c8dfc327db
This adds tslog_init, which allocates a 2MB buffer for recording timestamped events; and tslog_publish, which takes the buffer and passes it to the kernel as a "preloaded module". These functions will be used in a later commit. Reviewed by: kevans
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*-
|
|
* Copyright (c) 2021 Colin Percival
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <stand.h>
|
|
|
|
#include "bootstrap.h"
|
|
|
|
/* Buffer for holding tslog data in string format. */
|
|
#ifndef LOADER_TSLOGSIZE
|
|
#define LOADER_TSLOGSIZE (2 * 1024 * 1024)
|
|
#endif
|
|
|
|
int
|
|
tslog_init(void)
|
|
{
|
|
void * tslog_buf;
|
|
|
|
/* Allocate buffer and pass to libsa tslog code. */
|
|
if ((tslog_buf = malloc(LOADER_TSLOGSIZE)) == NULL)
|
|
return (-1);
|
|
tslog_setbuf(tslog_buf, LOADER_TSLOGSIZE);
|
|
|
|
/* Record this as when we entered the loader. */
|
|
TSRAW("ENTER", "loader", NULL);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Pass our tslog buffer as a preloaded "module" to the kernel. This should
|
|
* be called as late as possible prior to the kernel being executed, since
|
|
* any timestamps logged after this is called will not be visible to the
|
|
* kernel.
|
|
*/
|
|
int
|
|
tslog_publish(void)
|
|
{
|
|
void * tslog_buf;
|
|
size_t tslog_bufpos;
|
|
|
|
/* Record a log entry for ending logging. */
|
|
TSRAW("EXIT", "loader", NULL);
|
|
|
|
/* Get the buffer and its current length. */
|
|
tslog_getbuf(&tslog_buf, &tslog_bufpos);
|
|
|
|
/* If we never allocated a buffer, return an error. */
|
|
if (tslog_buf == NULL)
|
|
return (-1);
|
|
|
|
/* Store the buffer where the kernel can read it. */
|
|
return (file_addbuf("TSLOG", "TSLOG data", tslog_bufpos, tslog_buf));
|
|
}
|