| Antonio Nino Diaz | 4bac045 | 2018-10-16 14:32:34 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * If a platform wishes to use the functions in this file it has to be added to |
| 9 | * the Makefile of the platform. It is not included in the common Makefile. |
| 10 | */ |
| 11 | |
| 12 | #include <asm_macros.S> |
| 13 | #include <console.h> |
| 14 | |
| 15 | .globl plat_crash_console_init |
| 16 | .globl plat_crash_console_putc |
| 17 | .globl plat_crash_console_flush |
| 18 | |
| Julius Werner | 351ba73 | 2018-11-20 13:02:27 -0800 | [diff] [blame^] | 19 | #if !MULTI_CONSOLE_API |
| 20 | #error "This crash console implementation only works with the MULTI_CONSOLE_API!" |
| 21 | #endif |
| Antonio Nino Diaz | 4bac045 | 2018-10-16 14:32:34 +0100 | [diff] [blame] | 22 | |
| 23 | /* ----------------------------------------------------- |
| 24 | * int plat_crash_console_init(void) |
| 25 | * Use normal console by default. Switch it to crash |
| 26 | * mode so serial consoles become active again. |
| 27 | * NOTE: This default implementation will only work for |
| 28 | * crashes that occur after a normal console (marked |
| 29 | * valid for the crash state) has been registered with |
| 30 | * the console framework. To debug crashes that occur |
| 31 | * earlier, the platform has to override these functions |
| 32 | * with an implementation that initializes a console |
| 33 | * driver with hardcoded parameters. See |
| 34 | * docs/porting-guide.rst for more information. |
| 35 | * ----------------------------------------------------- |
| 36 | */ |
| 37 | func plat_crash_console_init |
| 38 | #if defined(IMAGE_BL1) |
| 39 | /* |
| 40 | * BL1 code can possibly crash so early that the data segment is not yet |
| 41 | * accessible. Don't risk undefined behavior by trying to run the normal |
| 42 | * console framework. Platforms that want to debug BL1 will need to |
| 43 | * override this with custom functions that can run from registers only. |
| 44 | */ |
| 45 | mov x0, #0 |
| 46 | ret |
| 47 | #else /* IMAGE_BL1 */ |
| 48 | mov x3, x30 |
| 49 | mov x0, #CONSOLE_FLAG_CRASH |
| 50 | bl console_switch_state |
| 51 | mov x0, #1 |
| 52 | ret x3 |
| 53 | #endif |
| 54 | endfunc plat_crash_console_init |
| 55 | |
| 56 | /* ----------------------------------------------------- |
| 57 | * void plat_crash_console_putc(int character) |
| 58 | * Output through the normal console by default. |
| 59 | * ----------------------------------------------------- |
| 60 | */ |
| 61 | func plat_crash_console_putc |
| 62 | b console_putc |
| 63 | endfunc plat_crash_console_putc |
| 64 | |
| 65 | /* ----------------------------------------------------- |
| 66 | * void plat_crash_console_flush(void) |
| 67 | * Flush normal console by default. |
| 68 | * ----------------------------------------------------- |
| 69 | */ |
| 70 | func plat_crash_console_flush |
| 71 | b console_flush |
| 72 | endfunc plat_crash_console_flush |