ras.h

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    1 /*      $NetBSD: ras.h,v 1.15 2021/01/11 21:51:20 skrll Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 2002, 2004, 2007 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Gregory McGarry.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _SYS_RAS_H_
   33 #define _SYS_RAS_H_
   34 
   35 #ifndef __ASSEMBLER__
   36 #include <sys/types.h>
   37 #include <sys/queue.h>
   38 
   39 struct ras {
   40         struct ras      *ras_next;
   41         void            *ras_startaddr;
   42         void            *ras_endaddr;
   43 };
   44 
   45 #define RAS_INSTALL             0
   46 #define RAS_PURGE               1
   47 #define RAS_PURGE_ALL           2
   48 #else
   49 #include <sys/cdefs.h>
   50 #endif /* __ASSEMBLER__ */
   51 
   52 #ifdef _KERNEL
   53 
   54 #ifndef __ASSEMBLER__
   55 struct proc;
   56 
   57 void    *ras_lookup(struct proc *, void *);
   58 int     ras_fork(struct proc *, struct proc *);
   59 int     ras_purgeall(void);
   60 #endif /* __ASSEMBLER__ */
   61 
   62 #else /* !_KERNEL */
   63 
   64 #ifndef RAS_DECL
   65 
   66 #define RAS_DECL(name)                                                  \
   67 extern void __CONCAT(name,_ras_start(void)), __CONCAT(name,_ras_end(void))
   68 
   69 #endif  /* RAS_DECL */
   70 
   71 /*
   72  * RAS_START and RAS_END contain implicit instruction reordering
   73  * barriers.  See __insn_barrier() in <sys/cdefs.h>.
   74  *
   75  * Note: You are strongly advised to avoid coding RASs in C. There is a
   76  * good chance the compiler will generate code which cannot be restarted.
   77  */
   78 #define RAS_START(name)                                                 \
   79         __asm volatile(".globl " ___STRING(name) "_ras_start\n" \
   80                          ___STRING(name) "_ras_start:"                  \
   81             ::: "memory")
   82 
   83 #define RAS_END(name)                                                   \
   84         __asm volatile(".globl " ___STRING(name) "_ras_end\n"           \
   85                          ___STRING(name) "_ras_end:"                    \
   86             ::: "memory")
   87 
   88 #define RAS_ADDR(name)  ((void *)(uintptr_t) __CONCAT(name,_ras_start))
   89 #define RAS_SIZE(name)  ((size_t)((uintptr_t) __CONCAT(name,_ras_end) - \
   90                                   (uintptr_t) __CONCAT(name,_ras_start)))
   91 
   92 #ifndef __ASSEMBLER__
   93 __BEGIN_DECLS
   94 int rasctl(void *, size_t, int);
   95 __END_DECLS
   96 
   97 #else /* __ASSEMBLER__ */
   98 
   99 #ifndef _ASM_LS_CHAR
  100 #define _ASM_LS_CHAR    ;
  101 #endif
  102 
  103 /*
  104  * RAS_START_ASM and RAS_END_ASM are for use within assembly code.
  105  * This is the preferred method of coding a RAS.
  106  */
  107 #define RAS_START_ASM(name)                                             \
  108         .globl _C_LABEL(__CONCAT(name,_ras_start))       _ASM_LS_CHAR   \
  109         _C_LABEL(__CONCAT(name,_ras_start)):
  110 
  111 #define RAS_END_ASM(name)                                               \
  112         .globl _C_LABEL(__CONCAT(name,_ras_end))        _ASM_LS_CHAR    \
  113         _C_LABEL(__CONCAT(name,_ras_end)):
  114 
  115 /*
  116  * RAS_START_ASM_HIDDEN and RAS_END_ASM_HIDDEN are similar to the above,
  117  * except that they limit the scope of the symbol such that it will not
  118  * be placed into the dynamic symbol table. Thus no other module (executable
  119  * or shared library) can reference it directly.
  120  */
  121 #define RAS_START_ASM_HIDDEN(name)                                      \
  122         .globl _C_LABEL(__CONCAT(name,_ras_start))      _ASM_LS_CHAR    \
  123         .hidden _C_LABEL(__CONCAT(name,_ras_start))     _ASM_LS_CHAR    \
  124         _C_LABEL(__CONCAT(name,_ras_start)):
  125 
  126 #define RAS_END_ASM_HIDDEN(name)                                        \
  127         .globl _C_LABEL(__CONCAT(name,_ras_end))        _ASM_LS_CHAR    \
  128         .hidden _C_LABEL(__CONCAT(name,_ras_end))       _ASM_LS_CHAR    \
  129         _C_LABEL(__CONCAT(name,_ras_end)):
  130 #endif /* __ASSEMBLER__ */
  131 
  132 #endif /* _KERNEL */
  133 
  134 #endif /* !_SYS_RAS_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/sys/ras.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/ras.h