| /* |
| * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| #include <asm_macros.S> |
| |
| .globl console_init |
| .globl console_uninit |
| .globl console_putc |
| .globl console_getc |
| .globl console_flush |
| |
| /* |
| * 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 3 |
| console_base: .quad 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: x0 - console base address |
| * w1 - Uart clock in Hz |
| * w2 - Baud rate |
| * out: return 1 on success else 0 on error |
| * Clobber list : x1 - x4 |
| * ----------------------------------------------- |
| */ |
| func console_init |
| /* Check the input base address */ |
| cbz x0, init_fail |
| adrp x3, console_base |
| str x0, [x3, :lo12:console_base] |
| b console_core_init |
| init_fail: |
| ret |
| 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 x0, #0 |
| adrp x3, console_base |
| str x0, [x3, :lo12:console_base] |
| ret |
| 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 : x0 - character to be printed |
| * Out : return -1 on error else return character. |
| * Clobber list : x1, x2 |
| * --------------------------------------------- |
| */ |
| func console_putc |
| adrp x2, console_base |
| ldr x1, [x2, :lo12:console_base] |
| 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 : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_getc |
| adrp x1, console_base |
| ldr x0, [x1, :lo12:console_base] |
| b console_core_getc |
| endfunc console_getc |
| |
| /* --------------------------------------------- |
| * int console_flush(void) |
| * Function to force a write of all buffered |
| * data that hasn't been output. It returns 0 |
| * upon successful completion, otherwise it |
| * returns -1. |
| * Clobber list : x0, x1 |
| * --------------------------------------------- |
| */ |
| func console_flush |
| adrp x1, console_base |
| ldr x0, [x1, :lo12:console_base] |
| b console_core_flush |
| endfunc console_flush |