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 */
51mmodel_t MemoryModel = MMODEL_UNKNOWN;
52
53/* Table with memory model names */
54static const char* MemoryModelNames[MMODEL_COUNT] = {
55 "near",
56 "far",
57 "huge",
58};
59
60/* Address sizes for the segments */
61unsigned char CodeAddrSize = ADDR_SIZE_ABS;
62unsigned char DataAddrSize = ADDR_SIZE_ABS;
63unsigned char ZpAddrSize = ADDR_SIZE_ZP;
64
65
66
67/*****************************************************************************/
68/* Code */
69/*****************************************************************************/
70
71
72
73mmodel_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
91void 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