89 lines
2.8 KiB
ArmAsm
89 lines
2.8 KiB
ArmAsm
/*
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* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef CONSOLE_MACROS_S
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#define CONSOLE_MACROS_S
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#include <console.h>
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/*
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* This macro encapsulates the common setup that has to be done at the end of
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* a console driver's register function. It will register all of the driver's
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* callbacks in the console_t structure and initialize the flags field (by
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* default consoles are enabled for the "boot" and "crash" states, this can be
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* changed after registration with the console_set_scope() function). It ends
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* with a tail call that will include return to the caller.
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* REQUIRES console_t pointer in x0 and a valid return address in x30.
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*/
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/*
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* The USE_FINISH_CONSOLE_REG_2 guard is introduced to allow selection between
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* the 2 variants of the finish_console_register macro and will be removed
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* once the deprecated variant is removed.
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*/
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#ifndef USE_FINISH_CONSOLE_REG_2
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#if !ERROR_DEPRECATED
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/* This version of the macro is deprecated. Use the new version */
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.macro finish_console_register _driver
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/*
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* Add these weak definitions so we will automatically write a 0 if the
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* function doesn't exist. I'd rather use .ifdef but that only works if
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* the function was defined (not just declared .global) above this point
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* in the file, which we can't guarantee.
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*/
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.weak console_\_driver\()_putc
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.weak console_\_driver\()_getc
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.weak console_\_driver\()_flush
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/* Don't use adrp on weak funcs! See GNU ld bugzilla issue 22589. */
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ldr x1, =console_\_driver\()_putc
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str x1, [x0, #CONSOLE_T_PUTC]
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ldr x1, =console_\_driver\()_getc
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str x1, [x0, #CONSOLE_T_GETC]
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ldr x1, =console_\_driver\()_flush
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str x1, [x0, #CONSOLE_T_FLUSH]
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mov x1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH)
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str x1, [x0, #CONSOLE_T_FLAGS]
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b console_register
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.endm
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#endif /* ERROR_DEPRECATED */
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#else /* USE_FINISH_CONSOLE_REG_2 */
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/* The new version of the macro not using weak references */
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.macro finish_console_register _driver, putc=0, getc=0, flush=0
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/*
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* If any of the callback is not specified or set as 0, then the
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* corresponding callback entry in console_t is set to 0.
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*/
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.ifne \putc
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adrp x1, console_\_driver\()_putc
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add x1, x1, :lo12:console_\_driver\()_putc
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str x1, [x0, #CONSOLE_T_PUTC]
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.else
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str xzr, [x0, #CONSOLE_T_PUTC]
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.endif
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.ifne \getc
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adrp x1, console_\_driver\()_getc
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add x1, x1, :lo12:console_\_driver\()_getc
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str x1, [x0, #CONSOLE_T_GETC]
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.else
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str xzr, [x0, #CONSOLE_T_GETC]
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.endif
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.ifne \flush
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adrp x1, console_\_driver\()_flush
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add x1, x1, :lo12:console_\_driver\()_flush
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str x1, [x0, #CONSOLE_T_FLUSH]
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.else
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str xzr, [x0, #CONSOLE_T_FLUSH]
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.endif
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mov x1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH)
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str x1, [x0, #CONSOLE_T_FLAGS]
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b console_register
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.endm
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#endif /* USE_FINISH_CONSOLE_REG_2 */
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#endif /* CONSOLE_MACROS_S */
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