src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-1999 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;                      // RAM base (Mac address space)
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

// 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;
#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)
{
}


/*
 *  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;
}


/*
 *  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:	1.1
Committed:	1999-10-03T14:16:26Z (25 years, 1 month ago) by cebix
Branch:	MAIN
Branch point for:	cebix
Log Message:	Initial revision
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4			* Basilisk II (C) 1997-1999 Christian Bauer
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			#include "sysdeps.h"
22			#include "cpu_emulation.h"
23			#include "main.h"
24			#include "emul_op.h"
25			#include "rom_patches.h"
26			#include "m68k.h"
27			#include "memory.h"
28			#include "readcpu.h"
29			#include "newcpu.h"
30			#include "compiler.h"
31
32
33			// RAM and ROM pointers
34			uint32 RAMBaseMac; // RAM base (Mac address space)
35			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			// From newcpu.cpp
49			extern int quit_program;
50
51
52			/*
53			* Initialize 680x0 emulation, CheckROM() must have been called first
54			*/
55
56			bool Init680x0(void)
57			{
58			#if REAL_ADDRESSING
59			// Mac address space = host address space
60			RAMBaseMac = (uint32)RAMBaseHost;
61			ROMBaseMac = (uint32)ROMBaseHost;
62			#else
63			// Initialize UAE memory banks
64			RAMBaseMac = 0;
65			switch (ROMVersion) {
66			case ROM_VERSION_64K:
67			case ROM_VERSION_PLUS:
68			case ROM_VERSION_CLASSIC:
69			ROMBaseMac = 0x00400000;
70			break;
71			case ROM_VERSION_II:
72			ROMBaseMac = 0x00a00000;
73			break;
74			case ROM_VERSION_32:
75			ROMBaseMac = 0x40800000;
76			break;
77			default:
78			return false;
79			}
80			memory_init();
81			#endif
82
83			init_m68k();
84			return true;
85			}
86
87
88			/*
89			* Deinitialize 680x0 emulation
90			*/
91
92			void Exit680x0(void)
93			{
94			}
95
96
97			/*
98			* Reset and start 680x0 emulation (doesn't return)
99			*/
100
101			void Start680x0(void)
102			{
103			m68k_reset();
104			m68k_go(true);
105			}
106
107
108			/*
109			* Trigger interrupt
110			*/
111
112			void TriggerInterrupt(void)
113			{
114			regs.spcflags \|= SPCFLAG_INT;
115			}
116
117
118			/*
119			* Get 68k interrupt level
120			*/
121
122			int intlev(void)
123			{
124			return InterruptFlags ? 1 : 0;
125			}
126
127
128			/*
129			* Execute MacOS 68k trap
130			* r->a[7] and r->sr are unused!
131			*/
132
133			void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
134			{
135			int i;
136
137			// Save old PC
138			uaecptr oldpc = m68k_getpc();
139
140			// Set registers
141			for (i=0; i<8; i++)
142			m68k_dreg(regs, i) = r->d[i];
143			for (i=0; i<7; i++)
144			m68k_areg(regs, i) = r->a[i];
145
146			// Push trap and EXEC_RETURN on stack
147			m68k_areg(regs, 7) -= 2;
148			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
149			m68k_areg(regs, 7) -= 2;
150			put_word(m68k_areg(regs, 7), trap);
151
152			// Execute trap
153			m68k_setpc(m68k_areg(regs, 7));
154			fill_prefetch_0();
155			quit_program = 0;
156			m68k_go(true);
157
158			// Clean up stack
159			m68k_areg(regs, 7) += 4;
160
161			// Restore old PC
162			m68k_setpc(oldpc);
163			fill_prefetch_0();
164
165			// Get registers
166			for (i=0; i<8; i++)
167			r->d[i] = m68k_dreg(regs, i);
168			for (i=0; i<7; i++)
169			r->a[i] = m68k_areg(regs, i);
170			quit_program = 0;
171			}
172
173
174			/*
175			* Execute 68k subroutine
176			* The executed routine must reside in UAE memory!
177			* r->a[7] and r->sr are unused!
178			*/
179
180			void Execute68k(uint32 addr, struct M68kRegisters *r)
181			{
182			int i;
183
184			// Save old PC
185			uaecptr oldpc = m68k_getpc();
186
187			// Set registers
188			for (i=0; i<8; i++)
189			m68k_dreg(regs, i) = r->d[i];
190			for (i=0; i<7; i++)
191			m68k_areg(regs, i) = r->a[i];
192
193			// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
194			m68k_areg(regs, 7) -= 2;
195			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
196			m68k_areg(regs, 7) -= 4;
197			put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
198
199			// Execute routine
200			m68k_setpc(addr);
201			fill_prefetch_0();
202			quit_program = 0;
203			m68k_go(true);
204
205			// Clean up stack
206			m68k_areg(regs, 7) += 2;
207
208			// Restore old PC
209			m68k_setpc(oldpc);
210			fill_prefetch_0();
211
212			// Get registers
213			for (i=0; i<8; i++)
214			r->d[i] = m68k_dreg(regs, i);
215			for (i=0; i<7; i++)
216			r->a[i] = m68k_areg(regs, i);
217			quit_program = 0;
218			}