/*
* 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/device.h>
#include <ddi/irq.h>
#include <ddi/ddi.h>
#include <ipc/irq.h>
#include <arch.h>
#include <func.h>
#include <print.h>
#include <atomic.h>
#define KLOG_SIZE PAGE_SIZE
#define KLOG_LATENCY 8
/**< Kernel log cyclic buffer */
static char 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;
/**< Kernel log spinlock */
SPINLOCK_INITIALIZE(klog_lock);
/** Physical memory area used for klog buffer */
static parea_t klog_parea;
/*
* For now, we use 0 as INR.
* However, it is therefore desirable to have architecture specific
* definition of KLOG_VIRT_INR in the future.
*/
#define KLOG_VIRT_INR 0
static irq_t klog_irq;
static chardev_operations_t null_stdout_ops = {
.suspend = NULL,
.resume = NULL,
.write = NULL,
.read = NULL
};
chardev_t null_stdout = {
.name = "null",
.op = &null_stdout_ops
};
/** Allways refuse IRQ ownership.
*
* This is not a real IRQ, so we always decline.
*
* @return Always returns IRQ_DECLINE.
*/
static irq_ownership_t klog_claim(void)
{
return IRQ_DECLINE;
}
/** Standard input character device */
chardev_t *stdin = NULL;
chardev_t *stdout = &null_stdout;
/** 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);
devno_t devno = device_assign_devno();
klog_parea.pbase = (uintptr_t) faddr;
klog_parea.vbase = (uintptr_t) klog;
klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
klog_parea.cacheable = true;
ddi_parea_register(&klog_parea);
sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
sysinfo_set_item_val("klog.devno", NULL, devno);
sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
irq_initialize(&klog_irq);
klog_irq.devno = devno;
klog_irq.inr = KLOG_VIRT_INR;
klog_irq.claim = klog_claim;
irq_register(&klog_irq);
spinlock_lock(&klog_lock);
klog_inited = true;
spinlock_unlock(&klog_lock);
}
/** Get character from character device. Do not echo character.
*
* @param chardev Character device.
*
* @return Character read.
*/
uint8_t _getc(chardev_t *chardev)
{
uint8_t ch;
ipl_t ipl;
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 (chardev->op->read)
return chardev->op->read(chardev);
/* no other way of interacting with user, halt */
if (CPU)
else
printf("halted (no kconsole)\n"); cpu_halt();
}
waitq_sleep(&chardev->wq);
ipl = interrupts_disable();
spinlock_lock(&chardev->lock);
ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
chardev->counter--;
spinlock_unlock(&chardev->lock);
interrupts_restore(ipl);
chardev->op->resume(chardev);
return ch;
}
/** Get string from character device.
*
* Read characters from character device until first occurrence
* of newline character.
*
* @param chardev 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(chardev_t
*chardev
, char *buf
, size_t buflen
){
index_t index = 0;
char ch;
while (index < buflen) {
ch = _getc(chardev);
if (ch == '\b') {
if (index > 0) {
index--;
/* Space backspace, space */
}
continue;
}
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 device & echo it to screen */
uint8_t getc(chardev_t
*chardev
) {
uint8_t ch;
ch = _getc(chardev);
return ch;
}
void klog_update(void)
{
spinlock_lock(&klog_lock);
if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
klog_uspace = 0;
}
spinlock_unlock(&klog_lock);
}
{
spinlock_lock(&klog_lock);
if ((klog_stored > 0) && (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]);
klog_stored = 0;
}
/* Store character in the cyclic kernel log */
klog[(klog_start + klog_len) % KLOG_SIZE] = c;
if (klog_len < KLOG_SIZE)
klog_len++;
else
klog_start = (klog_start + 1) % KLOG_SIZE;
if (stdout->op->write)
stdout->op->write(stdout, c);
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) || (c == '\n'))
update = true;
else
update = false;
spinlock_unlock(&klog_lock);
if (update)
klog_update();
}
/** @}
*/