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1 /*-
2  * Copyright (c) 2016 Landon Fuller <landonf@FreeBSD.org>
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
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer,
10  *    without modification.
11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13  *    redistribution must be conditioned upon including a substantially
14  *    similar Disclaimer requirement for further binary redistribution.
15  *
16  * NO WARRANTY
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27  * THE POSSIBILITY OF SUCH DAMAGES.
28  * 
29  * $FreeBSD$
30  */
31
32 #ifndef _BHND_NVRAM_BHND_NVRAM_DATAVAR_H_
33 #define _BHND_NVRAM_BHND_NVRAM_DATAVAR_H_
34
35 #include <sys/param.h>
36 #include <sys/linker_set.h>
37 #include <sys/refcount.h>
38
39 #include "bhnd_nvram_io.h"
40
41 #include "bhnd_nvram_data.h"
42
43 /** Registered NVRAM parser class instances. */
44 SET_DECLARE(bhnd_nvram_data_class_set, bhnd_nvram_data_class);
45
46 void                    *bhnd_nvram_data_generic_find(
47                              struct bhnd_nvram_data *nv, const char *name);
48 int                      bhnd_nvram_data_generic_rp_getvar(
49                              struct bhnd_nvram_data *nv, void *cookiep,
50                              void *outp, size_t *olen, bhnd_nvram_type otype);
51 int                      bhnd_nvram_data_generic_rp_copy_val(
52                              struct bhnd_nvram_data *nv, void *cookiep,
53                              bhnd_nvram_val **val);
54
55 /** @see bhnd_nvram_data_probe() */
56 typedef int              (bhnd_nvram_data_op_probe)(struct bhnd_nvram_io *io);
57
58 /** @see bhnd_nvram_data_probe() */
59 typedef int              (bhnd_nvram_data_op_getvar_direct)(
60                               struct bhnd_nvram_io *io, const char *name,
61                               void *outp, size_t *olen, bhnd_nvram_type otype);
62
63 /** @see bhnd_nvram_data_serialize() */
64 typedef int              (bhnd_nvram_data_op_serialize)(
65                               bhnd_nvram_data_class *cls,
66                               bhnd_nvram_plist *props,
67                               bhnd_nvram_plist *options, void *outp,
68                               size_t *olen);
69
70 /** @see bhnd_nvram_data_new() */
71 typedef int              (bhnd_nvram_data_op_new)(struct bhnd_nvram_data *nv,
72                               struct bhnd_nvram_io *io);
73
74 /** Free all resources associated with @p nv. Called by
75  *  bhnd_nvram_data_release() when the reference count reaches zero. */
76 typedef void             (bhnd_nvram_data_op_free)(struct bhnd_nvram_data *nv);
77
78 /** @see bhnd_nvram_data_count() */
79 typedef size_t           (bhnd_nvram_data_op_count)(struct bhnd_nvram_data *nv);
80
81 /** @see bhnd_nvram_data_options() */
82 typedef bhnd_nvram_plist*(bhnd_nvram_data_op_options)(
83                               struct bhnd_nvram_data *nv);
84
85 /** @see bhnd_nvram_data_caps() */
86 typedef uint32_t         (bhnd_nvram_data_op_caps)(struct bhnd_nvram_data *nv);
87
88 /** @see bhnd_nvram_data_next() */
89 typedef const char      *(bhnd_nvram_data_op_next)(struct bhnd_nvram_data *nv,
90                               void **cookiep);
91
92 /** @see bhnd_nvram_data_find() */
93 typedef void            *(bhnd_nvram_data_op_find)(struct bhnd_nvram_data *nv,
94                               const char *name);
95
96 /** @see bhnd_nvram_data_copy_val() */
97 typedef int              (bhnd_nvram_data_op_copy_val)(
98                               struct bhnd_nvram_data *nv, void *cookiep,
99                               bhnd_nvram_val **value);
100
101 /** @see bhnd_nvram_data_getvar_order() */
102 typedef int              (bhnd_nvram_data_op_getvar_order)(
103                               struct bhnd_nvram_data *nv, void *cookiep1,
104                               void *cookiep2);
105
106 /** @see bhnd_nvram_data_getvar_name() */
107 typedef const char      *(bhnd_nvram_data_op_getvar_name)(
108                               struct bhnd_nvram_data *nv,
109                               void *cookiep);
110
111 /** @see bhnd_nvram_data_getvar() */
112 typedef int              (bhnd_nvram_data_op_getvar)(struct bhnd_nvram_data *nv,
113                               void *cookiep, void *buf, size_t *len,
114                               bhnd_nvram_type type);
115
116 /** @see bhnd_nvram_data_getvar_ptr() */
117 typedef const void      *(bhnd_nvram_data_op_getvar_ptr)(
118                               struct bhnd_nvram_data *nv, void *cookiep,
119                               size_t *len, bhnd_nvram_type *type);
120
121 /** @see bhnd_nvram_data_filter_setvar() */
122 typedef int              (bhnd_nvram_data_op_filter_setvar)(
123                               struct bhnd_nvram_data *nv, const char *name,
124                               bhnd_nvram_val *value, bhnd_nvram_val **result);
125
126 /** @see bhnd_nvram_data_filter_unsetvar() */
127 typedef int              (bhnd_nvram_data_op_filter_unsetvar)(
128                               struct bhnd_nvram_data *nv, const char *name);
129
130 /**
131  * NVRAM data class.
132  */
133 struct bhnd_nvram_data_class {
134         const char                      *desc;          /**< description */
135         uint32_t                         caps;          /**< capabilities (BHND_NVRAM_DATA_CAP_*) */
136         size_t                           size;          /**< instance size */
137
138         bhnd_nvram_data_op_probe                *op_probe;
139         bhnd_nvram_data_op_getvar_direct        *op_getvar_direct;
140         bhnd_nvram_data_op_serialize            *op_serialize;
141         bhnd_nvram_data_op_new                  *op_new;
142         bhnd_nvram_data_op_free                 *op_free;
143         bhnd_nvram_data_op_count                *op_count;
144         bhnd_nvram_data_op_options              *op_options;
145         bhnd_nvram_data_op_caps                 *op_caps;
146         bhnd_nvram_data_op_next                 *op_next;
147         bhnd_nvram_data_op_find                 *op_find;
148         bhnd_nvram_data_op_copy_val             *op_copy_val;
149         bhnd_nvram_data_op_getvar_order         *op_getvar_order;
150         bhnd_nvram_data_op_getvar               *op_getvar;
151         bhnd_nvram_data_op_getvar_ptr           *op_getvar_ptr;
152         bhnd_nvram_data_op_getvar_name          *op_getvar_name;
153         bhnd_nvram_data_op_filter_setvar        *op_filter_setvar;
154         bhnd_nvram_data_op_filter_unsetvar      *op_filter_unsetvar;
155 };
156
157 /**
158  * NVRAM data instance.
159  */
160 struct bhnd_nvram_data {
161         struct bhnd_nvram_data_class    *cls;
162         volatile u_int                   refs;
163 };
164
165 /*
166  * Helper macro for BHND_NVRAM_DATA_CLASS_DEFN().
167  *
168  * Declares a bhnd_nvram_data_class method implementation with class name
169  * _cname and method name _mname
170  */
171 #define BHND_NVRAM_DATA_CLASS_DECL_METHOD(_cname, _mname)               \
172         static bhnd_nvram_data_op_ ## _mname                            \
173             bhnd_nvram_ ## _cname ## _ ## _mname;                       \
174
175 /*
176  * Helper macro for BHND_NVRAM_DATA_CLASS_DEFN().
177  *
178  * Assign a bhnd_nvram_data_class method implementation with class name
179  * @p _cname and method name @p _mname
180  */
181 #define BHND_NVRAM_DATA_CLASS_ASSIGN_METHOD(_cname, _mname)             \
182         .op_ ## _mname = bhnd_nvram_ ## _cname ## _ ## _mname,
183
184 /*
185  * Helper macro for BHND_NVRAM_DATA_CLASS_DEFN().
186  *
187  * Iterate over all bhnd_nvram_data_class method names, calling
188  * _macro with the class name _cname as the first argument, and
189  * a bhnd_nvram_data_class method name as the second.
190  */
191 #define BHND_NVRAM_DATA_CLASS_ITER_METHODS(_cname, _macro)      \
192         _macro(_cname, probe)                                   \
193         _macro(_cname, getvar_direct)                           \
194         _macro(_cname, serialize)                               \
195         _macro(_cname, new)                                     \
196         _macro(_cname, free)                                    \
197         _macro(_cname, count)                                   \
198         _macro(_cname, options)                                 \
199         _macro(_cname, caps)                                    \
200         _macro(_cname, next)                                    \
201         _macro(_cname, find)                                    \
202         _macro(_cname, copy_val)                                \
203         _macro(_cname, getvar_order)                            \
204         _macro(_cname, getvar)                                  \
205         _macro(_cname, getvar_ptr)                              \
206         _macro(_cname, getvar_name)                             \
207         _macro(_cname, filter_setvar)                           \
208         _macro(_cname, filter_unsetvar)
209
210 /**
211  * Define a bhnd_nvram_data_class with class name @p _n and description
212  * @p _desc, and register with bhnd_nvram_data_class_set.
213  */
214 #define BHND_NVRAM_DATA_CLASS_DEFN(_cname, _desc, _caps, _size)         \
215         BHND_NVRAM_DATA_CLASS_ITER_METHODS(_cname,                      \
216             BHND_NVRAM_DATA_CLASS_DECL_METHOD)                          \
217                                                                         \
218         struct bhnd_nvram_data_class bhnd_nvram_## _cname ## _class = { \
219                 .desc           = (_desc),                              \
220                 .caps           = (_caps),                              \
221                 .size           = (_size),                              \
222                 BHND_NVRAM_DATA_CLASS_ITER_METHODS(_cname,              \
223                     BHND_NVRAM_DATA_CLASS_ASSIGN_METHOD)                \
224         };                                                              \
225                                                                         \
226         DATA_SET(bhnd_nvram_data_class_set,                             \
227             bhnd_nvram_## _cname ## _class);
228
229 #endif /* _BHND_NVRAM_BHND_NVRAM_DATAVAR_H_ */