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/* |
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* thunks.h - Thunks to share data and code with MacOS |
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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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|
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#ifndef THUNKS_H |
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#define THUNKS_H |
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|
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#include "cpu_emulation.h" |
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|
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/* |
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* Native function invocation |
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*/ |
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|
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enum { |
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NATIVE_PATCH_NAME_REGISTRY, |
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NATIVE_VIDEO_INSTALL_ACCEL, |
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NATIVE_VIDEO_VBL, |
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NATIVE_VIDEO_DO_DRIVER_IO, |
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NATIVE_ETHER_IRQ, |
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NATIVE_ETHER_INIT, |
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NATIVE_ETHER_TERM, |
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NATIVE_ETHER_OPEN, |
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NATIVE_ETHER_CLOSE, |
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NATIVE_ETHER_WPUT, |
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NATIVE_ETHER_RSRV, |
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NATIVE_SERIAL_NOTHING, |
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NATIVE_SERIAL_OPEN, |
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NATIVE_SERIAL_PRIME_IN, |
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NATIVE_SERIAL_PRIME_OUT, |
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NATIVE_SERIAL_CONTROL, |
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NATIVE_SERIAL_STATUS, |
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NATIVE_SERIAL_CLOSE, |
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NATIVE_GET_RESOURCE, |
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NATIVE_GET_1_RESOURCE, |
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NATIVE_GET_IND_RESOURCE, |
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NATIVE_GET_1_IND_RESOURCE, |
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NATIVE_R_GET_RESOURCE, |
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NATIVE_MAKE_EXECUTABLE, |
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NATIVE_CHECK_LOAD_INVOC, |
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NATIVE_SYNC_HOOK, |
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NATIVE_BITBLT_HOOK, |
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NATIVE_FILLRECT_HOOK, |
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NATIVE_BITBLT, |
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NATIVE_INVRECT, |
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NATIVE_FILLRECT, |
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NATIVE_OP_MAX |
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}; |
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|
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// Initialize the thunks system |
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extern bool ThunksInit(void); |
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|
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// Exit the thunks system |
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extern void ThunksExit(void); |
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|
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// Return the fake PowerPC opcode to handle specified native code |
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#if EMULATED_PPC |
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extern uint32 NativeOpcode(int selector); |
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#endif |
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|
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// Return the native function descriptor (TVECT) |
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extern uint32 NativeTVECT(int selector); |
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|
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// Return the native function address |
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extern uint32 NativeFunction(int selector); |
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|
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// Return the routine descriptor address of the native function |
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extern uint32 NativeRoutineDescriptor(int selector); |
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|
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|
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/* |
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* Helpers to share 32-bit addressable data with MacOS |
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* |
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* There are two distinct allocatable regions: |
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* |
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* - The Data region is used to share data between MacOS and |
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* SheepShaver. This is stack-like allocation since it is |
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* meant to only hold temporary data which dies at the end |
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* of the current function scope. |
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* |
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* - The Procedure region is used to hold permanent M68K or |
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* PowerPC code to assist native routine implementations. |
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* |
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* - The Procedure region grows up whereas the Data region |
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* grows down. They may intersect into the ZeroPage, which |
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* is a read-only page with all bits set to zero. In practise, |
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* the intersection is unlikely since the Procedure region is |
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* static and the Data region is meant to be small (< 256 KB). |
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*/ |
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|
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class SheepMem { |
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static uint32 align(uint32 size); |
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protected: |
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static uint32 page_size; |
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static uintptr zero_page; |
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static uintptr base; |
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static uintptr data; |
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static uintptr proc; |
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static const uint32 size = 0x80000; // 512 KB |
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public: |
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static bool Init(void); |
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static void Exit(void); |
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static uint32 PageSize(); |
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static uint32 ZeroPage(); |
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static uint32 Reserve(uint32 size); |
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static void Release(uint32 size); |
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static uint32 ReserveProc(uint32 size); |
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friend class SheepVar; |
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}; |
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|
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inline uint32 SheepMem::align(uint32 size) |
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{ |
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// Align on 4 bytes boundaries |
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return (size + 3) & -4; |
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} |
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|
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inline uint32 SheepMem::PageSize() |
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{ |
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return page_size; |
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} |
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|
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inline uint32 SheepMem::ZeroPage() |
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{ |
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return zero_page; |
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} |
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|
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inline uint32 SheepMem::Reserve(uint32 size) |
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{ |
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data -= align(size); |
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assert(data >= proc); |
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return data; |
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} |
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|
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inline void SheepMem::Release(uint32 size) |
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{ |
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data += align(size); |
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} |
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|
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inline uint32 SheepMem::ReserveProc(uint32 size) |
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{ |
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uint32 mproc = proc; |
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proc += align(size); |
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assert(proc < data); |
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return mproc; |
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} |
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|
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static inline uint32 SheepProc(const uint8 *proc, uint32 proc_size) |
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{ |
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uint32 mac_proc = SheepMem::ReserveProc(proc_size); |
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Host2Mac_memcpy(mac_proc, proc, proc_size); |
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return mac_proc; |
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} |
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|
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#define BUILD_SHEEPSHAVER_PROCEDURE(PROC) \ |
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static uint32 PROC = 0; \ |
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if (PROC == 0) \ |
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PROC = SheepProc(PROC##_template, sizeof(PROC##_template)) |
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|
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class SheepVar |
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{ |
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uint32 m_base; |
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uint32 m_size; |
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public: |
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SheepVar(uint32 requested_size); |
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~SheepVar() { SheepMem::Release(m_size); } |
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uint32 addr() const { return m_base; } |
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}; |
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|
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inline SheepVar::SheepVar(uint32 requested_size) |
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{ |
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m_size = SheepMem::align(requested_size); |
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m_base = SheepMem::Reserve(m_size); |
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} |
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|
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// TODO: optimize for 32-bit platforms |
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|
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template< int requested_size > |
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struct SheepArray : public SheepVar |
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{ |
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SheepArray() : SheepVar(requested_size) { } |
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}; |
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|
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struct SheepVar32 : public SheepVar |
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{ |
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SheepVar32() : SheepVar(4) { } |
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SheepVar32(uint32 value) : SheepVar(4) { set_value(value); } |
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uint32 value() const { return ReadMacInt32(addr()); } |
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void set_value(uint32 v) { WriteMacInt32(addr(), v); } |
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}; |
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|
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struct SheepString : public SheepVar |
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{ |
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SheepString(const char *str) : SheepVar(strlen(str) + 1) |
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{ if (str) strcpy(value(), str); else WriteMacInt8(addr(), 0); } |
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char *value() const |
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{ return (char *)Mac2HostAddr(addr()); } |
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}; |
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|
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#endif |
