44 lines
1.5 KiB
ArmAsm
44 lines
1.5 KiB
ArmAsm
|
/*
|
||
|
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
|
||
|
*
|
||
|
* SPDX-License-Identifier: BSD-3-Clause
|
||
|
*/
|
||
|
#ifndef __CONSOLE_MACROS_S__
|
||
|
#define __CONSOLE_MACROS_S__
|
||
|
|
||
|
#include <console.h>
|
||
|
|
||
|
/*
|
||
|
* This macro encapsulates the common setup that has to be done at the end of
|
||
|
* a console driver's register function. It will register all of the driver's
|
||
|
* callbacks in the console_t structure and initialize the flags field (by
|
||
|
* default consoles are enabled for the "boot" and "crash" states, this can be
|
||
|
* changed after registration with the console_set_scope() function). It ends
|
||
|
* with a tail call that will include return to the caller.
|
||
|
* REQUIRES console_t pointer in x0 and a valid return address in x30.
|
||
|
*/
|
||
|
.macro finish_console_register _driver
|
||
|
/*
|
||
|
* Add these weak definitions so we will automatically write a 0 if the
|
||
|
* function doesn't exist. I'd rather use .ifdef but that only works if
|
||
|
* the function was defined (not just declared .global) above this point
|
||
|
* in the file, which we can't guarantee.
|
||
|
*/
|
||
|
.weak console_\_driver\()_putc
|
||
|
.weak console_\_driver\()_getc
|
||
|
.weak console_\_driver\()_flush
|
||
|
|
||
|
/* Don't use adrp on weak funcs! See GNU ld bugzilla issue 22589. */
|
||
|
ldr x1, =console_\_driver\()_putc
|
||
|
str x1, [x0, #CONSOLE_T_PUTC]
|
||
|
ldr x1, =console_\_driver\()_getc
|
||
|
str x1, [x0, #CONSOLE_T_GETC]
|
||
|
ldr x1, =console_\_driver\()_flush
|
||
|
str x1, [x0, #CONSOLE_T_FLUSH]
|
||
|
mov x1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH)
|
||
|
str x1, [x0, #CONSOLE_T_FLAGS]
|
||
|
b console_register
|
||
|
.endm
|
||
|
|
||
|
#endif /* __CONSOLE_MACROS_S__ */
|