1 /* 2 * Copyright (c) 2017-2019, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <stdarg.h> 8 #include <assert.h> 9 #include <stdio.h> 10 11 #include <common/debug.h> 12 #include <plat/common/platform.h> 13 14 /* Set the default maximum log level to the `LOG_LEVEL` build flag */ 15 static unsigned int max_log_level = LOG_LEVEL; 16 17 /* 18 * The common log function which is invoked by TF-A code. 19 * This function should not be directly invoked and is meant to be 20 * only used by the log macros defined in debug.h. The function 21 * expects the first character in the format string to be one of the 22 * LOG_MARKER_* macros defined in debug.h. 23 */ tf_log(const char * fmt,...)24void tf_log(const char *fmt, ...) 25 { 26 unsigned int log_level; 27 va_list args; 28 const char *prefix_str; 29 30 /* We expect the LOG_MARKER_* macro as the first character */ 31 log_level = fmt[0]; 32 33 /* Verify that log_level is one of LOG_MARKER_* macro defined in debug.h */ 34 assert((log_level > 0U) && (log_level <= LOG_LEVEL_VERBOSE)); 35 assert((log_level % 10U) == 0U); 36 37 if (log_level > max_log_level) 38 return; 39 40 prefix_str = plat_log_get_prefix(log_level); 41 42 while (*prefix_str != '\0') { 43 (void)putchar(*prefix_str); 44 prefix_str++; 45 } 46 47 va_start(args, fmt); 48 (void)vprintf(fmt + 1, args); 49 va_end(args); 50 } 51 52 /* 53 * The helper function to set the log level dynamically by platform. The 54 * maximum log level is determined by `LOG_LEVEL` build flag at compile time 55 * and this helper can set a lower (or equal) log level than the one at compile. 56 */ tf_log_set_max_level(unsigned int log_level)57void tf_log_set_max_level(unsigned int log_level) 58 { 59 assert(log_level <= LOG_LEVEL_VERBOSE); 60 assert((log_level % 10U) == 0U); 61 62 /* Cap log_level to the compile time maximum. */ 63 if (log_level <= (unsigned int)LOG_LEVEL) 64 max_log_level = log_level; 65 } 66