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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 }