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/* |
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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) 1997-2001 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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|
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#include "sysdeps.h" |
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|
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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 "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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|
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|
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// RAM and ROM pointers |
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uint32 RAMBaseMac = 0; // RAM base (Mac address space) gb-- init is important |
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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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|
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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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|
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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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|
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// From newcpu.cpp |
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extern int quit_program; |
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|
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|
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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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|
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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 |
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RAMBaseMac = (uint32)RAMBaseHost; |
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ROMBaseMac = (uint32)ROMBaseHost; |
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#elif DIRECT_ADDRESSING |
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InitMEMBaseDiff(RAMBaseHost, RAMBaseMac); |
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#else |
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// Initialize UAE memory banks |
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RAMBaseMac = 0; |
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switch (ROMVersion) { |
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case ROM_VERSION_64K: |
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case ROM_VERSION_PLUS: |
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case ROM_VERSION_CLASSIC: |
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ROMBaseMac = 0x00400000; |
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break; |
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case ROM_VERSION_II: |
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ROMBaseMac = 0x00a00000; |
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break; |
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case ROM_VERSION_32: |
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ROMBaseMac = 0x40800000; |
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break; |
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default: |
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return false; |
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} |
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memory_init(); |
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#endif |
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|
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init_m68k(); |
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return true; |
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} |
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|
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|
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/* |
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* Deinitialize 680x0 emulation |
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*/ |
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|
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void Exit680x0(void) |
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{ |
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exit_m68k(); |
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} |
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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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|
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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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|
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/* |
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* Trigger interrupt |
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*/ |
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|
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void TriggerInterrupt(void) |
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{ |
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regs.spcflags |= SPCFLAG_INT; |
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} |
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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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|
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/* |
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* Get 68k interrupt level |
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*/ |
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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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|
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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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|
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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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|
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// Save old PC |
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uaecptr oldpc = m68k_getpc(); |
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|
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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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|
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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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|
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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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|
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// Clean up stack |
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m68k_areg(regs, 7) += 4; |
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|
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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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|
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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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|
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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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|
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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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|
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// Save old PC |
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uaecptr oldpc = m68k_getpc(); |
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|
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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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|
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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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|
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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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|
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// Clean up stack |
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m68k_areg(regs, 7) += 2; |
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|
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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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|
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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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} |
