src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-2000 Christian Bauer
 *
 *  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
 */

#include "sysdeps.h"

#include "cpu_emulation.h"
#include "main.h"
#include "emul_op.h"
#include "rom_patches.h"
#include "m68k.h"
#include "memory.h"
#include "readcpu.h"
#include "newcpu.h"
#include "compiler.h"


// RAM and ROM pointers
uint32 RAMBaseMac = 0;          // RAM base (Mac address space) gb-- init is important
uint8 *RAMBaseHost;                     // RAM base (host address space)
uint32 RAMSize;                         // Size of RAM
uint32 ROMBaseMac;                      // ROM base (Mac address space)
uint8 *ROMBaseHost;                     // ROM base (host address space)
uint32 ROMSize;                         // Size of ROM

#if !REAL_ADDRESSING
// Mac frame buffer
uint8 *MacFrameBaseHost;        // Frame buffer base (host address space)
uint32 MacFrameSize;            // Size of frame buffer
int MacFrameLayout;                     // Frame buffer layout
#endif

#if DIRECT_ADDRESSING
uintptr MEMBaseDiff;            // Global offset between a Mac address and its Host equivalent
#endif

// From newcpu.cpp
extern int quit_program;


/*
 *  Initialize 680x0 emulation, CheckROM() must have been called first
 */

bool Init680x0(void)
{
#if REAL_ADDRESSING
        // Mac address space = host address space
        RAMBaseMac = (uint32)RAMBaseHost;
        ROMBaseMac = (uint32)ROMBaseHost;
#elif DIRECT_ADDRESSING
        InitMEMBaseDiff(RAMBaseHost, RAMBaseMac);
#else
        // Initialize UAE memory banks
        RAMBaseMac = 0;
        switch (ROMVersion) {
                case ROM_VERSION_64K:
                case ROM_VERSION_PLUS:
                case ROM_VERSION_CLASSIC:
                        ROMBaseMac = 0x00400000;
                        break;
                case ROM_VERSION_II:
                        ROMBaseMac = 0x00a00000;
                        break;
                case ROM_VERSION_32:
                        ROMBaseMac = 0x40800000;
                        break;
                default:
                        return false;
        }
        memory_init();
#endif

        init_m68k();
#ifdef USE_COMPILER
        compiler_init();
#endif
        return true;
}


/*
 *  Deinitialize 680x0 emulation
 */

void Exit680x0(void)
{
        exit_m68k();
}


/*
 *  Reset and start 680x0 emulation (doesn't return)
 */

void Start680x0(void)
{
        m68k_reset();
        m68k_go(true);
}


/*
 *  Trigger interrupt
 */

void TriggerInterrupt(void)
{
        regs.spcflags |= SPCFLAG_INT;
}

void TriggerNMI(void)
{
        //!! not implemented yet
}


/*
 *  Get 68k interrupt level
 */

int intlev(void)
{
        return InterruptFlags ? 1 : 0;
}


/*
 *  Execute MacOS 68k trap
 *  r->a[7] and r->sr are unused!
 */

void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
{
        int i;

        // Save old PC
        uaecptr oldpc = m68k_getpc();

        // Set registers
        for (i=0; i<8; i++)
                m68k_dreg(regs, i) = r->d[i];
        for (i=0; i<7; i++)
                m68k_areg(regs, i) = r->a[i];

        // Push trap and EXEC_RETURN on stack
        m68k_areg(regs, 7) -= 2;
        put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
        m68k_areg(regs, 7) -= 2;
        put_word(m68k_areg(regs, 7), trap);

        // Execute trap
        m68k_setpc(m68k_areg(regs, 7));
        fill_prefetch_0();
        quit_program = 0;
        m68k_go(true);

        // Clean up stack
        m68k_areg(regs, 7) += 4;

        // Restore old PC
        m68k_setpc(oldpc);
        fill_prefetch_0();

        // Get registers
        for (i=0; i<8; i++)
                r->d[i] = m68k_dreg(regs, i);
        for (i=0; i<7; i++)
                r->a[i] = m68k_areg(regs, i);
        quit_program = 0;
}


/*
 *  Execute 68k subroutine
 *  The executed routine must reside in UAE memory!
 *  r->a[7] and r->sr are unused!
 */

void Execute68k(uint32 addr, struct M68kRegisters *r)
{
        int i;

        // Save old PC
        uaecptr oldpc = m68k_getpc();

        // Set registers
        for (i=0; i<8; i++)
                m68k_dreg(regs, i) = r->d[i];
        for (i=0; i<7; i++)
                m68k_areg(regs, i) = r->a[i];

        // Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
        m68k_areg(regs, 7) -= 2;
        put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
        m68k_areg(regs, 7) -= 4;
        put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);

        // Execute routine
        m68k_setpc(addr);
        fill_prefetch_0();
        quit_program = 0;
        m68k_go(true);

        // Clean up stack
        m68k_areg(regs, 7) += 2;

        // Restore old PC
        m68k_setpc(oldpc);
        fill_prefetch_0();

        // Get registers
        for (i=0; i<8; i++)
                r->d[i] = m68k_dreg(regs, i);
        for (i=0; i<7; i++)
                r->a[i] = m68k_areg(regs, i);
        quit_program = 0;
}
Revision:	1.7
Committed:	2000-09-22T17:18:15Z (24 years, 2 months ago) by gbeauche
Branch:	MAIN
Changes since 1.6:	+7 -1 lines
Log Message:	- added memory initilization for direct addressing (MEMBaseDiff)
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4	cebix	1.3	* Basilisk II (C) 1997-2000 Christian Bauer
5	cebix	1.1	*
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			#include "sysdeps.h"
22	cebix	1.4
23	cebix	1.1	#include "cpu_emulation.h"
24			#include "main.h"
25			#include "emul_op.h"
26			#include "rom_patches.h"
27			#include "m68k.h"
28			#include "memory.h"
29			#include "readcpu.h"
30			#include "newcpu.h"
31			#include "compiler.h"
32
33
34			// RAM and ROM pointers
35	gbeauche	1.7	uint32 RAMBaseMac = 0; // RAM base (Mac address space) gb-- init is important
36	cebix	1.1	uint8 *RAMBaseHost; // RAM base (host address space)
37			uint32 RAMSize; // Size of RAM
38			uint32 ROMBaseMac; // ROM base (Mac address space)
39			uint8 *ROMBaseHost; // ROM base (host address space)
40			uint32 ROMSize; // Size of ROM
41
42			#if !REAL_ADDRESSING
43			// Mac frame buffer
44			uint8 *MacFrameBaseHost; // Frame buffer base (host address space)
45			uint32 MacFrameSize; // Size of frame buffer
46			int MacFrameLayout; // Frame buffer layout
47			#endif
48
49	gbeauche	1.7	#if DIRECT_ADDRESSING
50			uintptr MEMBaseDiff; // Global offset between a Mac address and its Host equivalent
51			#endif
52
53	cebix	1.1	// From newcpu.cpp
54			extern int quit_program;
55
56
57			/*
58			* Initialize 680x0 emulation, CheckROM() must have been called first
59			*/
60
61			bool Init680x0(void)
62			{
63			#if REAL_ADDRESSING
64			// Mac address space = host address space
65			RAMBaseMac = (uint32)RAMBaseHost;
66			ROMBaseMac = (uint32)ROMBaseHost;
67	gbeauche	1.7	#elif DIRECT_ADDRESSING
68			InitMEMBaseDiff(RAMBaseHost, RAMBaseMac);
69	cebix	1.1	#else
70			// Initialize UAE memory banks
71			RAMBaseMac = 0;
72			switch (ROMVersion) {
73			case ROM_VERSION_64K:
74			case ROM_VERSION_PLUS:
75			case ROM_VERSION_CLASSIC:
76			ROMBaseMac = 0x00400000;
77			break;
78			case ROM_VERSION_II:
79			ROMBaseMac = 0x00a00000;
80			break;
81			case ROM_VERSION_32:
82			ROMBaseMac = 0x40800000;
83			break;
84			default:
85			return false;
86			}
87			memory_init();
88			#endif
89
90			init_m68k();
91	cebix	1.4	#ifdef USE_COMPILER
92	cebix	1.2	compiler_init();
93	cebix	1.4	#endif
94	cebix	1.1	return true;
95			}
96
97
98			/*
99			* Deinitialize 680x0 emulation
100			*/
101
102			void Exit680x0(void)
103			{
104	gbeauche	1.6	exit_m68k();
105	cebix	1.1	}
106
107
108			/*
109			* Reset and start 680x0 emulation (doesn't return)
110			*/
111
112			void Start680x0(void)
113			{
114			m68k_reset();
115			m68k_go(true);
116			}
117
118
119			/*
120			* Trigger interrupt
121			*/
122
123			void TriggerInterrupt(void)
124			{
125			regs.spcflags \|= SPCFLAG_INT;
126			}
127
128	cebix	1.5	void TriggerNMI(void)
129			{
130			//!! not implemented yet
131			}
132
133	cebix	1.1
134			/*
135			* Get 68k interrupt level
136			*/
137
138			int intlev(void)
139			{
140			return InterruptFlags ? 1 : 0;
141			}
142
143
144			/*
145			* Execute MacOS 68k trap
146			* r->a[7] and r->sr are unused!
147			*/
148
149			void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
150			{
151			int i;
152
153			// Save old PC
154			uaecptr oldpc = m68k_getpc();
155
156			// Set registers
157			for (i=0; i<8; i++)
158			m68k_dreg(regs, i) = r->d[i];
159			for (i=0; i<7; i++)
160			m68k_areg(regs, i) = r->a[i];
161
162			// Push trap and EXEC_RETURN on stack
163			m68k_areg(regs, 7) -= 2;
164			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
165			m68k_areg(regs, 7) -= 2;
166			put_word(m68k_areg(regs, 7), trap);
167
168			// Execute trap
169			m68k_setpc(m68k_areg(regs, 7));
170			fill_prefetch_0();
171			quit_program = 0;
172			m68k_go(true);
173
174			// Clean up stack
175			m68k_areg(regs, 7) += 4;
176
177			// Restore old PC
178			m68k_setpc(oldpc);
179			fill_prefetch_0();
180
181			// Get registers
182			for (i=0; i<8; i++)
183			r->d[i] = m68k_dreg(regs, i);
184			for (i=0; i<7; i++)
185			r->a[i] = m68k_areg(regs, i);
186			quit_program = 0;
187			}
188
189
190			/*
191			* Execute 68k subroutine
192			* The executed routine must reside in UAE memory!
193			* r->a[7] and r->sr are unused!
194			*/
195
196			void Execute68k(uint32 addr, struct M68kRegisters *r)
197			{
198			int i;
199
200			// Save old PC
201			uaecptr oldpc = m68k_getpc();
202
203			// Set registers
204			for (i=0; i<8; i++)
205			m68k_dreg(regs, i) = r->d[i];
206			for (i=0; i<7; i++)
207			m68k_areg(regs, i) = r->a[i];
208
209			// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
210			m68k_areg(regs, 7) -= 2;
211			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
212			m68k_areg(regs, 7) -= 4;
213			put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
214
215			// Execute routine
216			m68k_setpc(addr);
217			fill_prefetch_0();
218			quit_program = 0;
219			m68k_go(true);
220
221			// Clean up stack
222			m68k_areg(regs, 7) += 2;
223
224			// Restore old PC
225			m68k_setpc(oldpc);
226			fill_prefetch_0();
227
228			// Get registers
229			for (i=0; i<8; i++)
230			r->d[i] = m68k_dreg(regs, i);
231			for (i=0; i<7; i++)
232			r->a[i] = m68k_areg(regs, i);
233			quit_program = 0;
234			}