jcs.org
fork of PCE focusing on macplus, supporting DaynaPort SCSI network emulation
1/*****************************************************************************
2 * pce *
3 *****************************************************************************/
4
5/*****************************************************************************
6 * File name: src/arch/macplus/mem.c *
7 * Created: 2007-11-13 by Hampa Hug <hampa@hampa.ch> *
8 * Copyright: (C) 2007-2011 Hampa Hug <hampa@hampa.ch> *
9 *****************************************************************************/
10
11/*****************************************************************************
12 * This program is free software. You can redistribute it and / or modify it *
13 * under the terms of the GNU General Public License version 2 as published *
14 * by the Free Software Foundation. *
15 * *
16 * This program is distributed in the hope that it will be useful, but *
17 * WITHOUT ANY WARRANTY, without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General *
19 * Public License for more details. *
20 *****************************************************************************/
21
22
23#include "main.h"
24#include "macplus.h"
25#include "mem.h"
26
27
28void mac_set_overlay (macplus_t *sim, int overlay)
29{
30 if (sim->overlay == (overlay != 0)) {
31 return;
32 }
33
34#ifdef DEBUG_MEM
35 mac_log_deb ("mem: overlay = %d\n", overlay);
36#endif
37
38 if (overlay) {
39 mem_rmv_blk (sim->mem, sim->ram);
40 mem_add_blk (sim->mem, sim->rom_ovl, 0);
41 mem_add_blk (sim->mem, sim->ram_ovl, 0);
42
43 e68_set_ram (sim->cpu, NULL, 0);
44
45 sim->overlay = 1;
46 }
47 else {
48 mem_rmv_blk (sim->mem, sim->rom_ovl);
49 mem_rmv_blk (sim->mem, sim->ram_ovl);
50 mem_add_blk (sim->mem, sim->ram, 0);
51
52 e68_set_ram (sim->cpu,
53 mem_blk_get_data (sim->ram),
54 mem_blk_get_size (sim->ram)
55 );
56
57 sim->overlay = 0;
58 }
59}
60
61
62static
63int mac_addr_map (macplus_t *sim, unsigned long *addr)
64{
65 unsigned long val;
66
67 /* repeated RAM images */
68 if (*addr < 0x400000) {
69 if (sim->ram == NULL) {
70 return (0);
71 }
72
73 val = mem_blk_get_size (sim->ram);
74
75 if (val == 0) {
76 return (0);
77 }
78
79 val = *addr % val;
80
81 if (*addr == val) {
82 return (0);
83 }
84
85 *addr = val;
86
87 return (1);
88 }
89
90 /* repeated ROM images */
91 if ((*addr >= 0x400000) && (*addr < 0x580000)) {
92 if (sim->rom == NULL) {
93 return (0);
94 }
95
96 val = mem_blk_get_size (sim->rom);
97
98 if (val == 0) {
99 return (0);
100 }
101
102 val = 0x400000 + (*addr % val);
103
104 if (*addr == val) {
105 return (0);
106 }
107
108 *addr = val;
109
110 return (1);
111 }
112
113 return (0);
114}
115
116unsigned char mac_mem_get_uint8 (void *ext, unsigned long addr)
117{
118 macplus_t *sim = ext;
119
120 if (mac_addr_map (sim, &addr)) {
121 return (mem_get_uint8 (sim->mem, addr));
122 }
123
124 if ((addr >= 0x580000) && (addr < 0x600000)) {
125 return (0x00);
126 }
127
128 if ((addr >= 0xc00000) && (addr < 0xe00000)) {
129 return (mac_iwm_get_uint8 (&sim->iwm, addr - 0xc00000));
130 }
131
132 if ((addr & 0xf00000) == 0xd00000) {
133 return (0xaa);
134 }
135
136#ifdef DEBUG_MEM
137 mac_log_deb ("mem: get 8: %06lX -> 00\n", addr);
138#endif
139
140 return (0);
141}
142
143unsigned short mac_mem_get_uint16 (void *ext, unsigned long addr)
144{
145 macplus_t *sim = ext;
146
147 if (mac_addr_map (sim, &addr)) {
148 return (mem_get_uint16_be (sim->mem, addr));
149 }
150
151#ifdef DEBUG_MEM
152 mac_log_deb ("mem: get 16: %06lX -> 0000\n", addr);
153#endif
154
155 return (0);
156}
157
158unsigned long mac_mem_get_uint32 (void *ext, unsigned long addr)
159{
160 macplus_t *sim = ext;
161
162 if (mac_addr_map (sim, &addr)) {
163 return (mem_get_uint32_be (sim->mem, addr));
164 }
165
166#ifdef DEBUG_MEM
167 mac_log_deb ("mem: get 32: %06lX -> 00000000\n", addr);
168#endif
169
170 return (0);
171}
172
173void mac_mem_set_uint8 (void *ext, unsigned long addr, unsigned char val)
174{
175 macplus_t *sim = ext;
176
177 if (mac_addr_map (sim, &addr)) {
178 mem_set_uint8 (sim->mem, addr, val);
179 }
180
181 if ((addr >= 0x580000) && (addr < 0x600000)) {
182 return;
183 }
184
185 if ((addr >= 0xc00000) && (addr < 0xe00000)) {
186 mac_iwm_set_uint8 (&sim->iwm, addr - 0xc00000, val);
187 return;
188 }
189
190#ifdef DEBUG_MEM
191 mac_log_deb ("mem: set 8: %06lX <- %02X\n", addr, val);
192#endif
193}
194
195void mac_mem_set_uint16 (void *ext, unsigned long addr, unsigned short val)
196{
197 macplus_t *sim = ext;
198
199 if (mac_addr_map (sim, &addr)) {
200 mem_set_uint16_be (sim->mem, addr, val);
201 }
202
203#ifdef DEBUG_MEM
204 mac_log_deb ("mem: set 16: %06lX <- %02X\n", addr, val);
205#endif
206}
207
208void mac_mem_set_uint32 (void *ext, unsigned long addr, unsigned long val)
209{
210 macplus_t *sim = ext;
211
212 if (mac_addr_map (sim, &addr)) {
213 mem_set_uint32_be (sim->mem, addr, val);
214 }
215
216#ifdef DEBUG_MEM
217 mac_log_deb ("mem: set 32: %06lX <- %02lX\n", addr, val);
218#endif
219}