src/include/thunks.h

/*
 *  thunks.h - Thunks to share data and code with MacOS
 *
 *  SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef THUNKS_H
#define THUNKS_H

#include "cpu_emulation.h"

/*
 *  Native function invocation
 */

enum {
  NATIVE_PATCH_NAME_REGISTRY,
  NATIVE_VIDEO_INSTALL_ACCEL,
  NATIVE_VIDEO_VBL,
  NATIVE_VIDEO_DO_DRIVER_IO,
  NATIVE_ETHER_IRQ,
  NATIVE_ETHER_INIT,
  NATIVE_ETHER_TERM,
  NATIVE_ETHER_OPEN,
  NATIVE_ETHER_CLOSE,
  NATIVE_ETHER_WPUT,
  NATIVE_ETHER_RSRV,
  NATIVE_SERIAL_NOTHING,
  NATIVE_SERIAL_OPEN,
  NATIVE_SERIAL_PRIME_IN,
  NATIVE_SERIAL_PRIME_OUT,
  NATIVE_SERIAL_CONTROL,
  NATIVE_SERIAL_STATUS,
  NATIVE_SERIAL_CLOSE,
  NATIVE_GET_RESOURCE,
  NATIVE_GET_1_RESOURCE,
  NATIVE_GET_IND_RESOURCE,
  NATIVE_GET_1_IND_RESOURCE,
  NATIVE_R_GET_RESOURCE,
  NATIVE_DISABLE_INTERRUPT,
  NATIVE_ENABLE_INTERRUPT,
  NATIVE_MAKE_EXECUTABLE,
  NATIVE_OP_MAX
};

// Initialize the thunks system
extern bool ThunksInit(void);

// Exit the thunks system
extern void ThunksExit(void);

// Return the fake PowerPC opcode to handle specified native code
#if EMULATED_PPC
extern uint32 NativeOpcode(int selector);
#endif

// Return the native function descriptor (TVECT)
extern uint32 NativeTVECT(int selector);

// Return the native function address
extern uint32 NativeFunction(int selector);

// Return the routine descriptor address of the native function
extern uint32 NativeRoutineDescriptor(int selector);


/*
 *  Helpers to share 32-bit addressable data with MacOS
 */

class SheepMem {
        static uint32 align(uint32 size);
protected:
        static uintptr zero_page;
        static uintptr base;
        static uintptr top;
        static const uint32 size = 0x40000; // 256 KB
public:
        static bool Init(void);
        static void Exit(void);
        static uintptr ZeroPage();
        static uintptr Reserve(uint32 size);
        static void Release(uint32 size);
        friend class SheepVar;
};

inline uint32 SheepMem::align(uint32 size)
{
        // Align on 4 bytes boundaries
        return (size + 3) & -4;
}

inline uintptr SheepMem::ZeroPage()
{
  return zero_page;
}

inline uintptr SheepMem::Reserve(uint32 size)
{
        top -= align(size);
        assert(top >= base);
        return top;
}

inline void SheepMem::Release(uint32 size)
{
        top += align(size);
}

class SheepVar
{
        uintptr m_base;
        uint32  m_size;
public:
        SheepVar(uint32 requested_size);
        ~SheepVar() { SheepMem::Release(m_size); }
        uintptr addr() const { return m_base; }
        void *ptr() const { return (void *)addr(); }
};

inline SheepVar::SheepVar(uint32 requested_size)
{
        m_size = SheepMem::align(requested_size);
        m_base = SheepMem::Reserve(m_size);
}

// TODO: optimize for 32-bit platforms

template< int size >
struct SheepArray : public SheepVar
{
        SheepArray() : SheepVar(size) { }
        uint8 *ptr() const { return (uint8 *)addr(); }
};

struct SheepVar32 : public SheepVar
{
        SheepVar32() : SheepVar(4) { }
        SheepVar32(uint32 value) : SheepVar(4) { set_value(value); }
        uint32 value() const { return ReadMacInt32(addr()); }
        void set_value(uint32 v) { WriteMacInt32(addr(), v); }
        uint32 *ptr() const { return (uint32 *)addr(); }
};

struct SheepString : public SheepVar
{
        SheepString(const char *str) : SheepVar(strlen(str) + 1)
                { if (str) strcpy((char *)addr(), str); else WriteMacInt8(addr(), 0); }
        char *value() const
                { return (char *)addr(); }
        char *ptr() const
                { return (char *)addr(); }
};

#endif
Revision:	1.3
Committed:	2004-01-07T18:24:42Z (20 years, 8 months ago) by gbeauche
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+7 -1 lines
Log Message:	Also cache native routine descriptor instead of recreating them at each invokation to ExecuteNative().
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* thunks.h - Thunks to share data and code with MacOS
3			*
4			* SheepShaver (C) 1997-2002 Christian Bauer and Marc Hellwig
5			*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#ifndef THUNKS_H
22			#define THUNKS_H
23
24			#include "cpu_emulation.h"
25
26			/*
27			* Native function invocation
28			*/
29
30			enum {
31			NATIVE_PATCH_NAME_REGISTRY,
32			NATIVE_VIDEO_INSTALL_ACCEL,
33			NATIVE_VIDEO_VBL,
34			NATIVE_VIDEO_DO_DRIVER_IO,
35			NATIVE_ETHER_IRQ,
36			NATIVE_ETHER_INIT,
37			NATIVE_ETHER_TERM,
38			NATIVE_ETHER_OPEN,
39			NATIVE_ETHER_CLOSE,
40			NATIVE_ETHER_WPUT,
41			NATIVE_ETHER_RSRV,
42			NATIVE_SERIAL_NOTHING,
43			NATIVE_SERIAL_OPEN,
44			NATIVE_SERIAL_PRIME_IN,
45			NATIVE_SERIAL_PRIME_OUT,
46			NATIVE_SERIAL_CONTROL,
47			NATIVE_SERIAL_STATUS,
48			NATIVE_SERIAL_CLOSE,
49			NATIVE_GET_RESOURCE,
50			NATIVE_GET_1_RESOURCE,
51			NATIVE_GET_IND_RESOURCE,
52			NATIVE_GET_1_IND_RESOURCE,
53			NATIVE_R_GET_RESOURCE,
54			NATIVE_DISABLE_INTERRUPT,
55			NATIVE_ENABLE_INTERRUPT,
56			NATIVE_MAKE_EXECUTABLE,
57			NATIVE_OP_MAX
58			};
59
60			// Initialize the thunks system
61			extern bool ThunksInit(void);
62
63	gbeauche	1.3	// Exit the thunks system
64			extern void ThunksExit(void);
65
66	gbeauche	1.1	// Return the fake PowerPC opcode to handle specified native code
67			#if EMULATED_PPC
68			extern uint32 NativeOpcode(int selector);
69			#endif
70
71			// Return the native function descriptor (TVECT)
72			extern uint32 NativeTVECT(int selector);
73
74			// Return the native function address
75			extern uint32 NativeFunction(int selector);
76
77	gbeauche	1.3	// Return the routine descriptor address of the native function
78			extern uint32 NativeRoutineDescriptor(int selector);
79
80	gbeauche	1.1
81			/*
82			* Helpers to share 32-bit addressable data with MacOS
83			*/
84
85			class SheepMem {
86			static uint32 align(uint32 size);
87			protected:
88	gbeauche	1.2	static uintptr zero_page;
89	gbeauche	1.1	static uintptr base;
90			static uintptr top;
91	gbeauche	1.3	static const uint32 size = 0x40000; // 256 KB
92	gbeauche	1.1	public:
93			static bool Init(void);
94			static void Exit(void);
95	gbeauche	1.2	static uintptr ZeroPage();
96	gbeauche	1.1	static uintptr Reserve(uint32 size);
97			static void Release(uint32 size);
98			friend class SheepVar;
99			};
100
101			inline uint32 SheepMem::align(uint32 size)
102			{
103			// Align on 4 bytes boundaries
104			return (size + 3) & -4;
105	gbeauche	1.2	}
106
107			inline uintptr SheepMem::ZeroPage()
108			{
109			return zero_page;
110	gbeauche	1.1	}
111
112			inline uintptr SheepMem::Reserve(uint32 size)
113			{
114			top -= align(size);
115			assert(top >= base);
116			return top;
117			}
118
119			inline void SheepMem::Release(uint32 size)
120			{
121			top += align(size);
122			}
123
124			class SheepVar
125			{
126			uintptr m_base;
127			uint32 m_size;
128			public:
129			SheepVar(uint32 requested_size);
130			~SheepVar() { SheepMem::Release(m_size); }
131			uintptr addr() const { return m_base; }
132			void ptr() const { return (void )addr(); }
133			};
134
135			inline SheepVar::SheepVar(uint32 requested_size)
136			{
137			m_size = SheepMem::align(requested_size);
138			m_base = SheepMem::Reserve(m_size);
139			}
140
141			// TODO: optimize for 32-bit platforms
142
143			template< int size >
144			struct SheepArray : public SheepVar
145			{
146			SheepArray() : SheepVar(size) { }
147			uint8 ptr() const { return (uint8 )addr(); }
148			};
149
150			struct SheepVar32 : public SheepVar
151			{
152			SheepVar32() : SheepVar(4) { }
153			SheepVar32(uint32 value) : SheepVar(4) { set_value(value); }
154			uint32 value() const { return ReadMacInt32(addr()); }
155			void set_value(uint32 v) { WriteMacInt32(addr(), v); }
156			uint32 ptr() const { return (uint32 )addr(); }
157			};
158
159			struct SheepString : public SheepVar
160			{
161			SheepString(const char *str) : SheepVar(strlen(str) + 1)
162			{ if (str) strcpy((char *)addr(), str); else WriteMacInt8(addr(), 0); }
163			char *value() const
164			{ return (char *)addr(); }
165			char *ptr() const
166			{ return (char *)addr(); }
167			};
168
169			#endif