proc_reg.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 
   27 /*
   28  * HISTORY
   29  * $Log:        proc_reg.h,v $
   30  * Revision 2.4  92/01/03  20:08:42  dbg
   31  *      Add macros to get and set various privileged registers.
   32  *      [91/10/20            dbg]
   33  * 
   34  * Revision 2.3  91/05/14  16:15:32  mrt
   35  *      Correcting copyright
   36  * 
   37  * Revision 2.2  91/05/08  12:41:37  dbg
   38  *      Created.
   39  *      [91/03/21            dbg]
   40  * 
   41  */
   42 
   43 /*
   44  * Processor registers for i386 and i486.
   45  */
   46 #ifndef _I386_PROC_REG_H_
   47 #define _I386_PROC_REG_H_
   48 
   49 /*
   50  * CR0
   51  */
   52 #define CR0_PG  0x80000000              /*       enable paging */
   53 #define CR0_CD  0x40000000              /* i486: cache disable */
   54 #define CR0_NW  0x20000000              /* i486: no write-through */
   55 #define CR0_AM  0x00040000              /* i486: alignment check mask */
   56 #define CR0_WP  0x00010000              /* i486: write-protect kernel access */
   57 #define CR0_NE  0x00000020              /* i486: handle numeric exceptions */
   58 #define CR0_ET  0x00000010              /*       extension type is 80387 */
   59                                         /*       (not official) */
   60 #define CR0_TS  0x00000008              /*       task switch */
   61 #define CR0_EM  0x00000004              /*       emulate coprocessor */
   62 #define CR0_MP  0x00000002              /*       monitor coprocessor */
   63 #define CR0_PE  0x00000001              /*       enable protected mode */
   64 
   65 #ifndef ASSEMBLER
   66 #ifdef  __GNUC__
   67 
   68 #define get_cr0() \
   69     ({ \
   70         register unsigned int _temp__; \
   71         asm("mov %%cr0, %0" : "=r" (_temp__)); \
   72         _temp__; \
   73     })
   74 
   75 #define set_cr0(value) \
   76     ({ \
   77         register unsigned int _temp__ = (value); \
   78         asm volatile("mov %0, %%cr0" : : "r" (_temp__)); \
   79      })
   80 
   81 #define get_cr2() \
   82     ({ \
   83         register unsigned int _temp__; \
   84         asm("mov %%cr2, %0" : "=r" (_temp__)); \
   85         _temp__; \
   86     })
   87 
   88 #define get_cr3() \
   89     ({ \
   90         register unsigned int _temp__; \
   91         asm("mov %%cr3, %0" : "=r" (_temp__)); \
   92         _temp__; \
   93     })
   94 
   95 #define set_cr3(value) \
   96     ({ \
   97         register unsigned int _temp__ = (value); \
   98         asm volatile("mov %0, %%cr3" : : "r" (_temp__)); \
   99      })
  100 
  101 #define set_ts() \
  102         set_cr0(get_cr0() | CR0_TS)
  103 
  104 #define clear_ts() \
  105         asm volatile("clts")
  106 
  107 #define get_tr() \
  108     ({ \
  109         unsigned short _seg__; \
  110         asm volatile("str %0" : "=rm" (_seg__) ); \
  111         _seg__; \
  112     })
  113 
  114 #define set_tr(seg) \
  115         asm volatile("ltr %0" : : "rm" ((unsigned short)(seg)) )
  116 
  117 #define get_ldt() \
  118     ({ \
  119         unsigned short _seg__; \
  120         asm volatile("sldt %0" : "=rm" (_seg__) ); \
  121         _seg__; \
  122     })
  123 
  124 #define set_ldt(seg) \
  125         asm volatile("lldt %0" : : "rm" ((unsigned short)(seg)) )
  126 
  127 #endif  /* __GNUC__ */
  128 #endif  /* ASSEMBLER */
  129 
  130 #endif  /* _I386_PROC_REG_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/i386/proc_reg.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/proc_reg.h