mirror of
https://github.com/kanjitalk755/macemu.git
synced 2024-06-11 13:29:30 +00:00
210 lines
4.2 KiB
C++
210 lines
4.2 KiB
C++
/*
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* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
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*
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* Basilisk II (C) 1997-1999 Christian Bauer
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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 02111-1307 USA
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*/
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#include "sysdeps.h"
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#include "cpu_emulation.h"
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#include "main.h"
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#include "emul_op.h"
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#include "rom_patches.h"
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#include "timer.h"
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#include "m68k.h"
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#include "memory.h"
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#include "readcpu.h"
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#include "newcpu.h"
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// RAM and ROM pointers
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uint32 RAMBaseMac; // RAM base (Mac address space)
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uint8 *RAMBaseHost; // RAM base (host address space)
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uint32 RAMSize; // Size of RAM
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uint32 ROMBaseMac; // ROM base (Mac address space)
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uint8 *ROMBaseHost; // ROM base (host address space)
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uint32 ROMSize; // Size of ROM
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#if !REAL_ADDRESSING
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// Mac frame buffer
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uint8 *MacFrameBaseHost; // Frame buffer base (host address space)
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uint32 MacFrameSize; // Size of frame buffer
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int MacFrameLayout; // Frame buffer layout
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#endif
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#if DIRECT_ADDRESSING
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uintptr MEMBaseDiff; // Global offset between a Mac address and its Host equivalent
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#endif
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// From newcpu.cpp
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extern int quit_program;
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/*
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* Initialize 680x0 emulation, CheckROM() must have been called first
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*/
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bool Init680x0(void)
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{
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#if REAL_ADDRESSING
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// Mac address space = host address space minus constant offset (MEMBaseDiff)
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// NOTE: MEMBaseDiff is set up in main_unix.cpp/main()
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RAMBaseMac = 0;
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ROMBaseMac = Host2MacAddr(ROMBaseHost);
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#endif
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init_m68k();
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return true;
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}
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/*
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* Deinitialize 680x0 emulation
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*/
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void Exit680x0(void)
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{
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}
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/*
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* Reset and start 680x0 emulation (doesn't return)
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*/
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void Start680x0(void)
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{
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m68k_reset();
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m68k_go(true);
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}
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/*
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* Trigger interrupt
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*/
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void TriggerInterrupt(void)
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{
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idle_resume();
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regs.spcflags |= SPCFLAG_INT;
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}
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void TriggerNMI(void)
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{
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//!! not implemented yet
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}
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/*
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* Get 68k interrupt level
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*/
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int intlev(void)
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{
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return InterruptFlags ? 1 : 0;
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}
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/*
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* Execute MacOS 68k trap
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* r->a[7] and r->sr are unused!
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*/
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void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
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{
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int i;
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// Save old PC
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uaecptr oldpc = m68k_getpc();
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// Set registers
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for (i=0; i<8; i++)
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m68k_dreg(regs, i) = r->d[i];
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for (i=0; i<7; i++)
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m68k_areg(regs, i) = r->a[i];
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// Push trap and EXEC_RETURN on stack
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m68k_areg(regs, 7) -= 2;
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put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
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m68k_areg(regs, 7) -= 2;
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put_word(m68k_areg(regs, 7), trap);
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// Execute trap
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m68k_setpc(m68k_areg(regs, 7));
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fill_prefetch_0();
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quit_program = 0;
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m68k_go(true);
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// Clean up stack
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m68k_areg(regs, 7) += 4;
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// Restore old PC
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m68k_setpc(oldpc);
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fill_prefetch_0();
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// Get registers
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for (i=0; i<8; i++)
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r->d[i] = m68k_dreg(regs, i);
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for (i=0; i<7; i++)
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r->a[i] = m68k_areg(regs, i);
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quit_program = 0;
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}
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/*
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* Execute 68k subroutine
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* The executed routine must reside in UAE memory!
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* r->a[7] and r->sr are unused!
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*/
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void Execute68k(uint32 addr, struct M68kRegisters *r)
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{
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int i;
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// Save old PC
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uaecptr oldpc = m68k_getpc();
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// Set registers
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for (i=0; i<8; i++)
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m68k_dreg(regs, i) = r->d[i];
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for (i=0; i<7; i++)
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m68k_areg(regs, i) = r->a[i];
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// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
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m68k_areg(regs, 7) -= 2;
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put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
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m68k_areg(regs, 7) -= 4;
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put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
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// Execute routine
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m68k_setpc(addr);
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fill_prefetch_0();
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quit_program = 0;
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m68k_go(true);
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// Clean up stack
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m68k_areg(regs, 7) += 2;
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// Restore old PC
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m68k_setpc(oldpc);
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fill_prefetch_0();
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// Get registers
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for (i=0; i<8; i++)
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r->d[i] = m68k_dreg(regs, i);
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for (i=0; i<7; i++)
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r->a[i] = m68k_areg(regs, i);
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quit_program = 0;
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}
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