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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#if defined(lint) || defined(DS_DDICT)
#include <sys/types.h>
#include <sys/param.h>
#else
#include "assym.h" /* Determine value of CPU_THREAD */
#include <sys/asm_linkage.h>
#endif
#ifdef DS_DDICT
#define uint8_t uchar_t
#endif
/*
* Special support routines that can't be done with C
* x86 variant
*/
/*
* uint8_t nsc_ldstub(uint8_t *cp)
*
* Store 0xFF at the specified location, and return its previous content.
*/
#if defined(lint) || defined(DS_DDICT)
uint8_t
nsc_ldstub(uint8_t *cp)
{
uint8_t rv;
rv = *cp;
*cp = 0xFF;
return (rv);
}
#else
ENTRY(nsc_ldstub)
#if defined(__amd64)
movl $0xff,%eax
lock
xchgb %al, (%rdi) /* rdi = lock addr */
ret
#elif defined(__i386)
movl 4(%esp), %ecx /* ecx = lock addr */
movl $0xff, %eax /* eax = 0xff */
lock
xchgb %al, (%ecx) /* atomic swap eax <-> *ecx */
ret
#else
#error "port this routine"
#endif
SET_SIZE(nsc_ldstub)
#endif
/*
* nsc_membar_stld(void)
*
* On SPARC this is a C callable interface to SPARC asm membar instruction.
* For x86 we brute force it with a #LOCK instruction.
*/
#if defined(lint) || defined(DS_DDICT)
void
nsc_membar_stld(void)
{}
#else
ENTRY(nsc_membar_stld)
#if defined(__amd64)
mfence
ret
#elif defined(__i386)
lock
xorl $0, (%esp)
ret
#else
#error "port this routine"
#endif
SET_SIZE(nsc_membar_stld)
#endif /* lint || DS_DDICT */
/*
* if a() calls b() calls nsc_caller(),
* nsc_caller() returns return address in a().
*/
#if defined(lint) || defined(DS_DDICT)
caddr_t
nsc_caller(void)
{
return (0);
}
#else
ENTRY(nsc_caller)
#if defined(__amd64)
movq 8(%rbp), %rax /* b()'s return pc, in a() */
ret
#elif defined(__i386)
movl 4(%ebp), %eax /* b()'s return pc, in a() */
ret
#else
#error "port this routine"
#endif
SET_SIZE(nsc_caller)
#endif /* lint || DS_DDICT */
/*
* if a() calls nsc_callee(), nsc_callee() returns the
* return address in a();
*/
#if defined(lint) || defined(DS_DDICT)
caddr_t
nsc_callee(void)
{
return (0);
}
#else
ENTRY(nsc_callee)
#if defined(__amd64)
movq (%rsp), %rax /* callee()'s return pc, in a() */
ret
#elif defined(__i386)
movl (%esp), %eax /* callee()'s return pc, in a() */
ret
#else
#error "port this routine"
#endif
SET_SIZE(nsc_callee)
#endif /* lint || DS_DDICT */
/*
* nsc_threadp(void)
*
* C callable interface to get the current thread pointer.
*/
#if defined(lint) || defined(DS_DDICT)
void *
nsc_threadp(void)
{
return (NULL);
}
#else
ENTRY(nsc_threadp)
#if defined(__amd64)
movq %gs:CPU_THREAD, %rax
ret
#elif defined(__i386)
movl %gs:CPU_THREAD,%eax
ret
#else
#error "port this routine"
#endif
SET_SIZE(nsc_threadp)
#endif /* lint || DS_DDICT */
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