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88 lines
3.5 KiB
C
88 lines
3.5 KiB
C
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/*
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* 6510core.h - Core definitions for the MOS 6510 CPU emulation.
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*
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* Written by
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* Ettore Perazzoli <ettore@comm2000.it>
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* Andreas Boose <viceteam@t-online.de>
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*
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* This file is part of VICE, the Versatile Commodore Emulator.
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* See README for copyright notice.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA.
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*
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*/
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#ifndef _6510CORE_H
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#define _6510CORE_H
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/* Masks to extract information. */
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#define OPINFO_DELAYS_INTERRUPT_MSK (1 << 8)
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#define OPINFO_DISABLES_IRQ_MSK (1 << 9)
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#define OPINFO_ENABLES_IRQ_MSK (1 << 10)
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/* Return nonzero if `opinfo' causes a 1-cycle interrupt delay. */
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#define OPINFO_DELAYS_INTERRUPT(opinfo) \
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((opinfo) & OPINFO_DELAYS_INTERRUPT_MSK)
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/* Return nonzero if `opinfo' has changed the I flag from 0 to 1, so that an
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IRQ that happened 2 or more cycles before the end of the opcode should be
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allowed. */
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#define OPINFO_DISABLES_IRQ(opinfo) \
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((opinfo) & OPINFO_DISABLES_IRQ_MSK)
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/* Return nonzero if `opinfo' has changed the I flag from 1 to 0, so that an
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IRQ that happened 2 or more cycles before the end of the opcode should not
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be allowed. */
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#define OPINFO_ENABLES_IRQ(opinfo) \
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((opinfo) & OPINFO_ENABLES_IRQ_MSK)
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/* Set the information for `opinfo'. `number' is the opcode number,
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`delays_interrupt' must be non-zero if it causes a 1-cycle interrupt
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delay, `disables_interrupts' must be non-zero if it disabled IRQs. */
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#define OPINFO_SET(opinfo, \
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number, delays_interrupt, disables_irq, enables_irq) \
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((opinfo) = ((number) \
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| ((delays_interrupt) ? OPINFO_DELAYS_INTERRUPT_MSK : 0) \
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| ((disables_irq) ? OPINFO_DISABLES_IRQ_MSK : 0) \
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| ((enables_irq) ? OPINFO_ENABLES_IRQ_MSK : 0)))
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/* Set whether the opcode causes the 1-cycle interrupt delay according to
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`delay'. */
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#define OPINFO_SET_DELAYS_INTERRUPT(opinfo, delay) \
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do { \
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if ((delay)) \
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(opinfo) |= OPINFO_DELAYS_INTERRUPT_MSK; \
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} while (0)
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/* Set whether the opcode disables previously enabled IRQs according to
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`disable'. */
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#define OPINFO_SET_DISABLES_IRQ(opinfo, disable) \
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do { \
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if ((disable)) \
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(opinfo) |= OPINFO_DISABLES_IRQ_MSK; \
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} while (0)
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/* Set whether the opcode enables previously disabled IRQs according to
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`enable'. */
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#define OPINFO_SET_ENABLES_IRQ(opinfo, enable) \
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do { \
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if ((enable)) \
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(opinfo) |= OPINFO_ENABLES_IRQ_MSK; \
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} while (0)
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#endif
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