diff options
Diffstat (limited to 'drivers/console/aarch32/skeleton_console.S')
| -rw-r--r-- | drivers/console/aarch32/skeleton_console.S | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/console/aarch32/skeleton_console.S b/drivers/console/aarch32/skeleton_console.S new file mode 100644 index 00000000..383874e6 --- /dev/null +++ b/drivers/console/aarch32/skeleton_console.S @@ -0,0 +1,111 @@ +/* + * 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> + + /* + * 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 + + /* ----------------------------------------------- + * 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 |