1 /* ram_console.c - Console messages to a RAM buffer */ 2 3 /* 4 * Copyright (c) 2015 Intel Corporation 5 * Copyright 2024 NXP 6 * 7 * SPDX-License-Identifier: Apache-2.0 8 */ 9 10 11 #include <zephyr/kernel.h> 12 #include <zephyr/sys/printk.h> 13 #include <zephyr/sys/printk-hooks.h> 14 #include <zephyr/sys/libc-hooks.h> 15 #include <zephyr/device.h> 16 #include <zephyr/init.h> 17 #include <zephyr/linker/devicetree_regions.h> 18 19 #ifdef CONFIG_RAM_CONSOLE_BUFFER_SECTION 20 #if !DT_HAS_CHOSEN(zephyr_ram_console) 21 #error "Lack of chosen property zephyr,ram_console!" 22 #elif (CONFIG_RAM_CONSOLE_BUFFER_SIZE > DT_REG_SIZE(DT_CHOSEN(zephyr_ram_console))) 23 #error "Custom RAM console buffer exceeds the section size!" 24 #endif 25 26 #define RAM_CONSOLE_BUF_ATTR \ 27 __attribute__((__section__(LINKER_DT_NODE_REGION_NAME(DT_CHOSEN(zephyr_ram_console))))) 28 #else 29 #define RAM_CONSOLE_BUF_ATTR 30 #endif 31 32 char ram_console_buf[CONFIG_RAM_CONSOLE_BUFFER_SIZE] RAM_CONSOLE_BUF_ATTR; 33 char *ram_console; 34 static int pos; 35 ram_console_out(int character)36static int ram_console_out(int character) 37 { 38 ram_console[pos] = (char)character; 39 /* Leave one byte to ensure we're always NULL-terminated */ 40 pos = (pos + 1) % (CONFIG_RAM_CONSOLE_BUFFER_SIZE - 1); 41 return character; 42 } 43 ram_console_init(void)44static int ram_console_init(void) 45 { 46 #ifdef CONFIG_RAM_CONSOLE_BUFFER_SECTION 47 mm_reg_t ram_console_va; 48 49 device_map((mm_reg_t *)&ram_console_va, DT_REG_ADDR(DT_CHOSEN(zephyr_ram_console)), 50 CONFIG_RAM_CONSOLE_BUFFER_SIZE, K_MEM_CACHE_NONE | K_MEM_DIRECT_MAP); 51 ram_console = (char *)ram_console_va, 52 #else 53 ram_console = ram_console_buf, 54 #endif 55 __printk_hook_install(ram_console_out); 56 __stdout_hook_install(ram_console_out); 57 58 return 0; 59 } 60 61 SYS_INIT(ram_console_init, PRE_KERNEL_1, CONFIG_CONSOLE_INIT_PRIORITY); 62
