bitfield.hh (4244:18391d0467c6) bitfield.hh (4257:337f01885f36)
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

--- 19 unchanged lines hidden (view full) ---

28 * Authors: Steve Reinhardt
29 * Nathan Binkert
30 */
31
32#ifndef __BASE_BITFIELD_HH__
33#define __BASE_BITFIELD_HH__
34
35#include <inttypes.h>
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

--- 19 unchanged lines hidden (view full) ---

28 * Authors: Steve Reinhardt
29 * Nathan Binkert
30 */
31
32#ifndef __BASE_BITFIELD_HH__
33#define __BASE_BITFIELD_HH__
34
35#include <inttypes.h>
36//#include "base/misc.hh"
36
37/**
38 * Generate a 64-bit mask of 'nbits' 1s, right justified.
39 */
40inline uint64_t
41mask(int nbits)
42{
43 return (nbits == 64) ? (uint64_t)-1LL : (1ULL << nbits) - 1;

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125 if (bits(val, 31,16)) { msb += 16; val >>= 16; }
126 if (bits(val, 15,8)) { msb += 8; val >>= 8; }
127 if (bits(val, 7,4)) { msb += 4; val >>= 4; }
128 if (bits(val, 3,2)) { msb += 2; val >>= 2; }
129 if (bits(val, 1,1)) { msb += 1; }
130 return msb;
131}
132
37
38/**
39 * Generate a 64-bit mask of 'nbits' 1s, right justified.
40 */
41inline uint64_t
42mask(int nbits)
43{
44 return (nbits == 64) ? (uint64_t)-1LL : (1ULL << nbits) - 1;

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126 if (bits(val, 31,16)) { msb += 16; val >>= 16; }
127 if (bits(val, 15,8)) { msb += 8; val >>= 8; }
128 if (bits(val, 7,4)) { msb += 4; val >>= 4; }
129 if (bits(val, 3,2)) { msb += 2; val >>= 2; }
130 if (bits(val, 1,1)) { msb += 1; }
131 return msb;
132}
133
134template<class Data, int first, int last=first>
135class BitfieldBase
136{
137 protected:
138 uint8_t __data[sizeof(Data)];
133
139
140 //These are defined here so it can be specialized for Data, but can be
141 //hidden by RO and WO variants.
142 inline uint64_t getBits(int _first, int _last)
143 {
144 //build up the right bits from the byte array "data"
145 //panic("Not yet implemented.\n");
146 return 0;
147 }
134
148
149 inline void setBits(int _first, int _last, uint64_t val)
150 {
151 //Set the right bits from the byte array "data"
152 //panic("Not yet implemented.\n");
153 }
154};
155
156template<class Data, int first, int last=first>
157class BitfieldNativeBase
158{
159 protected:
160 Data __data;
161
162 inline uint64_t getBits(int _first, int _last)
163 {
164 return bits(__data, first, last);
165 }
166
167 inline void setBits(int _first, int _last, uint64_t val)
168 {
169 replaceBits(__data, first, last, val);
170 }
171};
172
173template <int first>
174class BitfieldBase<uint64_t, first, first> :
175 public BitfieldNativeBase<uint64_t, first, first>
176{};
177
178template <int first, int last>
179class BitfieldBase<uint64_t, first, last> :
180 public BitfieldNativeBase<uint64_t, first, last>
181{};
182
183template <int first>
184class BitfieldBase<uint32_t, first, first> :
185 public BitfieldNativeBase<uint32_t, first, first>
186{};
187
188template <int first, int last>
189class BitfieldBase<uint32_t, first, last> :
190 public BitfieldNativeBase<uint32_t, first, last>
191{};
192
193template <int first>
194class BitfieldBase<uint16_t, first, first> :
195 public BitfieldNativeBase<uint16_t, first, first>
196{};
197
198template <int first, int last>
199class BitfieldBase<uint16_t, first, last> :
200 public BitfieldNativeBase<uint16_t, first, last>
201{};
202
203template <int first>
204class BitfieldBase<uint8_t, first, first> :
205 public BitfieldNativeBase<uint8_t, first, first>
206{};
207
208template <int first, int last>
209class BitfieldBase<uint8_t, first, last> :
210 public BitfieldNativeBase<uint8_t, first, last>
211{};
212
213template<class Data, int first, int last=first>
214class _BitfieldRO : public BitfieldBase<Data, first, last>
215{
216 public:
217 operator const Data & ()
218 {
219 return this->getBits(first, last);
220 }
221};
222
223template<class Data, int first, int last=first>
224class _BitfieldWO : public BitfieldBase<Data, first, last>
225{
226 public:
227 const Data & operator = (const Data & _data)
228 {
229 this->setBits(first, last, _data);
230 return *this;
231 }
232};
233
234template<class Data, int first, int last=first>
235class _BitfieldRW : public BitfieldBase<Data, first, last>
236{
237 public:
238 operator const Data ()
239 {
240 return this->getBits(first, last);
241 }
242
243 const Data operator = (const Data & _data)
244 {
245 this->setBits(first, last, _data);
246 return *this;
247 }
248};
249
250template <class Type, class Base>
251class BitUnionOperators : public Base
252{
253 public:
254 operator const Type ()
255 {
256 return Base::__data;
257 }
258
259 const Type operator = (const Type & _data)
260 {
261 Base::__data = _data;
262 }
263
264 bool operator < (const Base & base)
265 {
266 return Base::__data < base.__data;
267 }
268
269 bool operator == (const Base & base)
270 {
271 return Base::__data == base.__data;
272 }
273};
274
275#define __BitUnion(type, name) \
276 class __##name { \
277 public: \
278 typedef type __DataType; \
279 union { \
280 type __data;\
281
282#define EndBitUnion(name) \
283 }; \
284 }; \
285 typedef BitUnionOperators<__##name::__DataType, __##name> name;
286
287#define __SubBitUnion(type, name) \
288 union { \
289 type __data; \
290 inline operator const __DataType () \
291 { return __data; } \
292 \
293 inline const __DataType operator = (const __DataType & _data) \
294 { __data = _data; }
295
296#define EndSubBitUnion(name) } name;
297
298//Regular read/write bitfields
299#define BitfieldRW(first, last) _BitfieldRW<__DataType, first, last>
300#define SubBitUnionRW(name, first, last) \
301 __SubBitUnion(BitfieldRW(first, last), name)
302#define Bitfield(first, last) BitfieldRW(first, last)
303#define SubBitUnion(name, first, last) SubBitUnionRW(name, first, last)
304
305//Read only bitfields
306#define BitfieldRO(first, last) _BitfieldRO<__DataType, first, last>
307#define SubBitUnionRO(name, first, last) \
308 __SubBitUnion(BitfieldRO(first, last), name)
309
310//Write only bitfields
311#define BitfieldWO(first, last) _BitfieldWO<__DataType, first, last>
312#define SubBitUnionWO(name, first, last) \
313 __SubBitUnion(BitfieldWO(first, last), name)
314
315#define BitUnion(type, name) __BitUnion(type, name)
316
317#define BitUnion64(name) __BitUnion(uint64_t, name)
318#define BitUnion32(name) __BitUnion(uint32_t, name)
319#define BitUnion16(name) __BitUnion(uint16_t, name)
320#define BitUnion8(name) __BitUnion(uint8_t, name)
321
135#endif // __BASE_BITFIELD_HH__
322#endif // __BASE_BITFIELD_HH__