-
Notifications
You must be signed in to change notification settings - Fork 164
/
io.h
374 lines (338 loc) · 11.6 KB
/
io.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
/*
* Copyright (c) 2015 - 2017, Xilinx Inc. and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* @file io.h
* @brief I/O access primitives for libmetal.
*/
#ifndef __METAL_IO__H__
#define __METAL_IO__H__
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <metal/assert.h>
#include <metal/compiler.h>
#include <metal/atomic.h>
#include <metal/sys.h>
#include <metal/cpu.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup io IO Interfaces
* @{
*/
#ifdef __MICROBLAZE__
#define NO_ATOMIC_64_SUPPORT
#endif
struct metal_io_region;
/** Generic I/O operations. */
struct metal_io_ops {
uint64_t (*read)(struct metal_io_region *io,
unsigned long offset,
memory_order order,
int width);
void (*write)(struct metal_io_region *io,
unsigned long offset,
uint64_t value,
memory_order order,
int width);
int (*block_read)(struct metal_io_region *io,
unsigned long offset,
void *restrict dst,
memory_order order,
int len);
int (*block_write)(struct metal_io_region *io,
unsigned long offset,
const void *restrict src,
memory_order order,
int len);
void (*block_set)(struct metal_io_region *io,
unsigned long offset,
unsigned char value,
memory_order order,
int len);
void (*close)(struct metal_io_region *io);
metal_phys_addr_t (*offset_to_phys)(struct metal_io_region *io,
unsigned long offset);
unsigned long (*phys_to_offset)(struct metal_io_region *io,
metal_phys_addr_t phys);
};
/** Libmetal I/O region structure. */
struct metal_io_region {
void *virt; /**< base virtual address */
const metal_phys_addr_t *physmap; /**< table of base physical address
of each of the pages in the I/O
region */
size_t size; /**< size of the I/O region */
unsigned long page_shift; /**< page shift of I/O region */
metal_phys_addr_t page_mask; /**< page mask of I/O region */
unsigned int mem_flags; /**< memory attribute of the
I/O region */
struct metal_io_ops ops; /**< I/O region operations */
};
/**
* @brief Open a libmetal I/O region.
*
* @param[in, out] io I/O region handle.
* @param[in] virt Virtual address of region.
* @param[in] physmap Array of physical addresses per page.
* @param[in] size Size of region.
* @param[in] page_shift Log2 of page size (-1 for single page).
* @param[in] mem_flags Memory flags
* @param[in] ops ops
*/
void
metal_io_init(struct metal_io_region *io, void *virt,
const metal_phys_addr_t *physmap, size_t size,
unsigned int page_shift, unsigned int mem_flags,
const struct metal_io_ops *ops);
/**
* @brief Close a libmetal shared memory segment.
* @param[in] io I/O region handle.
*/
static inline void metal_io_finish(struct metal_io_region *io)
{
if (io->ops.close)
(*io->ops.close)(io);
memset(io, 0, sizeof(*io));
}
/**
* @brief Get size of I/O region.
*
* @param[in] io I/O region handle.
* @return Size of I/O region.
*/
static inline size_t metal_io_region_size(struct metal_io_region *io)
{
return io->size;
}
/**
* @brief Get virtual address for a given offset into the I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into shared memory segment.
* @return NULL if offset is out of range, or pointer to offset.
*/
static inline void *
metal_io_virt(struct metal_io_region *io, unsigned long offset)
{
return (io->virt != METAL_BAD_VA && offset < io->size
? (uint8_t *)io->virt + offset
: NULL);
}
/**
* @brief Convert a virtual address to offset within I/O region.
* @param[in] io I/O region handle.
* @param[in] virt Virtual address within segment.
* @return METAL_BAD_OFFSET if out of range, or offset.
*/
static inline unsigned long
metal_io_virt_to_offset(struct metal_io_region *io, void *virt)
{
size_t offset = (uint8_t *)virt - (uint8_t *)io->virt;
return (offset < io->size ? offset : METAL_BAD_OFFSET);
}
/**
* @brief Get physical address for a given offset into the I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into shared memory segment.
* @return METAL_BAD_PHYS if offset is out of range, or physical address
* of offset.
*/
static inline metal_phys_addr_t
metal_io_phys(struct metal_io_region *io, unsigned long offset)
{
if (!io->ops.offset_to_phys) {
unsigned long page = (io->page_shift >=
sizeof(offset) * CHAR_BIT ?
0 : offset >> io->page_shift);
return (io->physmap && offset < io->size
? io->physmap[page] + (offset & io->page_mask)
: METAL_BAD_PHYS);
}
return io->ops.offset_to_phys(io, offset);
}
/**
* @brief Convert a physical address to offset within I/O region.
* @param[in] io I/O region handle.
* @param[in] phys Physical address within segment.
* @return METAL_BAD_OFFSET if out of range, or offset.
*/
static inline unsigned long
metal_io_phys_to_offset(struct metal_io_region *io, metal_phys_addr_t phys)
{
if (!io->ops.phys_to_offset) {
unsigned long offset =
(io->page_mask == (metal_phys_addr_t)(-1) ?
phys - io->physmap[0] : phys & io->page_mask);
do {
if (metal_io_phys(io, offset) == phys)
return offset;
offset += io->page_mask + 1;
} while (offset < io->size);
return METAL_BAD_OFFSET;
}
return (*io->ops.phys_to_offset)(io, phys);
}
/**
* @brief Convert a physical address to virtual address.
* @param[in] io Shared memory segment handle.
* @param[in] phys Physical address within segment.
* @return NULL if out of range, or corresponding virtual address.
*/
static inline void *
metal_io_phys_to_virt(struct metal_io_region *io, metal_phys_addr_t phys)
{
return metal_io_virt(io, metal_io_phys_to_offset(io, phys));
}
/**
* @brief Convert a virtual address to physical address.
* @param[in] io Shared memory segment handle.
* @param[in] virt Virtual address within segment.
* @return METAL_BAD_PHYS if out of range, or corresponding
* physical address.
*/
static inline metal_phys_addr_t
metal_io_virt_to_phys(struct metal_io_region *io, void *virt)
{
return metal_io_phys(io, metal_io_virt_to_offset(io, virt));
}
/**
* @brief Read a value from an I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into I/O region.
* @param[in] order Memory ordering.
* @param[in] width Width in bytes of datatype to read. This must be 1, 2,
* 4, or 8, and a compile time constant for this function
* to inline cleanly.
* @return Value.
*/
static inline uint64_t
metal_io_read(struct metal_io_region *io, unsigned long offset,
memory_order order, int width)
{
void *ptr = metal_io_virt(io, offset);
if (io->ops.read)
return (*io->ops.read)(io, offset, order, width);
else if (ptr && sizeof(atomic_uchar) == width)
return atomic_load_explicit((atomic_uchar *)ptr, order);
else if (ptr && sizeof(atomic_ushort) == width)
return atomic_load_explicit((atomic_ushort *)ptr, order);
else if (ptr && sizeof(atomic_uint) == width)
return atomic_load_explicit((atomic_uint *)ptr, order);
else if (ptr && sizeof(atomic_ulong) == width)
return atomic_load_explicit((atomic_ulong *)ptr, order);
#ifndef NO_ATOMIC_64_SUPPORT
else if (ptr && sizeof(atomic_ullong) == width)
return atomic_load_explicit((atomic_ullong *)ptr, order);
#endif
metal_assert(0);
return 0; /* quiet compiler */
}
/**
* @brief Write a value into an I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into I/O region.
* @param[in] value Value to write.
* @param[in] order Memory ordering.
* @param[in] width Width in bytes of datatype to read. This must be 1, 2,
* 4, or 8, and a compile time constant for this function
* to inline cleanly.
*/
static inline void
metal_io_write(struct metal_io_region *io, unsigned long offset,
uint64_t value, memory_order order, int width)
{
void *ptr = metal_io_virt(io, offset);
if (io->ops.write)
(*io->ops.write)(io, offset, value, order, width);
else if (ptr && sizeof(atomic_uchar) == width)
atomic_store_explicit((atomic_uchar *)ptr, (unsigned char)value,
order);
else if (ptr && sizeof(atomic_ushort) == width)
atomic_store_explicit((atomic_ushort *)ptr,
(unsigned short)value, order);
else if (ptr && sizeof(atomic_uint) == width)
atomic_store_explicit((atomic_uint *)ptr, (unsigned int)value,
order);
else if (ptr && sizeof(atomic_ulong) == width)
atomic_store_explicit((atomic_ulong *)ptr, (unsigned long)value,
order);
#ifndef NO_ATOMIC_64_SUPPORT
else if (ptr && sizeof(atomic_ullong) == width)
atomic_store_explicit((atomic_ullong *)ptr,
(unsigned long long)value, order);
#endif
else
metal_assert(0);
}
#define metal_io_read8_explicit(_io, _ofs, _order) \
metal_io_read((_io), (_ofs), (_order), 1)
#define metal_io_read8(_io, _ofs) \
metal_io_read((_io), (_ofs), memory_order_seq_cst, 1)
#define metal_io_write8_explicit(_io, _ofs, _val, _order) \
metal_io_write((_io), (_ofs), (_val), (_order), 1)
#define metal_io_write8(_io, _ofs, _val) \
metal_io_write((_io), (_ofs), (_val), memory_order_seq_cst, 1)
#define metal_io_read16_explicit(_io, _ofs, _order) \
metal_io_read((_io), (_ofs), (_order), 2)
#define metal_io_read16(_io, _ofs) \
metal_io_read((_io), (_ofs), memory_order_seq_cst, 2)
#define metal_io_write16_explicit(_io, _ofs, _val, _order) \
metal_io_write((_io), (_ofs), (_val), (_order), 2)
#define metal_io_write16(_io, _ofs, _val) \
metal_io_write((_io), (_ofs), (_val), memory_order_seq_cst, 2)
#define metal_io_read32_explicit(_io, _ofs, _order) \
metal_io_read((_io), (_ofs), (_order), 4)
#define metal_io_read32(_io, _ofs) \
metal_io_read((_io), (_ofs), memory_order_seq_cst, 4)
#define metal_io_write32_explicit(_io, _ofs, _val, _order) \
metal_io_write((_io), (_ofs), (_val), (_order), 4)
#define metal_io_write32(_io, _ofs, _val) \
metal_io_write((_io), (_ofs), (_val), memory_order_seq_cst, 4)
#define metal_io_read64_explicit(_io, _ofs, _order) \
metal_io_read((_io), (_ofs), (_order), 8)
#define metal_io_read64(_io, _ofs) \
metal_io_read((_io), (_ofs), memory_order_seq_cst, 8)
#define metal_io_write64_explicit(_io, _ofs, _val, _order) \
metal_io_write((_io), (_ofs), (_val), (_order), 8)
#define metal_io_write64(_io, _ofs, _val) \
metal_io_write((_io), (_ofs), (_val), memory_order_seq_cst, 8)
/**
* @brief Read a block from an I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into I/O region.
* @param[in] dst destination to store the read data.
* @param[in] len length in bytes to read.
* @return On success, number of bytes read. On failure, negative value
*/
int metal_io_block_read(struct metal_io_region *io, unsigned long offset,
void *restrict dst, int len);
/**
* @brief Write a block into an I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into I/O region.
* @param[in] src source to write.
* @param[in] len length in bytes to write.
* @return On success, number of bytes written. On failure, negative value
*/
int metal_io_block_write(struct metal_io_region *io, unsigned long offset,
const void *restrict src, int len);
/**
* @brief fill a block of an I/O region.
* @param[in] io I/O region handle.
* @param[in] offset Offset into I/O region.
* @param[in] value value to fill into the block
* @param[in] len length in bytes to fill.
* @return On success, number of bytes filled. On failure, negative value
*/
int metal_io_block_set(struct metal_io_region *io, unsigned long offset,
unsigned char value, int len);
#include <metal/system/@PROJECT_SYSTEM@/io.h>
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* __METAL_IO__H__ */