src/uae_cpu/basilisk_glue.cpp

/*
 *  basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
 *
 *  Basilisk II (C) 1997-1999 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();
        compiler_init();
        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:	1.2
Committed:	1999-11-03T10:56:33Z (25 years, 1 month ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-22121999, release-0_8-1
Changes since 1.1:	+1 -0 lines
Log Message:	- imported UAE CPU 0.8.10 changes - new utility functions Mac_memset, Mac2Host_memcpy, Host2Mac_memcpu and Mac2Mac_memcpy - extfs.cpp: fixed bug in fs_rename() and fs_cat_move() (auxiliary IOParam block was not in Mac address space) - some provisions for using UAE CPU compiler (doesn't work yet)
#	User	Rev	Content
1	cebix	1.1	/*
2			* basilisk_glue.cpp - Glue UAE CPU to Basilisk II CPU engine interface
3			*
4			* Basilisk II (C) 1997-1999 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			#include "cpu_emulation.h"
23			#include "main.h"
24			#include "emul_op.h"
25			#include "rom_patches.h"
26			#include "m68k.h"
27			#include "memory.h"
28			#include "readcpu.h"
29			#include "newcpu.h"
30			#include "compiler.h"
31
32
33			// RAM and ROM pointers
34			uint32 RAMBaseMac; // RAM base (Mac address space)
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			// From newcpu.cpp
49			extern int quit_program;
50
51
52			/*
53			* Initialize 680x0 emulation, CheckROM() must have been called first
54			*/
55
56			bool Init680x0(void)
57			{
58			#if REAL_ADDRESSING
59			// Mac address space = host address space
60			RAMBaseMac = (uint32)RAMBaseHost;
61			ROMBaseMac = (uint32)ROMBaseHost;
62			#else
63			// Initialize UAE memory banks
64			RAMBaseMac = 0;
65			switch (ROMVersion) {
66			case ROM_VERSION_64K:
67			case ROM_VERSION_PLUS:
68			case ROM_VERSION_CLASSIC:
69			ROMBaseMac = 0x00400000;
70			break;
71			case ROM_VERSION_II:
72			ROMBaseMac = 0x00a00000;
73			break;
74			case ROM_VERSION_32:
75			ROMBaseMac = 0x40800000;
76			break;
77			default:
78			return false;
79			}
80			memory_init();
81			#endif
82
83			init_m68k();
84	cebix	1.2	compiler_init();
85	cebix	1.1	return true;
86			}
87
88
89			/*
90			* Deinitialize 680x0 emulation
91			*/
92
93			void Exit680x0(void)
94			{
95			}
96
97
98			/*
99			* Reset and start 680x0 emulation (doesn't return)
100			*/
101
102			void Start680x0(void)
103			{
104			m68k_reset();
105			m68k_go(true);
106			}
107
108
109			/*
110			* Trigger interrupt
111			*/
112
113			void TriggerInterrupt(void)
114			{
115			regs.spcflags \|= SPCFLAG_INT;
116			}
117
118
119			/*
120			* Get 68k interrupt level
121			*/
122
123			int intlev(void)
124			{
125			return InterruptFlags ? 1 : 0;
126			}
127
128
129			/*
130			* Execute MacOS 68k trap
131			* r->a[7] and r->sr are unused!
132			*/
133
134			void Execute68kTrap(uint16 trap, struct M68kRegisters *r)
135			{
136			int i;
137
138			// Save old PC
139			uaecptr oldpc = m68k_getpc();
140
141			// Set registers
142			for (i=0; i<8; i++)
143			m68k_dreg(regs, i) = r->d[i];
144			for (i=0; i<7; i++)
145			m68k_areg(regs, i) = r->a[i];
146
147			// Push trap and EXEC_RETURN on stack
148			m68k_areg(regs, 7) -= 2;
149			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
150			m68k_areg(regs, 7) -= 2;
151			put_word(m68k_areg(regs, 7), trap);
152
153			// Execute trap
154			m68k_setpc(m68k_areg(regs, 7));
155			fill_prefetch_0();
156			quit_program = 0;
157			m68k_go(true);
158
159			// Clean up stack
160			m68k_areg(regs, 7) += 4;
161
162			// Restore old PC
163			m68k_setpc(oldpc);
164			fill_prefetch_0();
165
166			// Get registers
167			for (i=0; i<8; i++)
168			r->d[i] = m68k_dreg(regs, i);
169			for (i=0; i<7; i++)
170			r->a[i] = m68k_areg(regs, i);
171			quit_program = 0;
172			}
173
174
175			/*
176			* Execute 68k subroutine
177			* The executed routine must reside in UAE memory!
178			* r->a[7] and r->sr are unused!
179			*/
180
181			void Execute68k(uint32 addr, struct M68kRegisters *r)
182			{
183			int i;
184
185			// Save old PC
186			uaecptr oldpc = m68k_getpc();
187
188			// Set registers
189			for (i=0; i<8; i++)
190			m68k_dreg(regs, i) = r->d[i];
191			for (i=0; i<7; i++)
192			m68k_areg(regs, i) = r->a[i];
193
194			// Push EXEC_RETURN and faked return address (points to EXEC_RETURN) on stack
195			m68k_areg(regs, 7) -= 2;
196			put_word(m68k_areg(regs, 7), M68K_EXEC_RETURN);
197			m68k_areg(regs, 7) -= 4;
198			put_long(m68k_areg(regs, 7), m68k_areg(regs, 7) + 4);
199
200			// Execute routine
201			m68k_setpc(addr);
202			fill_prefetch_0();
203			quit_program = 0;
204			m68k_go(true);
205
206			// Clean up stack
207			m68k_areg(regs, 7) += 2;
208
209			// Restore old PC
210			m68k_setpc(oldpc);
211			fill_prefetch_0();
212
213			// Get registers
214			for (i=0; i<8; i++)
215			r->d[i] = m68k_dreg(regs, i);
216			for (i=0; i<7; i++)
217			r->a[i] = m68k_areg(regs, i);
218			quit_program = 0;
219			}