109 lines
2.8 KiB
ArmAsm
109 lines
2.8 KiB
ArmAsm
/*
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* Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm_macros.S>
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/*
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* This file contains a skeleton console implementation that can
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* be used as basis for a real console implementation by platforms
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* that do not contain PL011 hardware.
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*/
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.globl console_core_init
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.globl console_core_putc
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.globl console_core_getc
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.globl console_core_flush
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/* -----------------------------------------------
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* int console_core_init(uintptr_t base_addr,
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* unsigned int uart_clk, unsigned int baud_rate)
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* Function to initialize the console without a
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* C Runtime to print debug information. This
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* function will be accessed by console_init and
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* crash reporting.
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* In: r0 - console base address
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* r1 - Uart clock in Hz
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* r2 - Baud rate
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* Out: return 1 on success else 0 on error
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* Clobber list : r1, r2
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* -----------------------------------------------
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*/
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func console_core_init
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/* Check the input base address */
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cmp r0, #0
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beq core_init_fail
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/* Check baud rate and uart clock for sanity */
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cmp r1, #0
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beq core_init_fail
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cmp r2, #0
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beq core_init_fail
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/* Insert implementation here */
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mov r0, #1
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bx lr
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core_init_fail:
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mov r0, #0
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bx lr
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endfunc console_core_init
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/* --------------------------------------------------------
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* int console_core_putc(int c, uintptr_t base_addr)
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* Function to output a character over the console. It
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* returns the character printed on success or -1 on error.
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* In : r0 - character to be printed
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* r1 - console base address
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* Out : return -1 on error else return character.
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* Clobber list : r2
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* --------------------------------------------------------
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*/
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func console_core_putc
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/* Check the input parameter */
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cmp r1, #0
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beq putc_error
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/* Insert implementation here */
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bx lr
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putc_error:
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mov r0, #-1
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bx lr
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endfunc console_core_putc
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/* ---------------------------------------------
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* int console_core_getc(uintptr_t base_addr)
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* Function to get a character from the console.
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* It returns the character grabbed on success
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* or -1 on error.
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* In : r0 - console base address
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* Clobber list : r0, r1
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* ---------------------------------------------
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*/
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func console_core_getc
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cmp r0, #0
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beq getc_error
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/* Insert implementation here */
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bx lr
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getc_error:
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mov r0, #-1
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bx lr
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endfunc console_core_getc
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/* ---------------------------------------------
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* int console_core_flush(uintptr_t base_addr)
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* Function to force a write of all buffered
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* data that hasn't been output.
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* In : r0 - console base address
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* Out : return -1 on error else return 0.
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* Clobber list : r0, r1
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* ---------------------------------------------
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*/
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func console_core_flush
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cmp r0, #0
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beq flush_error
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/* Insert implementation here */
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mov r0, #0
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bx lr
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flush_error:
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mov r0, #-1
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bx lr
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endfunc console_core_flush
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