1 /* 2 * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef CONSOLE_H 8 #define CONSOLE_H 9 10 #include <lib/utils_def.h> 11 12 #define CONSOLE_T_NEXT (U(0) * REGSZ) 13 #define CONSOLE_T_FLAGS (U(1) * REGSZ) 14 #define CONSOLE_T_PUTC (U(2) * REGSZ) 15 #define CONSOLE_T_GETC (U(3) * REGSZ) 16 #define CONSOLE_T_FLUSH (U(4) * REGSZ) 17 #define CONSOLE_T_DRVDATA (U(5) * REGSZ) 18 19 #define CONSOLE_FLAG_BOOT (U(1) << 0) 20 #define CONSOLE_FLAG_RUNTIME (U(1) << 1) 21 #define CONSOLE_FLAG_CRASH (U(1) << 2) 22 /* Bits 3 to 7 reserved for additional scopes in future expansion. */ 23 #define CONSOLE_FLAG_SCOPE_MASK ((U(1) << 8) - 1) 24 /* Bits 8 to 31 for non-scope use. */ 25 #define CONSOLE_FLAG_TRANSLATE_CRLF (U(1) << 8) 26 27 /* Returned by getc callbacks when receive FIFO is empty. */ 28 #define ERROR_NO_PENDING_CHAR (-1) 29 /* Returned by console_xxx() if no registered console implements xxx. */ 30 #define ERROR_NO_VALID_CONSOLE (-128) 31 32 #ifndef __ASSEMBLER__ 33 34 #include <stdint.h> 35 36 typedef struct console { 37 struct console *next; 38 /* 39 * Only the low 32 bits are used. The type is u_register_t to align the 40 * fields of the struct to 64 bits in AArch64 and 32 bits in AArch32 41 */ 42 u_register_t flags; 43 int (*const putc)(int character, struct console *console); 44 int (*const getc)(struct console *console); 45 int (*const flush)(struct console *console); 46 /* Additional private driver data may follow here. */ 47 } console_t; 48 49 /* offset macro assertions for console_t */ 50 #include <drivers/console_assertions.h> 51 52 /* 53 * Add a console_t instance to the console list. This should only be called by 54 * console drivers after they have initialized all fields in the console 55 * structure. Platforms seeking to register a new console need to call the 56 * respective console__register() function instead. 57 */ 58 int console_register(console_t *console); 59 /* Remove a single console_t instance from the console list. Return a pointer to 60 * the console that was removed if it was found, or NULL if not. */ 61 console_t *console_unregister(console_t *console); 62 /* Returns 1 if this console is already registered, 0 if not */ 63 int console_is_registered(console_t *console); 64 /* 65 * Set scope mask of a console that determines in what states it is active. 66 * By default they are registered with (CONSOLE_FLAG_BOOT|CONSOLE_FLAG_CRASH). 67 */ 68 void console_set_scope(console_t *console, unsigned int scope); 69 70 /* Switch to a new global console state (CONSOLE_FLAG_BOOT/RUNTIME/CRASH). */ 71 void console_switch_state(unsigned int new_state); 72 /* Output a character on all consoles registered for the current state. */ 73 int console_putc(int c); 74 /* Read a character (blocking) from any console registered for current state. */ 75 int console_getc(void); 76 /* Flush all consoles registered for the current state. */ 77 int console_flush(void); 78 79 #endif /* __ASSEMBLER__ */ 80 81 #endif /* CONSOLE_H */ 82