| Julius Werner | 94f8907 | 2017-07-31 18:15:11 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | #ifndef __CONSOLE_MACROS_S__ |
| 7 | #define __CONSOLE_MACROS_S__ |
| 8 | |
| 9 | #include <console.h> |
| 10 | |
| 11 | /* |
| 12 | * This macro encapsulates the common setup that has to be done at the end of |
| 13 | * a console driver's register function. It will register all of the driver's |
| 14 | * callbacks in the console_t structure and initialize the flags field (by |
| 15 | * default consoles are enabled for the "boot" and "crash" states, this can be |
| 16 | * changed after registration with the console_set_scope() function). It ends |
| 17 | * with a tail call that will include return to the caller. |
| 18 | * REQUIRES console_t pointer in x0 and a valid return address in x30. |
| 19 | */ |
| 20 | .macro finish_console_register _driver |
| 21 | /* |
| 22 | * Add these weak definitions so we will automatically write a 0 if the |
| 23 | * function doesn't exist. I'd rather use .ifdef but that only works if |
| 24 | * the function was defined (not just declared .global) above this point |
| 25 | * in the file, which we can't guarantee. |
| 26 | */ |
| 27 | .weak console_\_driver\()_putc |
| 28 | .weak console_\_driver\()_getc |
| 29 | .weak console_\_driver\()_flush |
| 30 | |
| 31 | /* Don't use adrp on weak funcs! See GNU ld bugzilla issue 22589. */ |
| 32 | ldr x1, =console_\_driver\()_putc |
| 33 | str x1, [x0, #CONSOLE_T_PUTC] |
| 34 | ldr x1, =console_\_driver\()_getc |
| 35 | str x1, [x0, #CONSOLE_T_GETC] |
| 36 | ldr x1, =console_\_driver\()_flush |
| 37 | str x1, [x0, #CONSOLE_T_FLUSH] |
| 38 | mov x1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH) |
| 39 | str x1, [x0, #CONSOLE_T_FLAGS] |
| 40 | b console_register |
| 41 | .endm |
| 42 | |
| 43 | #endif /* __CONSOLE_MACROS_S__ */ |