arch/x86/include/sys/bootregs.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_BOOTREGS_H
  28 #define _SYS_BOOTREGS_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 #if defined(_KERNEL) || defined(_BOOT)
  37
  38 /*
  39  *  This structure is used by bootops to save/restore registers when
  40  *  transferring between protected and realmode code.
  41  *
  42  *  NOTE: The following macros require an ANSI compiler!
  43  */
  44
  45 #define i8080reg(r) union {  /* 8080-like "general purpose" registers */\
  46         uint32_t e ## r ## x;                                   \
  47         struct { uint16_t r ## x; } word;                               \
  48         struct { uint8_t  r ## l, r ## h; } byte;                       \
  49 }
  50
  51 #define i8086reg(r) union { /* 16/32-bit "special purpose" registers  */\
  52         uint32_t e ## r;                                                \
  53         struct { uint16_t r; } word;                            \
  54 }
  55
  56 struct bop_regs {
  57         /*
  58          *  Machine state structure for realmode <-> protected mode callout
  59          *  operations:
  60          */
  61
  62         i8080reg(a) eax;        /* The so-called "general purpose" registers */
  63         i8080reg(d) edx;
  64         i8080reg(c) ecx;
  65         i8080reg(b) ebx;
  66
  67         i8086reg(bp) ebp;       /* 16/32-bit "pointer" registers */
  68         i8086reg(si) esi;
  69         i8086reg(di) edi;
  70
  71         uint16_t ds;    /* Segment registers */
  72         uint16_t es;
  73         uint16_t fs;
  74         uint16_t gs;
  75
  76         uint32_t eflags;
  77 };
  78
  79 #undef  i8080reg
  80 #undef  i8086reg
  81 #endif  /* _KERNEL || _BOOT */
  82
  83 #ifdef __cplusplus
  84 }
  85 #endif
  86
  87 #endif  /* _SYS_BOOTREGS_H */