1/* 2 * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30#include <asm_macros.S> 31 32 /* 33 * This file contains a skeleton console implementation that can 34 * be used as basis for a real console implementation by platforms 35 * that do not contain PL011 hardware. 36 */ 37 38 .globl console_core_init 39 .globl console_core_putc 40 .globl console_core_getc 41 42 /* ----------------------------------------------- 43 * int console_core_init(uintptr_t base_addr, 44 * unsigned int uart_clk, unsigned int baud_rate) 45 * Function to initialize the console without a 46 * C Runtime to print debug information. This 47 * function will be accessed by console_init and 48 * crash reporting. 49 * In: x0 - console base address 50 * w1 - Uart clock in Hz 51 * w2 - Baud rate 52 * Out: return 1 on success else 0 on error 53 * Clobber list : x1, x2 54 * ----------------------------------------------- 55 */ 56func console_core_init 57 /* Check the input base address */ 58 cbz x0, core_init_fail 59 /* Check baud rate and uart clock for sanity */ 60 cbz w1, core_init_fail 61 cbz w2, core_init_fail 62 /* Insert implementation here */ 63 mov w0, #1 64 ret 65core_init_fail: 66 mov w0, wzr 67 ret 68endfunc console_core_init 69 70 /* -------------------------------------------------------- 71 * int console_core_putc(int c, uintptr_t base_addr) 72 * Function to output a character over the console. It 73 * returns the character printed on success or -1 on error. 74 * In : w0 - character to be printed 75 * x1 - console base address 76 * Out : return -1 on error else return character. 77 * Clobber list : x2 78 * -------------------------------------------------------- 79 */ 80func console_core_putc 81 /* Check the input parameter */ 82 cbz x1, putc_error 83 /* Insert implementation here */ 84 ret 85putc_error: 86 mov w0, #-1 87 ret 88endfunc console_core_putc 89 90 /* --------------------------------------------- 91 * int console_core_getc(uintptr_t base_addr) 92 * Function to get a character from the console. 93 * It returns the character grabbed on success 94 * or -1 on error. 95 * In : x0 - console base address 96 * Clobber list : x0, x1 97 * --------------------------------------------- 98 */ 99func console_core_getc 100 cbz x0, getc_error 101 /* Insert implementation here */ 102 ret 103getc_error: 104 mov w0, #-1 105 ret 106endfunc console_core_getc 107