112 lines
3.7 KiB
ArmAsm
112 lines
3.7 KiB
ArmAsm
/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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/* -----------------------------------------------
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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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