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[apple/xnu.git] / osfmk / i386 / locks.h
diff --git a/osfmk/i386/locks.h b/osfmk/i386/locks.h
index 368b34141a95b7f82ed8a9a2fe0d73c01a3ccc63..736f7a4df004b2bbaf350b4b14b6666da03e68c1 100644 (file)
--- a/osfmk/i386/locks.h
+++ b/osfmk/i386/locks.h
@@ -2,7 +2,7 @@
  * Copyright (c) 2004-2012 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 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
  * 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
@@ -11,10 +11,10 @@
  * 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.
  * 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.
  * 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,
  * 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,
@@ -22,208 +22,280 @@
  * 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.
  * 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@
  */
 
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
-#ifndef        _I386_LOCKS_H_
-#define        _I386_LOCKS_H_
+#ifndef _I386_LOCKS_H_
+#define _I386_LOCKS_H_
 
 #include <sys/appleapiopts.h>
 #include <kern/kern_types.h>
 
 #include <sys/appleapiopts.h>
 #include <kern/kern_types.h>
+#include <kern/assert.h>
 
 
-#ifdef MACH_KERNEL_PRIVATE
+#ifdef  MACH_KERNEL_PRIVATE
 
 #include <i386/hw_lock_types.h>
 
 
 #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 */
+#define enaLkDeb                0x00000001      /* Request debug in default attribute */
+#define enaLkStat               0x00000002      /* Request statistic in default attribute */
+#define disLkRWPrio             0x00000004      /* Disable RW lock priority promotion */
+#define enaLkTimeStat           0x00000008      /* Request time statistics in default attribute */
 
 #endif /* MACH_KERNEL_PRIVATE */
 
 
 #endif /* MACH_KERNEL_PRIVATE */
 
-#if    defined(MACH_KERNEL_PRIVATE)
+#if     defined(MACH_KERNEL_PRIVATE)
 typedef struct {
 typedef struct {
-       volatile uintptr_t      interlock;
-#if    MACH_LDEBUG
-       unsigned long   lck_spin_pad[9];        /* 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;
 
 #endif
 } lck_spin_t;
 
-#define        LCK_SPIN_TAG_DESTROYED          0x00002007      /* lock marked as Destroyed */
+#define LCK_SPIN_TAG_DESTROYED          0x00002007      /* lock marked as Destroyed */
 
 #else /* MACH_KERNEL_PRIVATE */
 
 #else /* MACH_KERNEL_PRIVATE */
-#ifdef KERNEL_PRIVATE
+#ifdef  KERNEL_PRIVATE
 typedef struct {
        unsigned long    opaque[10];
 } lck_spin_t;
 #else /* KERNEL_PRIVATE */
 typedef struct {
        unsigned long    opaque[10];
 } lck_spin_t;
 #else /* KERNEL_PRIVATE */
-typedef        struct __lck_spin_t__   lck_spin_t;
+typedef struct __lck_spin_t__   lck_spin_t;
 #endif
 #endif
 
 #endif
 #endif
 
-#ifdef MACH_KERNEL_PRIVATE
+#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 {
 /* 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;
+                       volatile uintptr_t              lck_mtx_owner;
                        union {
                                struct {
                                        volatile uint32_t
                        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;
+                                           lck_mtx_waiters:16,
+                                           lck_mtx_pri:8, // unused
+                                           lck_mtx_ilocked:1,
+                                           lck_mtx_mlocked:1,
+                                           lck_mtx_promoted:1, // unused
+                                           lck_mtx_spin:1,
+                                           lck_mtx_is_ext:1,
+                                           lck_mtx_pad3:3;
                                };
                                };
-                                       uint32_t        lck_mtxd_state;
+                               uint32_t        lck_mtx_state;
                        };
                        /* Pad field used as a canary, initialized to ~0 */
                        };
                        /* Pad field used as a canary, initialized to ~0 */
-                       uint32_t                        lck_mtxd_pad32;
-               } lck_mtxd;
+                       uint32_t                        lck_mtx_pad32;
+               };
                struct {
                struct {
-                       struct _lck_mtx_ext_            *lck_mtxi_ptr;
-                       uint32_t                        lck_mtxi_tag;
-                       uint32_t                        lck_mtxi_pad32;
-               } 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;
 
 } 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_WAITERS_MSK             0x0000ffff
+#define LCK_MTX_WAITER                  0x00000001
+#define LCK_MTX_PRIORITY_MSK            0x00ff0000
+#define LCK_MTX_ILOCKED_MSK             0x01000000
+#define LCK_MTX_MLOCKED_MSK             0x02000000
+#define LCK_MTX_SPIN_MSK                0x08000000
 
 
-#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 */
 /* 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 */
+#define LCK_MTX_TAG_INDIRECT                    0x07ff1007      /* lock marked as Indirect  */
+#define LCK_MTX_TAG_DESTROYED                   0x07fe2007      /* lock marked as Destroyed */
 
 /* Adaptive spin before blocking */
 
 /* 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 uint64_t         MutexSpin;
+extern uint64_t         low_MutexSpin;
+extern int64_t         high_MutexSpin;
+
+typedef enum lck_mtx_spinwait_ret_type {
+       LCK_MTX_SPINWAIT_ACQUIRED = 0,
+
+       LCK_MTX_SPINWAIT_SPUN_HIGH_THR = 1,
+       LCK_MTX_SPINWAIT_SPUN_OWNER_NOT_CORE = 2,
+       LCK_MTX_SPINWAIT_SPUN_NO_WINDOW_CONTENTION = 3,
+       LCK_MTX_SPINWAIT_SPUN_SLIDING_THR = 4,
 
 
-extern void            lck_mtx_lock_mark_destroyed(lck_mtx_t *mutex);
-extern int             lck_mtx_lock_grab_mutex(lck_mtx_t *mutex);
+       LCK_MTX_SPINWAIT_NO_SPIN = 5,
+} lck_mtx_spinwait_ret_type_t;
 
 
-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);
+extern lck_mtx_spinwait_ret_type_t              lck_mtx_lock_spinwait_x86(lck_mtx_t *mutex);
+struct turnstile;
+extern void                                     lck_mtx_lock_wait_x86(lck_mtx_t *mutex, struct turnstile **ts);
+extern void                                     lck_mtx_lock_acquire_x86(lck_mtx_t *mutex);
+
+extern void                                     lck_mtx_lock_slow(lck_mtx_t *lock);
+extern boolean_t                                lck_mtx_try_lock_slow(lck_mtx_t *lock);
+extern void                                     lck_mtx_unlock_slow(lck_mtx_t *lock);
+extern void                                     lck_mtx_lock_spin_slow(lck_mtx_t *lock);
+extern boolean_t                                lck_mtx_try_lock_spin_slow(lck_mtx_t *lock);
+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 {
 
 typedef struct {
-       unsigned int            type;
-       unsigned int            pad4;
-       vm_offset_t             pc;
-       vm_offset_t             thread;
+       unsigned int            type;
+       unsigned int            pad4;
+       vm_offset_t             pc;
+       vm_offset_t             thread;
 } lck_mtx_deb_t;
 
 #define MUTEX_TAG       0x4d4d
 
 typedef struct {
 } lck_mtx_deb_t;
 
 #define MUTEX_TAG       0x4d4d
 
 typedef struct {
-       unsigned int            lck_mtx_stat_data;
+       unsigned int            lck_mtx_stat_data;
 } lck_mtx_stat_t;
 
 typedef struct _lck_mtx_ext_ {
 } 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_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;
 
 } 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
+#define LCK_MTX_ATTR_DEBUG      0x1
+#define LCK_MTX_ATTR_DEBUGb     0
+#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 */
 
 #else /* MACH_KERNEL_PRIVATE */
-#ifdef XNU_KERNEL_PRIVATE
+#ifdef  XNU_KERNEL_PRIVATE
 typedef struct {
 typedef struct {
-       unsigned long           opaque[2];
+       unsigned long           opaque[2];
 } lck_mtx_t;
 
 typedef struct {
 } lck_mtx_t;
 
 typedef struct {
-       unsigned long           opaque[10];
+       unsigned long           opaque[10];
 } lck_mtx_ext_t;
 #else
 } lck_mtx_ext_t;
 #else
-#ifdef KERNEL_PRIVATE
+#ifdef  KERNEL_PRIVATE
 typedef struct {
 typedef struct {
-       unsigned long           opaque[2];
+       unsigned long           opaque[2];
 } lck_mtx_t;
 
 typedef struct {
 } lck_mtx_t;
 
 typedef struct {
-       unsigned long           opaque[10];
+       unsigned long           opaque[10];
 } lck_mtx_ext_t;
 
 #else
 } lck_mtx_ext_t;
 
 #else
-typedef struct __lck_mtx_t__           lck_mtx_t;
-typedef struct __lck_mtx_ext_t__       lck_mtx_ext_t;
+typedef struct __lck_mtx_t__            lck_mtx_t;
+typedef struct __lck_mtx_ext_t__        lck_mtx_ext_t;
 #endif
 #endif
 #endif
 
 #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;
+#ifdef  MACH_KERNEL_PRIVATE
+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;
 } lck_rw_t;
-#pragma pack()
+#define LCK_RW_T_SIZE           16
+
+static_assert(sizeof(lck_rw_t) == LCK_RW_T_SIZE);
+
+#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_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_WANT_WRITE       LCK_RW_WANT_EXCL
 
 
-#define        LCK_RW_TAG_DESTROYED            0x00002007      /* lock marked as Destroyed */
+
+#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 */
+
+#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)   disable_preemption_internal()
+#define preemption_disabled_for_thread(t)  (get_preemption_level() > 0)
+
+#define LCK_MTX_THREAD_TO_STATE(t)      ((uintptr_t)t)
+#define PLATFORM_LCK_ILOCK              0
+
+#define LOCK_SNOOP_SPINS        1000
+#define LOCK_PRETEST            1
+
+/* hw_lock_lock static panic deadline, in timebase units. hw_lock_to() uses
+ * LockTimeoutTSC computed at startup
+ */
+#define LOCK_PANIC_TIMEOUT      0xf000000  /* 251e6 TSC ticks */
+
+#endif  // LOCK_PRIVATE
 
 #else
 
 #else
-#ifdef KERNEL_PRIVATE
+#ifdef  KERNEL_PRIVATE
 #pragma pack(1)
 typedef struct {
 #pragma pack(1)
 typedef struct {
-       uint32_t                opaque[3];
-       uint32_t                opaque4;
+       uint32_t                opaque[3];
+       uint32_t                opaque4;
 } lck_rw_t;
 #pragma pack()
 #else
 } lck_rw_t;
 #pragma pack()
 #else
-typedef struct __lck_rw_t__    lck_rw_t;
+typedef struct __lck_rw_t__     lck_rw_t;
 #endif
 #endif
 
 #endif
 #endif
 
-#endif /* _I386_LOCKS_H_ */
+#ifdef MACH_KERNEL_PRIVATE
+
+extern void             kernel_preempt_check(void);
+
+#endif /* MACH_KERNEL_PRIVATE */
+#endif  /* _I386_LOCKS_H_ */
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