451ab91e |
1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
2 | * Mupen64plus - flashram.c * |
3 | * Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ * |
4 | * Copyright (C) 2002 Hacktarux * |
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 * |
18 | * Free Software Foundation, Inc., * |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * |
20 | * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
21 | |
22 | #include <stdio.h> |
23 | #include <string.h> |
24 | #include <stdlib.h> |
25 | |
26 | #include "memory.h" |
27 | #include "flashram.h" |
28 | |
29 | #include "r4300/r4300.h" |
30 | |
31 | #include "api/m64p_types.h" |
32 | #include "api/callbacks.h" |
33 | #include "main/main.h" |
34 | #include "main/rom.h" |
35 | #include "main/util.h" |
36 | |
37 | Flashram_info flashram_info; |
38 | |
39 | typedef enum flashram_mode |
40 | { |
41 | NOPES_MODE = 0, |
42 | ERASE_MODE, |
43 | WRITE_MODE, |
44 | READ_MODE, |
45 | STATUS_MODE |
46 | } Flashram_mode; |
47 | |
48 | static unsigned char flashram[0x20000]; |
49 | |
50 | static char *get_flashram_path(void) |
51 | { |
52 | return formatstr("%s%s.fla", get_savesrampath(), ROM_SETTINGS.goodname); |
53 | } |
54 | |
55 | static void flashram_format(void) |
56 | { |
57 | memset(flashram, 0xff, sizeof(flashram)); |
58 | } |
59 | |
60 | static void flashram_read_file(void) |
61 | { |
62 | char *filename = get_flashram_path(); |
63 | |
64 | flashram_format(); |
65 | switch (read_from_file(filename, flashram, sizeof(flashram))) |
66 | { |
67 | case file_open_error: |
68 | DebugMessage(M64MSG_WARNING, "couldn't open flash ram file '%s' for reading", filename); |
69 | flashram_format(); |
70 | break; |
71 | case file_read_error: |
72 | DebugMessage(M64MSG_WARNING, "couldn't read 128kb flash ram file '%s'", filename); |
73 | break; |
74 | default: break; |
75 | } |
76 | |
77 | free(filename); |
78 | } |
79 | |
80 | static void flashram_write_file(void) |
81 | { |
82 | char *filename = get_flashram_path(); |
83 | |
84 | switch (write_to_file(filename, flashram, sizeof(flashram))) |
85 | { |
86 | case file_open_error: |
87 | DebugMessage(M64MSG_WARNING, "couldn't open flash ram file '%s' for writing", filename); |
88 | break; |
89 | case file_write_error: |
90 | DebugMessage(M64MSG_WARNING, "couldn't write 128kb flash ram file '%s'", filename); |
91 | break; |
92 | default: break; |
93 | } |
94 | |
95 | free(filename); |
96 | } |
97 | |
98 | void init_flashram(void) |
99 | { |
100 | flashram_info.mode = NOPES_MODE; |
101 | flashram_info.status = 0; |
102 | } |
103 | |
104 | unsigned int flashram_status(void) |
105 | { |
106 | return (unsigned int) (flashram_info.status >> 32); |
107 | } |
108 | |
109 | void flashram_command(unsigned int command) |
110 | { |
111 | switch (command & 0xff000000) |
112 | { |
113 | case 0x4b000000: |
114 | flashram_info.erase_offset = (command & 0xffff) * 128; |
115 | break; |
116 | case 0x78000000: |
117 | flashram_info.mode = ERASE_MODE; |
118 | flashram_info.status = 0x1111800800c20000LL; |
119 | break; |
120 | case 0xa5000000: |
121 | flashram_info.erase_offset = (command & 0xffff) * 128; |
122 | flashram_info.status = 0x1111800400c20000LL; |
123 | break; |
124 | case 0xb4000000: |
125 | flashram_info.mode = WRITE_MODE; |
126 | break; |
127 | case 0xd2000000: // execute |
128 | switch (flashram_info.mode) |
129 | { |
130 | case NOPES_MODE: |
131 | break; |
132 | case ERASE_MODE: |
133 | { |
134 | unsigned int i; |
135 | flashram_read_file(); |
136 | for (i=flashram_info.erase_offset; i<(flashram_info.erase_offset+128); i++) |
137 | { |
138 | flashram[i^S8] = 0xff; |
139 | } |
140 | flashram_write_file(); |
141 | } |
142 | break; |
143 | case WRITE_MODE: |
144 | { |
145 | int i; |
146 | flashram_read_file(); |
147 | for (i=0; i<128; i++) |
148 | { |
149 | flashram[(flashram_info.erase_offset+i)^S8]= |
150 | ((unsigned char*)rdram)[(flashram_info.write_pointer+i)^S8]; |
151 | } |
152 | flashram_write_file(); |
153 | } |
154 | break; |
155 | case STATUS_MODE: |
156 | break; |
157 | default: |
158 | DebugMessage(M64MSG_WARNING, "unknown flashram command with mode:%x", (int)flashram_info.mode); |
159 | stop=1; |
160 | break; |
161 | } |
162 | flashram_info.mode = NOPES_MODE; |
163 | break; |
164 | case 0xe1000000: |
165 | flashram_info.mode = STATUS_MODE; |
166 | flashram_info.status = 0x1111800100c20000LL; |
167 | break; |
168 | case 0xf0000000: |
169 | flashram_info.mode = READ_MODE; |
170 | flashram_info.status = 0x11118004f0000000LL; |
171 | break; |
172 | default: |
173 | DebugMessage(M64MSG_WARNING, "unknown flashram command: %x", (int)command); |
174 | break; |
175 | } |
176 | } |
177 | |
178 | void dma_read_flashram(void) |
179 | { |
180 | unsigned int i; |
181 | |
182 | switch (flashram_info.mode) |
183 | { |
184 | case STATUS_MODE: |
185 | rdram[pi_register.pi_dram_addr_reg/4] = (unsigned int)(flashram_info.status >> 32); |
186 | rdram[pi_register.pi_dram_addr_reg/4+1] = (unsigned int)(flashram_info.status); |
187 | break; |
188 | case READ_MODE: |
189 | flashram_read_file(); |
190 | for (i=0; i<(pi_register.pi_wr_len_reg & 0x0FFFFFF)+1; i++) |
191 | { |
192 | ((unsigned char*)rdram)[(pi_register.pi_dram_addr_reg+i)^S8]= |
193 | flashram[(((pi_register.pi_cart_addr_reg-0x08000000)&0xFFFF)*2+i)^S8]; |
194 | } |
195 | break; |
196 | default: |
197 | DebugMessage(M64MSG_WARNING, "unknown dma_read_flashram: %x", flashram_info.mode); |
198 | stop=1; |
199 | break; |
200 | } |
201 | } |
202 | |
203 | void dma_write_flashram(void) |
204 | { |
205 | switch (flashram_info.mode) |
206 | { |
207 | case WRITE_MODE: |
208 | flashram_info.write_pointer = pi_register.pi_dram_addr_reg; |
209 | break; |
210 | default: |
211 | DebugMessage(M64MSG_ERROR, "unknown dma_write_flashram: %x", flashram_info.mode); |
212 | stop=1; |
213 | break; |
214 | } |
215 | } |
216 | |