src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-2001 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"


// 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();
        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:	1.9
Committed:	2001-03-20T17:35:45Z (23 years, 2 months ago) by gbeauche
Branch:	MAIN
CVS Tags:	snapshot-29052001, release-0_9-1
Changes since 1.8:	+0 -4 lines
Log Message:	- removed old JIT compiler, its related support functions and files (compiler.{h,cpp})
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4	cebix	1.8	* Basilisk II (C) 1997-2001 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
32
33			// RAM and ROM pointers
34	gbeauche	1.7	uint32 RAMBaseMac = 0; // RAM base (Mac address space) gb-- init is important
35	cebix	1.1	uint8 *RAMBaseHost; // RAM base (host address space)
36			uint32 RAMSize; // Size of RAM
37			uint32 ROMBaseMac; // ROM base (Mac address space)
38			uint8 *ROMBaseHost; // ROM base (host address space)
39			uint32 ROMSize; // Size of ROM
40
41			#if !REAL_ADDRESSING
42			// Mac frame buffer
43			uint8 *MacFrameBaseHost; // Frame buffer base (host address space)
44			uint32 MacFrameSize; // Size of frame buffer
45			int MacFrameLayout; // Frame buffer layout
46			#endif
47
48	gbeauche	1.7	#if DIRECT_ADDRESSING
49			uintptr MEMBaseDiff; // Global offset between a Mac address and its Host equivalent
50			#endif
51
52	cebix	1.1	// From newcpu.cpp
53			extern int quit_program;
54
55
56			/*
57			* Initialize 680x0 emulation, CheckROM() must have been called first
58			*/
59
60			bool Init680x0(void)
61			{
62			#if REAL_ADDRESSING
63			// Mac address space = host address space
64			RAMBaseMac = (uint32)RAMBaseHost;
65			ROMBaseMac = (uint32)ROMBaseHost;
66	gbeauche	1.7	#elif DIRECT_ADDRESSING
67			InitMEMBaseDiff(RAMBaseHost, RAMBaseMac);
68	cebix	1.1	#else
69			// Initialize UAE memory banks
70			RAMBaseMac = 0;
71			switch (ROMVersion) {
72			case ROM_VERSION_64K:
73			case ROM_VERSION_PLUS:
74			case ROM_VERSION_CLASSIC:
75			ROMBaseMac = 0x00400000;
76			break;
77			case ROM_VERSION_II:
78			ROMBaseMac = 0x00a00000;
79			break;
80			case ROM_VERSION_32:
81			ROMBaseMac = 0x40800000;
82			break;
83			default:
84			return false;
85			}
86			memory_init();
87			#endif
88
89			init_m68k();
90			return true;
91			}
92
93
94			/*
95			* Deinitialize 680x0 emulation
96			*/
97
98			void Exit680x0(void)
99			{
100	gbeauche	1.6	exit_m68k();
101	cebix	1.1	}
102
103
104			/*
105			* Reset and start 680x0 emulation (doesn't return)
106			*/
107
108			void Start680x0(void)
109			{
110			m68k_reset();
111			m68k_go(true);
112			}
113
114
115			/*
116			* Trigger interrupt
117			*/
118
119			void TriggerInterrupt(void)
120			{
121			regs.spcflags \|= SPCFLAG_INT;
122			}
123
124	cebix	1.5	void TriggerNMI(void)
125			{
126			//!! not implemented yet
127			}
128
129	cebix	1.1
130			/*
131			* Get 68k interrupt level
132			*/
133
134			int intlev(void)
135			{
136			return InterruptFlags ? 1 : 0;
137			}
138
139
140			/*
141			* Execute MacOS 68k trap
142			* r->a[7] and r->sr are unused!
143			*/
144
145			void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
146			{
147			int i;
148
149			// Save old PC
150			uaecptr oldpc = m68k_getpc();
151
152			// Set registers
153			for (i=0; i<8; i++)
154			m68k_dreg(regs, i) = r->d[i];
155			for (i=0; i<7; i++)
156			m68k_areg(regs, i) = r->a[i];
157
158			// Push trap and EXEC_RETURN on stack
159			m68k_areg(regs, 7) -= 2;
160			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
161			m68k_areg(regs, 7) -= 2;
162			put_word(m68k_areg(regs, 7), trap);
163
164			// Execute trap
165			m68k_setpc(m68k_areg(regs, 7));
166			fill_prefetch_0();
167			quit_program = 0;
168			m68k_go(true);
169
170			// Clean up stack
171			m68k_areg(regs, 7) += 4;
172
173			// Restore old PC
174			m68k_setpc(oldpc);
175			fill_prefetch_0();
176
177			// Get registers
178			for (i=0; i<8; i++)
179			r->d[i] = m68k_dreg(regs, i);
180			for (i=0; i<7; i++)
181			r->a[i] = m68k_areg(regs, i);
182			quit_program = 0;
183			}
184
185
186			/*
187			* Execute 68k subroutine
188			* The executed routine must reside in UAE memory!
189			* r->a[7] and r->sr are unused!
190			*/
191
192			void Execute68k(uint32 addr, struct M68kRegisters *r)
193			{
194			int i;
195
196			// Save old PC
197			uaecptr oldpc = m68k_getpc();
198
199			// Set registers
200			for (i=0; i<8; i++)
201			m68k_dreg(regs, i) = r->d[i];
202			for (i=0; i<7; i++)
203			m68k_areg(regs, i) = r->a[i];
204
205			// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
206			m68k_areg(regs, 7) -= 2;
207			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
208			m68k_areg(regs, 7) -= 4;
209			put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
210
211			// Execute routine
212			m68k_setpc(addr);
213			fill_prefetch_0();
214			quit_program = 0;
215			m68k_go(true);
216
217			// Clean up stack
218			m68k_areg(regs, 7) += 2;
219
220			// Restore old PC
221			m68k_setpc(oldpc);
222			fill_prefetch_0();
223
224			// Get registers
225			for (i=0; i<8; i++)
226			r->d[i] = m68k_dreg(regs, i);
227			for (i=0; i<7; i++)
228			r->a[i] = m68k_areg(regs, i);
229			quit_program = 0;
230			}