X-Git-Url: https://yaffs.net/gitweb/?a=blobdiff_plain;f=direct%2Ftest-framework%2Fyaffs_ramdisk.c;fp=direct%2Ftest-framework%2Fyaffs_ramdisk.c;h=3d71e5170e0190aaf7e9c8c378bebe4623b67774;hb=c08faae4258b29a794ad55ca160c5a247145c838;hp=0000000000000000000000000000000000000000;hpb=87b33ecd1898c99b9aa2b0abcbb3e6002d6b3532;p=yaffs2.git

diff --git a/direct/test-framework/yaffs_ramdisk.c b/direct/test-framework/yaffs_ramdisk.c
new file mode 100644
index 0000000..3d71e51
--- /dev/null
+++ b/direct/test-framework/yaffs_ramdisk.c
@@ -0,0 +1,233 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * yaffs_ramdisk.c: yaffs ram disk component
+ * This provides a ram disk under yaffs.
+ * NB this is not intended for NAND emulation.
+ * Use this with dev->use_nand_ecc enabled, then ECC overheads are not required.
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_ramdisk.h"
+#include "yaffs_guts.h"
+#include "yaffs_packedtags1.h"
+
+
+
+#define SIZE_IN_MB 2
+
+#define BLOCK_SIZE (32 * 528)
+#define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
+
+
+
+
+
+typedef struct 
+{
+	u8 data[528]; // Data + spare
+} yramdisk_page;
+
+typedef struct
+{
+	yramdisk_page page[32]; // The pages in the block
+	
+} yramdisk_block;
+
+
+
+typedef struct
+{
+	yramdisk_block **block;
+	int nBlocks;
+} yramdisk_device;
+
+static yramdisk_device ramdisk;
+
+static int  CheckInit(struct yaffs_dev *dev)
+{
+	static int initialised = 0;
+	
+	int i;
+	int fail = 0;
+	//int nBlocks; 
+	int nAllocated = 0;
+	
+	if(initialised) 
+	{
+		return YAFFS_OK;
+	}
+
+	initialised = 1;
+	
+	
+	ramdisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
+	
+	ramdisk.block = malloc(sizeof(yramdisk_block *) * ramdisk.nBlocks);
+	
+	if(!ramdisk.block) return 0;
+	
+	for(i=0; i <ramdisk.nBlocks; i++)
+	{
+		ramdisk.block[i] = NULL;
+	}
+	
+	for(i=0; i <ramdisk.nBlocks && !fail; i++)
+	{
+		if((ramdisk.block[i] = malloc(sizeof(yramdisk_block))) == 0)
+		{
+			fail = 1;
+		}
+		else
+		{
+			yramdisk_erase(dev,i);
+			nAllocated++;
+		}
+	}
+	
+	if(fail)
+	{
+		for(i = 0; i < nAllocated; i++)
+		{
+			kfree(ramdisk.block[i]);
+		}
+		kfree(ramdisk.block);
+		
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Allocation failed, could only allocate %dMB of %dMB requested.\n",
+			nAllocated/64,ramdisk.nBlocks * 528);
+		return 0;
+	}
+	
+	
+	return 1;
+}
+
+int yramdisk_wr_chunk(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_ext_tags *tags)
+{
+	int blk;
+	int pg;
+	
+
+	CheckInit(dev);
+	
+	blk = nand_chunk/32;
+	pg = nand_chunk%32;
+	
+	
+	if(data)
+	{
+		memcpy(ramdisk.block[blk]->page[pg].data,data,512);
+	}
+	
+	
+	if(tags)
+	{
+		struct yaffs_packed_tags1 pt;
+		
+		yaffs_pack_tags1(&pt,tags);
+		memcpy(&ramdisk.block[blk]->page[pg].data[512],&pt,sizeof(pt));
+	}
+
+	return YAFFS_OK;	
+
+}
+
+
+int yramdisk_rd_chunk(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_ext_tags *tags)
+{
+	int blk;
+	int pg;
+
+	
+	CheckInit(dev);
+	
+	blk = nand_chunk/32;
+	pg = nand_chunk%32;
+	
+	
+	if(data)
+	{
+		memcpy(data,ramdisk.block[blk]->page[pg].data,512);
+	}
+	
+	
+	if(tags)
+	{
+		struct yaffs_packed_tags1 pt;
+		
+		memcpy(&pt,&ramdisk.block[blk]->page[pg].data[512],sizeof(pt));
+		yaffs_unpack_tags1(tags,&pt);
+		
+	}
+
+	return YAFFS_OK;
+}
+
+
+int yramdisk_check_chunk_erased(struct yaffs_dev *dev,int nand_chunk)
+{
+	int blk;
+	int pg;
+	int i;
+
+	
+	CheckInit(dev);
+	
+	blk = nand_chunk/32;
+	pg = nand_chunk%32;
+	
+	
+	for(i = 0; i < 528; i++)
+	{
+		if(ramdisk.block[blk]->page[pg].data[i] != 0xFF)
+		{
+			return YAFFS_FAIL;
+		}
+	}
+
+	return YAFFS_OK;
+
+}
+
+int yramdisk_erase(struct yaffs_dev *dev, int blockNumber)
+{
+	
+	CheckInit(dev);
+	
+	if(blockNumber < 0 || blockNumber >= ramdisk.nBlocks)
+	{
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Attempt to erase non-existant block %d\n",
+			blockNumber);
+		return YAFFS_FAIL;
+	}
+	else
+	{
+		memset(ramdisk.block[blockNumber],0xFF,sizeof(yramdisk_block));
+		return YAFFS_OK;
+	}
+	
+}
+
+int yramdisk_initialise(struct yaffs_dev *dev)
+{
+	//dev->use_nand_ecc = 1; // force on use_nand_ecc which gets faked. 
+						 // This saves us doing ECC checks.
+	
+	return YAFFS_OK;
+}
+