2 * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 FILE_LICENCE ( GPL2_OR_LATER );
25 #include <ipxe/init.h>
26 #include <ipxe/settings.h>
33 * Memory map settings are numerically encoded as:
35 * Bits 31-24 Number of regions, minus one
36 * Bits 23-16 Starting region
38 * Bit 10 Ignore non-existent regions (rather than generating an error)
39 * Bit 9 Include length
40 * Bit 8 Include start address
42 * Bits 5-0 Scale factor (i.e. right shift count)
46 * Construct memory map setting tag
48 * @v start Starting region
49 * @v count Number of regions
50 * @v include_start Include start address
51 * @v include_length Include length
52 * @v ignore Ignore non-existent regions
53 * @v scale Scale factor
54 * @ret tag Setting tag
56 #define MEMMAP_TAG( start, count, include_start, include_length, \
58 ( ( (start) << 16 ) | ( ( (count) - 1 ) << 24 ) | \
59 ( (ignore) << 10 ) | ( (include_length) << 9 ) | \
60 ( (include_start) << 8 ) | (scale) )
63 * Extract number of regions from setting tag
66 * @ret count Number of regions
68 #define MEMMAP_COUNT( tag ) ( ( ( (tag) >> 24 ) & 0xff ) + 1 )
71 * Extract starting region from setting tag
74 * @ret start Starting region
76 #define MEMMAP_START( tag ) ( ( (tag) >> 16 ) & 0xff )
79 * Extract ignore flag from setting tag
82 * @ret ignore Ignore non-existent regions
84 #define MEMMAP_IGNORE_NONEXISTENT( tag ) ( (tag) & 0x00000400UL )
87 * Extract length inclusion flag from setting tag
90 * @ret include_length Include length
92 #define MEMMAP_INCLUDE_LENGTH( tag ) ( (tag) & 0x00000200UL )
95 * Extract start address inclusion flag from setting tag
98 * @ret include_start Include start address
100 #define MEMMAP_INCLUDE_START( tag ) ( (tag) & 0x00000100UL )
103 * Extract scale factor from setting tag
106 * @v scale Scale factor
108 #define MEMMAP_SCALE( tag ) ( (tag) & 0x3f )
110 /** Memory map settings scope */
111 static const struct settings_scope memmap_settings_scope;
114 * Check applicability of memory map setting
116 * @v settings Settings block
118 * @ret applies Setting applies within this settings block
120 static int memmap_settings_applies ( struct settings *settings __unused,
121 const struct setting *setting ) {
123 return ( setting->scope == &memmap_settings_scope );
127 * Fetch value of memory map setting
129 * @v settings Settings block
130 * @v setting Setting to fetch
131 * @v data Buffer to fill with setting data
132 * @v len Length of buffer
133 * @ret len Length of setting data, or negative error
135 static int memmap_settings_fetch ( struct settings *settings,
136 struct setting *setting,
137 void *data, size_t len ) {
138 struct memory_map memmap;
139 struct memory_region *region;
144 DBGC ( settings, "MEMMAP start %d count %d %s%s%s%s scale %d\n",
145 MEMMAP_START ( setting->tag ), MEMMAP_COUNT ( setting->tag ),
146 ( MEMMAP_INCLUDE_START ( setting->tag ) ? "start" : "" ),
147 ( ( MEMMAP_INCLUDE_START ( setting->tag ) &&
148 MEMMAP_INCLUDE_LENGTH ( setting->tag ) ) ? "+" : "" ),
149 ( MEMMAP_INCLUDE_LENGTH ( setting->tag ) ? "length" : "" ),
150 ( MEMMAP_IGNORE_NONEXISTENT ( setting->tag ) ? " ignore" : "" ),
151 MEMMAP_SCALE ( setting->tag ) );
153 /* Fetch memory map */
154 get_memmap ( &memmap );
156 /* Extract results from memory map */
157 count = MEMMAP_COUNT ( setting->tag );
158 for ( i = MEMMAP_START ( setting->tag ) ; count-- ; i++ ) {
160 /* Check that region exists */
161 if ( i >= memmap.count ) {
162 if ( MEMMAP_IGNORE_NONEXISTENT ( setting->tag ) ) {
165 DBGC ( settings, "MEMMAP region %d does not "
171 /* Extract results from this region */
172 region = &memmap.regions[i];
173 if ( MEMMAP_INCLUDE_START ( setting->tag ) ) {
174 result += region->start;
175 DBGC ( settings, "MEMMAP %d start %08llx\n",
178 if ( MEMMAP_INCLUDE_LENGTH ( setting->tag ) ) {
179 result += ( region->end - region->start );
180 DBGC ( settings, "MEMMAP %d length %08llx\n",
181 i, ( region->end - region->start ) );
186 result >>= MEMMAP_SCALE ( setting->tag );
189 result = cpu_to_be64 ( result );
190 if ( len > sizeof ( result ) )
191 len = sizeof ( result );
192 memcpy ( data, &result, len );
194 /* Set type if not already specified */
195 if ( ! setting->type )
196 setting->type = &setting_type_hexraw;
198 return sizeof ( result );
201 /** Memory map settings operations */
202 static struct settings_operations memmap_settings_operations = {
203 .applies = memmap_settings_applies,
204 .fetch = memmap_settings_fetch,
207 /** Memory map settings */
208 static struct settings memmap_settings = {
210 .siblings = LIST_HEAD_INIT ( memmap_settings.siblings ),
211 .children = LIST_HEAD_INIT ( memmap_settings.children ),
212 .op = &memmap_settings_operations,
213 .default_scope = &memmap_settings_scope,
216 /** Initialise memory map settings */
217 static void memmap_settings_init ( void ) {
220 if ( ( rc = register_settings ( &memmap_settings, NULL,
221 "memmap" ) ) != 0 ) {
222 DBG ( "MEMMAP could not register settings: %s\n",
228 /** Memory map settings initialiser */
229 struct init_fn memmap_settings_init_fn __init_fn ( INIT_NORMAL ) = {
230 .initialise = memmap_settings_init,
233 /** Memory map predefined settings */
234 const struct setting memsize_setting __setting ( SETTING_MISC, memsize ) = {
236 .description = "Memory size (in MB)",
237 .tag = MEMMAP_TAG ( 0, 0x100, 0, 1, 1, 20 ),
238 .type = &setting_type_int32,
239 .scope = &memmap_settings_scope,