Add simulated block device

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@208 42af7a65-404d-4744-a932-0658087f49c3

arch/sim/src/Makefile

@@ -45,7 +45,7 @@ CSRCS		= up_initialize.c up_idle.c up_interruptcontext.c \
 		  up_releasestack.c  up_unblocktask.c up_blocktask.c \
 		  up_releasepending.c up_reprioritizertr.c \
 		  up_exit.c up_schedulesigaction.c up_allocateheap.c \
-		  up_devconsole.c
+		  up_devconsole.c up_blockdevice.c
 COBJS		= $(CSRCS:.c=$(OBJEXT))
 
 SRCS		= $(ASRCS) $(CSRCS)

arch/sim/src/up_blockdevice.c

+/****************************************************************************
+ * up_blockdevice.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include <nuttx/fs.h>
+#include <errno.h>
+
+#include "up_internal.h"
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+#define NSECTORS    128
+#define SECTOR_SIZE 512
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int     up_open(FAR struct file *filp);
+static int     up_close(FAR struct file *filp);
+static ssize_t up_read(FAR struct file *filp, char *buffer,
+                       size_t start_sector, size_t nsectors);
+static ssize_t up_write(FAR struct file *filp, const char *buffer,
+                        size_t start_sector, size_t nsectors);
+static size_t  up_geometry(FAR struct file *filp, struct geometry *geometry);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct block_operations g_bops =
+{
+  .open     = up_open,
+  .close    = up_close,
+  .read     = up_read,
+  .write    = up_write,
+  .geometry = up_geometry,
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_open
+ *
+ * Description: Open the block device
+ *
+ ****************************************************************************/
+
+static int up_open(FAR struct file *filp)
+{
+  filp->f_priv = (void*)malloc(NSECTORS*SECTOR_SIZE);
+  return 0;
+}
+
+/****************************************************************************
+ * Name: up_close
+ *
+ * Description: close the block device
+ *
+ ****************************************************************************/
+
+static int up_close(FAR struct file *filp)
+{
+  if (filp->f_priv)
+    {
+        free(filp->f_priv);
+        filp->f_priv = NULL;
+    }
+  return 0;
+}
+
+/****************************************************************************
+ * Name: up_read
+ *
+ * Description:  Read the specified numer of sectors
+ *
+ ****************************************************************************/
+
+static ssize_t up_read(FAR struct file *filp, char *buffer,
+                       size_t start_sector, size_t nsectors)
+{
+  char *src = filp->f_priv;
+  if (src &&
+      start_sector < NSECTORS &&
+      start_sector + nsectors < NSECTORS)
+    {
+      memcpy(buffer, &src[start_sector*SECTOR_SIZE], nsectors*SECTOR_SIZE);
+      return OK;
+    }
+  else
+    {
+      return -EINVAL;
+    }
+}
+
+/****************************************************************************
+ * Name: up_write
+ *
+ * Description: Write the specified number of sectors
+ *
+ ****************************************************************************/
+
+static ssize_t up_write(FAR struct file *filp, const char *buffer,
+                        size_t start_sector, size_t nsectors)
+{
+  char *dest = filp->f_priv;
+  if (dest &&
+      start_sector < NSECTORS &&
+      start_sector + nsectors < NSECTORS)
+    {
+      memcpy(&dest[start_sector*SECTOR_SIZE], buffer, nsectors*SECTOR_SIZE);
+      return OK;
+    }
+  else
+    {
+      return -EINVAL;
+    }
+}
+
+/****************************************************************************
+ * Name: up_geometry
+ *
+ * Description: Return device geometry
+ *
+ ****************************************************************************/
+
+static size_t up_geometry(FAR struct file *filp, struct geometry *geometry)
+ {
+   if (geometry)
+     {
+       geometry->geo_available  = (filp->f_priv != NULL);
+       geometry->geo_nsectors   = NSECTORS;
+       geometry->geo_sectorsize = SECTOR_SIZE;
+       return OK;
+     }
+   return -EINVAL;
+ }
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_registerblockdevice
+ *
+ * Description: Register the simulated block device
+
+ ****************************************************************************/
+
+void up_registerblockdevice(void)
+{
+   (void)register_blockdriver("/dev/blkdev", &g_bops, 0, NULL);
+}
+
+

arch/sim/src/up_devconsole.c

@@ -125,7 +125,7 @@ static ssize_t devconsole_write(struct file *filp, const char *buffer, size_t le
 
 void up_devconsole(void)
 {
-  (void)register_inode("/dev/console", &devconsole_fops, 0666, NULL);
+  (void)register_driver("/dev/console", &devconsole_fops, 0666, NULL);
 }
 
 int up_putc(int ch)

arch/sim/src/up_initialize.c

@@ -83,6 +83,7 @@ void up_initialize(void)
 {
   /* Register devices */
 
-  devnull_register();   /* Standard /dev/null */
-  up_devconsole();      /* Our private /dev/console */
+  devnull_register();       /* Standard /dev/null */
+  up_devconsole();          /* Our private /dev/console */
+  up_registerblockdevice(); /* Our simulated block device /dev/blkdev */
 }

arch/sim/src/up_internal.h

@@ -86,6 +86,7 @@ extern void up_longjmp(int *jb, int val) __attribute__ ((noreturn));
 /* up_devconsole **********************************************************/
 
 extern void up_devconsole(void);
+extern void up_registerblockdevice(void);
 
 #endif /* __ASSEMBLY__ */
 #endif /* __ARCH_UP_INTERNAL_H */