| /* |
| * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of ARM nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without specific |
| * prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #include <asm_macros.S> |
| |
| /* |
| * This file contains a skeleton console implementation that can |
| * be used as basis for a real console implementation by platforms |
| * that do not contain PL011 hardware. |
| */ |
| |
| .globl console_core_init |
| .globl console_core_putc |
| .globl console_core_getc |
| |
| /* ----------------------------------------------- |
| * int console_core_init(uintptr_t base_addr, |
| * unsigned int uart_clk, unsigned int baud_rate) |
| * Function to initialize the console without a |
| * C Runtime to print debug information. This |
| * function will be accessed by console_init and |
| * crash reporting. |
| * In: x0 - console base address |
| * w1 - Uart clock in Hz |
| * w2 - Baud rate |
| * Out: return 1 on success else 0 on error |
| * Clobber list : x1, x2 |
| * ----------------------------------------------- |
| */ |
| func console_core_init |
| /* Check the input base address */ |
| cbz x0, core_init_fail |
| /* Check baud rate and uart clock for sanity */ |
| cbz w1, core_init_fail |
| cbz w2, core_init_fail |
| /* Insert implementation here */ |
| mov w0, #1 |
| ret |
| core_init_fail: |
| mov w0, wzr |
| ret |
| endfunc console_core_init |
| |
| /* -------------------------------------------------------- |
| * int console_core_putc(int c, uintptr_t base_addr) |
| * Function to output a character over the console. It |
| * returns the character printed on success or -1 on error. |
| * In : w0 - character to be printed |
| * x1 - console base address |
| * Out : return -1 on error else return character. |
| * Clobber list : x2 |
| * -------------------------------------------------------- |
| */ |
| func console_core_putc |
| /* Check the input parameter */ |
| cbz x1, putc_error |
| /* Insert implementation here */ |
| ret |
| putc_error: |
| mov w0, #-1 |
| ret |
| endfunc console_core_putc |
| |
| /* --------------------------------------------- |
| * int console_core_getc(uintptr_t base_addr) |
| * Function to get a character from the console. |
| * It returns the character grabbed on success |
| * or -1 on error. |
| * In : x0 - console base address |
| * Clobber list : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_core_getc |
| cbz x0, getc_error |
| /* Insert implementation here */ |
| ret |
| getc_error: |
| mov w0, #-1 |
| ret |
| endfunc console_core_getc |