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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.
 */

/* System calls for X extender                          */
/* BIOS Call from X (Basic Reflection Service)          */

#include <ll/i386/hw-data.h>
#include <ll/i386/x-bios.h>
#include <ll/i386/mem.h>

FILE(X - BIOS);

/* The interface between X (and 32 bit PM) and BIOS (which runs at 16 bits */
/* It works as int86() standard library call                               */

void X_callBIOS(int service, X_REGS16 * in, X_REGS16 * out, X_SREGS16 * s)
{
    /* Assembler gate JMP instruction */
    extern void _x_callBIOS(void);
    X_CALLBIOS *xbc = x_bios_address();

    /* Send interrupt request & register through the X_Info structure */
    xbc->irqno = service;
    memcpy(&(xbc->ir), in, sizeof(X_REGS16));
    memcpy(&(xbc->sr), s, sizeof(X_SREGS16));

    /* Back to RM to execute the BIOS routine */
    _x_callBIOS();

    /* Get the return register values */
    memcpy(out, &(xbc->or), sizeof(X_REGS16));
    memcpy(s, &(xbc->sr), sizeof(X_SREGS16));
}