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
|
/**************************************************************************
*
* Copyright 2010 Pauli Nieminen.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*
**************************************************************************/
/*
* Multipart buffer for coping data which is larger than the page size.
*
* Authors:
* Pauli Nieminen <suokkos-at-gmail-dot-com>
*/
#ifndef _DRM_BUFFER_H_
#define _DRM_BUFFER_H_
#include "drmP.h"
struct drm_buffer {
int iterator;
int size;
char *data[];
};
/**
* Return the index of page that buffer is currently pointing at.
*/
static inline int drm_buffer_page(struct drm_buffer *buf)
{
return buf->iterator / PAGE_SIZE;
}
/**
* Return the index of the current byte in the page
*/
static inline int drm_buffer_index(struct drm_buffer *buf)
{
return buf->iterator & (PAGE_SIZE - 1);
}
/**
* Return number of bytes that is left to process
*/
static inline int drm_buffer_unprocessed(struct drm_buffer *buf)
{
return buf->size - buf->iterator;
}
/**
* Advance the buffer iterator number of bytes that is given.
*/
static inline void drm_buffer_advance(struct drm_buffer *buf, int bytes)
{
buf->iterator += bytes;
}
/**
* Allocate the drm buffer object.
*
* buf: A pointer to a pointer where the object is stored.
* size: The number of bytes to allocate.
*/
extern int drm_buffer_alloc(struct drm_buffer **buf, int size);
/**
* Copy the user data to the begin of the buffer and reset the processing
* iterator.
*
* user_data: A pointer the data that is copied to the buffer.
* size: The Number of bytes to copy.
*/
extern int drm_buffer_copy_from_user(struct drm_buffer *buf,
void __user *user_data, int size);
/**
* Free the drm buffer object
*/
extern void drm_buffer_free(struct drm_buffer *buf);
/**
* Read an object from buffer that may be split to multiple parts. If object
* is not split function just returns the pointer to object in buffer. But in
* case of split object data is copied to given stack object that is suplied
* by caller.
*
* The processing location of the buffer is also advanced to the next byte
* after the object.
*
* objsize: The size of the objet in bytes.
* stack_obj: A pointer to a memory location where object can be copied.
*/
extern void *drm_buffer_read_object(struct drm_buffer *buf,
int objsize, void *stack_obj);
/**
* Returns the pointer to the dword which is offset number of elements from the
* current processing location.
*
* Caller must make sure that dword is not split in the buffer. This
* requirement is easily met if all the sizes of objects in buffer are
* multiples of dword and PAGE_SIZE is multiple dword.
*
* Call to this function doesn't change the processing location.
*
* offset: The index of the dword relative to the internat iterator.
*/
static inline void *drm_buffer_pointer_to_dword(struct drm_buffer *buffer,
int offset)
{
int iter = buffer->iterator + offset * 4;
return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)];
}
/**
* Returns the pointer to the dword which is offset number of elements from
* the current processing location.
*
* Call to this function doesn't change the processing location.
*
* offset: The index of the byte relative to the internat iterator.
*/
static inline void *drm_buffer_pointer_to_byte(struct drm_buffer *buffer,
int offset)
{
int iter = buffer->iterator + offset;
return &buffer->data[iter / PAGE_SIZE][iter & (PAGE_SIZE - 1)];
}
#endif
|
