1 | /*****************************************************************************/ |
2 | /* */ |
3 | /* mmodel.c */ |
4 | /* */ |
5 | /* Memory model definitions */ |
6 | /* */ |
7 | /* */ |
8 | /* */ |
9 | /* (C) 2003 Ullrich von Bassewitz */ |
10 | /* Roemerstrasse 52 */ |
11 | /* D-70794 Filderstadt */ |
12 | /* EMail: uz@cc65.org */ |
13 | /* */ |
14 | /* */ |
15 | /* This software is provided 'as-is', without any expressed or implied */ |
16 | /* warranty. In no event will the authors be held liable for any damages */ |
17 | /* arising from the use of this software. */ |
18 | /* */ |
19 | /* Permission is granted to anyone to use this software for any purpose, */ |
20 | /* including commercial applications, and to alter it and redistribute it */ |
21 | /* freely, subject to the following restrictions: */ |
22 | /* */ |
23 | /* 1. The origin of this software must not be misrepresented; you must not */ |
24 | /* claim that you wrote the original software. If you use this software */ |
25 | /* in a product, an acknowledgment in the product documentation would be */ |
26 | /* appreciated but is not required. */ |
27 | /* 2. Altered source versions must be plainly marked as such, and must not */ |
28 | /* be misrepresented as being the original software. */ |
29 | /* 3. This notice may not be removed or altered from any source */ |
30 | /* distribution. */ |
31 | /* */ |
32 | /*****************************************************************************/ |
33 | |
34 | |
35 | |
36 | #include <string.h> |
37 | |
38 | /* common */ |
39 | #include "addrsize.h" |
40 | #include "mmodel.h" |
41 | |
42 | |
43 | |
44 | /*****************************************************************************/ |
45 | /* Data */ |
46 | /*****************************************************************************/ |
47 | |
48 | |
49 | |
50 | /* Memory model in use */ |
51 | mmodel_t MemoryModel = MMODEL_UNKNOWN; |
52 | |
53 | /* Table with memory model names */ |
54 | static const char* MemoryModelNames[MMODEL_COUNT] = { |
55 | "near" , |
56 | "far" , |
57 | "huge" , |
58 | }; |
59 | |
60 | /* Address sizes for the segments */ |
61 | unsigned char CodeAddrSize = ADDR_SIZE_ABS; |
62 | unsigned char DataAddrSize = ADDR_SIZE_ABS; |
63 | unsigned char ZpAddrSize = ADDR_SIZE_ZP; |
64 | |
65 | |
66 | |
67 | /*****************************************************************************/ |
68 | /* Code */ |
69 | /*****************************************************************************/ |
70 | |
71 | |
72 | |
73 | mmodel_t FindMemoryModel (const char* Name) |
74 | /* Find a memory model by name. Return MMODEL_UNKNOWN for an unknown name. */ |
75 | { |
76 | unsigned I; |
77 | |
78 | /* Check all CPU names */ |
79 | for (I = 0; I < MMODEL_COUNT; ++I) { |
80 | if (strcmp (MemoryModelNames[I], Name) == 0) { |
81 | return (mmodel_t)I; |
82 | } |
83 | } |
84 | |
85 | /* Not found */ |
86 | return MMODEL_UNKNOWN; |
87 | } |
88 | |
89 | |
90 | |
91 | void SetMemoryModel (mmodel_t Model) |
92 | /* Set the memory model updating the MemoryModel variables and the address |
93 | ** sizes for the segments. |
94 | */ |
95 | { |
96 | /* Remember the memory model */ |
97 | MemoryModel = Model; |
98 | |
99 | /* Set the address sizes for the segments */ |
100 | switch (MemoryModel) { |
101 | |
102 | case MMODEL_NEAR: |
103 | /* Code: near, data: near */ |
104 | CodeAddrSize = ADDR_SIZE_ABS; |
105 | DataAddrSize = ADDR_SIZE_ABS; |
106 | break; |
107 | |
108 | case MMODEL_FAR: |
109 | /* Code: far, data: near */ |
110 | CodeAddrSize = ADDR_SIZE_FAR; |
111 | DataAddrSize = ADDR_SIZE_ABS; |
112 | break; |
113 | |
114 | case MMODEL_HUGE: |
115 | /* Code: far, data: far */ |
116 | CodeAddrSize = ADDR_SIZE_FAR; |
117 | DataAddrSize = ADDR_SIZE_FAR; |
118 | break; |
119 | |
120 | default: |
121 | break; |
122 | } |
123 | |
124 | /* Zeropage is always zeropage */ |
125 | ZpAddrSize = ADDR_SIZE_ZP; |
126 | } |
127 | |