/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_BOOTREGS_H
#define _SYS_BOOTREGS_H

#ifdef __cplusplus
extern "C" {
#endif

#if defined(_KERNEL) || defined(_BOOT)

/*
 *  This structure is used by bootops to save/restore registers when
 *  transferring between protected and realmode code.
 *
 *  NOTE: The following macros require an ANSI compiler!
 */

#define i8080reg(r) union {  /* 8080-like "general purpose" registers */\
        uint32_t e ## r ## x;                                   \
        struct { uint16_t r ## x; } word;                               \
        struct { uint8_t  r ## l, r ## h; } byte;                       \
}

#define i8086reg(r) union { /* 16/32-bit "special purpose" registers  */\
        uint32_t e ## r;                                                \
        struct { uint16_t r; } word;                            \
}

struct bop_regs {
        /*
         *  Machine state structure for realmode <-> protected mode callout
         *  operations:
         */

        i8080reg(a) eax;        /* The so-called "general purpose" registers */
        i8080reg(d) edx;
        i8080reg(c) ecx;
        i8080reg(b) ebx;

        i8086reg(bp) ebp;       /* 16/32-bit "pointer" registers */
        i8086reg(si) esi;
        i8086reg(di) edi;

        uint16_t ds;    /* Segment registers */
        uint16_t es;
        uint16_t fs;
        uint16_t gs;

        uint32_t eflags;
};

#undef  i8080reg
#undef  i8086reg
#endif  /* _KERNEL || _BOOT */

#ifdef __cplusplus
}
#endif

#endif  /* _SYS_BOOTREGS_H */