139923942SSimon Schubert /*
246d4e165SJordan Gordeev * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
346d4e165SJordan Gordeev *
446d4e165SJordan Gordeev * This code is derived from software contributed to The DragonFly Project
546d4e165SJordan Gordeev * by Matthew Dillon <dillon@backplane.com>
639923942SSimon Schubert *
739923942SSimon Schubert * Redistribution and use in source and binary forms, with or without
839923942SSimon Schubert * modification, are permitted provided that the following conditions
939923942SSimon Schubert * are met:
1046d4e165SJordan Gordeev *
1139923942SSimon Schubert * 1. Redistributions of source code must retain the above copyright
1239923942SSimon Schubert * notice, this list of conditions and the following disclaimer.
1346d4e165SJordan Gordeev * 2. Redistributions in binary form must reproduce the above copyright
1446d4e165SJordan Gordeev * notice, this list of conditions and the following disclaimer in
1546d4e165SJordan Gordeev * the documentation and/or other materials provided with the
1646d4e165SJordan Gordeev * distribution.
1746d4e165SJordan Gordeev * 3. Neither the name of The DragonFly Project nor the names of its
1846d4e165SJordan Gordeev * contributors may be used to endorse or promote products derived
1946d4e165SJordan Gordeev * from this software without specific, prior written permission.
2039923942SSimon Schubert *
2146d4e165SJordan Gordeev * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
2246d4e165SJordan Gordeev * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
2346d4e165SJordan Gordeev * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
2446d4e165SJordan Gordeev * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
2546d4e165SJordan Gordeev * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
2646d4e165SJordan Gordeev * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
2746d4e165SJordan Gordeev * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
2846d4e165SJordan Gordeev * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
2946d4e165SJordan Gordeev * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
3046d4e165SJordan Gordeev * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
3146d4e165SJordan Gordeev * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3239923942SSimon Schubert * SUCH DAMAGE.
3339923942SSimon Schubert *
3439923942SSimon Schubert * $FreeBSD: src/sys/i386/include/lock.h,v 1.11.2.2 2000/09/30 02:49:34 ps Exp $
3539923942SSimon Schubert */
3639923942SSimon Schubert
3739923942SSimon Schubert #ifndef _MACHINE_LOCK_H_
3839923942SSimon Schubert #define _MACHINE_LOCK_H_
3939923942SSimon Schubert
40d7f50089SYonghong Yan #ifndef _CPU_PSL_H_
41d7f50089SYonghong Yan #include <machine/psl.h>
4239923942SSimon Schubert #endif
4339923942SSimon Schubert
4439923942SSimon Schubert #ifdef LOCORE
4539923942SSimon Schubert
4639923942SSimon Schubert /*
47c8fe38aeSMatthew Dillon * Spinlock assembly support. Note: rax and rcx can be tromped. No
4839923942SSimon Schubert * other register will be. Note that these routines are sometimes
4939923942SSimon Schubert * called with (%edx) as the mem argument.
5039923942SSimon Schubert *
5139923942SSimon Schubert * Under UP the spinlock routines still serve to disable/restore
5239923942SSimon Schubert * interrupts.
5339923942SSimon Schubert */
5439923942SSimon Schubert
5539923942SSimon Schubert #define SPIN_INIT(mem) \
56c8fe38aeSMatthew Dillon movq $0,mem ; \
5739923942SSimon Schubert
5839923942SSimon Schubert #define SPIN_INIT_NOREG(mem) \
5939923942SSimon Schubert SPIN_INIT(mem) ; \
6039923942SSimon Schubert
6139923942SSimon Schubert #define SPIN_LOCK(mem) \
62c8fe38aeSMatthew Dillon pushfq ; \
63c8fe38aeSMatthew Dillon popq %rcx ; /* flags */ \
6439923942SSimon Schubert cli ; \
6546d4e165SJordan Gordeev orq $PSL_C,%rcx ; /* make sure non-zero */ \
66*e3e00568SMatthew Dillon 906: ; \
67*e3e00568SMatthew Dillon movq mem, %rax ; \
68*e3e00568SMatthew Dillon 907: ; \
69*e3e00568SMatthew Dillon cmpq $0,%rax ; \
70*e3e00568SMatthew Dillon jnz 908f ; \
71c8fe38aeSMatthew Dillon lock cmpxchgq %rcx,mem ; /* Z=1 (jz) on success */ \
72*e3e00568SMatthew Dillon jz 909f ; \
7346d4e165SJordan Gordeev pause ; \
74*e3e00568SMatthew Dillon jmp 907b ; \
75*e3e00568SMatthew Dillon 908: ; \
76*e3e00568SMatthew Dillon pause ; \
77*e3e00568SMatthew Dillon jmp 906b ; \
78*e3e00568SMatthew Dillon 909: ; \
7939923942SSimon Schubert
8039923942SSimon Schubert #define SPIN_LOCK_PUSH_REGS \
8146d4e165SJordan Gordeev subq $16,%rsp ; \
82c8fe38aeSMatthew Dillon movq %rcx,(%rsp) ; \
83c8fe38aeSMatthew Dillon movq %rax,8(%rsp) ; \
8439923942SSimon Schubert
8539923942SSimon Schubert #define SPIN_LOCK_POP_REGS \
86c8fe38aeSMatthew Dillon movq (%rsp),%rcx ; \
87c8fe38aeSMatthew Dillon movq 8(%rsp),%rax ; \
8846d4e165SJordan Gordeev addq $16,%rsp ; \
8939923942SSimon Schubert
9046d4e165SJordan Gordeev #define SPIN_LOCK_FRAME_SIZE 16
9139923942SSimon Schubert
9239923942SSimon Schubert #define SPIN_LOCK_NOREG(mem) \
9339923942SSimon Schubert SPIN_LOCK_PUSH_REGS ; \
9439923942SSimon Schubert SPIN_LOCK(mem) ; \
9539923942SSimon Schubert SPIN_LOCK_POP_REGS ; \
9639923942SSimon Schubert
9739923942SSimon Schubert #define SPIN_UNLOCK(mem) \
98c8fe38aeSMatthew Dillon pushq mem ; \
99c8fe38aeSMatthew Dillon movq $0,mem ; \
100c8fe38aeSMatthew Dillon popfq ; \
10139923942SSimon Schubert
10239923942SSimon Schubert #define SPIN_UNLOCK_PUSH_REGS
10339923942SSimon Schubert #define SPIN_UNLOCK_POP_REGS
10439923942SSimon Schubert #define SPIN_UNLOCK_FRAME_SIZE 0
10539923942SSimon Schubert
10639923942SSimon Schubert #define SPIN_UNLOCK_NOREG(mem) \
10739923942SSimon Schubert SPIN_UNLOCK(mem) ; \
10839923942SSimon Schubert
10939923942SSimon Schubert #else /* !LOCORE */
11039923942SSimon Schubert
11139923942SSimon Schubert #ifdef _KERNEL
11239923942SSimon Schubert
11339923942SSimon Schubert /*
11439923942SSimon Schubert * Spinlock functions (UP and SMP). Under UP a spinlock still serves
11539923942SSimon Schubert * to disable/restore interrupts even if it doesn't spin.
11639923942SSimon Schubert */
11739923942SSimon Schubert struct spinlock_deprecated {
118c8fe38aeSMatthew Dillon volatile long opaque;
11939923942SSimon Schubert };
12039923942SSimon Schubert
12139923942SSimon Schubert void com_lock(void); /* disables int / spinlock combo */
12239923942SSimon Schubert void com_unlock(void);
12339923942SSimon Schubert void imen_lock(void); /* disables int / spinlock combo */
12439923942SSimon Schubert void imen_unlock(void);
12539923942SSimon Schubert void clock_lock(void); /* disables int / spinlock combo */
12639923942SSimon Schubert void clock_unlock(void);
12739923942SSimon Schubert
1285b8eedf1SSascha Wildner void spin_lock_deprecated(struct spinlock_deprecated *lock);
1295b8eedf1SSascha Wildner void spin_unlock_deprecated(struct spinlock_deprecated *lock);
13039923942SSimon Schubert
13139923942SSimon Schubert /*
13239923942SSimon Schubert * Inline version of spinlock routines -- overrides assembly. Only unlock
13339923942SSimon Schubert * and init here please.
13439923942SSimon Schubert */
13539923942SSimon Schubert static __inline void
spin_init_deprecated(struct spinlock_deprecated * lock)1365b8eedf1SSascha Wildner spin_init_deprecated(struct spinlock_deprecated *lock)
13739923942SSimon Schubert {
13839923942SSimon Schubert lock->opaque = 0;
13939923942SSimon Schubert }
14039923942SSimon Schubert
14139923942SSimon Schubert #endif /* _KERNEL */
14239923942SSimon Schubert
14339923942SSimon Schubert #endif /* LOCORE */
14439923942SSimon Schubert #endif /* !_MACHINE_LOCK_H_ */
145