| /* |
| * Copyright (c) 2016, 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> |
| |
| .globl console_init |
| .globl console_uninit |
| .globl console_putc |
| .globl console_getc |
| |
| /* |
| * The console base is in the data section and not in .bss |
| * even though it is zero-init. In particular, this allows |
| * the console functions to start using this variable before |
| * the runtime memory is initialized for images which do not |
| * need to copy the .data section from ROM to RAM. |
| */ |
| .section .data.console_base ; .align 2 |
| console_base: .word 0x0 |
| |
| /* ----------------------------------------------- |
| * int console_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. It saves |
| * the console base to the data section. |
| * 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 - r3 |
| * ----------------------------------------------- |
| */ |
| func console_init |
| /* Check the input base address */ |
| cmp r0, #0 |
| beq init_fail |
| ldr r3, =console_base |
| str r0, [r3] |
| b console_core_init |
| init_fail: |
| bx lr |
| endfunc console_init |
| |
| /* ----------------------------------------------- |
| * void console_uninit(void) |
| * Function to finish the use of console driver. |
| * It sets the console_base as NULL so that any |
| * further invocation of `console_putc` or |
| * `console_getc` APIs would return error. |
| * ----------------------------------------------- |
| */ |
| func console_uninit |
| mov r0, #0 |
| ldr r3, =console_base |
| str r0, [r3] |
| bx lr |
| endfunc console_uninit |
| |
| /* --------------------------------------------- |
| * int console_putc(int c) |
| * 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 |
| * Out : return -1 on error else return character. |
| * Clobber list : r1, r2 |
| * --------------------------------------------- |
| */ |
| func console_putc |
| ldr r2, =console_base |
| ldr r1, [r2] |
| b console_core_putc |
| endfunc console_putc |
| |
| /* --------------------------------------------- |
| * int console_getc(void) |
| * Function to get a character from the console. |
| * It returns the character grabbed on success |
| * or -1 on error. |
| * Clobber list : r0, r1 |
| * --------------------------------------------- |
| */ |
| func console_getc |
| ldr r1, =console_base |
| ldr r0, [r1] |
| b console_core_getc |
| endfunc console_getc |