/*-
 * Copyright (c) 2009 Alex Keda <admin@lissyara.su>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*
 * x86 registers were borrowed from x86emu.h x86emu_regs.h
 * for compatibility.
 */

#ifndef _X86BIOS_H_
#define _X86BIOS_H_

#include <sys/endian.h>
#include <sys/systm.h>
#include <sys/types.h>

#ifdef  __BIG_ENDIAN__

struct x86_register32 {
        uint32_t                e_reg;
};

struct x86_register16 {
        uint16_t                filler0;
        uint16_t                x_reg;
};

struct x86_register8 {
        uint8_t                 filler0;
        uint8_t                 filler1;
        uint8_t                 h_reg;
        uint8_t                 l_reg;
};

#else /* !__BIG_ENDIAN__ */

struct x86_register32 {
        uint32_t                e_reg;
};

struct x86_register16 {
        uint16_t                x_reg;
};

struct x86_register8 {
        uint8_t                 l_reg;
        uint8_t                 h_reg;
};

#endif /* __BIG_ENDIAN__ */

union x86_register {
        struct x86_register32   I32_reg;
        struct x86_register16   I16_reg;
        struct x86_register8    I8_reg;
};

struct x86regs {
        uint16_t                _pad0;          /* CS */
        uint16_t                _pad1;          /* DS */
        uint16_t                register_es;
        uint16_t                register_fs;
        uint16_t                register_gs;
        uint16_t                _pad2;          /* SS */
        uint32_t                register_flags;
        union x86_register      register_a;
        union x86_register      register_b;
        union x86_register      register_c;
        union x86_register      register_d;

        union x86_register      _pad3;          /* SP */
        union x86_register      register_bp;
        union x86_register      register_si;
        union x86_register      register_di;
};

typedef struct x86regs  x86regs_t;

/* 8 bit registers */
#define R_AH            register_a.I8_reg.h_reg
#define R_AL            register_a.I8_reg.l_reg
#define R_BH            register_b.I8_reg.h_reg
#define R_BL            register_b.I8_reg.l_reg
#define R_CH            register_c.I8_reg.h_reg
#define R_CL            register_c.I8_reg.l_reg
#define R_DH            register_d.I8_reg.h_reg
#define R_DL            register_d.I8_reg.l_reg

/* 16 bit registers */
#define R_AX            register_a.I16_reg.x_reg
#define R_BX            register_b.I16_reg.x_reg
#define R_CX            register_c.I16_reg.x_reg
#define R_DX            register_d.I16_reg.x_reg

/* 32 bit extended registers */
#define R_EAX           register_a.I32_reg.e_reg
#define R_EBX           register_b.I32_reg.e_reg
#define R_ECX           register_c.I32_reg.e_reg
#define R_EDX           register_d.I32_reg.e_reg

/* special registers */
#define R_BP            register_bp.I16_reg.x_reg
#define R_SI            register_si.I16_reg.x_reg
#define R_DI            register_di.I16_reg.x_reg
#define R_FLG           register_flags

/* special registers */
#define R_EBP           register_bp.I32_reg.e_reg
#define R_ESI           register_si.I32_reg.e_reg
#define R_EDI           register_di.I32_reg.e_reg
#define R_EFLG          register_flags

/* segment registers */
#define R_ES            register_es
#define R_FS            register_fs
#define R_GS            register_gs

#define X86BIOS_PHYSTOSEG(x)    (((x) >> 4) & 0xff00)
#define X86BIOS_PHYSTOOFF(x)    ((x) & 0x0fff)

__BEGIN_DECLS
void    *x86bios_alloc(uint32_t *offset, size_t size, int flags);
void     x86bios_call(struct x86regs *regs, uint16_t seg, uint16_t off);
void     x86bios_free(void *addr, size_t size);
uint32_t x86bios_get_intr(int intno);
void    *x86bios_get_orm(uint32_t offset);
void     x86bios_init_regs(struct x86regs *regs);
void     x86bios_intr(struct x86regs *regs, int intno);
int      x86bios_match_device(uint32_t offset, device_t dev);
void    *x86bios_offset(uint32_t offset);
void     x86bios_set_intr(int intno, uint32_t saddr);
__END_DECLS

#endif /* !_X86BIOS_H_ */