2 * Copyright (c) 2015-2016 Landon Fuller <landonf@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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32 #ifndef _BHND_NVRAM_BHND_NVRAM_SPROMVAR_H_
33 #define _BHND_NVRAM_BHND_NVRAM_SPROMVAR_H_
36 #include <sys/bitstring.h>
38 #include <bitstring.h>
41 #include "bhnd_nvram_private.h"
43 #include "bhnd_nvram_datavar.h"
44 #include "bhnd_nvram_io.h"
46 /** The maximum number of array elements encoded in a single SPROM variable */
47 #define BHND_SPROM_ARRAY_MAXLEN 12
49 typedef struct bhnd_sprom_opcode_state bhnd_sprom_opcode_state;
50 typedef struct bhnd_sprom_opcode_bind bhnd_sprom_opcode_bind;
51 typedef struct bhnd_sprom_opcode_var bhnd_sprom_opcode_var;
52 typedef struct bhnd_sprom_opcode_idx_entry bhnd_sprom_opcode_idx_entry;
54 int bhnd_sprom_opcode_init(
55 bhnd_sprom_opcode_state *state,
56 const bhnd_sprom_layout *layout);
57 void bhnd_sprom_opcode_fini(
58 bhnd_sprom_opcode_state *state);
60 bhnd_sprom_opcode_idx_entry *bhnd_sprom_opcode_index_find(
61 bhnd_sprom_opcode_state *state,
63 bhnd_sprom_opcode_idx_entry *bhnd_sprom_opcode_index_next(
64 bhnd_sprom_opcode_state *state,
65 bhnd_sprom_opcode_idx_entry *prev);
67 int bhnd_sprom_opcode_parse_var(
68 bhnd_sprom_opcode_state *state,
69 bhnd_sprom_opcode_idx_entry *entry);
71 int bhnd_sprom_opcode_seek(
72 bhnd_sprom_opcode_state *state,
73 bhnd_sprom_opcode_idx_entry *entry);
74 int bhnd_sprom_opcode_next_binding(
75 bhnd_sprom_opcode_state *state);
76 int bhnd_sprom_opcode_apply_scale(
77 bhnd_sprom_opcode_state *state,
81 * SPROM opcode per-bind evaluation state.
83 struct bhnd_sprom_opcode_bind {
85 uint32_t skip_in; /**< input element skips */
86 bool skip_in_negative; /**< skip_in should be subtracted */
87 uint32_t skip_out; /**< output element skip */
91 * SPROM opcode per-variable evaluation state.
93 struct bhnd_sprom_opcode_var {
94 uint8_t nelem; /**< variable array length */
95 uint32_t mask; /**< current bind input mask */
96 int8_t shift; /**< current bind input shift */
97 bhnd_nvram_type base_type; /**< current bind input type */
98 uint32_t scale; /**< current scale to apply to scaled encodings */
99 bhnd_sprom_opcode_bind bind; /**< current bind state */
100 bool have_bind; /**< if bind state is defined */
101 size_t bind_total; /**< total count of bind operations performed */
105 * SPROM opcode variable definition states.
107 * Ordered to support inequality comparisons
108 * (e.g. >= SPROM_OPCODE_VAR_STATE_OPEN)
111 SPROM_OPCODE_VAR_STATE_NONE = 1, /**< no variable entry available */
112 SPROM_OPCODE_VAR_STATE_OPEN = 2, /**< currently parsing a variable entry */
113 SPROM_OPCODE_VAR_STATE_DONE = 3 /**< full variable entry has been parsed */
114 } bhnd_sprom_opcode_var_state;
117 * SPROM opcode evaluation state
119 struct bhnd_sprom_opcode_state {
120 const bhnd_sprom_layout *layout; /**< SPROM layout */
122 bhnd_sprom_opcode_idx_entry *idx; /**< variable index (NULL during initialization) */
123 size_t num_idx; /**< variable index entry count */
125 /** Current SPROM revision range */
126 bitstr_t bit_decl(revs, SPROM_OP_REV_MAX);
128 const uint8_t *input; /**< opcode input position */
130 /* State preserved across variable definitions */
131 uint32_t offset; /**< SPROM offset */
132 size_t vid; /**< Variable ID */
134 /* State reset after end of each variable definition */
135 bhnd_sprom_opcode_var var; /**< variable record (if any) */
136 bhnd_sprom_opcode_var_state var_state; /**< variable record state */
140 * SPROM opcode variable index entry
142 struct bhnd_sprom_opcode_idx_entry {
143 uint16_t vid; /**< SPROM variable ID */
144 uint16_t offset; /**< SPROM input offset */
145 uint16_t opcodes; /**< SPROM opcode offset */
149 * SPROM value storage.
151 * Sufficient for representing the native encoding of any defined SPROM
154 union bhnd_nvram_sprom_storage {
155 uint8_t u8[BHND_SPROM_ARRAY_MAXLEN];
156 uint16_t u16[BHND_SPROM_ARRAY_MAXLEN];
157 uint32_t u32[BHND_SPROM_ARRAY_MAXLEN];
158 int8_t i8[BHND_SPROM_ARRAY_MAXLEN];
159 int16_t i16[BHND_SPROM_ARRAY_MAXLEN];
160 int32_t i32[BHND_SPROM_ARRAY_MAXLEN];
161 char ch[BHND_SPROM_ARRAY_MAXLEN];
165 * SPROM data class instance state.
167 struct bhnd_nvram_sprom {
168 struct bhnd_nvram_data nv; /**< common instance state */
169 struct bhnd_nvram_io *data; /**< backing SPROM image */
170 const bhnd_sprom_layout *layout; /**< layout definition */
171 bhnd_sprom_opcode_state state; /**< opcode eval state */
174 #endif /* _BHND_NVRAM_BHND_NVRAM_SPROMVAR_H_ */