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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2014 Pluribus Networks Inc.
* Copyright 2017 Joyent, Inc.
*/
#ifndef _COMPAT_FREEBSD_AMD64_MACHINE_ATOMIC_H_
#define _COMPAT_FREEBSD_AMD64_MACHINE_ATOMIC_H_
static __inline u_char
atomic_load_acq_char(volatile u_char *p)
{
u_char res;
__asm volatile("lock ; " "cmpxchgb %b0,%1"
: "=a" (res), "=m" (*p)
: "m" (*p) : "memory", "cc");
return (res);
}
static __inline u_short
atomic_load_acq_short(volatile u_short *p)
{
u_short res;
__asm volatile("lock ; " "cmpxchgw %w0,%1"
: "=a" (res), "=m" (*p)
: "m" (*p)
: "memory", "cc");
return (res);
}
static __inline u_int
atomic_load_acq_int(volatile u_int *p)
{
u_int res;
__asm volatile("lock ; " "cmpxchgl %0,%1"
: "=a" (res), "=m" (*p)
: "m" (*p)
: "memory", "cc");
return (res);
}
static __inline u_long
atomic_load_acq_long(volatile u_long *p)
{
u_long res;
__asm volatile("lock ; " "cmpxchgq %0,%1"
: "=a" (res), "=m" (*p)
: "m" (*p)
: "memory", "cc");
return (res);
}
static __inline void
atomic_store_rel_char(volatile u_char *p, u_char v)
{
__asm volatile("" : : : "memory");
*p = v;
}
static __inline void
atomic_store_rel_short(volatile u_short *p, u_short v)
{
__asm volatile("" : : : "memory");
*p = v;
}
static __inline void
atomic_store_rel_int(volatile u_int *p, u_int v)
{
__asm volatile("" : : : "memory");
*p = v;
}
static __inline void
atomic_store_rel_long(volatile u_long *p, u_long v)
{
__asm volatile("" : : : "memory");
*p = v;
}
/*
* Atomic compare and set.
*
* if (*dst == expect) *dst = src (all 32 bit words)
*
* Returns 0 on failure, non-zero on success
*/
static __inline int
atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src)
{
u_char res;
__asm __volatile(
" lock ; "
" cmpxchgl %3,%1 ; "
" sete %0 ; "
"# atomic_cmpset_int"
: "=q" (res), /* 0 */
"+m" (*dst), /* 1 */
"+a" (expect) /* 2 */
: "r" (src) /* 3 */
: "memory", "cc");
return (res);
}
static __inline int
atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src)
{
u_char res;
__asm __volatile(
" lock ; "
" cmpxchgq %3,%1 ; "
" sete %0 ; "
"# atomic_cmpset_long"
: "=q" (res), /* 0 */
"+m" (*dst), /* 1 */
"+a" (expect) /* 2 */
: "r" (src) /* 3 */
: "memory", "cc");
return (res);
}
/*
* Atomically add the value of v to the integer pointed to by p and return
* the previous value of *p.
*/
static __inline u_int
atomic_fetchadd_int(volatile u_int *p, u_int v)
{
__asm __volatile(
" lock ; "
" xaddl %0, %1 ; "
"# atomic_fetchadd_int"
: "+r" (v), /* 0 (result) */
"=m" (*p) /* 1 */
: "m" (*p) /* 2 */
: "cc");
return (v);
}
static __inline void
atomic_set_int(volatile u_int *p, u_int v)
{
__asm volatile(
"lock ; " "orl %1,%0"
: "=m" (*p)
: "ir" (v), "m" (*p)
: "cc");
}
static __inline void
atomic_clear_int(volatile u_int *p, u_int v)
{
__asm volatile(
"lock ; " "andl %1,%0"
: "=m" (*p)
: "ir" (~v), "m" (*p)
: "cc");
}
static __inline void
atomic_subtract_int(volatile u_int *p, u_int v)
{
__asm volatile(
"lock ; " "subl %1,%0"
: "=m" (*p)
: "ir" (v), "m" (*p)
: "cc");
}
static __inline void
atomic_set_long(volatile u_long *p, u_long v)
{
__asm volatile(
"lock ; " "orq %1,%0"
: "+m" (*p)
: "ir" (v)
: "cc");
}
static __inline void
atomic_clear_long(volatile u_long *p, u_long v)
{
__asm volatile("lock ; " "andq %1,%0"
: "+m" (*p)
: "ir" (~v)
: "cc");
}
static __inline u_int
atomic_swap_int(volatile u_int *p, u_int v)
{
__asm __volatile(
" xchgl %1,%0 ; "
"# atomic_swap_int"
: "+r" (v), /* 0 */
"+m" (*p)); /* 1 */
return (v);
}
static __inline u_long
atomic_swap_long(volatile u_long *p, u_long v)
{
__asm __volatile(
" xchgq %1,%0 ; "
"# atomic_swap_long"
: "+r" (v), /* 0 */
"+m" (*p)); /* 1 */
return (v);
}
#define atomic_readandclear_int(p) atomic_swap_int(p, 0)
#define atomic_readandclear_long(p) atomic_swap_long(p, 0)
/* Operations on 32-bit double words. */
#define atomic_load_acq_32 atomic_load_acq_int
#define atomic_store_rel_32 atomic_store_rel_int
#define atomic_cmpset_32 atomic_cmpset_int
/* Operations on 64-bit quad words. */
#define atomic_cmpset_64 atomic_cmpset_long
#define atomic_readandclear_64 atomic_readandclear_long
/* Operations on pointers. */
#define atomic_cmpset_ptr atomic_cmpset_long
#define mb() __asm __volatile("mfence;" : : : "memory")
#endif /* _COMPAT_FREEBSD_AMD64_MACHINE_ATOMIC_H_ */
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