The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/copyout.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2018 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
    8  * under sponsorship from the FreeBSD Foundation.
    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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: head/sys/amd64/amd64/copyout.c 338837 2018-09-20 18:30:17Z mjg $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 
   38 #include <machine/md_var.h>
   39 #include <machine/specialreg.h>
   40 #include <x86/ifunc.h>
   41 
   42 int fubyte_nosmap(volatile const void *base);
   43 int fubyte_smap(volatile const void *base);
   44 DEFINE_IFUNC(, int, fubyte, (volatile const void *), static)
   45 {
   46 
   47         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   48             fubyte_smap : fubyte_nosmap);
   49 }
   50 
   51 int fuword16_nosmap(volatile const void *base);
   52 int fuword16_smap(volatile const void *base);
   53 DEFINE_IFUNC(, int, fuword16, (volatile const void *), static)
   54 {
   55 
   56         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   57             fuword16_smap : fuword16_nosmap);
   58 }
   59 
   60 int fueword_nosmap(volatile const void *base, long *val);
   61 int fueword_smap(volatile const void *base, long *val);
   62 DEFINE_IFUNC(, int, fueword, (volatile const void *, long *), static)
   63 {
   64 
   65         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   66             fueword_smap : fueword_nosmap);
   67 }
   68 DEFINE_IFUNC(, int, fueword64, (volatile const void *, int64_t *), static)
   69 {
   70 
   71         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   72             fueword_smap : fueword_nosmap);
   73 }
   74 
   75 int     fueword32_nosmap(volatile const void *base, int32_t *val);
   76 int     fueword32_smap(volatile const void *base, int32_t *val);
   77 DEFINE_IFUNC(, int, fueword32, (volatile const void *, int32_t *), static)
   78 {
   79 
   80         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   81             fueword32_smap : fueword32_nosmap);
   82 }
   83 
   84 int     subyte_nosmap(volatile void *base, int byte);
   85 int     subyte_smap(volatile void *base, int byte);
   86 DEFINE_IFUNC(, int, subyte, (volatile void *, int), static)
   87 {
   88 
   89         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   90             subyte_smap : subyte_nosmap);
   91 }
   92 
   93 int     suword16_nosmap(volatile void *base, int word);
   94 int     suword16_smap(volatile void *base, int word);
   95 DEFINE_IFUNC(, int, suword16, (volatile void *, int), static)
   96 {
   97 
   98         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
   99             suword16_smap : suword16_nosmap);
  100 }
  101 
  102 int     suword32_nosmap(volatile void *base, int32_t word);
  103 int     suword32_smap(volatile void *base, int32_t word);
  104 DEFINE_IFUNC(, int, suword32, (volatile void *, int32_t), static)
  105 {
  106 
  107         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  108             suword32_smap : suword32_nosmap);
  109 }
  110 
  111 int     suword_nosmap(volatile void *base, long word);
  112 int     suword_smap(volatile void *base, long word);
  113 DEFINE_IFUNC(, int, suword, (volatile void *, long), static)
  114 {
  115 
  116         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  117             suword_smap : suword_nosmap);
  118 }
  119 DEFINE_IFUNC(, int, suword64, (volatile void *, int64_t), static)
  120 {
  121 
  122         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  123             suword_smap : suword_nosmap);
  124 }
  125 
  126 int     casueword32_nosmap(volatile uint32_t *base, uint32_t oldval,
  127             uint32_t *oldvalp, uint32_t newval);
  128 int     casueword32_smap(volatile uint32_t *base, uint32_t oldval,
  129             uint32_t *oldvalp, uint32_t newval);
  130 DEFINE_IFUNC(, int, casueword32, (volatile uint32_t *, uint32_t, uint32_t *,
  131     uint32_t), static)
  132 {
  133 
  134         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  135             casueword32_smap : casueword32_nosmap);
  136 }
  137 
  138 int     casueword_nosmap(volatile u_long *p, u_long oldval, u_long *oldvalp,
  139             u_long newval);
  140 int     casueword_smap(volatile u_long *p, u_long oldval, u_long *oldvalp,
  141             u_long newval);
  142 DEFINE_IFUNC(, int, casueword, (volatile u_long *, u_long, u_long *, u_long),
  143     static)
  144 {
  145 
  146         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  147             casueword_smap : casueword_nosmap);
  148 }
  149 
  150 int     copyinstr_nosmap(const void *udaddr, void *kaddr, size_t len,
  151             size_t *lencopied);
  152 int     copyinstr_smap(const void *udaddr, void *kaddr, size_t len,
  153             size_t *lencopied);
  154 DEFINE_IFUNC(, int, copyinstr, (const void *, void *, size_t, size_t *),
  155     static)
  156 {
  157 
  158         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  159             copyinstr_smap : copyinstr_nosmap);
  160 }
  161 
  162 int     copyin_nosmap_std(const void *udaddr, void *kaddr, size_t len);
  163 int     copyin_smap_std(const void *udaddr, void *kaddr, size_t len);
  164 int     copyin_nosmap_erms(const void *udaddr, void *kaddr, size_t len);
  165 int     copyin_smap_erms(const void *udaddr, void *kaddr, size_t len);
  166 DEFINE_IFUNC(, int, copyin, (const void *, void *, size_t), static)
  167 {
  168 
  169         switch (cpu_stdext_feature & (CPUID_STDEXT_SMAP | CPUID_STDEXT_ERMS)) {
  170         case CPUID_STDEXT_SMAP:
  171                 return (copyin_smap_std);
  172         case CPUID_STDEXT_ERMS:
  173                 return (copyin_nosmap_erms);
  174         case CPUID_STDEXT_SMAP | CPUID_STDEXT_ERMS:
  175                 return (copyin_smap_erms);
  176         default:
  177                 return (copyin_nosmap_std);
  178 
  179         }
  180 }
  181 
  182 int     copyout_nosmap_std(const void *kaddr, void *udaddr, size_t len);
  183 int     copyout_smap_std(const void *kaddr, void *udaddr, size_t len);
  184 int     copyout_nosmap_erms(const void *kaddr, void *udaddr, size_t len);
  185 int     copyout_smap_erms(const void *kaddr, void *udaddr, size_t len);
  186 DEFINE_IFUNC(, int, copyout, (const void *, void *, size_t), static)
  187 {
  188 
  189         switch (cpu_stdext_feature & (CPUID_STDEXT_SMAP | CPUID_STDEXT_ERMS)) {
  190         case CPUID_STDEXT_SMAP:
  191                 return (copyout_smap_std);
  192         case CPUID_STDEXT_ERMS:
  193                 return (copyout_nosmap_erms);
  194         case CPUID_STDEXT_SMAP | CPUID_STDEXT_ERMS:
  195                 return (copyout_smap_erms);
  196         default:
  197                 return (copyout_nosmap_std);
  198         }
  199 }

Cache object: da0dd010e985d120857c82215ee72f0f


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