xref: /freebsd/sys/dev/acpica/acpivar.h (revision 3b8f08459569bf0faa21473e5cec2491e95c9349)
1 /*-
2  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
3  * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4  * Copyright (c) 2000 BSDi
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  *
28  * $FreeBSD$
29  */
30 
31 #ifndef _ACPIVAR_H_
32 #define _ACPIVAR_H_
33 
34 #ifdef _KERNEL
35 
36 #include "acpi_if.h"
37 #include "bus_if.h"
38 #include <sys/eventhandler.h>
39 #include <sys/ktr.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42 #include <sys/selinfo.h>
43 #include <sys/sx.h>
44 #include <sys/sysctl.h>
45 
46 #include <machine/bus.h>
47 #include <machine/resource.h>
48 
49 struct apm_clone_data;
50 struct acpi_softc {
51     device_t		acpi_dev;
52     struct cdev		*acpi_dev_t;
53 
54     int			acpi_enabled;
55     int			acpi_sstate;
56     int			acpi_sleep_disabled;
57     int			acpi_resources_reserved;
58 
59     struct sysctl_ctx_list acpi_sysctl_ctx;
60     struct sysctl_oid	*acpi_sysctl_tree;
61     int			acpi_power_button_sx;
62     int			acpi_sleep_button_sx;
63     int			acpi_lid_switch_sx;
64 
65     int			acpi_standby_sx;
66     int			acpi_suspend_sx;
67 
68     int			acpi_sleep_delay;
69     int			acpi_s4bios;
70     int			acpi_do_disable;
71     int			acpi_verbose;
72     int			acpi_handle_reboot;
73 
74     vm_offset_t		acpi_wakeaddr;
75     vm_paddr_t		acpi_wakephys;
76 
77     int			acpi_next_sstate;	/* Next suspend Sx state. */
78     struct apm_clone_data *acpi_clone;		/* Pseudo-dev for devd(8). */
79     STAILQ_HEAD(,apm_clone_data) apm_cdevs;	/* All apm/apmctl/acpi cdevs. */
80     struct callout	susp_force_to;		/* Force suspend if no acks. */
81 };
82 
83 struct acpi_device {
84     /* ACPI ivars */
85     ACPI_HANDLE			ad_handle;
86     void			*ad_private;
87     int				ad_flags;
88 
89     /* Resources */
90     struct resource_list	ad_rl;
91 };
92 
93 /* Track device (/dev/{apm,apmctl} and /dev/acpi) notification status. */
94 struct apm_clone_data {
95     STAILQ_ENTRY(apm_clone_data) entries;
96     struct cdev 	*cdev;
97     int			flags;
98 #define	ACPI_EVF_NONE	0	/* /dev/apm semantics */
99 #define	ACPI_EVF_DEVD	1	/* /dev/acpi is handled via devd(8) */
100 #define	ACPI_EVF_WRITE	2	/* Device instance is opened writable. */
101     int			notify_status;
102 #define	APM_EV_NONE	0	/* Device not yet aware of pending sleep. */
103 #define	APM_EV_NOTIFIED	1	/* Device saw next sleep state. */
104 #define	APM_EV_ACKED	2	/* Device agreed sleep can occur. */
105     struct acpi_softc	*acpi_sc;
106     struct selinfo	sel_read;
107 };
108 
109 #define ACPI_PRW_MAX_POWERRES	8
110 
111 struct acpi_prw_data {
112     ACPI_HANDLE		gpe_handle;
113     int			gpe_bit;
114     int			lowest_wake;
115     ACPI_OBJECT		power_res[ACPI_PRW_MAX_POWERRES];
116     int			power_res_count;
117 };
118 
119 /* Flags for each device defined in the AML namespace. */
120 #define ACPI_FLAG_WAKE_ENABLED	0x1
121 
122 /* Macros for extracting parts of a PCI address from an _ADR value. */
123 #define	ACPI_ADR_PCI_SLOT(adr)	(((adr) & 0xffff0000) >> 16)
124 #define	ACPI_ADR_PCI_FUNC(adr)	((adr) & 0xffff)
125 
126 /*
127  * Entry points to ACPI from above are global functions defined in this
128  * file, sysctls, and I/O on the control device.  Entry points from below
129  * are interrupts (the SCI), notifies, task queue threads, and the thermal
130  * zone polling thread.
131  *
132  * ACPI tables and global shared data are protected by a global lock
133  * (acpi_mutex).
134  *
135  * Each ACPI device can have its own driver-specific mutex for protecting
136  * shared access to local data.  The ACPI_LOCK macros handle mutexes.
137  *
138  * Drivers that need to serialize access to functions (e.g., to route
139  * interrupts, get/set control paths, etc.) should use the sx lock macros
140  * (ACPI_SERIAL).
141  *
142  * ACPI-CA handles its own locking and should not be called with locks held.
143  *
144  * The most complicated path is:
145  *     GPE -> EC runs _Qxx -> _Qxx reads EC space -> GPE
146  */
147 extern struct mtx			acpi_mutex;
148 #define ACPI_LOCK(sys)			mtx_lock(&sys##_mutex)
149 #define ACPI_UNLOCK(sys)		mtx_unlock(&sys##_mutex)
150 #define ACPI_LOCK_ASSERT(sys)		mtx_assert(&sys##_mutex, MA_OWNED);
151 #define ACPI_LOCK_DECL(sys, name)				\
152 	static struct mtx sys##_mutex;				\
153 	MTX_SYSINIT(sys##_mutex, &sys##_mutex, name, MTX_DEF)
154 #define ACPI_SERIAL_BEGIN(sys)		sx_xlock(&sys##_sxlock)
155 #define ACPI_SERIAL_END(sys)		sx_xunlock(&sys##_sxlock)
156 #define ACPI_SERIAL_ASSERT(sys)		sx_assert(&sys##_sxlock, SX_XLOCKED);
157 #define ACPI_SERIAL_DECL(sys, name)				\
158 	static struct sx sys##_sxlock;				\
159 	SX_SYSINIT(sys##_sxlock, &sys##_sxlock, name)
160 
161 /*
162  * ACPI CA does not define layers for non-ACPI CA drivers.
163  * We define some here within the range provided.
164  */
165 #define	ACPI_AC_ADAPTER		0x00010000
166 #define	ACPI_BATTERY		0x00020000
167 #define	ACPI_BUS		0x00040000
168 #define	ACPI_BUTTON		0x00080000
169 #define	ACPI_EC			0x00100000
170 #define	ACPI_FAN		0x00200000
171 #define	ACPI_POWERRES		0x00400000
172 #define	ACPI_PROCESSOR		0x00800000
173 #define	ACPI_THERMAL		0x01000000
174 #define	ACPI_TIMER		0x02000000
175 #define	ACPI_OEM		0x04000000
176 
177 /*
178  * Constants for different interrupt models used with acpi_SetIntrModel().
179  */
180 #define	ACPI_INTR_PIC		0
181 #define	ACPI_INTR_APIC		1
182 #define	ACPI_INTR_SAPIC		2
183 
184 /*
185  * Various features and capabilities for the acpi_get_features() method.
186  * In particular, these are used for the ACPI 3.0 _PDC and _OSC methods.
187  * See the Intel document titled "Intel Processor Vendor-Specific ACPI",
188  * number 302223-005.
189  */
190 #define	ACPI_CAP_PERF_MSRS	(1 << 0)  /* Intel SpeedStep PERF_CTL MSRs */
191 #define	ACPI_CAP_C1_IO_HALT	(1 << 1)  /* Intel C1 "IO then halt" sequence */
192 #define	ACPI_CAP_THR_MSRS	(1 << 2)  /* Intel OnDemand throttling MSRs */
193 #define	ACPI_CAP_SMP_SAME	(1 << 3)  /* MP C1, Px, and Tx (all the same) */
194 #define	ACPI_CAP_SMP_SAME_C3	(1 << 4)  /* MP C2 and C3 (all the same) */
195 #define	ACPI_CAP_SMP_DIFF_PX	(1 << 5)  /* MP Px (different, using _PSD) */
196 #define	ACPI_CAP_SMP_DIFF_CX	(1 << 6)  /* MP Cx (different, using _CSD) */
197 #define	ACPI_CAP_SMP_DIFF_TX	(1 << 7)  /* MP Tx (different, using _TSD) */
198 #define	ACPI_CAP_SMP_C1_NATIVE	(1 << 8)  /* MP C1 support other than halt */
199 #define	ACPI_CAP_SMP_C3_NATIVE	(1 << 9)  /* MP C2 and C3 support */
200 #define	ACPI_CAP_PX_HW_COORD	(1 << 11) /* Intel P-state HW coordination */
201 
202 /*
203  * Quirk flags.
204  *
205  * ACPI_Q_BROKEN: Disables all ACPI support.
206  * ACPI_Q_TIMER: Disables support for the ACPI timer.
207  * ACPI_Q_MADT_IRQ0: Specifies that ISA IRQ 0 is wired up to pin 0 of the
208  *	first APIC and that the MADT should force that by ignoring the PC-AT
209  *	compatible flag and ignoring overrides that redirect IRQ 0 to pin 2.
210  */
211 extern int	acpi_quirks;
212 #define ACPI_Q_OK		0
213 #define ACPI_Q_BROKEN		(1 << 0)
214 #define ACPI_Q_TIMER		(1 << 1)
215 #define ACPI_Q_MADT_IRQ0	(1 << 2)
216 
217 /*
218  * Note that the low ivar values are reserved to provide
219  * interface compatibility with ISA drivers which can also
220  * attach to ACPI.
221  */
222 #define ACPI_IVAR_HANDLE	0x100
223 #define ACPI_IVAR_UNUSED	0x101	/* Unused/reserved. */
224 #define ACPI_IVAR_PRIVATE	0x102
225 #define ACPI_IVAR_FLAGS		0x103
226 
227 /*
228  * Accessor functions for our ivars.  Default value for BUS_READ_IVAR is
229  * (type) 0.  The <sys/bus.h> accessor functions don't check return values.
230  */
231 #define __ACPI_BUS_ACCESSOR(varp, var, ivarp, ivar, type)	\
232 								\
233 static __inline type varp ## _get_ ## var(device_t dev)		\
234 {								\
235     uintptr_t v = 0;						\
236     BUS_READ_IVAR(device_get_parent(dev), dev,			\
237 	ivarp ## _IVAR_ ## ivar, &v);				\
238     return ((type) v);						\
239 }								\
240 								\
241 static __inline void varp ## _set_ ## var(device_t dev, type t)	\
242 {								\
243     uintptr_t v = (uintptr_t) t;				\
244     BUS_WRITE_IVAR(device_get_parent(dev), dev,			\
245 	ivarp ## _IVAR_ ## ivar, v);				\
246 }
247 
248 __ACPI_BUS_ACCESSOR(acpi, handle, ACPI, HANDLE, ACPI_HANDLE)
249 __ACPI_BUS_ACCESSOR(acpi, private, ACPI, PRIVATE, void *)
250 __ACPI_BUS_ACCESSOR(acpi, flags, ACPI, FLAGS, int)
251 
252 void acpi_fake_objhandler(ACPI_HANDLE h, void *data);
253 static __inline device_t
254 acpi_get_device(ACPI_HANDLE handle)
255 {
256     void *dev = NULL;
257     AcpiGetData(handle, acpi_fake_objhandler, &dev);
258     return ((device_t)dev);
259 }
260 
261 static __inline ACPI_OBJECT_TYPE
262 acpi_get_type(device_t dev)
263 {
264     ACPI_HANDLE		h;
265     ACPI_OBJECT_TYPE	t;
266 
267     if ((h = acpi_get_handle(dev)) == NULL)
268 	return (ACPI_TYPE_NOT_FOUND);
269     if (ACPI_FAILURE(AcpiGetType(h, &t)))
270 	return (ACPI_TYPE_NOT_FOUND);
271     return (t);
272 }
273 
274 /* Find the difference between two PM tick counts. */
275 static __inline uint32_t
276 acpi_TimerDelta(uint32_t end, uint32_t start)
277 {
278 
279 	if (end < start && (AcpiGbl_FADT.Flags & ACPI_FADT_32BIT_TIMER) == 0)
280 		end |= 0x01000000;
281 	return (end - start);
282 }
283 
284 #ifdef ACPI_DEBUGGER
285 void		acpi_EnterDebugger(void);
286 #endif
287 
288 #ifdef ACPI_DEBUG
289 #include <sys/cons.h>
290 #define STEP(x)		do {printf x, printf("\n"); cngetc();} while (0)
291 #else
292 #define STEP(x)
293 #endif
294 
295 #define ACPI_VPRINT(dev, acpi_sc, x...) do {			\
296     if (acpi_get_verbose(acpi_sc))				\
297 	device_printf(dev, x);					\
298 } while (0)
299 
300 /* Values for the device _STA (status) method. */
301 #define ACPI_STA_PRESENT	(1 << 0)
302 #define ACPI_STA_ENABLED	(1 << 1)
303 #define ACPI_STA_SHOW_IN_UI	(1 << 2)
304 #define ACPI_STA_FUNCTIONAL	(1 << 3)
305 #define ACPI_STA_BATT_PRESENT	(1 << 4)
306 
307 #define ACPI_DEVINFO_PRESENT(x, flags)					\
308 	(((x) & (flags)) == (flags))
309 #define ACPI_DEVICE_PRESENT(x)						\
310 	ACPI_DEVINFO_PRESENT(x, ACPI_STA_PRESENT | ACPI_STA_FUNCTIONAL)
311 #define ACPI_BATTERY_PRESENT(x)						\
312 	ACPI_DEVINFO_PRESENT(x, ACPI_STA_PRESENT | ACPI_STA_FUNCTIONAL | \
313 	    ACPI_STA_BATT_PRESENT)
314 
315 /* Callback function type for walking subtables within a table. */
316 typedef void acpi_subtable_handler(ACPI_SUBTABLE_HEADER *, void *);
317 
318 BOOLEAN		acpi_DeviceIsPresent(device_t dev);
319 BOOLEAN		acpi_BatteryIsPresent(device_t dev);
320 ACPI_STATUS	acpi_GetHandleInScope(ACPI_HANDLE parent, char *path,
321 		    ACPI_HANDLE *result);
322 ACPI_BUFFER	*acpi_AllocBuffer(int size);
323 ACPI_STATUS	acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp,
324 		    UINT32 *number);
325 ACPI_STATUS	acpi_GetInteger(ACPI_HANDLE handle, char *path,
326 		    UINT32 *number);
327 ACPI_STATUS	acpi_SetInteger(ACPI_HANDLE handle, char *path,
328 		    UINT32 number);
329 ACPI_STATUS	acpi_ForeachPackageObject(ACPI_OBJECT *obj,
330 		    void (*func)(ACPI_OBJECT *comp, void *arg), void *arg);
331 ACPI_STATUS	acpi_FindIndexedResource(ACPI_BUFFER *buf, int index,
332 		    ACPI_RESOURCE **resp);
333 ACPI_STATUS	acpi_AppendBufferResource(ACPI_BUFFER *buf,
334 		    ACPI_RESOURCE *res);
335 ACPI_STATUS	acpi_OverrideInterruptLevel(UINT32 InterruptNumber);
336 ACPI_STATUS	acpi_SetIntrModel(int model);
337 int		acpi_ReqSleepState(struct acpi_softc *sc, int state);
338 int		acpi_AckSleepState(struct apm_clone_data *clone, int error);
339 ACPI_STATUS	acpi_SetSleepState(struct acpi_softc *sc, int state);
340 int		acpi_wake_set_enable(device_t dev, int enable);
341 int		acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw);
342 ACPI_STATUS	acpi_Startup(void);
343 void		acpi_UserNotify(const char *subsystem, ACPI_HANDLE h,
344 		    uint8_t notify);
345 int		acpi_bus_alloc_gas(device_t dev, int *type, int *rid,
346 		    ACPI_GENERIC_ADDRESS *gas, struct resource **res,
347 		    u_int flags);
348 void		acpi_walk_subtables(void *first, void *end,
349 		    acpi_subtable_handler *handler, void *arg);
350 BOOLEAN		acpi_MatchHid(ACPI_HANDLE h, const char *hid);
351 
352 struct acpi_parse_resource_set {
353     void	(*set_init)(device_t dev, void *arg, void **context);
354     void	(*set_done)(device_t dev, void *context);
355     void	(*set_ioport)(device_t dev, void *context, uint64_t base,
356 		    uint64_t length);
357     void	(*set_iorange)(device_t dev, void *context, uint64_t low,
358 		    uint64_t high, uint64_t length, uint64_t align);
359     void	(*set_memory)(device_t dev, void *context, uint64_t base,
360 		    uint64_t length);
361     void	(*set_memoryrange)(device_t dev, void *context, uint64_t low,
362 		    uint64_t high, uint64_t length, uint64_t align);
363     void	(*set_irq)(device_t dev, void *context, uint8_t *irq,
364 		    int count, int trig, int pol);
365     void	(*set_ext_irq)(device_t dev, void *context, uint32_t *irq,
366 		    int count, int trig, int pol);
367     void	(*set_drq)(device_t dev, void *context, uint8_t *drq,
368 		    int count);
369     void	(*set_start_dependent)(device_t dev, void *context,
370 		    int preference);
371     void	(*set_end_dependent)(device_t dev, void *context);
372 };
373 
374 extern struct	acpi_parse_resource_set acpi_res_parse_set;
375 
376 int		acpi_identify(void);
377 void		acpi_config_intr(device_t dev, ACPI_RESOURCE *res);
378 ACPI_STATUS	acpi_lookup_irq_resource(device_t dev, int rid,
379 		    struct resource *res, ACPI_RESOURCE *acpi_res);
380 ACPI_STATUS	acpi_parse_resources(device_t dev, ACPI_HANDLE handle,
381 		    struct acpi_parse_resource_set *set, void *arg);
382 struct resource *acpi_alloc_sysres(device_t child, int type, int *rid,
383 		    u_long start, u_long end, u_long count, u_int flags);
384 
385 /* ACPI event handling */
386 UINT32		acpi_event_power_button_sleep(void *context);
387 UINT32		acpi_event_power_button_wake(void *context);
388 UINT32		acpi_event_sleep_button_sleep(void *context);
389 UINT32		acpi_event_sleep_button_wake(void *context);
390 
391 #define ACPI_EVENT_PRI_FIRST      0
392 #define ACPI_EVENT_PRI_DEFAULT    10000
393 #define ACPI_EVENT_PRI_LAST       20000
394 
395 typedef void (*acpi_event_handler_t)(void *, int);
396 
397 EVENTHANDLER_DECLARE(acpi_sleep_event, acpi_event_handler_t);
398 EVENTHANDLER_DECLARE(acpi_wakeup_event, acpi_event_handler_t);
399 
400 /* Device power control. */
401 ACPI_STATUS	acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable);
402 ACPI_STATUS	acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state);
403 int		acpi_device_pwr_for_sleep(device_t bus, device_t dev,
404 		    int *dstate);
405 
406 /* APM emulation */
407 void		acpi_apm_init(struct acpi_softc *);
408 
409 /* Misc. */
410 static __inline struct acpi_softc *
411 acpi_device_get_parent_softc(device_t child)
412 {
413     device_t	parent;
414 
415     parent = device_get_parent(child);
416     if (parent == NULL)
417 	return (NULL);
418     return (device_get_softc(parent));
419 }
420 
421 static __inline int
422 acpi_get_verbose(struct acpi_softc *sc)
423 {
424     if (sc)
425 	return (sc->acpi_verbose);
426     return (0);
427 }
428 
429 char		*acpi_name(ACPI_HANDLE handle);
430 int		acpi_avoid(ACPI_HANDLE handle);
431 int		acpi_disabled(char *subsys);
432 int		acpi_machdep_init(device_t dev);
433 void		acpi_install_wakeup_handler(struct acpi_softc *sc);
434 int		acpi_sleep_machdep(struct acpi_softc *sc, int state);
435 int		acpi_wakeup_machdep(struct acpi_softc *sc, int state,
436 		    int sleep_result, int intr_enabled);
437 int		acpi_table_quirks(int *quirks);
438 int		acpi_machdep_quirks(int *quirks);
439 
440 /* Battery Abstraction. */
441 struct acpi_battinfo;
442 
443 int		acpi_battery_register(device_t dev);
444 int		acpi_battery_remove(device_t dev);
445 int		acpi_battery_get_units(void);
446 int		acpi_battery_get_info_expire(void);
447 int		acpi_battery_bst_valid(struct acpi_bst *bst);
448 int		acpi_battery_bif_valid(struct acpi_bif *bif);
449 int		acpi_battery_get_battinfo(device_t dev,
450 		    struct acpi_battinfo *info);
451 
452 /* Embedded controller. */
453 void		acpi_ec_ecdt_probe(device_t);
454 
455 /* AC adapter interface. */
456 int		acpi_acad_get_acline(int *);
457 
458 /* Package manipulation convenience functions. */
459 #define ACPI_PKG_VALID(pkg, size)				\
460     ((pkg) != NULL && (pkg)->Type == ACPI_TYPE_PACKAGE &&	\
461      (pkg)->Package.Count >= (size))
462 int		acpi_PkgInt(ACPI_OBJECT *res, int idx, UINT64 *dst);
463 int		acpi_PkgInt32(ACPI_OBJECT *res, int idx, uint32_t *dst);
464 int		acpi_PkgStr(ACPI_OBJECT *res, int idx, void *dst, size_t size);
465 int		acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type,
466 		    int *rid, struct resource **dst, u_int flags);
467 ACPI_HANDLE	acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj);
468 
469 /*
470  * Base level for BUS_ADD_CHILD.  Special devices are added at orders less
471  * than this, and normal devices at or above this level.  This keeps the
472  * probe order sorted so that things like sysresource are available before
473  * their children need them.
474  */
475 #define	ACPI_DEV_BASE_ORDER	100
476 
477 /* Default maximum number of tasks to enqueue. */
478 #ifndef ACPI_MAX_TASKS
479 #define	ACPI_MAX_TASKS		MAX(32, MAXCPU * 4)
480 #endif
481 
482 /* Default number of task queue threads to start. */
483 #ifndef ACPI_MAX_THREADS
484 #define ACPI_MAX_THREADS	3
485 #endif
486 
487 /* Use the device logging level for ktr(4). */
488 #define	KTR_ACPI		KTR_DEV
489 
490 SYSCTL_DECL(_debug_acpi);
491 
492 #endif /* _KERNEL */
493 #endif /* !_ACPIVAR_H_ */
494