->esterror = time_esterror; + txc->status = time_status; + txc->constant = time_constant; + txc->precision = time_precision; + txc->tolerance = time_tolerance; + txc->tick = tick; + txc->ppsfreq = pps_freq; + txc->jitter = pps_jitter >> PPS_AVG; + txc->shift = pps_shift; + txc->stabil = pps_stabil; + txc->jitcnt = pps_jitcnt; + txc->calcnt = pps_calcnt; + txc->errcnt = pps_errcnt; + txc->stbcnt = pps_stbcnt; + write_unlock_irq(&xtime_lock); + do_gettimeofday(&txc->time); + return(result); +} + +asmlinkage long sys_adjtimex(struct timex *txc_p) +{ + struct timex txc; /* Local copy of parameter */ + int ret; + + /* Copy the user data space into the kernel copy + * structure. But bear in mind that the structures + * may change + */ + if(copy_from_user(&txc, txc_p, sizeof(struct timex))) + return -EFAULT; + ret = do_adjtimex(&txc); + return copy_to_user(txc_p, &txc, sizeof(struct timex)) ? -EFAULT : ret; +} |