74 lines
3.7 KiB
C
74 lines
3.7 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) 1997-2002 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 uint32 ROM_BASE = 0x40800000; // Base address of ROM
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const uint32 ROM_SIZE = 0x00400000; // Size of ROM file
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const uint32 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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// 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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// Mac memory access functions
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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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#ifdef __i386__
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static inline uint32 ReadMacInt16(uint32 addr) {uint32 retval; __asm__ ("movzwl %w1,%k0\n\tshll $16,%k0\n\tbswapl %k0\n" : "=&r" (retval) : "m" (*(uint16 *)addr) : "cc"); return retval;}
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static inline uint32 ReadMacInt32(uint32 addr) {uint32 retval; __asm__ ("bswap %0" : "=r" (retval) : "0" (*(uint32 *)addr) : "cc"); return retval;}
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static inline uint64 ReadMacInt64(uint32 addr) {return ((uint64)ReadMacInt32(addr) << 32) | ReadMacInt32(addr + 4);}
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static inline void WriteMacInt16(uint32 addr, uint32 w) {__asm__ ("bswapl %0" : "=&r" (w) : "0" (w << 16) : "cc"); *(uint16 *)addr = w;}
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static inline void WriteMacInt32(uint32 addr, uint32 l) {__asm__ ("bswap %0" : "=r" (l) : "0" (l) : "cc"); *(uint32 *)addr = l;}
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static inline void WriteMacInt64(uint32 addr, uint64 ll) {WriteMacInt32(addr, ll >> 32); WriteMacInt32(addr, ll);}
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#else
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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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#endif
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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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/*
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* 680x0 and PPC emulation
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*/
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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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extern void ExecutePPC(void (*func)()); // Execute PPC code from EMUL_OP routine (real mode switch)
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#endif
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