| /* |
| * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| #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 |
| .globl console_core_flush |
| |
| /* ----------------------------------------------- |
| * 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: r0 - console base address |
| * r1 - Uart clock in Hz |
| * r2 - Baud rate |
| * Out: return 1 on success else 0 on error |
| * Clobber list : r1, r2 |
| * ----------------------------------------------- |
| */ |
| func console_core_init |
| /* Check the input base address */ |
| cmp r0, #0 |
| beq core_init_fail |
| /* Check baud rate and uart clock for sanity */ |
| cmp r1, #0 |
| beq core_init_fail |
| cmp r2, #0 |
| beq core_init_fail |
| /* Insert implementation here */ |
| mov r0, #1 |
| bx lr |
| core_init_fail: |
| mov r0, #0 |
| bx lr |
| 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 : r0 - character to be printed |
| * r1 - console base address |
| * Out : return -1 on error else return character. |
| * Clobber list : r2 |
| * -------------------------------------------------------- |
| */ |
| func console_core_putc |
| /* Check the input parameter */ |
| cmp r1, #0 |
| beq putc_error |
| /* Insert implementation here */ |
| bx lr |
| putc_error: |
| mov r0, #-1 |
| bx lr |
| 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 : r0 - console base address |
| * Clobber list : r0, r1 |
| * --------------------------------------------- |
| */ |
| func console_core_getc |
| cmp r0, #0 |
| beq getc_error |
| /* Insert implementation here */ |
| bx lr |
| getc_error: |
| mov r0, #-1 |
| bx lr |
| endfunc console_core_getc |
| |
| /* --------------------------------------------- |
| * int console_core_flush(uintptr_t base_addr) |
| * Function to force a write of all buffered |
| * data that hasn't been output. |
| * In : r0 - console base address |
| * Out : return -1 on error else return 0. |
| * Clobber list : r0, r1 |
| * --------------------------------------------- |
| */ |
| func console_core_flush |
| cmp r0, #0 |
| beq flush_error |
| /* Insert implementation here */ |
| mov r0, #0 |
| bx lr |
| flush_error: |
| mov r0, #-1 |
| bx lr |
| endfunc console_core_flush |