Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0-or-later */
2 : /*
3 : * linux/drivers/char/serial_core.h
4 : *
5 : * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 : */
7 : #ifndef LINUX_SERIAL_CORE_H
8 : #define LINUX_SERIAL_CORE_H
9 :
10 : #include <linux/bitops.h>
11 : #include <linux/compiler.h>
12 : #include <linux/console.h>
13 : #include <linux/interrupt.h>
14 : #include <linux/circ_buf.h>
15 : #include <linux/spinlock.h>
16 : #include <linux/sched.h>
17 : #include <linux/tty.h>
18 : #include <linux/mutex.h>
19 : #include <linux/sysrq.h>
20 : #include <uapi/linux/serial_core.h>
21 :
22 : #ifdef CONFIG_SERIAL_CORE_CONSOLE
23 : #define uart_console(port) \
24 : ((port)->cons && (port)->cons->index == (port)->line)
25 : #else
26 : #define uart_console(port) ({ (void)port; 0; })
27 : #endif
28 :
29 : struct uart_port;
30 : struct serial_struct;
31 : struct device;
32 : struct gpio_desc;
33 :
34 : /*
35 : * This structure describes all the operations that can be done on the
36 : * physical hardware. See Documentation/driver-api/serial/driver.rst for details.
37 : */
38 : struct uart_ops {
39 : unsigned int (*tx_empty)(struct uart_port *);
40 : void (*set_mctrl)(struct uart_port *, unsigned int mctrl);
41 : unsigned int (*get_mctrl)(struct uart_port *);
42 : void (*stop_tx)(struct uart_port *);
43 : void (*start_tx)(struct uart_port *);
44 : void (*throttle)(struct uart_port *);
45 : void (*unthrottle)(struct uart_port *);
46 : void (*send_xchar)(struct uart_port *, char ch);
47 : void (*stop_rx)(struct uart_port *);
48 : void (*enable_ms)(struct uart_port *);
49 : void (*break_ctl)(struct uart_port *, int ctl);
50 : int (*startup)(struct uart_port *);
51 : void (*shutdown)(struct uart_port *);
52 : void (*flush_buffer)(struct uart_port *);
53 : void (*set_termios)(struct uart_port *, struct ktermios *new,
54 : struct ktermios *old);
55 : void (*set_ldisc)(struct uart_port *, struct ktermios *);
56 : void (*pm)(struct uart_port *, unsigned int state,
57 : unsigned int oldstate);
58 :
59 : /*
60 : * Return a string describing the type of the port
61 : */
62 : const char *(*type)(struct uart_port *);
63 :
64 : /*
65 : * Release IO and memory resources used by the port.
66 : * This includes iounmap if necessary.
67 : */
68 : void (*release_port)(struct uart_port *);
69 :
70 : /*
71 : * Request IO and memory resources used by the port.
72 : * This includes iomapping the port if necessary.
73 : */
74 : int (*request_port)(struct uart_port *);
75 : void (*config_port)(struct uart_port *, int);
76 : int (*verify_port)(struct uart_port *, struct serial_struct *);
77 : int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
78 : #ifdef CONFIG_CONSOLE_POLL
79 : int (*poll_init)(struct uart_port *);
80 : void (*poll_put_char)(struct uart_port *, unsigned char);
81 : int (*poll_get_char)(struct uart_port *);
82 : #endif
83 : };
84 :
85 : #define NO_POLL_CHAR 0x00ff0000
86 : #define UART_CONFIG_TYPE (1 << 0)
87 : #define UART_CONFIG_IRQ (1 << 1)
88 :
89 : struct uart_icount {
90 : __u32 cts;
91 : __u32 dsr;
92 : __u32 rng;
93 : __u32 dcd;
94 : __u32 rx;
95 : __u32 tx;
96 : __u32 frame;
97 : __u32 overrun;
98 : __u32 parity;
99 : __u32 brk;
100 : __u32 buf_overrun;
101 : };
102 :
103 : typedef unsigned int __bitwise upf_t;
104 : typedef unsigned int __bitwise upstat_t;
105 :
106 : struct uart_port {
107 : spinlock_t lock; /* port lock */
108 : unsigned long iobase; /* in/out[bwl] */
109 : unsigned char __iomem *membase; /* read/write[bwl] */
110 : unsigned int (*serial_in)(struct uart_port *, int);
111 : void (*serial_out)(struct uart_port *, int, int);
112 : void (*set_termios)(struct uart_port *,
113 : struct ktermios *new,
114 : struct ktermios *old);
115 : void (*set_ldisc)(struct uart_port *,
116 : struct ktermios *);
117 : unsigned int (*get_mctrl)(struct uart_port *);
118 : void (*set_mctrl)(struct uart_port *, unsigned int);
119 : unsigned int (*get_divisor)(struct uart_port *,
120 : unsigned int baud,
121 : unsigned int *frac);
122 : void (*set_divisor)(struct uart_port *,
123 : unsigned int baud,
124 : unsigned int quot,
125 : unsigned int quot_frac);
126 : int (*startup)(struct uart_port *port);
127 : void (*shutdown)(struct uart_port *port);
128 : void (*throttle)(struct uart_port *port);
129 : void (*unthrottle)(struct uart_port *port);
130 : int (*handle_irq)(struct uart_port *);
131 : void (*pm)(struct uart_port *, unsigned int state,
132 : unsigned int old);
133 : void (*handle_break)(struct uart_port *);
134 : int (*rs485_config)(struct uart_port *,
135 : struct serial_rs485 *rs485);
136 : int (*iso7816_config)(struct uart_port *,
137 : struct serial_iso7816 *iso7816);
138 : unsigned int irq; /* irq number */
139 : unsigned long irqflags; /* irq flags */
140 : unsigned int uartclk; /* base uart clock */
141 : unsigned int fifosize; /* tx fifo size */
142 : unsigned char x_char; /* xon/xoff char */
143 : unsigned char regshift; /* reg offset shift */
144 : unsigned char iotype; /* io access style */
145 : unsigned char quirks; /* internal quirks */
146 :
147 : #define UPIO_PORT (SERIAL_IO_PORT) /* 8b I/O port access */
148 : #define UPIO_HUB6 (SERIAL_IO_HUB6) /* Hub6 ISA card */
149 : #define UPIO_MEM (SERIAL_IO_MEM) /* driver-specific */
150 : #define UPIO_MEM32 (SERIAL_IO_MEM32) /* 32b little endian */
151 : #define UPIO_AU (SERIAL_IO_AU) /* Au1x00 and RT288x type IO */
152 : #define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */
153 : #define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */
154 : #define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */
155 :
156 : /* quirks must be updated while holding port mutex */
157 : #define UPQ_NO_TXEN_TEST BIT(0)
158 :
159 : unsigned int read_status_mask; /* driver specific */
160 : unsigned int ignore_status_mask; /* driver specific */
161 : struct uart_state *state; /* pointer to parent state */
162 : struct uart_icount icount; /* statistics */
163 :
164 : struct console *cons; /* struct console, if any */
165 : /* flags must be updated while holding port mutex */
166 : upf_t flags;
167 :
168 : /*
169 : * These flags must be equivalent to the flags defined in
170 : * include/uapi/linux/tty_flags.h which are the userspace definitions
171 : * assigned from the serial_struct flags in uart_set_info()
172 : * [for bit definitions in the UPF_CHANGE_MASK]
173 : *
174 : * Bits [0..UPF_LAST_USER] are userspace defined/visible/changeable
175 : * The remaining bits are serial-core specific and not modifiable by
176 : * userspace.
177 : */
178 : #define UPF_FOURPORT ((__force upf_t) ASYNC_FOURPORT /* 1 */ )
179 : #define UPF_SAK ((__force upf_t) ASYNC_SAK /* 2 */ )
180 : #define UPF_SPD_HI ((__force upf_t) ASYNC_SPD_HI /* 4 */ )
181 : #define UPF_SPD_VHI ((__force upf_t) ASYNC_SPD_VHI /* 5 */ )
182 : #define UPF_SPD_CUST ((__force upf_t) ASYNC_SPD_CUST /* 0x0030 */ )
183 : #define UPF_SPD_WARP ((__force upf_t) ASYNC_SPD_WARP /* 0x1010 */ )
184 : #define UPF_SPD_MASK ((__force upf_t) ASYNC_SPD_MASK /* 0x1030 */ )
185 : #define UPF_SKIP_TEST ((__force upf_t) ASYNC_SKIP_TEST /* 6 */ )
186 : #define UPF_AUTO_IRQ ((__force upf_t) ASYNC_AUTO_IRQ /* 7 */ )
187 : #define UPF_HARDPPS_CD ((__force upf_t) ASYNC_HARDPPS_CD /* 11 */ )
188 : #define UPF_SPD_SHI ((__force upf_t) ASYNC_SPD_SHI /* 12 */ )
189 : #define UPF_LOW_LATENCY ((__force upf_t) ASYNC_LOW_LATENCY /* 13 */ )
190 : #define UPF_BUGGY_UART ((__force upf_t) ASYNC_BUGGY_UART /* 14 */ )
191 : #define UPF_MAGIC_MULTIPLIER ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )
192 :
193 : #define UPF_NO_THRE_TEST ((__force upf_t) (1 << 19))
194 : /* Port has hardware-assisted h/w flow control */
195 : #define UPF_AUTO_CTS ((__force upf_t) (1 << 20))
196 : #define UPF_AUTO_RTS ((__force upf_t) (1 << 21))
197 : #define UPF_HARD_FLOW ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
198 : /* Port has hardware-assisted s/w flow control */
199 : #define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
200 : #define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
201 : #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
202 : #define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
203 : #define UPF_BUG_THRE ((__force upf_t) (1 << 26))
204 : /* The exact UART type is known and should not be probed. */
205 : #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
206 : #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
207 : #define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
208 : #define UPF_DEAD ((__force upf_t) (1 << 30))
209 : #define UPF_IOREMAP ((__force upf_t) (1 << 31))
210 :
211 : #define __UPF_CHANGE_MASK 0x17fff
212 : #define UPF_CHANGE_MASK ((__force upf_t) __UPF_CHANGE_MASK)
213 : #define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
214 :
215 : #if __UPF_CHANGE_MASK > ASYNC_FLAGS
216 : #error Change mask not equivalent to userspace-visible bit defines
217 : #endif
218 :
219 : /*
220 : * Must hold termios_rwsem, port mutex and port lock to change;
221 : * can hold any one lock to read.
222 : */
223 : upstat_t status;
224 :
225 : #define UPSTAT_CTS_ENABLE ((__force upstat_t) (1 << 0))
226 : #define UPSTAT_DCD_ENABLE ((__force upstat_t) (1 << 1))
227 : #define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2))
228 : #define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3))
229 : #define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4))
230 : #define UPSTAT_SYNC_FIFO ((__force upstat_t) (1 << 5))
231 :
232 : int hw_stopped; /* sw-assisted CTS flow state */
233 : unsigned int mctrl; /* current modem ctrl settings */
234 : unsigned int timeout; /* character-based timeout */
235 : unsigned int type; /* port type */
236 : const struct uart_ops *ops;
237 : unsigned int custom_divisor;
238 : unsigned int line; /* port index */
239 : unsigned int minor;
240 : resource_size_t mapbase; /* for ioremap */
241 : resource_size_t mapsize;
242 : struct device *dev; /* parent device */
243 :
244 : unsigned long sysrq; /* sysrq timeout */
245 : unsigned int sysrq_ch; /* char for sysrq */
246 : unsigned char has_sysrq;
247 : unsigned char sysrq_seq; /* index in sysrq_toggle_seq */
248 :
249 : unsigned char hub6; /* this should be in the 8250 driver */
250 : unsigned char suspended;
251 : unsigned char console_reinit;
252 : const char *name; /* port name */
253 : struct attribute_group *attr_group; /* port specific attributes */
254 : const struct attribute_group **tty_groups; /* all attributes (serial core use only) */
255 : struct serial_rs485 rs485;
256 : struct gpio_desc *rs485_term_gpio; /* enable RS485 bus termination */
257 : struct serial_iso7816 iso7816;
258 : void *private_data; /* generic platform data pointer */
259 : };
260 :
261 2283 : static inline int serial_port_in(struct uart_port *up, int offset)
262 : {
263 2276 : return up->serial_in(up, offset);
264 : }
265 :
266 14209 : static inline void serial_port_out(struct uart_port *up, int offset, int value)
267 : {
268 14209 : up->serial_out(up, offset, value);
269 261 : }
270 :
271 : /**
272 : * enum uart_pm_state - power states for UARTs
273 : * @UART_PM_STATE_ON: UART is powered, up and operational
274 : * @UART_PM_STATE_OFF: UART is powered off
275 : * @UART_PM_STATE_UNDEFINED: sentinel
276 : */
277 : enum uart_pm_state {
278 : UART_PM_STATE_ON = 0,
279 : UART_PM_STATE_OFF = 3, /* number taken from ACPI */
280 : UART_PM_STATE_UNDEFINED,
281 : };
282 :
283 : /*
284 : * This is the state information which is persistent across opens.
285 : */
286 : struct uart_state {
287 : struct tty_port port;
288 :
289 : enum uart_pm_state pm_state;
290 : struct circ_buf xmit;
291 :
292 : atomic_t refcount;
293 : wait_queue_head_t remove_wait;
294 : struct uart_port *uart_port;
295 : };
296 :
297 : #define UART_XMIT_SIZE PAGE_SIZE
298 :
299 :
300 : /* number of characters left in xmit buffer before we ask for more */
301 : #define WAKEUP_CHARS 256
302 :
303 : struct module;
304 : struct tty_driver;
305 :
306 : struct uart_driver {
307 : struct module *owner;
308 : const char *driver_name;
309 : const char *dev_name;
310 : int major;
311 : int minor;
312 : int nr;
313 : struct console *cons;
314 :
315 : /*
316 : * these are private; the low level driver should not
317 : * touch these; they should be initialised to NULL
318 : */
319 : struct uart_state *state;
320 : struct tty_driver *tty_driver;
321 : };
322 :
323 : void uart_write_wakeup(struct uart_port *port);
324 :
325 : /*
326 : * Baud rate helpers.
327 : */
328 : void uart_update_timeout(struct uart_port *port, unsigned int cflag,
329 : unsigned int baud);
330 : unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
331 : struct ktermios *old, unsigned int min,
332 : unsigned int max);
333 : unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
334 :
335 : /* Base timer interval for polling */
336 0 : static inline int uart_poll_timeout(struct uart_port *port)
337 : {
338 0 : int timeout = port->timeout;
339 :
340 0 : return timeout > 6 ? (timeout / 2 - 2) : 1;
341 : }
342 :
343 : /*
344 : * Console helpers.
345 : */
346 : struct earlycon_device {
347 : struct console *con;
348 : struct uart_port port;
349 : char options[16]; /* e.g., 115200n8 */
350 : unsigned int baud;
351 : };
352 :
353 : struct earlycon_id {
354 : char name[15];
355 : char name_term; /* In case compiler didn't '\0' term name */
356 : char compatible[128];
357 : int (*setup)(struct earlycon_device *, const char *options);
358 : };
359 :
360 : extern const struct earlycon_id __earlycon_table[];
361 : extern const struct earlycon_id __earlycon_table_end[];
362 :
363 : #if defined(CONFIG_SERIAL_EARLYCON) && !defined(MODULE)
364 : #define EARLYCON_USED_OR_UNUSED __used
365 : #else
366 : #define EARLYCON_USED_OR_UNUSED __maybe_unused
367 : #endif
368 :
369 : #define OF_EARLYCON_DECLARE(_name, compat, fn) \
370 : static const struct earlycon_id __UNIQUE_ID(__earlycon_##_name) \
371 : EARLYCON_USED_OR_UNUSED __section("__earlycon_table") \
372 : __aligned(__alignof__(struct earlycon_id)) \
373 : = { .name = __stringify(_name), \
374 : .compatible = compat, \
375 : .setup = fn }
376 :
377 : #define EARLYCON_DECLARE(_name, fn) OF_EARLYCON_DECLARE(_name, "", fn)
378 :
379 : extern int of_setup_earlycon(const struct earlycon_id *match,
380 : unsigned long node,
381 : const char *options);
382 :
383 : #ifdef CONFIG_SERIAL_EARLYCON
384 : extern bool earlycon_acpi_spcr_enable __initdata;
385 : int setup_earlycon(char *buf);
386 : #else
387 : static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED;
388 : static inline int setup_earlycon(char *buf) { return 0; }
389 : #endif
390 :
391 : struct uart_port *uart_get_console(struct uart_port *ports, int nr,
392 : struct console *c);
393 : int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
394 : char **options);
395 : void uart_parse_options(const char *options, int *baud, int *parity, int *bits,
396 : int *flow);
397 : int uart_set_options(struct uart_port *port, struct console *co, int baud,
398 : int parity, int bits, int flow);
399 : struct tty_driver *uart_console_device(struct console *co, int *index);
400 : void uart_console_write(struct uart_port *port, const char *s,
401 : unsigned int count,
402 : void (*putchar)(struct uart_port *, int));
403 :
404 : /*
405 : * Port/driver registration/removal
406 : */
407 : int uart_register_driver(struct uart_driver *uart);
408 : void uart_unregister_driver(struct uart_driver *uart);
409 : int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
410 : int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
411 : int uart_match_port(struct uart_port *port1, struct uart_port *port2);
412 :
413 : /*
414 : * Power Management
415 : */
416 : int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
417 : int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
418 :
419 : #define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
420 : #define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
421 :
422 : #define uart_circ_chars_pending(circ) \
423 : (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
424 :
425 : #define uart_circ_chars_free(circ) \
426 : (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
427 :
428 1147 : static inline int uart_tx_stopped(struct uart_port *port)
429 : {
430 1147 : struct tty_struct *tty = port->state->port.tty;
431 1147 : if ((tty && tty->stopped) || port->hw_stopped)
432 0 : return 1;
433 : return 0;
434 : }
435 :
436 : static inline bool uart_cts_enabled(struct uart_port *uport)
437 : {
438 : return !!(uport->status & UPSTAT_CTS_ENABLE);
439 : }
440 :
441 1 : static inline bool uart_softcts_mode(struct uart_port *uport)
442 : {
443 1 : upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS;
444 :
445 1 : return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
446 : }
447 :
448 : /*
449 : * The following are helper functions for the low level drivers.
450 : */
451 :
452 : extern void uart_handle_dcd_change(struct uart_port *uport,
453 : unsigned int status);
454 : extern void uart_handle_cts_change(struct uart_port *uport,
455 : unsigned int status);
456 :
457 : extern void uart_insert_char(struct uart_port *port, unsigned int status,
458 : unsigned int overrun, unsigned int ch, unsigned int flag);
459 :
460 : #ifdef CONFIG_MAGIC_SYSRQ_SERIAL
461 : #define SYSRQ_TIMEOUT (HZ * 5)
462 :
463 : bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch);
464 :
465 : static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
466 : {
467 : if (!port->sysrq)
468 : return 0;
469 :
470 : if (ch && time_before(jiffies, port->sysrq)) {
471 : if (sysrq_mask()) {
472 : handle_sysrq(ch);
473 : port->sysrq = 0;
474 : return 1;
475 : }
476 : if (uart_try_toggle_sysrq(port, ch))
477 : return 1;
478 : }
479 : port->sysrq = 0;
480 :
481 : return 0;
482 : }
483 :
484 : static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
485 : {
486 : if (!port->sysrq)
487 : return 0;
488 :
489 : if (ch && time_before(jiffies, port->sysrq)) {
490 : if (sysrq_mask()) {
491 : port->sysrq_ch = ch;
492 : port->sysrq = 0;
493 : return 1;
494 : }
495 : if (uart_try_toggle_sysrq(port, ch))
496 : return 1;
497 : }
498 : port->sysrq = 0;
499 :
500 : return 0;
501 : }
502 :
503 : static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
504 : {
505 : int sysrq_ch;
506 :
507 : if (!port->has_sysrq) {
508 : spin_unlock_irqrestore(&port->lock, irqflags);
509 : return;
510 : }
511 :
512 : sysrq_ch = port->sysrq_ch;
513 : port->sysrq_ch = 0;
514 :
515 : spin_unlock_irqrestore(&port->lock, irqflags);
516 :
517 : if (sysrq_ch)
518 : handle_sysrq(sysrq_ch);
519 : }
520 : #else /* CONFIG_MAGIC_SYSRQ_SERIAL */
521 : static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
522 : {
523 : return 0;
524 : }
525 0 : static inline int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch)
526 : {
527 0 : return 0;
528 : }
529 750 : static inline void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags)
530 : {
531 750 : spin_unlock_irqrestore(&port->lock, irqflags);
532 : }
533 : #endif /* CONFIG_MAGIC_SYSRQ_SERIAL */
534 :
535 : /*
536 : * We do the SysRQ and SAK checking like this...
537 : */
538 0 : static inline int uart_handle_break(struct uart_port *port)
539 : {
540 0 : struct uart_state *state = port->state;
541 :
542 0 : if (port->handle_break)
543 0 : port->handle_break(port);
544 :
545 : #ifdef CONFIG_MAGIC_SYSRQ_SERIAL
546 : if (port->has_sysrq && uart_console(port)) {
547 : if (!port->sysrq) {
548 : port->sysrq = jiffies + SYSRQ_TIMEOUT;
549 : return 1;
550 : }
551 : port->sysrq = 0;
552 : }
553 : #endif
554 0 : if (port->flags & UPF_SAK)
555 0 : do_SAK(state->port.tty);
556 0 : return 0;
557 : }
558 :
559 : /*
560 : * UART_ENABLE_MS - determine if port should enable modem status irqs
561 : */
562 : #define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \
563 : (cflag) & CRTSCTS || \
564 : !((cflag) & CLOCAL))
565 :
566 : int uart_get_rs485_mode(struct uart_port *port);
567 : #endif /* LINUX_SERIAL_CORE_H */
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