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)
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4	cebix	1.3	* Basilisk II (C) 1997-2000 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			#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	cebix	1.4	#ifdef USE_COMPILER
86	cebix	1.2	compiler_init();
87	cebix	1.4	#endif
88	cebix	1.1	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			}