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/* Project:     OSLib
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 * Description: The OS Construction Kit
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 * Date:                1.6.2000
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 * Idea by:             Luca Abeni & Gerardo Lamastra
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 *
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 * OSLib is an SO project aimed at developing a common, easy-to-use
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 * low-level infrastructure for developing OS kernels and Embedded
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 * Applications; it partially derives from the HARTIK project but it
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 * currently is independently developed.
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 *
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 * OSLib is distributed under GPL License, and some of its code has
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 * been derived from the Linux kernel source; also some important
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 * ideas come from studying the DJGPP go32 extender.
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 *
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 * We acknowledge the Linux Community, Free Software Foundation,
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 * D.J. Delorie and all the other developers who believe in the
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 * freedom of software and ideas.
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 *
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 * For legalese, check out the included GPL license.
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 */
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/* System calls for X extender                          */
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/* BIOS Call from X (Basic Reflection Service)          */
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#include <ll/i386/hw-data.h>
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#include <ll/i386/x-bios.h>
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#include <ll/i386/mem.h>
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#include <ll/i386/advtimer.h>
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#include <ll/i386/apic.h>
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FILE(X-BIOS);
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/* The interface between X (and 32 bit PM) and BIOS (which runs at 16 bits */
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/* It works as int86() standard library call                               */
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void X_callBIOS(int service,X_REGS16 *in,X_REGS16 *out,X_SREGS16 *s)
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{
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    /* Assembler gate JMP instruction */
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    extern unsigned char use_apic;
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    extern void _x_callBIOS(void);
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    X_CALLBIOS *xbc = x_bios_address();
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    DWORD msr1 = 0,msr2 = 0;
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    /* Send interrupt request & register through the X_Info structure */
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    xbc->_irqno = service;
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    memcpy(&(xbc->_ir),in,sizeof(X_REGS16));
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    memcpy(&(xbc->_sr),s,sizeof(X_SREGS16));
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    if (use_apic) {
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      rdmsr(APIC_BASE_MSR,msr1,msr2);
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      disable_APIC_timer();    
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    }
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    /* Back to RM to execute the BIOS routine */
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    _x_callBIOS();
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    /* Get the return register values */
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    if (use_apic) {
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      wrmsr(APIC_BASE_MSR,msr1,msr2);
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      enable_APIC_timer();
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    }
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    memcpy(out,&(xbc->_or),sizeof(X_REGS16));
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    memcpy(s,&(xbc->_sr),sizeof(X_SREGS16));
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}