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bertos/io/kblock_ram.c

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ *
+ * \brief KBlock interface on RAM memory
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ *
+ * $WIZ$ module_name = "kfile_ram"
+ * $WIZ$ module_depends = "kblock"
+ */
+
+
+#include "kblock_ram.h"
+#include <string.h>
+
+
+static int kblockram_load(KBlock *b, block_idx_t index)
+{
+	KBlockRam *r = KBLOCKRAM_CAST(b);
+	memcpy(r->b.priv.buf, r->membuf + index * r->b.blk_size, r->b.blk_size);
+	return 0;
+}
+
+static int kblockram_store(struct KBlock *b, block_idx_t index)
+{
+	KBlockRam *r = KBLOCKRAM_CAST(b);
+	memcpy(r->membuf + index * r->b.blk_size, r->b.priv.buf, r->b.blk_size);
+	return 0;
+}
+
+static size_t kblockram_readBuf(struct KBlock *b, void *buf, size_t offset, size_t size)
+{
+	KBlockRam *r = KBLOCKRAM_CAST(b);
+	memcpy(buf, (uint8_t *)r->b.priv.buf + offset, size);
+	return size;
+}
+
+static size_t kblockram_readDirect(struct KBlock *b, block_idx_t index, void *buf, size_t offset, size_t size)
+{
+	KBlockRam *r = KBLOCKRAM_CAST(b);
+	memcpy(buf, r->membuf + index * r->b.blk_size + offset, size);
+	return size;
+}
+
+static size_t kblockram_writeBuf(struct KBlock *b, const void *buf, size_t offset, size_t size)
+{
+	KBlockRam *r = KBLOCKRAM_CAST(b);
+	memcpy((uint8_t *)r->b.priv.buf + offset, buf, size);
+	return size;
+}
+
+static size_t kblockram_writeDirect(struct KBlock *b, block_idx_t index, const void *buf, size_t offset, size_t size)
+{
+	KBlockRam *r = KBLOCKRAM_CAST(b);
+	ASSERT(buf);
+	ASSERT(index < b->blk_cnt);
+
+	memcpy(r->membuf + index * r->b.blk_size + offset, buf, size);
+	return size;
+}
+
+static int kblockram_dummy(UNUSED_ARG(struct KBlock *,b))
+{
+	return 0;
+}
+
+static const KBlockVTable kblockram_hwbuffered_vt =
+{
+	.readDirect = kblockram_readDirect,
+
+	.readBuf = kblockram_readBuf,
+	.writeBuf = kblockram_writeBuf,
+	.load = kblockram_load,
+	.store = kblockram_store,
+
+	.error = kblockram_dummy,
+	.clearerr = (kblock_clearerr_t)kblockram_dummy,
+	.close = kblockram_dummy,
+};
+
+
+static const KBlockVTable kblockram_swbuffered_vt =
+{
+	.readDirect = kblockram_readDirect,
+	.writeDirect = kblockram_writeDirect,
+
+	.readBuf = kblock_swReadBuf,
+	.writeBuf = kblock_swWriteBuf,
+	.load = kblock_swLoad,
+	.store = kblock_swStore,
+
+	.error = kblockram_dummy,
+	.clearerr = (kblock_clearerr_t)kblockram_dummy,
+	.close = kblockram_dummy,
+};
+
+static const KBlockVTable kblockram_unbuffered_vt =
+{
+	.readDirect = kblockram_readDirect,
+	.writeDirect = kblockram_writeDirect,
+
+	.error = kblockram_dummy,
+	.clearerr = (kblock_clearerr_t)kblockram_dummy,
+	.close = kblockram_dummy,
+};
+
+void kblockram_init(KBlockRam *ram, void *buf, size_t size, size_t block_size, bool buffered, bool hwbuffered)
+{
+	ASSERT(buf);
+	ASSERT(size);
+	ASSERT(block_size);
+
+	memset(ram, 0, sizeof(*ram));
+
+	DB(ram->b.priv.type = KBT_KBLOCKRAM);
+	ram->b.blk_size = block_size;
+	ram->b.priv.flags |= KB_PARTIAL_WRITE;
+
+	if (buffered)
+	{
+		ram->b.priv.flags |= KB_BUFFERED;
+		ram->b.blk_cnt = (size / block_size) - 1;
+		ram->b.priv.buf = buf;
+		// First page used as page buffer
+		ram->membuf = (uint8_t *)buf + block_size;
+
+		if (hwbuffered)
+			ram->b.priv.vt = &kblockram_hwbuffered_vt;
+		else
+			ram->b.priv.vt = &kblockram_swbuffered_vt;
+
+		kblockram_load(&ram->b, 0);
+	}
+	else
+	{
+		ram->b.blk_cnt = (size / block_size);
+		ram->membuf = (uint8_t *)buf;
+		ram->b.priv.vt = &kblockram_unbuffered_vt;
+	}
+}