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:	1.1.1.1 (vendor branch)
Committed:	1999-10-03T14:16:26Z (24 years, 8 months ago) by cebix
Branch:	cebix
CVS Tags:	release-0_7-2, snapshot-21101999, start, snapshot-02111999
Changes since 1.1:	+0 -0 lines
Log Message:	Imported sources
#	Content
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	}