nkeynes@953 | 1 | /**
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nkeynes@953 | 2 | * $Id$
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nkeynes@953 | 3 | *
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nkeynes@953 | 4 | * Dreamcast main SDRAM - access methods and timing controls. This is fairly
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nkeynes@953 | 5 | * directly coupled to the SH4
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nkeynes@953 | 6 | *
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nkeynes@953 | 7 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@953 | 8 | *
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nkeynes@953 | 9 | * This program is free software; you can redistribute it and/or modify
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nkeynes@953 | 10 | * it under the terms of the GNU General Public License as published by
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nkeynes@953 | 11 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@953 | 12 | * (at your option) any later version.
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nkeynes@953 | 13 | *
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nkeynes@953 | 14 | * This program is distributed in the hope that it will be useful,
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nkeynes@953 | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@953 | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@953 | 17 | * GNU General Public License for more details.
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nkeynes@953 | 18 | */
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nkeynes@953 | 19 |
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nkeynes@953 | 20 | #include "lxdream.h"
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nkeynes@953 | 21 | #include "mem.h"
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nkeynes@953 | 22 | #include "dreamcast.h"
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nkeynes@991 | 23 | #include "xlat/xltcache.h"
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nkeynes@953 | 24 | #include <string.h>
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nkeynes@953 | 25 |
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nkeynes@953 | 26 |
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nkeynes@953 | 27 | static int32_t FASTCALL ext_sdram_read_long( sh4addr_t addr )
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nkeynes@953 | 28 | {
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nkeynes@953 | 29 | return *((int32_t *)(dc_main_ram + (addr&0x00FFFFFF)));
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nkeynes@953 | 30 | }
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nkeynes@953 | 31 | static int32_t FASTCALL ext_sdram_read_word( sh4addr_t addr )
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nkeynes@953 | 32 | {
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nkeynes@953 | 33 | return SIGNEXT16(*((int16_t *)(dc_main_ram + (addr&0x00FFFFFF))));
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nkeynes@953 | 34 | }
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nkeynes@953 | 35 | static int32_t FASTCALL ext_sdram_read_byte( sh4addr_t addr )
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nkeynes@953 | 36 | {
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nkeynes@953 | 37 | return SIGNEXT8(*((int16_t *)(dc_main_ram + (addr&0x00FFFFFF))));
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nkeynes@953 | 38 | }
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nkeynes@953 | 39 | static void FASTCALL ext_sdram_write_long( sh4addr_t addr, uint32_t val )
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nkeynes@953 | 40 | {
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nkeynes@953 | 41 | *(uint32_t *)(dc_main_ram + (addr&0x00FFFFFF)) = val;
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nkeynes@953 | 42 | xlat_invalidate_long(addr);
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nkeynes@953 | 43 | }
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nkeynes@953 | 44 | static void FASTCALL ext_sdram_write_word( sh4addr_t addr, uint32_t val )
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nkeynes@953 | 45 | {
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nkeynes@953 | 46 | *(uint16_t *)(dc_main_ram + (addr&0x00FFFFFF)) = (uint16_t)val;
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nkeynes@953 | 47 | xlat_invalidate_word(addr);
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nkeynes@953 | 48 | }
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nkeynes@953 | 49 | static void FASTCALL ext_sdram_write_byte( sh4addr_t addr, uint32_t val )
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nkeynes@953 | 50 | {
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nkeynes@953 | 51 | *(uint8_t *)(dc_main_ram + (addr&0x00FFFFFF)) = (uint8_t)val;
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nkeynes@953 | 52 | xlat_invalidate_word(addr);
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nkeynes@953 | 53 | }
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nkeynes@953 | 54 | static void FASTCALL ext_sdram_read_burst( unsigned char *dest, sh4addr_t addr )
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nkeynes@953 | 55 | {
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nkeynes@953 | 56 | memcpy( dest, dc_main_ram+(addr&0x00FFFFFF), 32 );
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nkeynes@953 | 57 | }
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nkeynes@953 | 58 | static void FASTCALL ext_sdram_write_burst( sh4addr_t addr, unsigned char *src )
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nkeynes@953 | 59 | {
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nkeynes@953 | 60 | memcpy( dc_main_ram+(addr&0x00FFFFFF), src, 32 );
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nkeynes@953 | 61 | }
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nkeynes@953 | 62 |
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nkeynes@953 | 63 | struct mem_region_fn mem_region_sdram = { ext_sdram_read_long, ext_sdram_write_long,
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nkeynes@953 | 64 | ext_sdram_read_word, ext_sdram_write_word,
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nkeynes@953 | 65 | ext_sdram_read_byte, ext_sdram_write_byte,
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nkeynes@953 | 66 | ext_sdram_read_burst, ext_sdram_write_burst };
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