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, 4 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.
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4	cebix	1.8	* Basilisk II (C) 1997-2001 Christian Bauer
5	cebix	1.1	*
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	cebix	1.4
23	cebix	1.1	#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	gbeauche	1.7	uint32 RAMBaseMac = 0; // RAM base (Mac address space) gb-- init is important
35	cebix	1.1	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	gbeauche	1.7	#if DIRECT_ADDRESSING
49			uintptr MEMBaseDiff; // Global offset between a Mac address and its Host equivalent
50			#endif
51
52	cebix	1.1	// 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	gbeauche	1.7	#elif DIRECT_ADDRESSING
67	gbeauche	1.10	// 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	cebix	1.1	#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	gbeauche	1.6	exit_m68k();
104	cebix	1.1	}
105
106
107			/*
108	cebix	1.11	* 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	cebix	1.1	* 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	cebix	1.5	void TriggerNMI(void)
139			{
140			//!! not implemented yet
141			}
142
143	cebix	1.1
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			}