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+/*
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+ * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of the
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+ * License, or any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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+ * 02110-1301, USA.
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+ */
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+
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+FILE_LICENCE ( GPL2_OR_LATER );
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+
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+#include <string.h>
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+#include <errno.h>
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+#include <byteswap.h>
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+#include <ipxe/init.h>
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+#include <ipxe/settings.h>
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+#include <ipxe/io.h>
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+
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+/** @file
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+ *
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+ * Memory map settings
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+ *
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+ * Memory map settings are numerically encoded as:
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+ *
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+ * Bits 31-24 Number of regions, minus one
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+ * Bits 23-16 Starting region
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+ * Bits 15-11 Unused
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+ * Bit 10 Ignore non-existent regions (rather than generating an error)
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+ * Bit 9 Include length
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+ * Bit 8 Include start address
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+ * Bits 7-6 Unused
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+ * Bits 5-0 Scale factor (i.e. right shift count)
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+ */
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+
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+/**
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+ * Construct memory map setting tag
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+ *
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+ * @v start Starting region
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+ * @v count Number of regions
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+ * @v include_start Include start address
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+ * @v include_length Include length
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+ * @v ignore Ignore non-existent regions
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+ * @v scale Scale factor
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+ * @ret tag Setting tag
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+ */
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+#define MEMMAP_TAG( start, count, include_start, include_length, \
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+ ignore, scale ) \
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+ ( ( (start) << 16 ) | ( ( (count) - 1 ) << 24 ) | \
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+ ( (ignore) << 10 ) | ( (include_length) << 9 ) | \
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+ ( (include_start) << 8 ) | (scale) )
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+
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+/**
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+ * Extract number of regions from setting tag
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+ *
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+ * @v tag Setting tag
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+ * @ret count Number of regions
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+ */
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+#define MEMMAP_COUNT( tag ) ( ( ( (tag) >> 24 ) & 0xff ) + 1 )
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+
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+/**
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+ * Extract starting region from setting tag
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+ *
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+ * @v tag Setting tag
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+ * @ret start Starting region
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+ */
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+#define MEMMAP_START( tag ) ( ( (tag) >> 16 ) & 0xff )
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+
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+/**
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+ * Extract ignore flag from setting tag
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+ *
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+ * @v tag Setting tag
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+ * @ret ignore Ignore non-existent regions
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+ */
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+#define MEMMAP_IGNORE_NONEXISTENT( tag ) ( (tag) & 0x00000400UL )
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+
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+/**
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+ * Extract length inclusion flag from setting tag
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+ *
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+ * @v tag Setting tag
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+ * @ret include_length Include length
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+ */
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+#define MEMMAP_INCLUDE_LENGTH( tag ) ( (tag) & 0x00000200UL )
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+
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+/**
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+ * Extract start address inclusion flag from setting tag
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+ *
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+ * @v tag Setting tag
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+ * @ret include_start Include start address
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+ */
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+#define MEMMAP_INCLUDE_START( tag ) ( (tag) & 0x00000100UL )
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+
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+/**
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+ * Extract scale factor from setting tag
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+ *
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+ * @v tag Setting tag
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+ * @v scale Scale factor
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+ */
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+#define MEMMAP_SCALE( tag ) ( (tag) & 0x3f )
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+
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+/** Memory map settings scope */
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+static struct settings_scope memmap_settings_scope;
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+
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+/**
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+ * Check applicability of memory map setting
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+ *
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+ * @v settings Settings block
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+ * @v setting Setting
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+ * @ret applies Setting applies within this settings block
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+ */
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+static int memmap_settings_applies ( struct settings *settings __unused,
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+ struct setting *setting ) {
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+
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+ return ( setting->scope == &memmap_settings_scope );
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+}
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+
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+/**
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+ * Fetch value of memory map setting
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+ *
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+ * @v settings Settings block
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+ * @v setting Setting to fetch
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+ * @v data Buffer to fill with setting data
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+ * @v len Length of buffer
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+ * @ret len Length of setting data, or negative error
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+ */
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+static int memmap_settings_fetch ( struct settings *settings,
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+ struct setting *setting,
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+ void *data, size_t len ) {
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+ struct memory_map memmap;
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+ struct memory_region *region;
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+ uint64_t result = 0;
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+ unsigned int i;
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+ unsigned int count;
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+
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+ DBGC ( settings, "MEMMAP start %d count %d %s%s%s%s scale %d\n",
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+ MEMMAP_START ( setting->tag ), MEMMAP_COUNT ( setting->tag ),
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+ ( MEMMAP_INCLUDE_START ( setting->tag ) ? "start" : "" ),
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+ ( ( MEMMAP_INCLUDE_START ( setting->tag ) &&
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+ MEMMAP_INCLUDE_LENGTH ( setting->tag ) ) ? "+" : "" ),
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+ ( MEMMAP_INCLUDE_LENGTH ( setting->tag ) ? "length" : "" ),
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+ ( MEMMAP_IGNORE_NONEXISTENT ( setting->tag ) ? " ignore" : "" ),
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+ MEMMAP_SCALE ( setting->tag ) );
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+
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+ /* Fetch memory map */
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+ get_memmap ( &memmap );
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+
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+ /* Extract results from memory map */
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+ count = MEMMAP_COUNT ( setting->tag );
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+ for ( i = MEMMAP_START ( setting->tag ) ; count-- ; i++ ) {
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+
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+ /* Check that region exists */
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+ if ( i >= memmap.count ) {
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+ if ( MEMMAP_IGNORE_NONEXISTENT ( setting->tag ) ) {
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+ continue;
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+ } else {
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+ DBGC ( settings, "MEMMAP region %d does not "
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+ "exist\n", i );
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+ return -ENOENT;
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+ }
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+ }
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+
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+ /* Extract results from this region */
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+ region = &memmap.regions[i];
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+ if ( MEMMAP_INCLUDE_START ( setting->tag ) ) {
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+ result += region->start;
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+ DBGC ( settings, "MEMMAP %d start %08llx\n",
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+ i, region->start );
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+ }
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+ if ( MEMMAP_INCLUDE_LENGTH ( setting->tag ) ) {
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+ result += ( region->end - region->start );
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+ DBGC ( settings, "MEMMAP %d length %08llx\n",
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+ i, ( region->end - region->start ) );
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+ }
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+ }
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+
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+ /* Scale result */
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+ result >>= MEMMAP_SCALE ( setting->tag );
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+
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+ /* Return result */
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+ result = cpu_to_be64 ( result );
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+ if ( len > sizeof ( result ) )
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+ len = sizeof ( result );
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+ memcpy ( data, &result, len );
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+
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+ /* Set type if not already specified */
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+ if ( ! setting->type )
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+ setting->type = &setting_type_hexraw;
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+
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+ return sizeof ( result );
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+}
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+
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+/** Memory map settings operations */
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+static struct settings_operations memmap_settings_operations = {
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+ .applies = memmap_settings_applies,
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+ .fetch = memmap_settings_fetch,
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+};
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+
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+/** Memory map settings */
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+static struct settings memmap_settings = {
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+ .refcnt = NULL,
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+ .siblings = LIST_HEAD_INIT ( memmap_settings.siblings ),
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+ .children = LIST_HEAD_INIT ( memmap_settings.children ),
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+ .op = &memmap_settings_operations,
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+ .default_scope = &memmap_settings_scope,
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+};
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+
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+/** Initialise memory map settings */
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+static void memmap_settings_init ( void ) {
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+ int rc;
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+
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+ if ( ( rc = register_settings ( &memmap_settings, NULL,
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+ "memmap" ) ) != 0 ) {
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+ DBG ( "MEMMAP could not register settings: %s\n",
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+ strerror ( rc ) );
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+ return;
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+ }
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+}
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+
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+/** Memory map settings initialiser */
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+struct init_fn memmap_settings_init_fn __init_fn ( INIT_NORMAL ) = {
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+ .initialise = memmap_settings_init,
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+};
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+
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+/** Memory map predefined settings */
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+struct setting memmap_predefined_settings[] __setting ( SETTING_MISC ) = {
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+ {
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+ .name = "memsize",
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+ .description = "Memory size (in MB)",
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+ .tag = MEMMAP_TAG ( 0, 0x100, 0, 1, 1, 20 ),
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+ .type = &setting_type_int32,
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+ .scope = &memmap_settings_scope,
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+ },
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+};
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