diff options
Diffstat (limited to 'include/common')
-rw-r--r-- | include/common/aarch32/console_macros.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/common/aarch32/console_macros.S b/include/common/aarch32/console_macros.S new file mode 100644 index 00000000..480e3c29 --- /dev/null +++ b/include/common/aarch32/console_macros.S @@ -0,0 +1,43 @@ +/* + * Copyright (c) 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. + */ + .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 r1, =console_\_driver\()_putc + str r1, [r0, #CONSOLE_T_PUTC] + ldr r1, =console_\_driver\()_getc + str r1, [r0, #CONSOLE_T_GETC] + ldr r1, =console_\_driver\()_flush + str r1, [r0, #CONSOLE_T_FLUSH] + mov r1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH) + str r1, [r0, #CONSOLE_T_FLAGS] + b console_register + .endm + +#endif /* __CONSOLE_MACROS_S__ */ |