lxdream 0.9.1| filename | src/sh4/sh4mmio.c |
| changeset | 830:73637b9624e4 |
| prev | 736:a02d1475ccfd |
| next | 929:fd8cb0c82f5f |
| author | nkeynes |
| date | Thu Dec 11 23:26:03 2008 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Disable the generational translation cache - I've got no evidence that it actually helps performance, and it simplifies things to get rid of it (in particular, translated code doesn't have to worry about being moved now). |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * Miscellaneous and not-really-implemented SH4 peripheral modules. Also
5 * responsible for including the IMPL side of the SH4 MMIO pages.
6 * Most of these will eventually be split off into their own files.
7 *
8 * Copyright (c) 2005 Nathan Keynes.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20 #define MODULE sh4_module
22 #include "dream.h"
23 #include "dreamcast.h"
24 #include "mem.h"
25 #include "clock.h"
26 #include "sh4/sh4core.h"
27 #include "sh4/sh4mmio.h"
28 #define MMIO_IMPL
29 #include "sh4/sh4mmio.h"
31 /********************************* BSC *************************************/
33 uint32_t bsc_input = 0x0300;
35 uint16_t bsc_read_pdtra()
36 {
37 int i;
38 uint32_t pctra = MMIO_READ( BSC, PCTRA );
39 uint16_t output = MMIO_READ( BSC, PDTRA );
40 uint16_t input_mask = 0, output_mask = 0;
41 for( i=0; i<16; i++ ) {
42 int bits = (pctra >> (i<<1)) & 0x03;
43 if( bits == 2 ) input_mask |= (1<<i);
44 else if( bits != 0 ) output_mask |= (1<<i);
45 }
47 /* ??? */
48 if( ((output | (~output_mask)) & 0x03) == 3 ) {
49 output |= 0x03;
50 } else {
51 output &= ~0x03;
52 }
54 return (bsc_input & input_mask) | output;
55 }
57 uint32_t bsc_read_pdtrb()
58 {
59 int i;
60 uint32_t pctrb = MMIO_READ( BSC, PCTRB );
61 uint16_t output = MMIO_READ( BSC, PDTRB );
62 uint16_t input_mask = 0, output_mask = 0;
63 for( i=0; i<4; i++ ) {
64 int bits = (pctrb >> (i<<1)) & 0x03;
65 if( bits == 2 ) input_mask |= (1<<i);
66 else if( bits != 0 ) output_mask |= (1<<i);
67 }
69 return ((bsc_input>>16) & input_mask) | output;
71 }
73 MMIO_REGION_WRITE_DEFFN(BSC)
75 int32_t mmio_region_BSC_read( uint32_t reg )
76 {
77 int32_t val;
78 switch( reg ) {
79 case PDTRA:
80 val = bsc_read_pdtra();
81 break;
82 case PDTRB:
83 val = bsc_read_pdtrb();
84 break;
85 default:
86 val = MMIO_READ( BSC, reg );
87 }
88 return val;
89 }
91 /********************************* UBC *************************************/
93 int32_t mmio_region_UBC_read( uint32_t reg )
94 {
95 return MMIO_READ( UBC, reg );
96 }
98 void mmio_region_UBC_write( uint32_t reg, uint32_t val )
99 {
100 switch( reg ) {
101 case BAMRA:
102 case BAMRB:
103 val &= 0x0F;
104 break;
105 case BBRA:
106 case BBRB:
107 val &= 0x07F;
108 if( val != 0 ) {
109 WARN( "UBC not implemented" );
110 }
111 break;
112 case BRCR:
113 val &= 0xC4C9;
114 break;
115 }
116 MMIO_WRITE( UBC, reg, val );
117 }
120 /********************************** SCI *************************************/
122 MMIO_REGION_STUBFNS( SCI )
.