diff options
Diffstat (limited to 'drivers/console/aarch32/skeleton_console.S')
| -rw-r--r-- | drivers/console/aarch32/skeleton_console.S | 108 |
1 files changed, 108 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..da4cecd3 --- /dev/null +++ b/drivers/console/aarch32/skeleton_console.S @@ -0,0 +1,108 @@ +/* + * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ +#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 + .globl console_core_flush + + /* ----------------------------------------------- + * 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 + + /* --------------------------------------------- + * int console_core_flush(uintptr_t base_addr) + * Function to force a write of all buffered + * data that hasn't been output. + * In : r0 - console base address + * Out : return -1 on error else return 0. + * Clobber list : r0, r1 + * --------------------------------------------- + */ +func console_core_flush + cmp r0, #0 + beq flush_error + /* Insert implementation here */ + mov r0, #0 + bx lr +flush_error: + mov r0, #-1 + bx lr +endfunc console_core_flush |