| 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> |
| Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 13 | #include <drivers/console.h> |
| Antonio Nino Diaz | 4bac045 | 2018-10-16 14:32:34 +0100 | [diff] [blame] | 14 | |
| 15 | .globl plat_crash_console_init |
| 16 | .globl plat_crash_console_putc |
| 17 | .globl plat_crash_console_flush |
| 18 | |
| 19 | #if MULTI_CONSOLE_API |
| 20 | |
| 21 | /* ----------------------------------------------------- |
| 22 | * int plat_crash_console_init(void) |
| 23 | * Use normal console by default. Switch it to crash |
| 24 | * mode so serial consoles become active again. |
| 25 | * NOTE: This default implementation will only work for |
| 26 | * crashes that occur after a normal console (marked |
| 27 | * valid for the crash state) has been registered with |
| 28 | * the console framework. To debug crashes that occur |
| 29 | * earlier, the platform has to override these functions |
| 30 | * with an implementation that initializes a console |
| 31 | * driver with hardcoded parameters. See |
| 32 | * docs/porting-guide.rst for more information. |
| 33 | * ----------------------------------------------------- |
| 34 | */ |
| 35 | func plat_crash_console_init |
| 36 | #if defined(IMAGE_BL1) |
| 37 | /* |
| 38 | * BL1 code can possibly crash so early that the data segment is not yet |
| 39 | * accessible. Don't risk undefined behavior by trying to run the normal |
| 40 | * console framework. Platforms that want to debug BL1 will need to |
| 41 | * override this with custom functions that can run from registers only. |
| 42 | */ |
| 43 | mov r0, #0 |
| 44 | bx lr |
| 45 | #else /* IMAGE_BL1 */ |
| 46 | mov r3, lr |
| 47 | mov r0, #CONSOLE_FLAG_CRASH |
| 48 | bl console_switch_state |
| 49 | mov r0, #1 |
| 50 | bx r3 |
| 51 | #endif |
| 52 | endfunc plat_crash_console_init |
| 53 | |
| 54 | /* ----------------------------------------------------- |
| 55 | * void plat_crash_console_putc(int character) |
| 56 | * Output through the normal console by default. |
| 57 | * ----------------------------------------------------- |
| 58 | */ |
| 59 | func plat_crash_console_putc |
| 60 | b console_putc |
| 61 | endfunc plat_crash_console_putc |
| 62 | |
| 63 | /* ----------------------------------------------------- |
| 64 | * void plat_crash_console_flush(void) |
| 65 | * Flush normal console by default. |
| 66 | * ----------------------------------------------------- |
| 67 | */ |
| 68 | func plat_crash_console_flush |
| 69 | b console_flush |
| 70 | endfunc plat_crash_console_flush |
| 71 | |
| 72 | #else /* MULTI_CONSOLE_API */ |
| 73 | |
| 74 | /* ----------------------------------------------------- |
| 75 | * In the old API these are all no-op stubs that need to |
| 76 | * be overridden by the platform to be useful. |
| 77 | * ----------------------------------------------------- |
| 78 | */ |
| 79 | func plat_crash_console_init |
| 80 | mov r0, #0 |
| 81 | bx lr |
| 82 | endfunc plat_crash_console_init |
| 83 | |
| 84 | func plat_crash_console_putc |
| 85 | bx lr |
| 86 | endfunc plat_crash_console_putc |
| 87 | |
| 88 | func plat_crash_console_flush |
| 89 | bx lr |
| 90 | endfunc plat_crash_console_flush |
| 91 | |
| 92 | #endif |