register.h

开放源码的编译器open watcom 1.6.0版的源代码

/*
 *  This file contains definition and constants related to Intel Cpu
 *
 *  COPYRIGHT (c) 1998 [e-mail]
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: registers.h,v 1.1 1998/08/05 15:15:46 joel Exp $
 */

#ifndef _LIBCPU_i386_REGISTERS_H
#define _LIBCPU_i386_REGISTERS_H

/*
 * definition related to EFLAGS
 */
#define EFLAGS_CARRY                    0x1
#define EFLAGS_PARITY                   0x4

#define EFLAGS_AUX_CARRY                0x10
#define EFLAGS_ZERO                     0x40
#define EFLAGS_SIGN                     0x80

#define EFLAGS_TRAP                     0x100
#define EFLAGS_INTR_ENABLE              0x200
#define EFLAGS_DIRECTION                0x400
#define EFLAGS_OVERFLOW                 0x800

#define        EFLAGS_IOPL_MASK         0x3000
#define EFLAGS_NESTED_TASK              0x8000

#define EFLAGS_RESUME                   0x10000
#define EFLAGS_VIRTUAL_MODE             0x20000
#define EFLAGS_ALIGN_CHECK              0x40000
#define EFLAGS_VIRTUAL_INTR             0x80000

#define EFLAGS_VIRTUAL_INTR_PEND        0x100000
#define EFLAGS_ID                       0x200000

/*
 * definitions related to CR0
 */
#define CR0_PROTECTION_ENABLE           0x1
#define CR0_MONITOR_COPROC              0x2
#define CR0_COPROC_SOFT_EMUL            0x4
#define CR0_FLOATING_INSTR_EXCEPTION    0x8

#define CR0_EXTENSION_TYPE              0x10
#define CR0_NUMERIC_ERROR               0x20

#define CR0_WRITE_PROTECT               0x10000
#define CR0_ALIGMENT_MASK               0x40000

#define CR0_NO_WRITE_THROUGH            0x20000000
#define CR0_PAGE_LEVEL_CACHE_DISABLE    0x40000000
#define CR0_PAGING                      0x80000000

#ifndef ASM

/*
 * definition of eflags registers has a bit field structure
 */
typedef struct {
  /*
   * first byte : bits 0->7
   */
  unsigned int carry                : 1;
  unsigned int                      : 1;
  unsigned int parity               : 1;
  unsigned int                      : 1;

  unsigned int auxiliary_carry      : 1;
  unsigned int                      : 1;
  unsigned int zero                 : 1;      /* result is zero */
  unsigned int sign                 : 1;      /* result is less than zero */
  /*
   * Second byte : bits 7->15
   */
  unsigned int trap                 : 1;
  unsigned int intr_enable          : 1;      /* set => intr on */
  unsigned int direction            : 1;      /* set => autodecrement */
  unsigned int overflow             : 1;

  unsigned int IO_privilege         : 2;
  unsigned int nested_task          : 1;
  unsigned int                      : 1;
  /*
   * Third byte : bits 15->23
   */
  unsigned int resume               : 1;
  unsigned int virtual_mode         : 1;
  unsigned int aligment_check       : 1;
  unsigned int virtual_intr         : 1;
  unsigned int virtual_intr_pending : 1;
  unsigned int id                   : 1;
  unsigned int                      : 2;
  /*
   * fourth byte : bits 24->31 : UNUSED
   */
  unsigned int                      : 8;
} eflags_bits;

typedef union {
        eflags_bits   eflags;
        unsigned int  i;
      } eflags;

/*
 * definition of CR registers has a bit field structure
 */
typedef struct {
  /*
   * first byte : bits 0->7
   */
  unsigned int protection_enable        : 1;
  unsigned int monitor_coproc           : 1;
  unsigned int coproc_soft_emul         : 1;
  unsigned int floating_instr_except    : 1;
  
  unsigned int extension_type           : 1;
  unsigned int numeric_error            : 1;
  unsigned int                          : 2;
  /*
   * second byte 8->15 : UNUSED
   */
  unsigned int                          : 8;
  /*
   * third byte 16->23
   */
  unsigned int write_protect            : 1;
  unsigned int                          : 1;
  unsigned int aligment_mask            : 1;
  unsigned int                          : 1;

  unsigned int                          : 4;
  /*
   * fourth byte 24->31
   */
  unsigned int                          : 4;
  unsigned int                          : 1;
  unsigned int no_write_through         : 1;
  unsigned int page_level_cache_disable : 1;
  unsigned int paging                   : 1;
} cr0_bits;

typedef union {
        cr0_bits      cr0;
        unsigned long i;
      } cr0;

#endif  /* ASM */

#endif