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From:	"turomas" <josepmaria AT turomas DOT com>
To:	<djgpp AT delorie DOT com>
References:	<ZtDJc.129847$wH4 DOT 7032125 AT twister DOT southeast DOT rr DOT com>
Subject:	Re: PM hardware interrupts
Date:	Fri, 16 Jul 2004 08:52:38 +0200
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Reply-To:	djgpp AT delorie DOT com

Try with this code. It works for me very well for long time ago.


void configurar()
{
int div;
disable();
           //configura timers
if(tipus_timer==0){
 outportb(B_TIMER+3,0x80|0x36);
 outportb(B_TIMER+2,4);
 outportb(B_TIMER+2,0);
 outportb(B_TIMER+3,0x40|0x36);
 outportb(B_TIMER+1,(unsigned char)(div&0xff));
 outportb(B_TIMER+1,(unsigned char)((div&0xff00)>>8));
    }

if(tipus_timer==1){
 outport(B_TIMER,0x8000|(int)div);

if(irqI<8)setvect(irqI+8,ent);         //I create setvect function for
compatibility with Borland
if(irqI>=8)setvect(0x70+irqI-8,ent);
habilita_interrupcio();
if(irqI>=8)outportb(0xa0,0x20);
outportb(0x20,0x20);
enable();
}

void habilita_interrupcio()
{
outportb(0x21,0x0);
if(irqI>=8)outportb(0xa1,0x0);
}

void deshabilita_interrupcio()
{
if(irqI<8) outportb(0x21,(0x1<<irqI));
else outportb(0xa1,(0x1<<(irqI&0x7)));
}

unsigned int state87[200];

void ent()
{
asm("fnsave %0\n\t"
    "fwait\n\t"
    :"=g" (state87)
    );

//Codi interrupció

asm("frstor %0\n\t"
    "fwait\n\t"
    :"=g" (state87)
    );

if(irqI>=8)outportb(0xa0,0x20);
outportb(0x20,0x20);
}


int setvect(int intno,void (*interrupt)())
{
_go32_dpmi_get_protected_mode_interrupt_vector(intno, &old_handler);
new_handler.pm_offset = (int)(ent);
new_handler.pm_selector = _go32_my_cs();
if(chain==1)_go32_dpmi_chain_protected_mode_interrupt_vector(intno,
&new_handler);
if(chain==0){
 _go32_dpmi_allocate_iret_wrapper(&new_handler);
 _go32_dpmi_set_protected_mode_interrupt_vector(intno,&new_handler);
    }
intnombre=intno;  //I have to store irqnum to restore the old interrupt
}

void desconfigura_interrupcio()
{
if(intnombre>=0){
 _go32_dpmi_set_protected_mode_interrupt_vector(intnombre, &old_handler);
 if(chain==0)_go32_dpmi_free_iret_wrapper(&new_handler);
    }
}

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