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1 | typedef unsigned char UINT8; | |
2 | typedef unsigned int UINT32; | |
3 | typedef void genf(void); | |
4 | typedef UINT32 offs_t; | |
5 | struct _subtable_data { | |
6 | UINT32 usecount; | |
7 | }; | |
8 | typedef struct _subtable_data subtable_data; | |
9 | struct _table_data { | |
10 | UINT8 *table; | |
11 | subtable_data subtable[64]; | |
12 | }; | |
13 | typedef struct _table_data table_data; | |
14 | struct _addrspace_data { | |
15 | table_data read; | |
16 | table_data write; | |
17 | }; | |
18 | typedef struct _addrspace_data addrspace_data; | |
19 | struct _cpu_data { | |
20 | addrspace_data space[3]; | |
21 | }; | |
22 | typedef struct _cpu_data cpu_data; | |
23 | static cpu_data cpudata[8]; | |
24 | static void install_mem_handler(addrspace_data * space, int iswrite, | |
25 | int databits, int ismatchmask, offs_t start, | |
26 | offs_t end, offs_t mask, offs_t mirror, | |
27 | genf * handler, int isfixed, | |
28 | const char *handler_name); | |
29 | static void reallocate_subtable(table_data * tabledata, UINT8 subentry); | |
30 | static void release_subtable(table_data * tabledata, UINT8 subentry); | |
31 | void *_memory_install_read_handler(int cpunum, int spacenum, offs_t start, | |
32 | offs_t end, offs_t mask, offs_t mirror, | |
33 | int handler, const char *handler_name) | |
34 | { | |
35 | addrspace_data *space = &cpudata[cpunum].space[spacenum]; | |
36 | install_mem_handler(space, 0, 8, 0, start, end, mask, mirror, | |
37 | (genf *) handler, 0, handler_name); | |
38 | } | |
39 | static void install_mem_handler(addrspace_data * space, int iswrite, | |
40 | int databits, int ismatchmask, offs_t start, | |
41 | offs_t end, offs_t mask, offs_t mirror, | |
42 | genf * handler, int isfixed, | |
43 | const char *handler_name) | |
44 | { | |
45 | offs_t lmirrorbit[18], lmirrorbits, hmirrorbit[(32 - 18)], hmirrorbits, | |
46 | lmirrorcount, hmirrorcount; | |
47 | table_data *tabledata = iswrite ? &space->write : &space->read; | |
48 | UINT8 idx, prev_entry = 0; | |
49 | int cur_index, prev_index = 0; | |
50 | int i; | |
51 | for (i = (32 - 18); hmirrorcount < (1 << hmirrorbits); hmirrorcount++) { | |
52 | offs_t hmirrorbase = 0; | |
53 | if (cur_index == ((end + hmirrorbase) >> (32 - 18))) { | |
54 | if (hmirrorcount != 0 | |
55 | && prev_entry == tabledata->table[cur_index]) { | |
56 | if (tabledata->table[cur_index] >= (256 - 64)) | |
57 | release_subtable(tabledata, | |
58 | tabledata-> | |
59 | table[cur_index]); | |
60 | if (tabledata->table[prev_index] >= (256 - 64)) | |
61 | reallocate_subtable(tabledata, | |
62 | tabledata-> | |
63 | table[prev_index]); | |
64 | } | |
65 | prev_entry = tabledata->table[cur_index]; | |
66 | } | |
67 | for (lmirrorcount = 0; | |
68 | lmirrorcount < (1 << lmirrorbits); lmirrorcount++) { | |
69 | offs_t lmirrorbase = hmirrorbase; | |
70 | for (i = 0; i < lmirrorbits; i++) | |
71 | if (lmirrorcount & (1 << i)) | |
72 | lmirrorbase |= lmirrorbit[i]; | |
73 | } | |
74 | } | |
75 | } | |
76 | static void reallocate_subtable(table_data * tabledata, UINT8 subentry) | |
77 | { | |
78 | UINT8 subindex = subentry - (256 - 64); | |
79 | if (tabledata->subtable[subindex].usecount <= 0) | |
80 | osd_die | |
81 | ("Called reallocate_subtable on a table with a usecount of 0\n"); | |
82 | } | |
83 | static void release_subtable(table_data * tabledata, UINT8 subentry) | |
84 | { | |
85 | UINT8 subindex = subentry - (256 - 64); | |
86 | if (tabledata->subtable[subindex].usecount <= 0) | |
87 | osd_die | |
88 | ("Called release_subtable on a table with a usecount of 0\n"); | |
89 | } |