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https://github.com/CTCaer/switch-l4t-atf.git
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7f56e9a31c
This patch gives users control over logging messages printed from the C code using the LOG macros defined in debug.h Users now have the ability to reduce the log_level at run time using the tf_log_set_max_level() function. The default prefix string can be defined by platform by overriding the `plat_log_get_prefix()` platform API which is also introduced in this patch. The new log framework results in saving of some RO data. For example, when BL1 is built for FVP with LOG_LEVEL=LOG_LEVEL_VERBOSE, resulted in saving 384 bytes of RO data and increase of 8 bytes of RW data. The framework also adds about 108 bytes of code to the release build of FVP. Fixes ARM-software/tf-issues#462 Change-Id: I476013d9c3deedfdd4c8b0b0f125665ba6250554 Co-authored-by: Eleanor Bonnici <Eleanor.bonnici@arm.com> Signed-off-by: Soby Mathew <soby.mathew@arm.com>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <debug.h>
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#include <platform.h>
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/* Set the default maximum log level to the `LOG_LEVEL` build flag */
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static unsigned int max_log_level = LOG_LEVEL;
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/*
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* The common log function which is invoked by ARM Trusted Firmware code.
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* This function should not be directly invoked and is meant to be
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* only used by the log macros defined in debug.h. The function
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* expects the first character in the format string to be one of the
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* LOG_MARKER_* macros defined in debug.h.
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*/
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void tf_log(const char *fmt, ...)
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{
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unsigned int log_level;
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va_list args;
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const char *prefix_str;
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/* We expect the LOG_MARKER_* macro as the first character */
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log_level = fmt[0];
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/* Verify that log_level is one of LOG_MARKER_* macro defined in debug.h */
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assert(log_level && log_level <= LOG_LEVEL_VERBOSE);
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assert(log_level % 10 == 0);
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if (log_level > max_log_level)
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return;
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prefix_str = plat_log_get_prefix(log_level);
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if (prefix_str != NULL)
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tf_string_print(prefix_str);
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va_start(args, fmt);
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tf_vprintf(fmt+1, args);
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va_end(args);
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}
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/*
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* The helper function to set the log level dynamically by platform. The
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* maximum log level is determined by `LOG_LEVEL` build flag at compile time
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* and this helper can set a lower log level than the one at compile.
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*/
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void tf_log_set_max_level(unsigned int log_level)
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{
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assert(log_level <= LOG_LEVEL_VERBOSE);
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assert((log_level % 10) == 0);
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/* Cap log_level to the compile time maximum. */
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if (log_level < LOG_LEVEL)
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max_log_level = log_level;
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}
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