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- specific EOI doesn't clear the IRR bit 

- service_master_pic() / service_slave_pic() do clear the IRR bit
- new IRQ signal handling prepared
This commit is contained in:
Volker Ruppert 2002-01-26 12:03:55 +00:00
parent 6461cb2ab9
commit 4d4be62283
1 changed files with 21 additions and 6 deletions
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27
bochs/iodev/pic.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: pic.cc,v 1.18 2002-01-15 20:42:51 vruppert Exp $
// $Id: pic.cc,v 1.19 2002-01-26 12:03:55 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
@ -103,6 +103,10 @@ bx_pic_c::init(bx_devices_c *d)
BX_PIC_THIS s.slave_pic.init.requires_4 = 0;
BX_PIC_THIS s.slave_pic.init.byte_expected = 0;
BX_PIC_THIS s.slave_pic.special_mask = 0;
for (unsigned i=0; i<8; i++) { /* all IRQ lines low */
BX_PIC_THIS s.master_pic.IRQ_line[i] = 0;
BX_PIC_THIS s.slave_pic.IRQ_line[i] = 0;
}
}
@ -295,7 +299,6 @@ bx_pic_c::write(Bit32u address, Bit32u value, unsigned io_len)
case 0x66: /* specific EOI 6 */
case 0x67: /* specific EOI 7 */
BX_PIC_THIS s.master_pic.isr &= ~(1 << (value-0x60));
BX_PIC_THIS s.master_pic.irr &= ~(1 << (value-0x60));
service_master_pic();
break;
@ -443,7 +446,6 @@ bx_pic_c::write(Bit32u address, Bit32u value, unsigned io_len)
case 0x66: /* specific EOI 6 */
case 0x67: /* specific EOI 7 */
BX_PIC_THIS s.slave_pic.isr &= ~(1 << (value-0x60));
BX_PIC_THIS s.slave_pic.irr &= ~(1 << (value-0x60));
service_slave_pic();
break;
@ -518,6 +520,22 @@ bx_pic_c::write(Bit32u address, Bit32u value, unsigned io_len)
return;
}
// new IRQ signal handling routines (under construction)
void
bx_pic_c::lower_irq(unsigned irq_no)
{
UNUSED(irq_no);
}
void
bx_pic_c::raise_irq(unsigned irq_no)
{
UNUSED(irq_no);
}
// current IRQ handling routines
void
bx_pic_c::trigger_irq(unsigned irq_no)
{
@ -621,8 +639,6 @@ bx_pic_c::service_master_pic(void)
continue;
if (unmasked_requests & (1 << irq)) {
BX_DEBUG(("signalling IRQ(%u)", (unsigned) irq));
BX_PIC_THIS s.master_pic.irr &= ~(1 << irq);
/*??? do for slave too: BX_PIC_THIS s.master_pic.isr |= (1 << irq);*/
BX_PIC_THIS s.master_pic.INT = 1;
BX_SET_INTR(1);
BX_PIC_THIS s.master_pic.irq = irq;
@ -678,7 +694,6 @@ bx_pic_c::service_slave_pic(void)
if (bx_dbg.pic)
BX_DEBUG(("slave: signalling IRQ(%u)",
(unsigned) 8 + irq));
BX_PIC_THIS s.slave_pic.irr &= ~(1 << irq);
BX_PIC_THIS s.slave_pic.INT = 1;
BX_PIC_THIS s.master_pic.irr |= 0x04; /* request IRQ 2 on master pic */
BX_PIC_THIS s.slave_pic.irq = irq;