minix/include/sys/ras.h

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2012-08-10 18:05:05 +02:00
/* $NetBSD: ras.h,v 1.14 2008/08/11 21:51:14 skrll Exp $ */
/*-
* Copyright (c) 2002, 2004, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gregory McGarry.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifndef _SYS_RAS_H_
#define _SYS_RAS_H_
#ifndef __ASSEMBLER__
#include <sys/types.h>
#include <sys/queue.h>
struct ras {
struct ras *ras_next;
void *ras_startaddr;
void *ras_endaddr;
};
#define RAS_INSTALL 0
#define RAS_PURGE 1
#define RAS_PURGE_ALL 2
#else
#include <sys/cdefs.h>
#endif /* __ASSEMBLER__ */
#ifdef _KERNEL
#ifndef __ASSEMBLER__
struct proc;
void *ras_lookup(struct proc *, void *);
int ras_fork(struct proc *, struct proc *);
int ras_purgeall(void);
#endif /* __ASSEMBLER__ */
#else /* !_KERNEL */
#ifndef RAS_DECL
#define RAS_DECL(name) \
extern void __CONCAT(name,_ras_start(void)), __CONCAT(name,_ras_end(void))
#endif /* RAS_DECL */
/*
* RAS_START and RAS_END contain implicit instruction reordering
* barriers. See __insn_barrier() in <sys/cdefs.h>.
*
* Note: You are strongly advised to avoid coding RASs in C. There is a
* good chance the compiler will generate code which cannot be restarted.
*/
#define RAS_START(name) \
__asm volatile(".globl " ___STRING(name) "_ras_start\n" \
___STRING(name) "_ras_start:" \
::: "memory")
#define RAS_END(name) \
__asm volatile(".globl " ___STRING(name) "_ras_end\n" \
___STRING(name) "_ras_end:" \
::: "memory")
#define RAS_ADDR(name) ((void *)(uintptr_t) __CONCAT(name,_ras_start))
#define RAS_SIZE(name) ((size_t)((uintptr_t) __CONCAT(name,_ras_end) - \
(uintptr_t) __CONCAT(name,_ras_start)))
#ifndef __ASSEMBLER__
__BEGIN_DECLS
int rasctl(void *, size_t, int);
__END_DECLS
#else /* __ASSEMBLER__ */
#ifndef _ASM_LS_CHAR
#define _ASM_LS_CHAR ;
#endif
/*
* RAS_START_ASM and RAS_END_ASM are for use within assembly code.
* This is the prefered method of coding a RAS.
*/
#define RAS_START_ASM(name) \
.globl _C_LABEL(__CONCAT(name,_ras_start)) _ASM_LS_CHAR \
_C_LABEL(__CONCAT(name,_ras_start)):
#define RAS_END_ASM(name) \
.globl _C_LABEL(__CONCAT(name,_ras_end)) _ASM_LS_CHAR \
_C_LABEL(__CONCAT(name,_ras_end)):
/*
* RAS_START_ASM_HIDDEN and RAS_END_ASM_HIDDEN are similar to the above,
* except that they limit the scope of the symbol such that it will not
* be placed into the dynamic symbol table. Thus no other module (executable
* or shared library) can reference it directly.
*/
#define RAS_START_ASM_HIDDEN(name) \
.globl _C_LABEL(__CONCAT(name,_ras_start)) _ASM_LS_CHAR \
.hidden _C_LABEL(__CONCAT(name,_ras_start)) _ASM_LS_CHAR \
_C_LABEL(__CONCAT(name,_ras_start)):
#define RAS_END_ASM_HIDDEN(name) \
.globl _C_LABEL(__CONCAT(name,_ras_end)) _ASM_LS_CHAR \
.hidden _C_LABEL(__CONCAT(name,_ras_end)) _ASM_LS_CHAR \
_C_LABEL(__CONCAT(name,_ras_end)):
#endif /* __ASSEMBLER__ */
#endif /* _KERNEL */
#endif /* !_SYS_RAS_H_ */