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/*
* Copyright (c) 2003 Josef Cejka
* Copyright (c) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup genericconsole
* @{
*/
/** @file
*/
#include <console/console.h>
#include <console/chardev.h>
#include <sysinfo/sysinfo.h>
#include <synch/waitq.h>
#include <synch/spinlock.h>
#include <arch/types.h>
#include <ddi/irq.h>
#include <ddi/ddi.h>
#include <event/event.h>
#include <ipc/irq.h>
#include <arch.h>
#include <func.h>
#include <print.h>
#include <putchar.h>
#include <atomic.h>
#include <syscall/copy.h>
#include <errno.h>
#define KLOG_SIZE PAGE_SIZE
#define KLOG_LATENCY 8
/** Kernel log cyclic buffer */
static wchar_t klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
/** Kernel log initialized */
static bool klog_inited = false;
/** First kernel log characters */
static index_t klog_start = 0;
/** Number of valid kernel log characters */
static size_t klog_len = 0;
/** Number of stored (not printed) kernel log characters */
static size_t klog_stored = 0;
/** Number of stored kernel log characters for uspace */
static size_t klog_uspace = 0;
/** Silence output */
bool silent = false;
/** Kernel log spinlock */
SPINLOCK_INITIALIZE(klog_lock);
/** Physical memory area used for klog buffer */
static parea_t klog_parea;
/** Standard input and output character devices */
indev_t *stdin = NULL;
outdev_t *stdout = NULL;
/** Initialize kernel logging facility
*
* The shared area contains kernel cyclic buffer. Userspace application may
* be notified on new data with indication of position and size
* of the data within the circular buffer.
*
*/
void klog_init(void)
{
void *faddr = (void *) KA2PA(klog);
ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
ASSERT(KLOG_SIZE % FRAME_SIZE == 0);
klog_parea.pbase = (uintptr_t) faddr;
klog_parea.frames = SIZE2FRAMES(sizeof(klog));
ddi_parea_register(&klog_parea);
sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(sizeof(klog)));
spinlock_lock(&klog_lock);
klog_inited = true;
spinlock_unlock(&klog_lock);
}
void grab_console(void)
{
silent = false;
arch_grab_console();
}
void release_console(void)
{
silent = true;
arch_release_console();
}
/** Tell kernel to get keyboard/console access again */
unative_t sys_debug_enable_console(void)
{
#ifdef CONFIG_KCONSOLE
grab_console();
return true;
#else
return false;
#endif
}
/** Tell kernel to relinquish keyboard/console access */
unative_t sys_debug_disable_console(void)
{
release_console();
return true;
}
bool check_poll(indev_t *indev)
{
if (indev == NULL)
return false;
if (indev->op == NULL)
return false;
return (indev->op->poll != NULL);
}
/** Get character from input character device. Do not echo character.
*
* @param indev Input character device.
* @return Character read.
*
*/
uint8_t _getc(indev_t *indev)
{
if (atomic_get(&haltstate)) {
/* If we are here, we are hopefully on the processor that
* issued the 'halt' command, so proceed to read the character
* directly from input
*/
if (check_poll(indev))
return indev->op->poll(indev);
/* No other way of interacting with user */
interrupts_disable();
if (CPU)
printf("cpu%u: ", CPU->id);
else
printf("cpu: ");
printf("halted (no polling input)\n");
cpu_halt();
}
waitq_sleep(&indev->wq);
ipl_t ipl = interrupts_disable();
spinlock_lock(&indev->lock);
uint8_t ch = indev->buffer[(indev->index - indev->counter) % INDEV_BUFLEN];
indev->counter--;
spinlock_unlock(&indev->lock);
interrupts_restore(ipl);
return ch;
}
/** Get string from input character device.
*
* Read characters from input character device until first occurrence
* of newline character.
*
* @param indev Input character device.
* @param buf Buffer where to store string terminated by '\0'.
* @param buflen Size of the buffer.
*
* @return Number of characters read.
*
*/
count_t gets(indev_t *indev, char *buf, size_t buflen)
{
index_t index = 0;
while (index < buflen) {
char ch = _getc(indev);
if (ch == '\b') {
if (index > 0) {
index--;
/* Space backspace, space */
putchar('\b');
putchar(' ');
putchar('\b');
}
continue;
}
putchar(ch);
if (ch == '\n') { /* end of string => write 0, return */
buf[index] = '\0';
return (count_t) index;
}
buf[index++] = ch;
}
return (count_t) index;
}
/** Get character from input device & echo it to screen */
uint8_t getc(indev_t *indev)
{
uint8_t ch = _getc(indev);
putchar(ch);
return ch;
}
void klog_update(void)
{
spinlock_lock(&klog_lock);
if ((klog_inited) && (event_is_subscribed(EVENT_KLOG)) && (klog_uspace > 0)) {
event_notify_3(EVENT_KLOG, klog_start, klog_len, klog_uspace);
klog_uspace = 0;
}
spinlock_unlock(&klog_lock);
}
void putchar(const wchar_t ch)
{
spinlock_lock(&klog_lock);
if ((klog_stored > 0) && (stdout) && (stdout->op->write)) {
/* Print charaters stored in kernel log */
index_t i;
for (i = klog_len - klog_stored; i < klog_len; i++)
stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE], silent);
klog_stored = 0;
}
/* Store character in the cyclic kernel log */
klog[(klog_start + klog_len) % KLOG_SIZE] = ch;
if (klog_len < KLOG_SIZE)
klog_len++;
else
klog_start = (klog_start + 1) % KLOG_SIZE;
if ((stdout) && (stdout->op->write))
stdout->op->write(stdout, ch, silent);
else {
/* The character is just in the kernel log */
if (klog_stored < klog_len)
klog_stored++;
}
/* The character is stored for uspace */
if (klog_uspace < klog_len)
klog_uspace++;
/* Check notify uspace to update */
bool update;
if ((klog_uspace > KLOG_LATENCY) || (ch == '\n'))
update = true;
else
update = false;
spinlock_unlock(&klog_lock);
if (update)
klog_update();
}
/** Print using kernel facility
*
* Print to kernel log.
*
*/
unative_t sys_klog(int fd, const void * buf, size_t count)
{
char *data;
int rc;
if (count > PAGE_SIZE)
return ELIMIT;
if (count > 0) {
data = (char *) malloc(count + 1, 0);
if (!data)
return ENOMEM;
rc = copy_from_uspace(data, buf, count);
if (rc) {
free(data);
return rc;
}
data[count] = 0;
printf("%s", data);
free(data);
} else
klog_update();
return count;
}
/** @}
*/