mirror of
https://github.com/kanjitalk755/macemu.git
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124 lines
5.5 KiB
C
124 lines
5.5 KiB
C
/*
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* cpu_emulation.h - Definitions for CPU emulation and Mac memory access
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*
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* SheepShaver (C) 1997-2008 Christian Bauer and Marc Hellwig
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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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#ifndef CPU_EMULATION_H
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#define CPU_EMULATION_H
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/*
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* Memory system
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*/
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// Constants
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const uintptr ROM_BASE = 0x40800000; // Base address of ROM
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const uint32 ROM_SIZE = 0x400000; // Size of ROM file
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const uint32 ROM_AREA_SIZE = 0x500000; // Size of ROM area
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const uintptr ROM_END = ROM_BASE + ROM_SIZE; // End of ROM
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const uintptr DR_EMULATOR_BASE = 0x68070000; // Address of DR emulator code
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const uint32 DR_EMULATOR_SIZE = 0x10000; // Size of DR emulator code
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const uintptr DR_CACHE_BASE = 0x69000000; // Address of DR cache
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const uint32 DR_CACHE_SIZE = 0x80000; // Size of DR Cache
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const uintptr KERNEL_DATA_BASE = 0x68ffe000; // Address of Kernel Data
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const uintptr KERNEL_DATA2_BASE = 0x5fffe000; // Alternate address of Kernel Data
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const uint32 KERNEL_AREA_SIZE = 0x2000; // Size of Kernel Data area
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// MacOS 68k Emulator Data
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struct EmulatorData {
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uint32 v[0x400];
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};
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// MacOS Kernel Data
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struct KernelData {
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uint32 v[0x400];
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EmulatorData ed;
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};
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// RAM and ROM pointers (allocated and set by main_*.cpp)
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extern uint32 RAMBase; // Base address of Mac RAM
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extern uint32 RAMSize; // Size address of Mac RAM
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extern uint8 *RAMBaseHost; // Base address of Mac RAM (host address space)
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extern uint8 *ROMBaseHost; // Base address of Mac ROM (host address space)
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// Mac memory access functions
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#if EMULATED_PPC
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#include "cpu/vm.hpp"
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static inline uint32 ReadMacInt8(uint32 addr) {return vm_read_memory_1(addr);}
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static inline void WriteMacInt8(uint32 addr, uint32 v) {vm_write_memory_1(addr, v);}
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static inline uint32 ReadMacInt16(uint32 addr) {return vm_read_memory_2(addr);}
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static inline void WriteMacInt16(uint32 addr, uint32 v) {vm_write_memory_2(addr, v);}
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static inline uint32 ReadMacInt32(uint32 addr) {return vm_read_memory_4(addr);}
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static inline void WriteMacInt32(uint32 addr, uint32 v) {vm_write_memory_4(addr, v);}
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static inline uint64 ReadMacInt64(uint32 addr) {return vm_read_memory_8(addr);}
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static inline void WriteMacInt64(uint32 addr, uint64 v) {vm_write_memory_8(addr, v);}
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static inline uint32 Host2MacAddr(uint8 *addr) {return vm_do_get_virtual_address(addr);}
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static inline uint8 *Mac2HostAddr(uint32 addr) {return vm_do_get_real_address(addr);}
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static inline void *Mac_memset(uint32 addr, int c, size_t n) {return vm_memset(addr, c, n);}
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static inline void *Mac2Host_memcpy(void *dest, uint32 src, size_t n) {return vm_memcpy(dest, src, n);}
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static inline void *Host2Mac_memcpy(uint32 dest, const void *src, size_t n) {return vm_memcpy(dest, src, n);}
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static inline void *Mac2Mac_memcpy(uint32 dest, uint32 src, size_t n) {return vm_memcpy(dest, src, n);}
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#else
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static inline uint32 ReadMacInt8(uint32 addr) {return *(uint8 *)addr;}
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static inline void WriteMacInt8(uint32 addr, uint32 b) {*(uint8 *)addr = b;}
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static inline uint32 ReadMacInt16(uint32 addr) {return *(uint16 *)addr;}
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static inline uint32 ReadMacInt32(uint32 addr) {return *(uint32 *)addr;}
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static inline uint64 ReadMacInt64(uint32 addr) {return *(uint64 *)addr;}
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static inline void WriteMacInt16(uint32 addr, uint32 w) {*(uint16 *)addr = w;}
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static inline void WriteMacInt32(uint32 addr, uint32 l) {*(uint32 *)addr = l;}
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static inline void WriteMacInt64(uint32 addr, uint64 ll) {*(uint64 *)addr = ll;}
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static inline uint32 Host2MacAddr(uint8 *addr) {return (uint32)addr;}
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static inline uint8 *Mac2HostAddr(uint32 addr) {return (uint8 *)addr;}
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static inline void *Mac_memset(uint32 addr, int c, size_t n) {return memset(Mac2HostAddr(addr), c, n);}
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static inline void *Mac2Host_memcpy(void *dest, uint32 src, size_t n) {return memcpy(dest, Mac2HostAddr(src), n);}
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static inline void *Host2Mac_memcpy(uint32 dest, const void *src, size_t n) {return memcpy(Mac2HostAddr(dest), src, n);}
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static inline void *Mac2Mac_memcpy(uint32 dest, uint32 src, size_t n) {return memcpy(Mac2HostAddr(dest), Mac2HostAddr(src), n);}
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#endif
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/*
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* 680x0 and PPC emulation
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*/
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// 68k procedure helper to write a big endian 16-bit word
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#ifdef WORDS_BIGENDIAN
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#define PW(W) W
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#else
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#define PW(X) ((((X) >> 8) & 0xff) | (((X) & 0xff) << 8))
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#endif
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// PowerPC procedure helper to write a big-endian 32-bit word
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#ifdef WORDS_BIGENDIAN
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#define PL(X) X
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#else
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#define PL(X) \
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((((X) & 0xff000000) >> 24) | (((X) & 0x00ff0000) >> 8) | \
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(((X) & 0x0000ff00) << 8) | (((X) & 0x000000ff) << 24))
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#endif
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struct M68kRegisters;
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extern void Execute68k(uint32, M68kRegisters *r); // Execute 68k subroutine from EMUL_OP routine, must be ended with RTS
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extern void Execute68kTrap(uint16 trap, M68kRegisters *r); // Execute 68k A-Trap from EMUL_OP routine
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#if EMULATED_PPC
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extern void FlushCodeCache(uintptr start, uintptr end); // Invalidate emulator caches
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#endif
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extern void ExecuteNative(int selector); // Execute native code from EMUL_OP routine (real mode switch)
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#endif
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