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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
/*-
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* Copyright (c) 2021 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <stand.h>
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#include "bootstrap.h"
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/* Buffer for holding tslog data in string format. */
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#ifndef LOADER_TSLOGSIZE
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#define LOADER_TSLOGSIZE (2 * 1024 * 1024)
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#endif
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int
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tslog_init(void)
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{
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void * tslog_buf;
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/* Allocate buffer and pass to libsa tslog code. */
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if ((tslog_buf = malloc(LOADER_TSLOGSIZE)) == NULL)
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return (-1);
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tslog_setbuf(tslog_buf, LOADER_TSLOGSIZE);
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/* Record this as when we entered the loader. */
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TSRAW("ENTER", "loader", NULL);
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return (0);
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}
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/*
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* Pass our tslog buffer as a preloaded "module" to the kernel. This should
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* be called as late as possible prior to the kernel being executed, since
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* any timestamps logged after this is called will not be visible to the
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* kernel.
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*/
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int
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tslog_publish(void)
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{
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void * tslog_buf;
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size_t tslog_bufpos;
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/* Record a log entry for ending logging. */
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TSRAW("EXIT", "loader", NULL);
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/* Get the buffer and its current length. */
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tslog_getbuf(&tslog_buf, &tslog_bufpos);
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/* If we never allocated a buffer, return an error. */
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if (tslog_buf == NULL)
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return (-1);
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/* Store the buffer where the kernel can read it. */
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return (file_addbuf("TSLOG", "TSLOG data", tslog_bufpos, tslog_buf));
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}
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