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;                      // 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();
#ifdef USE_COMPILER
        compiler_init();
#endif
        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:	1.4
Committed:	2000-07-14T21:29:15Z (24 years, 4 months ago) by cebix
Branch:	MAIN
Changes since 1.3:	+3 -0 lines
Log Message:	- AmigaOS bug fixes by J.Lachmann (floppy, 2060scsi.device, "Add Volume" in prefs editor) - imported some changes from the Windows source (1Hz interrupt, FPU fixes)
#	Content
1	/*
2	* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3	*
4	* Basilisk II (C) 1997-2000 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
23	#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	uint32 RAMBaseMac; // RAM base (Mac address space)
36	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	// From newcpu.cpp
50	extern int quit_program;
51
52
53	/*
54	* Initialize 680x0 emulation, CheckROM() must have been called first
55	*/
56
57	bool Init680x0(void)
58	{
59	#if REAL_ADDRESSING
60	// Mac address space = host address space
61	RAMBaseMac = (uint32)RAMBaseHost;
62	ROMBaseMac = (uint32)ROMBaseHost;
63	#else
64	// Initialize UAE memory banks
65	RAMBaseMac = 0;
66	switch (ROMVersion) {
67	case ROM_VERSION_64K:
68	case ROM_VERSION_PLUS:
69	case ROM_VERSION_CLASSIC:
70	ROMBaseMac = 0x00400000;
71	break;
72	case ROM_VERSION_II:
73	ROMBaseMac = 0x00a00000;
74	break;
75	case ROM_VERSION_32:
76	ROMBaseMac = 0x40800000;
77	break;
78	default:
79	return false;
80	}
81	memory_init();
82	#endif
83
84	init_m68k();
85	#ifdef USE_COMPILER
86	compiler_init();
87	#endif
88	return true;
89	}
90
91
92	/*
93	* Deinitialize 680x0 emulation
94	*/
95
96	void Exit680x0(void)
97	{
98	}
99
100
101	/*
102	* Reset and start 680x0 emulation (doesn't return)
103	*/
104
105	void Start680x0(void)
106	{
107	m68k_reset();
108	m68k_go(true);
109	}
110
111
112	/*
113	* Trigger interrupt
114	*/
115
116	void TriggerInterrupt(void)
117	{
118	regs.spcflags \|= SPCFLAG_INT;
119	}
120
121
122	/*
123	* Get 68k interrupt level
124	*/
125
126	int intlev(void)
127	{
128	return InterruptFlags ? 1 : 0;
129	}
130
131
132	/*
133	* Execute MacOS 68k trap
134	* r->a[7] and r->sr are unused!
135	*/
136
137	void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
138	{
139	int i;
140
141	// Save old PC
142	uaecptr oldpc = m68k_getpc();
143
144	// Set registers
145	for (i=0; i<8; i++)
146	m68k_dreg(regs, i) = r->d[i];
147	for (i=0; i<7; i++)
148	m68k_areg(regs, i) = r->a[i];
149
150	// Push trap and EXEC_RETURN on stack
151	m68k_areg(regs, 7) -= 2;
152	put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
153	m68k_areg(regs, 7) -= 2;
154	put_word(m68k_areg(regs, 7), trap);
155
156	// Execute trap
157	m68k_setpc(m68k_areg(regs, 7));
158	fill_prefetch_0();
159	quit_program = 0;
160	m68k_go(true);
161
162	// Clean up stack
163	m68k_areg(regs, 7) += 4;
164
165	// Restore old PC
166	m68k_setpc(oldpc);
167	fill_prefetch_0();
168
169	// Get registers
170	for (i=0; i<8; i++)
171	r->d[i] = m68k_dreg(regs, i);
172	for (i=0; i<7; i++)
173	r->a[i] = m68k_areg(regs, i);
174	quit_program = 0;
175	}
176
177
178	/*
179	* Execute 68k subroutine
180	* The executed routine must reside in UAE memory!
181	* r->a[7] and r->sr are unused!
182	*/
183
184	void Execute68k(uint32 addr, struct M68kRegisters *r)
185	{
186	int i;
187
188	// Save old PC
189	uaecptr oldpc = m68k_getpc();
190
191	// Set registers
192	for (i=0; i<8; i++)
193	m68k_dreg(regs, i) = r->d[i];
194	for (i=0; i<7; i++)
195	m68k_areg(regs, i) = r->a[i];
196
197	// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
198	m68k_areg(regs, 7) -= 2;
199	put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
200	m68k_areg(regs, 7) -= 4;
201	put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
202
203	// Execute routine
204	m68k_setpc(addr);
205	fill_prefetch_0();
206	quit_program = 0;
207	m68k_go(true);
208
209	// Clean up stack
210	m68k_areg(regs, 7) += 2;
211
212	// Restore old PC
213	m68k_setpc(oldpc);
214	fill_prefetch_0();
215
216	// Get registers
217	for (i=0; i<8; i++)
218	r->d[i] = m68k_dreg(regs, i);
219	for (i=0; i<7; i++)
220	r->a[i] = m68k_areg(regs, i);
221	quit_program = 0;
222	}