1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
2 * Mupen64plus - sram.c *
3 * Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ *
4 * Copyright (C) 2014 Bobby Smiles *
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 "sram.h"
23 #include "pi_controller.h"
24
25 #include "memory/memory.h"
26
27 #include "ri/ri_controller.h"
28
29 #include <stddef.h>
30 #include <stdint.h>
31 #include <string.h>
32
init_sram(struct sram * sram,void * user_data,void (* save)(void *),uint8_t * data)33 void init_sram(struct sram* sram, void* user_data, void (*save)(void*), uint8_t* data)
34 {
35 sram->user_data = user_data;
36 sram->save = save;
37 sram->data = data;
38 }
39
sram_save(struct sram * sram)40 void sram_save(struct sram* sram)
41 {
42 sram->save(sram->user_data);
43 }
44
format_sram(uint8_t * sram)45 void format_sram(uint8_t* sram)
46 {
47 memset(sram, 0, SRAM_SIZE);
48 }
49
dma_write_sram(struct pi_controller * pi)50 void dma_write_sram(struct pi_controller* pi)
51 {
52 size_t i;
53 size_t length = (pi->regs[PI_RD_LEN_REG] & 0xffffff) + 1;
54
55 uint8_t* sram = pi->sram.data;
56 uint8_t* dram = (uint8_t*)pi->ri->rdram.dram;
57 uint32_t cart_addr = pi->regs[PI_CART_ADDR_REG] - 0x08000000;
58 uint32_t dram_addr = pi->regs[PI_DRAM_ADDR_REG];
59
60 for(i = 0; i < length; ++i)
61 sram[(cart_addr+i)^S8] = dram[(dram_addr+i)^S8];
62
63 sram_save(&pi->sram);
64 }
65
dma_read_sram(struct pi_controller * pi)66 void dma_read_sram(struct pi_controller* pi)
67 {
68 size_t i;
69 size_t length = (pi->regs[PI_WR_LEN_REG] & 0xffffff) + 1;
70
71 uint8_t* sram = pi->sram.data;
72 uint8_t* dram = (uint8_t*)pi->ri->rdram.dram;
73 uint32_t cart_addr = (pi->regs[PI_CART_ADDR_REG] - 0x08000000) & 0xffff;
74 uint32_t dram_addr = pi->regs[PI_DRAM_ADDR_REG];
75
76 for(i = 0; i < length; ++i)
77 dram[(dram_addr+i)^S8] = sram[(cart_addr+i)^S8];
78 }
79