X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..5ba3f43ea354af8ad55bea84372a2bc834d8757c:/osfmk/i386/locks.h diff --git a/osfmk/i386/locks.h b/osfmk/i386/locks.h index c262da07c..3d337a1c8 100644 --- a/osfmk/i386/locks.h +++ b/osfmk/i386/locks.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2004-2012 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * 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. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * 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 OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * 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_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #ifndef _I386_LOCKS_H_ @@ -31,65 +37,90 @@ #include extern unsigned int LcksOpts; +#if DEVELOPMENT || DEBUG +extern unsigned int LckDisablePreemptCheck; +#endif #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 +#endif /* MACH_KERNEL_PRIVATE */ -#ifdef MACH_KERNEL_PRIVATE +#if defined(MACH_KERNEL_PRIVATE) typedef struct { - unsigned int lck_spin_data[10]; /* XXX - usimple_lock_data_t */ + 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 +#else /* MACH_KERNEL_PRIVATE */ #ifdef KERNEL_PRIVATE typedef struct { - unsigned int opaque[10]; + unsigned long opaque[10]; } lck_spin_t; -#else +#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 { - unsigned int lck_mtxd_ilk; - unsigned int lck_mtxd_locked; - unsigned short lck_mtxd_waiters; - unsigned short lck_mtxd_pri; - } lck_mtxd; + volatile uintptr_t lck_mtx_owner; + union { + struct { + volatile uint32_t + lck_mtx_waiters:16, + lck_mtx_pri:8, + lck_mtx_ilocked:1, + lck_mtx_mlocked:1, + lck_mtx_promoted:1, + lck_mtx_spin:1, + lck_mtx_is_ext:1, + lck_mtx_pad3:3; + }; + uint32_t lck_mtx_state; + }; + /* Pad field used as a canary, initialized to ~0 */ + uint32_t lck_mtx_pad32; + }; struct { - unsigned int lck_mtxi_tag; - struct _lck_mtx_ext_ *lck_mtxi_ptr; - unsigned int lck_mtxi_pad8; - } lck_mtxi; - } lck_mtx_sw; + struct _lck_mtx_ext_ *lck_mtx_ptr; + uint32_t lck_mtx_tag; + uint32_t lck_mtx_pad32_2; + }; + }; } lck_mtx_t; -#define lck_mtx_ilk lck_mtx_sw.lck_mtxd.lck_mtxd_ilk -#define lck_mtx_locked lck_mtx_sw.lck_mtxd.lck_mtxd_locked -#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_tag lck_mtx_sw.lck_mtxi.lck_mtxi_tag -#define lck_mtx_ptr lck_mtx_sw.lck_mtxi.lck_mtxi_ptr - -#define LCK_MTX_TAG_INDIRECT 0x00001007 /* lock marked as Indirect */ -#define LCK_MTX_TAG_DESTROYED 0x00002007 /* lock marked as Destroyed */ +/* 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 void lck_mtx_lock_spin(lck_mtx_t *lck); +extern uint64_t 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_interlock_spin(lck_mtx_t *lck); +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; @@ -104,8 +135,10 @@ 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; - lck_mtx_stat_t lck_mtx_stat; + uint64_t lck_mtx_stat; + unsigned int lck_mtx_pad2[2]; } lck_mtx_ext_t; #define LCK_MTX_ATTR_DEBUG 0x1 @@ -113,28 +146,82 @@ typedef struct _lck_mtx_ext_ { #define LCK_MTX_ATTR_STAT 0x2 #define LCK_MTX_ATTR_STATb 1 +#define LCK_MTX_EVENT(lck) ((event_t)(((unsigned int*)(lck))+(sizeof(lck_mtx_t)-1)/sizeof(unsigned int))) +#define LCK_EVENT_TO_MUTEX(event) ((lck_mtx_t *)(uintptr_t)(((unsigned int *)(event)) - ((sizeof(lck_mtx_t)-1)/sizeof(unsigned int)))) + +#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 int opaque[3]; + 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_t__ lck_mtx_t; +typedef struct __lck_mtx_ext_t__ lck_mtx_ext_t; +#endif #endif #endif #ifdef MACH_KERNEL_PRIVATE -typedef struct { - hw_lock_data_t interlock; - volatile unsigned int - read_count:16, /* No. of accepted readers */ - want_upgrade:1, /* Read-to-write upgrade waiting */ - want_write:1, /* Writer waiting or locked for write */ - waiting:1, /* Someone is sleeping on lock */ - can_sleep:1, /* Can attempts to lock go to sleep? */ - read_priority:1;/* New read takes piority over write */ - unsigned int lck_rw_tag; +#pragma pack(1) /* Make sure the structure stays as we defined it */ +typedef union _lck_rw_t_internal_ { + struct { + 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 */ + thread_t lck_rw_owner; /* Unused */ + }; + struct { + uint32_t data; /* Single word for count, ilk, and bitfields */ + uint32_t lck_rw_pad4; + uint32_t lck_rw_pad8; + uint32_t lck_rw_pad12; + }; } lck_rw_t; +#pragma pack() + +#define LCK_RW_SHARED_SHIFT 0 +#define LCK_RW_INTERLOCK_BIT 16 +#define LCK_RW_PRIV_EXCL_BIT 24 +#define LCK_RW_WANT_UPGRADE_BIT 25 +#define LCK_RW_WANT_EXCL_BIT 26 +#define LCK_RW_R_WAITING_BIT 27 +#define LCK_RW_W_WAITING_BIT 28 +#define LCK_RW_CAN_SLEEP_BIT 29 + +#define LCK_RW_INTERLOCK (1 << LCK_RW_INTERLOCK_BIT) +#define LCK_RW_WANT_UPGRADE (1 << LCK_RW_WANT_UPGRADE_BIT) +#define LCK_RW_WANT_EXCL (1 << LCK_RW_WANT_EXCL_BIT) +#define LCK_RW_R_WAITING (1 << LCK_RW_R_WAITING_BIT) +#define LCK_RW_W_WAITING (1 << LCK_RW_W_WAITING_BIT) +#define LCK_RW_PRIV_EXCL (1 << LCK_RW_PRIV_EXCL_BIT) +#define LCK_RW_TAG_VALID (1 << LCK_RW_TAG_VALID_BIT) +#define LCK_RW_SHARED_MASK (0xffff << LCK_RW_SHARED_SHIFT) +#define LCK_RW_SHARED_READER (1 << LCK_RW_SHARED_SHIFT) + +#define LCK_RW_WANT_WRITE LCK_RW_WANT_EXCL + #define LCK_RW_ATTR_DEBUG 0x1 #define LCK_RW_ATTR_DEBUGb 0 @@ -149,14 +236,43 @@ typedef struct { #define LCK_RW_TAG_DESTROYED 0x00002007 /* lock marked as Destroyed */ +#define RW_LOCK_READER_EVENT(x) ((event_t) (((unsigned char*) (x)) + (offsetof(lck_rw_t, lck_rw_tag)))) +#define RW_LOCK_WRITER_EVENT(x) ((event_t) (((unsigned char*) (x)) + (offsetof(lck_rw_t, lck_rw_pad8)))) +#define READ_EVENT_TO_RWLOCK(x) ((lck_rw_t *)(((unsigned char*)(x) - (offsetof(lck_rw_t, lck_rw_tag))))) +#define WRITE_EVENT_TO_RWLOCK(x) ((lck_rw_t *)(((unsigned char*)(x) - (offsetof(lck_rw_t, lck_rw_pad8))))) + +#if LOCK_PRIVATE + +#define disable_preemption_for_thread(t) ((cpu_data_t GS_RELATIVE *)0UL)->cpu_preemption_level++ + +#define LCK_MTX_THREAD_TO_STATE(t) ((uintptr_t)t) +#define PLATFORM_LCK_ILOCK 0 + +#define LOCK_SNOOP_SPINS 1000 +#define LOCK_PRETEST 1 + +/* Spinlock panic deadline, in mach_absolute_time units (ns on i386) */ +#define LOCK_PANIC_TIMEOUT 0xf00000 /* 250 ms (huge) */ + +#endif // LOCK_PRIVATE + #else #ifdef KERNEL_PRIVATE +#pragma pack(1) typedef struct { - unsigned int opaque[3]; + 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_ */