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();
        compiler_init();
        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:	1.2
Committed:	1999-11-03T10:56:33Z (24 years, 8 months ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-22121999, release-0_8-1
Changes since 1.1:	+1 -0 lines
Log Message:	- imported UAE CPU 0.8.10 changes - new utility functions Mac_memset, Mac2Host_memcpy, Host2Mac_memcpu and Mac2Mac_memcpy - extfs.cpp: fixed bug in fs_rename() and fs_cat_move() (auxiliary IOParam block was not in Mac address space) - some provisions for using UAE CPU compiler (doesn't work yet)
#	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	compiler_init();
85	return true;
86	}
87
88
89	/*
90	* Deinitialize 680x0 emulation
91	*/
92
93	void Exit680x0(void)
94	{
95	}
96
97
98	/*
99	* Reset and start 680x0 emulation (doesn't return)
100	*/
101
102	void Start680x0(void)
103	{
104	m68k_reset();
105	m68k_go(true);
106	}
107
108
109	/*
110	* Trigger interrupt
111	*/
112
113	void TriggerInterrupt(void)
114	{
115	regs.spcflags \|= SPCFLAG_INT;
116	}
117
118
119	/*
120	* Get 68k interrupt level
121	*/
122
123	int intlev(void)
124	{
125	return InterruptFlags ? 1 : 0;
126	}
127
128
129	/*
130	* Execute MacOS 68k trap
131	* r->a[7] and r->sr are unused!
132	*/
133
134	void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
135	{
136	int i;
137
138	// Save old PC
139	uaecptr oldpc = m68k_getpc();
140
141	// Set registers
142	for (i=0; i<8; i++)
143	m68k_dreg(regs, i) = r->d[i];
144	for (i=0; i<7; i++)
145	m68k_areg(regs, i) = r->a[i];
146
147	// Push trap and EXEC_RETURN on stack
148	m68k_areg(regs, 7) -= 2;
149	put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
150	m68k_areg(regs, 7) -= 2;
151	put_word(m68k_areg(regs, 7), trap);
152
153	// Execute trap
154	m68k_setpc(m68k_areg(regs, 7));
155	fill_prefetch_0();
156	quit_program = 0;
157	m68k_go(true);
158
159	// Clean up stack
160	m68k_areg(regs, 7) += 4;
161
162	// Restore old PC
163	m68k_setpc(oldpc);
164	fill_prefetch_0();
165
166	// Get registers
167	for (i=0; i<8; i++)
168	r->d[i] = m68k_dreg(regs, i);
169	for (i=0; i<7; i++)
170	r->a[i] = m68k_areg(regs, i);
171	quit_program = 0;
172	}
173
174
175	/*
176	* Execute 68k subroutine
177	* The executed routine must reside in UAE memory!
178	* r->a[7] and r->sr are unused!
179	*/
180
181	void Execute68k(uint32 addr, struct M68kRegisters *r)
182	{
183	int i;
184
185	// Save old PC
186	uaecptr oldpc = m68k_getpc();
187
188	// Set registers
189	for (i=0; i<8; i++)
190	m68k_dreg(regs, i) = r->d[i];
191	for (i=0; i<7; i++)
192	m68k_areg(regs, i) = r->a[i];
193
194	// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
195	m68k_areg(regs, 7) -= 2;
196	put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
197	m68k_areg(regs, 7) -= 4;
198	put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
199
200	// Execute routine
201	m68k_setpc(addr);
202	fill_prefetch_0();
203	quit_program = 0;
204	m68k_go(true);
205
206	// Clean up stack
207	m68k_areg(regs, 7) += 2;
208
209	// Restore old PC
210	m68k_setpc(oldpc);
211	fill_prefetch_0();
212
213	// Get registers
214	for (i=0; i<8; i++)
215	r->d[i] = m68k_dreg(regs, i);
216	for (i=0; i<7; i++)
217	r->a[i] = m68k_areg(regs, i);
218	quit_program = 0;
219	}