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/* Project:     OSLib
 * Description: The OS Construction Kit
 * Date:                1.6.2000
 * Idea by:             Luca Abeni & Gerardo Lamastra
 * OSLib is an SO project aimed at developing a common, easy-to-use
 * low-level infrastructure for developing OS kernels and Embedded
 * Applications; it partially derives from the HARTIK project but it
 * currently is independently developed.
 * OSLib is distributed under GPL License, and some of its code has
 * been derived from the Linux kernel source; also some important
 * ideas come from studying the DJGPP go32 extender.
 * We acknowledge the Linux Community, Free Software Foundation,
 * D.J. Delorie and all the other developers who believe in the
 * freedom of software and ideas.
 * For legalese, check out the included GPL license.

/*      For accessing BIOS calls returning in Real Mode, or using VM86  */

#ifndef __LL_I386_X_BIOS_H__
#define __LL_I386_X_BIOS_H__

#include <ll/i386/defs.h>

#include <ll/i386/hw-data.h>
#include <ll/i386/hw-instr.h>

#define DOS_OFF(x)      ((DWORD)(x) & 0x000F)
#define DOS_SEG(x)      (((DWORD)(x) & 0xFFFF0) >> 4)

typedef union x_regs16 {
    struct {
        WORD ax __attribute__ ((packed));
        WORD bx __attribute__ ((packed));
        WORD cx __attribute__ ((packed));
        WORD dx __attribute__ ((packed));
        WORD si __attribute__ ((packed));
        WORD di __attribute__ ((packed));
        WORD cflag __attribute__ ((packed));
        WORD _pad __attribute__ ((packed));
    } x __attribute__ ((packed));
    struct {
                        BYTE al,ah __attribute__ ((packed));
                        BYTE bl,bh __attribute__ ((packed));
                        BYTE cl,ch __attribute__ ((packed));
                        BYTE dl,dh __attribute__ ((packed));
    } h __attribute__ ((packed));
} X_REGS16;

typedef struct x_sregs16 {
        WORD es __attribute__ ((packed));
        WORD cs __attribute__ ((packed));
        WORD ss __attribute__ ((packed));
        WORD ds __attribute__ ((packed));
} X_SREGS16;

typedef struct {
    /* The GDT linear address inheritable from X */
    DWORD _GDT_base;
    /* These are used for BIOS calling  */
    X_REGS16 _ir;
    X_REGS16 _or;
    X_SREGS16 _sr;
    DWORD _irqno;
    /* This is the X version            */
    DWORD _ver;

X_CALLBIOS * x_bios_address(void);
void X_meminfo(LIN_ADDR *b1,DWORD *s1,LIN_ADDR *b2,DWORD *s2);
void X_callBIOS(int service,X_REGS16 *in,X_REGS16 *out,X_SREGS16 *s);
void vm86_init();
TSS *vm86_get_tss(void);
int vm86_callBIOS(int service,X_REGS16 *in,X_REGS16 *out,X_SREGS16 *s);