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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/
#include <sys/syslog.h>
#include <sys/machdep.h>
#include <sys/tty.h>
#include <sys/cdefs.h>
#include <sys/timer.h>
#include <sys/spinlock.h>
#include <dev/vcons/vcons.h>
#include <fs/procfs.h>
#include <string.h>
#if defined(__KMSG_BUF_SHIFT)
#define KMSG_BUF_SHIFT __KMSG_BUF_SHIFT
#else
#define KMSG_BUF_SHIFT 12
#endif
#define KMSG_BUF_SIZE (1 << KMSG_BUF_SHIFT)
__STATIC_ASSERT(KMSG_BUF_SHIFT <= 16, "Log buffer shift too large!\n");
static char kmsg_buf[KMSG_BUF_SIZE];
static size_t kmsg_buf_idx = 0;
static struct proc_entry *kmsg_proc;
static struct spinlock lock = {0};
struct vcons_screen g_syslog_screen = {0};
bool g_syslog_use_tty = true;
static inline void
kmsg_buf_putc(char c)
{
kmsg_buf[kmsg_buf_idx++] = c;
kmsg_buf[kmsg_buf_idx] = '\0';
if (kmsg_buf_idx >= (KMSG_BUF_SIZE - 1))
kmsg_buf_idx = 0;
}
static int
proc_kmsg_read(struct proc_entry *p, struct sio_txn *sio)
{
if (sio->len > KMSG_BUF_SIZE)
sio->len = KMSG_BUF_SIZE;
memcpy(sio->buf, kmsg_buf, sio->len);
return sio->len;
}
static void
syslog_write(const char *s, size_t len)
{
size_t tmp_len = len;
const char *tmp_s = s;
while (tmp_len--) {
#if defined(__SERIAL_DEBUG)
serial_dbgch(*tmp_s);
#endif /* defined(__SERIAL_DEBUG) */
kmsg_buf_putc(*tmp_s);
if (g_syslog_use_tty)
tty_putc(&g_root_tty, *tmp_s, TTY_SOURCE_RAW);
++tmp_s;
}
tty_flush(&g_root_tty);
}
/*
* XXX: Not serialized
*/
void
vkprintf(const char *fmt, va_list *ap)
{
char buffer[1024] = {0};
vsnprintf(buffer, sizeof(buffer), fmt, *ap);
syslog_write(buffer, strlen(buffer));
}
void
kprintf(const char *fmt, ...)
{
va_list ap;
char timestamp[64] = "[ 0.000000] ";
bool has_counter = true;
bool use_timestamp = true;
const char *fmt_p = fmt;
struct timer tmr = {0};
spinlock_acquire(&lock);
/*
* If the first char is OMIT_TIMESTAMP, then we won't
* print out the timestamp.
*/
if (*fmt_p == OMIT_TIMESTAMP[0]) {
++fmt_p;
use_timestamp = false;
}
/* See if we can use the counter */
if (req_timer(TIMER_GP, &tmr) != 0)
has_counter = false;
/* If we can use the counter, format the timestamp */
if (has_counter) {
if (tmr.get_time_sec != NULL && tmr.get_time_usec != NULL)
snprintf(timestamp, sizeof(timestamp), "[ %d.%06d] ",
tmr.get_time_sec(), tmr.get_time_usec());
}
if (use_timestamp) {
syslog_write(timestamp, strlen(timestamp));
}
va_start(ap, fmt);
vkprintf(fmt_p, &ap);
va_end(ap);
spinlock_release(&lock);
}
void
syslog_init_proc(void)
{
kmsg_proc = procfs_alloc_entry();
kmsg_proc->read = proc_kmsg_read;
procfs_add_entry("kmsg", kmsg_proc);
}
void
syslog_init(void)
{
g_syslog_screen.bg = 0x000000;
g_syslog_screen.fg = 0x808080;
vcons_attach(&g_syslog_screen);
}
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