src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-2002 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
        // Mac address space = host address space minus constant offset (MEMBaseDiff)
        // NOTE: MEMBaseDiff is set in main_unix.cpp/main()
        RAMBaseMac = 0;
        ROMBaseMac = Host2MacAddr(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)
{
        exit_m68k();
}


/*
 *  Initialize memory mapping of frame buffer (called upon video mode change)
 */

void InitFrameBufferMapping(void)
{
#if !REAL_ADDRESSING && !DIRECT_ADDRESSING
        memory_init();
#endif
}

/*
 *  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:	1.12
Committed:	2002-01-15T14:58:43Z (22 years, 4 months ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-15012002
Changes since 1.11:	+1 -1 lines
Log Message:	- documentation updates - 2001 -> 2002 - version 0.9 -> 1.0
#	Content
1	/*
2	* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3	*
4	* Basilisk II (C) 1997-2002 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
32
33	// RAM and ROM pointers
34	uint32 RAMBaseMac = 0; // RAM base (Mac address space) gb-- init is important
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	#if DIRECT_ADDRESSING
49	uintptr MEMBaseDiff; // Global offset between a Mac address and its Host equivalent
50	#endif
51
52	// 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	#elif DIRECT_ADDRESSING
67	// Mac address space = host address space minus constant offset (MEMBaseDiff)
68	// NOTE: MEMBaseDiff is set in main_unix.cpp/main()
69	RAMBaseMac = 0;
70	ROMBaseMac = Host2MacAddr(ROMBaseHost);
71	#else
72	// Initialize UAE memory banks
73	RAMBaseMac = 0;
74	switch (ROMVersion) {
75	case ROM_VERSION_64K:
76	case ROM_VERSION_PLUS:
77	case ROM_VERSION_CLASSIC:
78	ROMBaseMac = 0x00400000;
79	break;
80	case ROM_VERSION_II:
81	ROMBaseMac = 0x00a00000;
82	break;
83	case ROM_VERSION_32:
84	ROMBaseMac = 0x40800000;
85	break;
86	default:
87	return false;
88	}
89	memory_init();
90	#endif
91
92	init_m68k();
93	return true;
94	}
95
96
97	/*
98	* Deinitialize 680x0 emulation
99	*/
100
101	void Exit680x0(void)
102	{
103	exit_m68k();
104	}
105
106
107	/*
108	* Initialize memory mapping of frame buffer (called upon video mode change)
109	*/
110
111	void InitFrameBufferMapping(void)
112	{
113	#if !REAL_ADDRESSING && !DIRECT_ADDRESSING
114	memory_init();
115	#endif
116	}
117
118	/*
119	* Reset and start 680x0 emulation (doesn't return)
120	*/
121
122	void Start680x0(void)
123	{
124	m68k_reset();
125	m68k_go(true);
126	}
127
128
129	/*
130	* Trigger interrupt
131	*/
132
133	void TriggerInterrupt(void)
134	{
135	regs.spcflags \|= SPCFLAG_INT;
136	}
137
138	void TriggerNMI(void)
139	{
140	//!! not implemented yet
141	}
142
143
144	/*
145	* Get 68k interrupt level
146	*/
147
148	int intlev(void)
149	{
150	return InterruptFlags ? 1 : 0;
151	}
152
153
154	/*
155	* Execute MacOS 68k trap
156	* r->a[7] and r->sr are unused!
157	*/
158
159	void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
160	{
161	int i;
162
163	// Save old PC
164	uaecptr oldpc = m68k_getpc();
165
166	// Set registers
167	for (i=0; i<8; i++)
168	m68k_dreg(regs, i) = r->d[i];
169	for (i=0; i<7; i++)
170	m68k_areg(regs, i) = r->a[i];
171
172	// Push trap and EXEC_RETURN on stack
173	m68k_areg(regs, 7) -= 2;
174	put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
175	m68k_areg(regs, 7) -= 2;
176	put_word(m68k_areg(regs, 7), trap);
177
178	// Execute trap
179	m68k_setpc(m68k_areg(regs, 7));
180	fill_prefetch_0();
181	quit_program = 0;
182	m68k_go(true);
183
184	// Clean up stack
185	m68k_areg(regs, 7) += 4;
186
187	// Restore old PC
188	m68k_setpc(oldpc);
189	fill_prefetch_0();
190
191	// Get registers
192	for (i=0; i<8; i++)
193	r->d[i] = m68k_dreg(regs, i);
194	for (i=0; i<7; i++)
195	r->a[i] = m68k_areg(regs, i);
196	quit_program = 0;
197	}
198
199
200	/*
201	* Execute 68k subroutine
202	* The executed routine must reside in UAE memory!
203	* r->a[7] and r->sr are unused!
204	*/
205
206	void Execute68k(uint32 addr, struct M68kRegisters *r)
207	{
208	int i;
209
210	// Save old PC
211	uaecptr oldpc = m68k_getpc();
212
213	// Set registers
214	for (i=0; i<8; i++)
215	m68k_dreg(regs, i) = r->d[i];
216	for (i=0; i<7; i++)
217	m68k_areg(regs, i) = r->a[i];
218
219	// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
220	m68k_areg(regs, 7) -= 2;
221	put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
222	m68k_areg(regs, 7) -= 4;
223	put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
224
225	// Execute routine
226	m68k_setpc(addr);
227	fill_prefetch_0();
228	quit_program = 0;
229	m68k_go(true);
230
231	// Clean up stack
232	m68k_areg(regs, 7) += 2;
233
234	// Restore old PC
235	m68k_setpc(oldpc);
236	fill_prefetch_0();
237
238	// Get registers
239	for (i=0; i<8; i++)
240	r->d[i] = m68k_dreg(regs, i);
241	for (i=0; i<7; i++)
242	r->a[i] = m68k_areg(regs, i);
243	quit_program = 0;
244	}