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/*
* Copyright (c) 2017-2018, 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.
*/
/*
* The USE_FINISH_CONSOLE_REG_2 guard is introduced to allow selection between
* the 2 variants of the finish_console_register macro and will be removed
* once the deprecated variant is removed.
*/
#ifndef USE_FINISH_CONSOLE_REG_2
#if !ERROR_DEPRECATED
/* This version of the macro is deprecated. Use the new version */
.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 /* ERROR_DEPRECATED */
#else /* USE_FINISH_CONSOLE_REG_2 */
/* The new version of the macro not using weak references */
.macro finish_console_register _driver, putc=0, getc=0, flush=0
/*
* If any of the callback is not specified or set as 0, then the
* corresponding callback entry in console_t is set to 0.
*/
.ifne \putc
adrp x1, console_\_driver\()_putc
add x1, x1, :lo12:console_\_driver\()_putc
str x1, [x0, #CONSOLE_T_PUTC]
.else
str xzr, [x0, #CONSOLE_T_PUTC]
.endif
.ifne \getc
adrp x1, console_\_driver\()_getc
add x1, x1, :lo12:console_\_driver\()_getc
str x1, [x0, #CONSOLE_T_GETC]
.else
str xzr, [x0, #CONSOLE_T_GETC]
.endif
.ifne \flush
adrp x1, console_\_driver\()_flush
add x1, x1, :lo12:console_\_driver\()_flush
str x1, [x0, #CONSOLE_T_FLUSH]
.else
str xzr, [x0, #CONSOLE_T_FLUSH]
.endif
mov x1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH)
str x1, [x0, #CONSOLE_T_FLAGS]
b console_register
.endm
#endif /* USE_FINISH_CONSOLE_REG_2 */
#endif /* CONSOLE_MACROS_S */
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