src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-2001 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:	1.11
Committed:	2001-06-28T21:20:01Z (23 years, 5 months ago) by cebix
Branch:	MAIN
Changes since 1.10:	+11 -0 lines
Log Message:	video_x.cpp supports resolution switching in windowed mode: the available resolutions are 512x384, 640x480, 800x600, 1024x768 and 1280x1024 (the prefs editor has to be updated to reflect this). The resolution selected in the prefs editor is used as the default, but it can be changed in the Monitors control panel. So far only tested with direct addressing.
#	Content
1	/*
2	* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3	*
4	* Basilisk II (C) 1997-2001 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	}