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/*********************************************************
* Copyright (C) 2007 VMware, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of VMware Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission of VMware Inc.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*********************************************************/
/*
* os.h --
*
* FreeBSD-specific definitions.
*/
#ifndef __OS_H__
#define __OS_H__
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/proc.h>
#include <sys/condvar.h>
#include <vm/uma.h>
#include <machine/stdarg.h>
#include "vm_basic_types.h"
typedef struct sx os_rwlock_t;
typedef struct uma_zone os_kmem_cache_t;
typedef struct os_completion_t {
Bool completed;
struct mtx mutex;
struct cv cv;
} os_completion_t;
/*
* Changing the os_atomic_t type requires that the os_atomic_* macros below be
* changed as well.
*/
typedef unsigned int os_atomic_t;
typedef struct file * os_blocker_id_t;
#define OS_UNKNOWN_BLOCKER NULL
#define OS_ENOMEM ENOMEM
#define OS_ENOENT ENOENT
#define OS_EEXIST EEXIST
#define OS_PATH_MAX MAXPATHLEN
#define OS_KMEM_CACHE_FLAG_HWALIGN 0 // unused
#define OS_FMTTID "p"
#define os_threadid curthread
extern NORETURN void os_panic(const char *fmt, va_list args);
#define os_rwlock_init(lock) sx_init(lock, "vmblock-sx")
#define os_rwlock_destroy(lock) sx_destroy(lock)
#define os_assert_rwlock_held(lock) sx_assert(lock, SX_LOCKED)
#define os_read_lock(lock) sx_slock(lock)
#define os_write_lock(lock) sx_xlock(lock)
#define os_read_unlock(lock) sx_sunlock(lock)
#define os_write_unlock(lock) sx_xunlock(lock)
/*
* XXX linux/os.h requests alignment on HW cache lines. Is this of
* serious concern? We can do that by using UMA_ALIGN_CACHE as the
* 'align' parameter to uma_zalloc, but with slightly different
* semantics, it sort of changes the name of the game.
*/
#define os_kmem_cache_create(name, size, align, ctor) \
uma_zcreate(name, size, ctor, NULL, NULL, NULL, align, 0)
#define os_kmem_cache_destroy(cache) uma_zdestroy(cache)
#define os_kmem_cache_alloc(cache) uma_zalloc(cache, M_WAITOK)
#define os_kmem_cache_free(cache, elem) uma_zfree(cache, elem)
#define os_completion_init(comp) \
do { \
(comp)->completed = FALSE; \
mtx_init(&(comp)->mutex, "vmblock-mtx", "vmblock-mtx", MTX_DEF); \
cv_init(&(comp)->cv, "vmblock-cv"); \
} while (0)
#define os_completion_destroy(comp) \
do { \
mtx_destroy(&(comp)->mutex); \
cv_destroy(&(comp)->cv); \
} while (0)
/*
* This macro evaluates to non-zero only if cv_wait_sig is interrupted.
*/
#define os_wait_for_completion(comp) \
({ \
int error = 0; \
mtx_lock(&(comp)->mutex); \
while (!(comp)->completed && !error) { \
error = cv_wait_sig(&(comp)->cv, &(comp)->mutex); \
} \
mtx_unlock(&(comp)->mutex); \
error; \
})
#define os_complete_all(comp) \
do { \
mtx_lock(&(comp)->mutex); \
(comp)->completed = TRUE; \
cv_broadcast(&(comp)->cv); \
mtx_unlock(&(comp)->mutex); \
} while (0)
/* atomic_fetchadd_int returns the value of atomic before addition. */
#define os_atomic_dec_and_test(atomic) (atomic_fetchadd_int(atomic, -1) == 1)
#define os_atomic_dec(atomic) atomic_subtract_int(atomic, 1)
#define os_atomic_inc(atomic) atomic_add_int(atomic, 1)
#define os_atomic_set(atomic, val) atomic_store_rel_int(atomic, val)
#define os_atomic_read(atomic) atomic_load_acq_int(atomic)
#endif /* __OS_H__ */
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