[apple/xnu.git] / osfmk / i386 / locks.h

/*
 * Copyright (c) 2004-2012 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#ifndef	_I386_LOCKS_H_
#define	_I386_LOCKS_H_

#include <sys/appleapiopts.h>
#include <kern/kern_types.h>

#ifdef	MACH_KERNEL_PRIVATE

#include <i386/hw_lock_types.h>

extern	unsigned int	LcksOpts;

#define enaLkDeb		0x00000001	/* Request debug in default attribute */
#define enaLkStat		0x00000002	/* Request statistic in default attribute */
#define disLkRWPrio		0x00000004	/* Disable RW lock priority promotion */

#endif /* MACH_KERNEL_PRIVATE */

#if	defined(MACH_KERNEL_PRIVATE)
typedef struct {
	volatile uintptr_t	interlock;
#if	MACH_LDEBUG
	unsigned long   lck_spin_pad[9];	/* XXX - usimple_lock_data_t */
#endif
} lck_spin_t;

#define	LCK_SPIN_TAG_DESTROYED		0x00002007	/* lock marked as Destroyed */

#else /* MACH_KERNEL_PRIVATE */
#ifdef	KERNEL_PRIVATE
typedef struct {
	unsigned long    opaque[10];
} lck_spin_t;
#else /* KERNEL_PRIVATE */
typedef	struct __lck_spin_t__	lck_spin_t;
#endif
#endif

#ifdef	MACH_KERNEL_PRIVATE
/* The definition of this structure, including the layout of the
 * state bitfield, is tailored to the asm implementation in i386_lock.s
 */
typedef struct _lck_mtx_ {
	union {
		struct {
			volatile uintptr_t		lck_mtxd_owner;
			union {
				struct {
					volatile uint32_t
						lck_mtxd_waiters:16,
						lck_mtxd_pri:8,
						lck_mtxd_ilocked:1,
						lck_mtxd_mlocked:1,
						lck_mtxd_promoted:1,
						lck_mtxd_spin:1,
						lck_mtxd_is_ext:1,
						lck_mtxd_pad3:3;
				};
					uint32_t	lck_mtxd_state;
			};
			/* Pad field used as a canary, initialized to ~0 */
			uint32_t			lck_mtxd_pad32;
		} lck_mtxd;
		struct {
			struct _lck_mtx_ext_		*lck_mtxi_ptr;
			uint32_t			lck_mtxi_tag;
			uint32_t			lck_mtxi_pad32;
		} lck_mtxi;
	} lck_mtx_sw;
} lck_mtx_t;

#define	lck_mtx_owner	lck_mtx_sw.lck_mtxd.lck_mtxd_owner
#define	lck_mtx_waiters	lck_mtx_sw.lck_mtxd.lck_mtxd_waiters
#define	lck_mtx_pri	lck_mtx_sw.lck_mtxd.lck_mtxd_pri
#define	lck_mtx_promoted lck_mtx_sw.lck_mtxd.lck_mtxd_promoted
#define lck_mtx_is_ext  lck_mtx_sw.lck_mtxd.lck_mtxd_is_ext

#define lck_mtx_tag	lck_mtx_sw.lck_mtxi.lck_mtxi_tag
#define lck_mtx_ptr	lck_mtx_sw.lck_mtxi.lck_mtxi_ptr
#define lck_mtx_state	lck_mtx_sw.lck_mtxd.lck_mtxd_state
/* This pattern must subsume the interlocked, mlocked and spin bits */
#define	LCK_MTX_TAG_INDIRECT			0x07ff1007	/* lock marked as Indirect  */
#define	LCK_MTX_TAG_DESTROYED			0x07fe2007	/* lock marked as Destroyed */

/* Adaptive spin before blocking */
extern unsigned int	MutexSpin;
extern int		lck_mtx_lock_spinwait_x86(lck_mtx_t *mutex);
extern void		lck_mtx_lock_wait_x86(lck_mtx_t *mutex);
extern void		lck_mtx_lock_acquire_x86(lck_mtx_t *mutex);
extern void		lck_mtx_unlock_wakeup_x86(lck_mtx_t *mutex, int prior_lock_state);

extern void		lck_mtx_lock_mark_destroyed(lck_mtx_t *mutex);
extern int		lck_mtx_lock_grab_mutex(lck_mtx_t *mutex);

extern void		hw_lock_byte_init(volatile uint8_t *lock_byte);
extern void		hw_lock_byte_lock(volatile uint8_t *lock_byte);
extern void		hw_lock_byte_unlock(volatile uint8_t *lock_byte);

typedef struct {
	unsigned int		type;
	unsigned int		pad4;
	vm_offset_t		pc;
	vm_offset_t		thread;
} lck_mtx_deb_t;

#define MUTEX_TAG       0x4d4d

typedef struct {
	unsigned int		lck_mtx_stat_data;
} lck_mtx_stat_t;

typedef struct _lck_mtx_ext_ {
	lck_mtx_t		lck_mtx;
	struct _lck_grp_	*lck_mtx_grp;
	unsigned int		lck_mtx_attr;
	unsigned int		lck_mtx_pad1;
	lck_mtx_deb_t		lck_mtx_deb;
	uint64_t		lck_mtx_stat;
	unsigned int		lck_mtx_pad2[2];
} lck_mtx_ext_t;

#define	LCK_MTX_ATTR_DEBUG	0x1
#define	LCK_MTX_ATTR_DEBUGb	0
#define	LCK_MTX_ATTR_STAT	0x2
#define	LCK_MTX_ATTR_STATb	1

#else /* MACH_KERNEL_PRIVATE */
#ifdef	XNU_KERNEL_PRIVATE
typedef struct {
	unsigned long		opaque[2];
} lck_mtx_t;

typedef struct {
	unsigned long		opaque[10];
} lck_mtx_ext_t;
#else
#ifdef	KERNEL_PRIVATE
typedef struct {
	unsigned long		opaque[2];
} lck_mtx_t;

typedef struct {
	unsigned long		opaque[10];
} lck_mtx_ext_t;

#else
typedef struct __lck_mtx_t__		lck_mtx_t;
typedef struct __lck_mtx_ext_t__	lck_mtx_ext_t;
#endif
#endif
#endif

#ifdef	MACH_KERNEL_PRIVATE
#pragma pack(1)		/* Make sure the structure stays as we defined it */
typedef struct _lck_rw_t_internal_ {
	volatile uint16_t	lck_rw_shared_count;	/* No. of accepted readers */
	volatile uint8_t	lck_rw_interlock; 	/* Interlock byte */
	volatile uint8_t
				lck_rw_priv_excl:1,	/* Writers prioritized if set */
				lck_rw_want_upgrade:1,	/* Read-to-write upgrade waiting */
				lck_rw_want_write:1,	/* Writer waiting or locked for write */
				lck_r_waiting:1,	/* Reader is sleeping on lock */
				lck_w_waiting:1,	/* Writer is sleeping on lock */
				lck_rw_can_sleep:1,	/* Can attempts to lock go to sleep? */
				lck_rw_padb6:2; 		/* padding */

	uint32_t		lck_rw_tag; /* This can be obsoleted when stats
					     * are in
					     */
	uint32_t		lck_rw_pad8;
	uint32_t		lck_rw_pad12;
} lck_rw_t;
#pragma pack()

#define	LCK_RW_ATTR_DEBUG	0x1
#define	LCK_RW_ATTR_DEBUGb	0
#define	LCK_RW_ATTR_STAT	0x2
#define	LCK_RW_ATTR_STATb	1
#define LCK_RW_ATTR_READ_PRI	0x3
#define LCK_RW_ATTR_READ_PRIb	2
#define	LCK_RW_ATTR_DIS_THREAD	0x40000000
#define	LCK_RW_ATTR_DIS_THREADb	30
#define	LCK_RW_ATTR_DIS_MYLOCK	0x10000000
#define	LCK_RW_ATTR_DIS_MYLOCKb	28

#define	LCK_RW_TAG_DESTROYED		0x00002007	/* lock marked as Destroyed */

#else
#ifdef	KERNEL_PRIVATE
#pragma pack(1)
typedef struct {
	uint32_t		opaque[3];
	uint32_t		opaque4;
} lck_rw_t;
#pragma pack()
#else
typedef struct __lck_rw_t__	lck_rw_t;
#endif
#endif

#ifdef MACH_KERNEL_PRIVATE

extern void		kernel_preempt_check (void);

#endif /* MACH_KERNEL_PRIVATE */

#endif	/* _I386_LOCKS_H_ */
Commit	Line	Data
91447636	1	/*
39236c6e	2	* Copyright (c) 2004-2012 Apple Inc. All rights reserved.
91447636	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
91447636	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
91447636 A	27	*/
	28
	29	#ifndef _I386_LOCKS_H_
	30	#define _I386_LOCKS_H_
	31
	32	#include <sys/appleapiopts.h>
	33	#include <kern/kern_types.h>
	34
	35	#ifdef MACH_KERNEL_PRIVATE
	36
	37	#include <i386/hw_lock_types.h>
	38
	39	extern unsigned int LcksOpts;
	40
	41	#define enaLkDeb 0x00000001 /* Request debug in default attribute */
	42	#define enaLkStat 0x00000002 /* Request statistic in default attribute */
39236c6e	43	#define disLkRWPrio 0x00000004 /* Disable RW lock priority promotion */
91447636	44
6d2010ae	45	#endif /* MACH_KERNEL_PRIVATE */
91447636	46
6d2010ae	47	#if defined(MACH_KERNEL_PRIVATE)
91447636	48	typedef struct {
6d2010ae A	49	volatile uintptr_t interlock;
	50	#if MACH_LDEBUG
	51	unsigned long lck_spin_pad[9]; /* XXX - usimple_lock_data_t */
	52	#endif
91447636 A	53	} lck_spin_t;
	54
	55	#define LCK_SPIN_TAG_DESTROYED 0x00002007 /* lock marked as Destroyed */
	56
6d2010ae	57	#else /* MACH_KERNEL_PRIVATE */
91447636 A	58	#ifdef KERNEL_PRIVATE
91447636 A	59	typedef struct {
b0d623f7	60	unsigned long opaque[10];
91447636	61	} lck_spin_t;
6d2010ae	62	#else /* KERNEL_PRIVATE */
91447636 A	63	typedef struct __lck_spin_t__ lck_spin_t;
	64	#endif
	65	#endif
	66
	67	#ifdef MACH_KERNEL_PRIVATE
6d2010ae A	68	/* The definition of this structure, including the layout of the
	69	* state bitfield, is tailored to the asm implementation in i386_lock.s
	70	*/
91447636 A	71	typedef struct _lck_mtx_ {
	72	union {
	73	struct {
b0d623f7	74	volatile uintptr_t lck_mtxd_owner;
6d2010ae A	75	union {
	76	struct {
	77	volatile uint32_t
	78	lck_mtxd_waiters:16,
	79	lck_mtxd_pri:8,
	80	lck_mtxd_ilocked:1,
	81	lck_mtxd_mlocked:1,
	82	lck_mtxd_promoted:1,
	83	lck_mtxd_spin:1,
	84	lck_mtxd_is_ext:1,
	85	lck_mtxd_pad3:3;
	86	};
	87	uint32_t lck_mtxd_state;
	88	};
6d2010ae A	89	/* Pad field used as a canary, initialized to ~0 */
6d2010ae A	90	uint32_t lck_mtxd_pad32;
91447636 A	91	} lck_mtxd;
91447636 A	92	struct {
2d21ac55	93	struct _lck_mtx_ext_ *lck_mtxi_ptr;
6d2010ae	94	uint32_t lck_mtxi_tag;
6d2010ae	95	uint32_t lck_mtxi_pad32;
91447636 A	96	} lck_mtxi;
	97	} lck_mtx_sw;
	98	} lck_mtx_t;
	99
b0d623f7	100	#define lck_mtx_owner lck_mtx_sw.lck_mtxd.lck_mtxd_owner
91447636 A	101	#define lck_mtx_waiters lck_mtx_sw.lck_mtxd.lck_mtxd_waiters
91447636 A	102	#define lck_mtx_pri lck_mtx_sw.lck_mtxd.lck_mtxd_pri
b0d623f7	103	#define lck_mtx_promoted lck_mtx_sw.lck_mtxd.lck_mtxd_promoted
6d2010ae	104	#define lck_mtx_is_ext lck_mtx_sw.lck_mtxd.lck_mtxd_is_ext
91447636 A	105
	106	#define lck_mtx_tag lck_mtx_sw.lck_mtxi.lck_mtxi_tag
	107	#define lck_mtx_ptr lck_mtx_sw.lck_mtxi.lck_mtxi_ptr
6d2010ae A	108	#define lck_mtx_state lck_mtx_sw.lck_mtxd.lck_mtxd_state
	109	/* This pattern must subsume the interlocked, mlocked and spin bits */
	110	#define LCK_MTX_TAG_INDIRECT 0x07ff1007 /* lock marked as Indirect */
	111	#define LCK_MTX_TAG_DESTROYED 0x07fe2007 /* lock marked as Destroyed */
91447636	112
0c530ab8 A	113	/* Adaptive spin before blocking */
0c530ab8 A	114	extern unsigned int MutexSpin;
b0d623f7 A	115	extern int lck_mtx_lock_spinwait_x86(lck_mtx_t *mutex);
	116	extern void lck_mtx_lock_wait_x86(lck_mtx_t *mutex);
	117	extern void lck_mtx_lock_acquire_x86(lck_mtx_t *mutex);
6d2010ae	118	extern void lck_mtx_unlock_wakeup_x86(lck_mtx_t *mutex, int prior_lock_state);
2d21ac55	119
b0d623f7	120	extern void lck_mtx_lock_mark_destroyed(lck_mtx_t *mutex);
b0d623f7	121	extern int lck_mtx_lock_grab_mutex(lck_mtx_t *mutex);
0c530ab8	122
316670eb A	123	extern void hw_lock_byte_init(volatile uint8_t *lock_byte);
	124	extern void hw_lock_byte_lock(volatile uint8_t *lock_byte);
	125	extern void hw_lock_byte_unlock(volatile uint8_t *lock_byte);
0c530ab8	126
91447636 A	127	typedef struct {
91447636 A	128	unsigned int type;
b0d623f7	129	unsigned int pad4;
91447636 A	130	vm_offset_t pc;
	131	vm_offset_t thread;
	132	} lck_mtx_deb_t;
	133
	134	#define MUTEX_TAG 0x4d4d
	135
	136	typedef struct {
	137	unsigned int lck_mtx_stat_data;
	138	} lck_mtx_stat_t;
	139
	140	typedef struct _lck_mtx_ext_ {
	141	lck_mtx_t lck_mtx;
	142	struct _lck_grp_ *lck_mtx_grp;
	143	unsigned int lck_mtx_attr;
b0d623f7	144	unsigned int lck_mtx_pad1;
91447636	145	lck_mtx_deb_t lck_mtx_deb;
2d21ac55	146	uint64_t lck_mtx_stat;
b0d623f7	147	unsigned int lck_mtx_pad2[2];
91447636 A	148	} lck_mtx_ext_t;
	149
	150	#define LCK_MTX_ATTR_DEBUG 0x1
0c530ab8	151	#define LCK_MTX_ATTR_DEBUGb 0
91447636	152	#define LCK_MTX_ATTR_STAT 0x2
0c530ab8	153	#define LCK_MTX_ATTR_STATb 1
91447636	154
6d2010ae A	155	#else /* MACH_KERNEL_PRIVATE */
	156	#ifdef XNU_KERNEL_PRIVATE
	157	typedef struct {
	158	unsigned long opaque[2];
	159	} lck_mtx_t;
	160
	161	typedef struct {
	162	unsigned long opaque[10];
	163	} lck_mtx_ext_t;
91447636 A	164	#else
	165	#ifdef KERNEL_PRIVATE
	166	typedef struct {
6d2010ae	167	unsigned long opaque[2];
91447636	168	} lck_mtx_t;
b0d623f7 A	169
	170	typedef struct {
	171	unsigned long opaque[10];
	172	} lck_mtx_ext_t;
	173
91447636	174	#else
b0d623f7 A	175	typedef struct __lck_mtx_t__ lck_mtx_t;
b0d623f7 A	176	typedef struct __lck_mtx_ext_t__ lck_mtx_ext_t;
91447636 A	177	#endif
91447636 A	178	#endif
6d2010ae	179	#endif
91447636 A	180
91447636 A	181	#ifdef MACH_KERNEL_PRIVATE
2d21ac55	182	#pragma pack(1) /* Make sure the structure stays as we defined it */
b0d623f7	183	typedef struct _lck_rw_t_internal_ {
2d21ac55	184	volatile uint16_t lck_rw_shared_count; /* No. of accepted readers */
316670eb	185	volatile uint8_t lck_rw_interlock; /* Interlock byte */
2d21ac55 A	186	volatile uint8_t
	187	lck_rw_priv_excl:1, /* Writers prioritized if set */
	188	lck_rw_want_upgrade:1, /* Read-to-write upgrade waiting */
	189	lck_rw_want_write:1, /* Writer waiting or locked for write */
	190	lck_r_waiting:1, /* Reader is sleeping on lock */
	191	lck_w_waiting:1, /* Writer is sleeping on lock */
	192	lck_rw_can_sleep:1, /* Can attempts to lock go to sleep? */
b0d623f7	193	lck_rw_padb6:2; /* padding */
2d21ac55	194
b0d623f7	195	uint32_t lck_rw_tag; /* This can be obsoleted when stats
2d21ac55 A	196	* are in
2d21ac55 A	197	*/
b0d623f7	198	uint32_t lck_rw_pad8;
b0d623f7	199	uint32_t lck_rw_pad12;
91447636	200	} lck_rw_t;
2d21ac55	201	#pragma pack()
91447636	202
0c530ab8 A	203	#define LCK_RW_ATTR_DEBUG 0x1
	204	#define LCK_RW_ATTR_DEBUGb 0
	205	#define LCK_RW_ATTR_STAT 0x2
	206	#define LCK_RW_ATTR_STATb 1
	207	#define LCK_RW_ATTR_READ_PRI 0x3
	208	#define LCK_RW_ATTR_READ_PRIb 2
	209	#define LCK_RW_ATTR_DIS_THREAD 0x40000000
	210	#define LCK_RW_ATTR_DIS_THREADb 30
	211	#define LCK_RW_ATTR_DIS_MYLOCK 0x10000000
	212	#define LCK_RW_ATTR_DIS_MYLOCKb 28
	213
91447636 A	214	#define LCK_RW_TAG_DESTROYED 0x00002007 /* lock marked as Destroyed */
	215
	216	#else
	217	#ifdef KERNEL_PRIVATE
b0d623f7	218	#pragma pack(1)
91447636	219	typedef struct {
b0d623f7	220	uint32_t opaque[3];
b0d623f7	221	uint32_t opaque4;
91447636	222	} lck_rw_t;
b0d623f7	223	#pragma pack()
91447636 A	224	#else
	225	typedef struct __lck_rw_t__ lck_rw_t;
	226	#endif
	227	#endif
	228
fe8ab488 A	229	#ifdef MACH_KERNEL_PRIVATE
	230
	231	extern void kernel_preempt_check (void);
	232
	233	#endif /* MACH_KERNEL_PRIVATE */
	234
91447636	235	#endif /* _I386_LOCKS_H_ */