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/*
* printk.c: printk() output fn and helpers
*
* Copyright (c) 2006-2010, Intel Corporation
* 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.
* * Neither the name of the Intel Corporation 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 <config.h>
#include <efibase.h>
#include <types.h>
#include <stdbool.h>
#include <stdarg.h>
#include <compiler.h>
#include <string.h>
#include <mutex.h>
#include <misc.h>
#include <printk.h>
#include <eficore.h>
#include <cmdline.h>
#include <tb_error.h>
#include <tboot.h>
uint8_t g_log_level = TBOOT_LOG_LEVEL_NONE;
uint8_t g_log_targets = TBOOT_LOG_TARGET_NONE;
static struct mutex print_lock;
/*
* memory logging
*/
/* memory-based serial log (ensure in .data section so that not cleared) */
__data tboot_log_t g_log = {0};
static void memlog_init(void)
{
if ( !g_log.is_init ) {
g_log.uuid = (uuid_t)TBOOT_LOG_UUID;
g_log.curr_pos = 0;
g_log.max_size = TBOOT_MEM_LOG_SIZE;
g_log.is_init = true;
}
/* initialize these post-launch as well, since bad/malicious values */
/* could compromise environment */
g_log.uuid = (uuid_t)TBOOT_LOG_UUID;
g_log.max_size = TBOOT_MEM_LOG_SIZE;
/* if we're calling this post-launch, verify that curr_pos is valid */
if ( g_log.curr_pos > g_log.max_size )
g_log.curr_pos = 0;
}
static void memlog_write(const char *str, unsigned int count)
{
if ( count > g_log.max_size )
return;
/* wrap to beginning if too big to fit */
if ( g_log.curr_pos + count >= g_log.max_size )
g_log.curr_pos = 0;
memcpy(&g_log.buf[g_log.curr_pos], str, count);
g_log.curr_pos += count;
/* if the string wasn't NULL-terminated, then NULL-terminate the log */
if ( str[count-1] != '\0' )
g_log.buf[g_log.curr_pos] = '\0';
else {
/* so that curr_pos will point to the NULL and be overwritten */
/* on next copy */
g_log.curr_pos--;
}
}
void printk_init(printk_init_t init_type)
{
if (init_type == INIT_EARLY_EFI || init_type == INIT_POST_LAUNCH)
mtx_init(&print_lock);
if (init_type == INIT_EARLY_EFI) {
/* Default to EFI logging at early startup */
#ifdef EFI_EARLY_PRINTK
g_log_targets = TBOOT_LOG_TARGET_EFI;
g_log_level = TBOOT_LOG_LEVEL_ALL;
#endif
return;
}
/* parse loglvl from string to int */
get_tboot_loglvl();
/* parse logging targets */
get_tboot_log_targets();
if (init_type == INIT_POST_EBS || init_type == INIT_POST_LAUNCH) {
/* now we can use VGA logging, EFI console is gone */
if ( g_log_targets & TBOOT_LOG_TARGET_VGA ) {
vga_init();
get_tboot_vga_delay(); /* parse vga delay time */
}
/* cannot use EFI logging any longer also */
g_log_targets &= ~TBOOT_LOG_TARGET_EFI;
}
if (init_type == INIT_PRE_LAUNCH || init_type == INIT_POST_LAUNCH) {
/* parse serial settings */
if ( !get_tboot_serial() )
g_log_targets &= ~TBOOT_LOG_TARGET_SERIAL;
if ( g_log_targets & TBOOT_LOG_TARGET_SERIAL )
serial_init();
if ( g_log_targets & TBOOT_LOG_TARGET_MEMORY )
memlog_init();
}
}
#define WRITE_LOGS(s, n) \
do { \
if (g_log_targets & TBOOT_LOG_TARGET_EFI) efi_write(s, n); \
if (g_log_targets & TBOOT_LOG_TARGET_MEMORY) memlog_write(s, n); \
if (g_log_targets & TBOOT_LOG_TARGET_SERIAL) serial_write(s, n); \
if (g_log_targets & TBOOT_LOG_TARGET_VGA) vga_write(s, n); \
} while (0)
void printk(const char *fmt, ...)
{
char buf[TBOOT_LOGBUF_SIZE];
char *pbuf = buf;
int n;
va_list ap;
uint8_t log_level;
static bool last_line_cr = true;
memset(buf, '\0', sizeof(buf));
va_start(ap, fmt);
n = vscnprintf(buf, sizeof(buf), fmt, ap);
log_level = get_loglvl_prefix(&pbuf, &n);
if ( !(g_log_level & log_level) )
goto exit;
mtx_enter(&print_lock);
/* prepend "TBOOT: " if the last line that was printed ended with a '\n' */
if ( last_line_cr )
WRITE_LOGS("TBOOT: ", 8);
last_line_cr = (n > 0 && (*(pbuf+n-1) == '\n'));
WRITE_LOGS(pbuf, n);
mtx_leave(&print_lock);
exit:
va_end(ap);
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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