1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #include <asm_macros.S> 7 8 /* 9 * This file contains a skeleton console implementation that can 10 * be used as basis for a real console implementation by platforms 11 * that do not contain PL011 hardware. 12 */ 13 14 .globl console_core_init 15 .globl console_core_putc 16 .globl console_core_getc 17 .globl console_core_flush 18 19 /* ----------------------------------------------- 20 * int console_core_init(uintptr_t base_addr, 21 * unsigned int uart_clk, unsigned int baud_rate) 22 * Function to initialize the console without a 23 * C Runtime to print debug information. This 24 * function will be accessed by console_init and 25 * crash reporting. 26 * In: x0 - console base address 27 * w1 - Uart clock in Hz 28 * w2 - Baud rate 29 * Out: return 1 on success else 0 on error 30 * Clobber list : x1, x2 31 * ----------------------------------------------- 32 */ 33 func console_core_init 34 /* Check the input base address */ 35 cbz x0, core_init_fail 36 /* Check baud rate and uart clock for sanity */ 37 cbz w1, core_init_fail 38 cbz w2, core_init_fail 39 /* Insert implementation here */ 40 mov w0, #1 41 ret 42 core_init_fail: 43 mov w0, wzr 44 ret 45 endfunc console_core_init 46 47 /* -------------------------------------------------------- 48 * int console_core_putc(int c, uintptr_t base_addr) 49 * Function to output a character over the console. It 50 * returns the character printed on success or -1 on error. 51 * In : w0 - character to be printed 52 * x1 - console base address 53 * Out : return -1 on error else return character. 54 * Clobber list : x2 55 * -------------------------------------------------------- 56 */ 57 func console_core_putc 58 /* Check the input parameter */ 59 cbz x1, putc_error 60 /* Insert implementation here */ 61 ret 62 putc_error: 63 mov w0, #-1 64 ret 65 endfunc console_core_putc 66 67 /* --------------------------------------------- 68 * int console_core_getc(uintptr_t base_addr) 69 * Function to get a character from the console. 70 * It returns the character grabbed on success 71 * or -1 on error. 72 * In : x0 - console base address 73 * Clobber list : x0, x1 74 * --------------------------------------------- 75 */ 76 func console_core_getc 77 cbz x0, getc_error 78 /* Insert implementation here */ 79 ret 80 getc_error: 81 mov w0, #-1 82 ret 83 endfunc console_core_getc 84 85 /* --------------------------------------------- 86 * int console_core_flush(uintptr_t base_addr) 87 * Function to force a write of all buffered 88 * data that hasn't been output. 89 * In : x0 - console base address 90 * Out : return -1 on error else return 0. 91 * Clobber list : x0, x1 92 * --------------------------------------------- 93 */ 94 func console_core_flush 95 cbz x0, flush_error 96 /* Insert implementation here */ 97 mov w0, #0 98 ret 99 flush_error: 100 mov w0, #-1 101 ret 102 endfunc console_core_flush 103
