Add some SD file paging logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2932 42af7a65-404d-4744-a932-0658087f49c3

configs/README.txt

@@ -406,6 +406,20 @@ defconfig -- This is a configuration file similar to the Linux
 		  a binary image of the NuttX executable.  Pages will be filled by
 		  reading from offsets into this file that correspond to virtual
 		  fault addresses.
+		CONFIG_PAGING_MOUNTPT - If CONFIG_PAGING_BINPATH is defined, additional
+		  options may be provided to control the initialization of underlying
+		  devices. CONFIG_PAGING_MOUNTPT identifies the mountpoint to be used
+		  if a device is mounted.
+		CONFIG_PAGING_MINOR - Some mount operations require a "minor" number
+		  to identify the specific device instance. Default: 0
+		CONFIG_PAGING_SDSLOT - If CONFIG_PAGING_BINPATH is defined, additional
+		  options may be provided to control the initialization of underlying
+		  devices. CONFIG_PAGING_SDSLOT identifies the slot number of the SD
+		  device to initialize. This must be undefined if SD is not being used.
+		  This should be defined to be zero for the typical device that has
+		  only a single slot (See CONFIG_MMCSD_NSLOTS). If defined, 
+		  CONFIG_PAGING_SDSLOT will instruct certain board-specific logic to
+		  initialize the media in this SD slot.
 
 	The following can be used to disable categories of APIs supported
 	by the OS.  If the compiler supports weak functions, then it

configs/ea3131/README.txt

@@ -448,6 +448,10 @@ On-Demand Paging
   3. This means that all of the file system logic and FAT file
      system would have to reside in the locked text region.
 
+  And the show-stopper:
+
+  4. There is no MCI driver for the ea3131, yet!
+
 ARM/EA3131-specific Configuration Options
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

configs/ea3131/pgnsh/defconfig

@@ -405,6 +405,25 @@ CONFIG_SIG_SIGWORK=4
 #   page table entry to use for the vector mapping.
 # CONFIG_PAGING_VECL2VADDR - This is the virtual address of the L2
 #   page table entry to use for the vector mapping.
+# CONFIG_PAGING_BINPATH - If CONFIG_PAGING_BINPATH is defined, then it
+#   is the full path to a file on a mounted file system that contains
+#   a binary image of the NuttX executable.  Pages will be filled by
+#   reading from offsets into this file that correspond to virtual
+#   fault addresses.
+# CONFIG_PAGING_MOUNTPT - If CONFIG_PAGING_BINPATH is defined, additional
+#   options may be provided to control the initialization of underlying
+#   devices. CONFIG_PAGING_MOUNTPT identifies the mountpoint to be used
+#   if a device is mounted.
+# CONFIG_PAGING_MINOR - Some mount operations require a "minor" number
+#   to identify the specific device instance. Default: 0
+# CONFIG_PAGING_SDSLOT - If CONFIG_PAGING_BINPATH is defined, additional
+#   options may be provided to control the initialization of underlying
+#   devices. CONFIG_PAGING_SDSLOT identifies the slot number of the SD
+#   device to initialize. This must be undefined if SD is not being used.
+#   This should be defined to be zero for the typical device that has
+#   only a single slot (See CONFIG_MMCSD_NSLOTS). If defined, 
+#   CONFIG_PAGING_SDSLOT will instruct certain board-specific logic to
+#   initialize the media in this SD slot.
 #
 CONFIG_PAGING=y
 CONFIG_PAGING_PAGESIZE=1024
@@ -422,6 +441,10 @@ CONFIG_PAGING_BLOCKINGFILL=y
 #CONFIG_PAGING_VECPPAGE
 #CONFIG_PAGING_VECL2PADDR
 #CONFIG_PAGING_VECL2VADDR
+#CONFIG_PAGING_BINPATH="/mnt/pgsrc/nuttx.bin"
+CONFIG_PAGING_MOUNTPT="/mnt/pgsrc"
+CONFIG_PAGING_MINOR=0
+CONFIG_PAGING_SDSLOT=0
 
 #
 # The following can be used to disable categories of

configs/ea3131/src/up_fillpage.c

@@ -53,12 +53,75 @@
 #  include <stdbool.h>
 #  include <unistd.h>
 #  include <fcntl.h>
+#  ifdef CONFIG_PAGING_SDSLOT
+#    include <stdio.h>
+#    include <sys/mount.h>
+#    include <nuttx/sdio.h>
+#    include <nuttx/mmcsd.h>
+#    include "lpc313x_internal.h"
+#  endif
 #endif
 
 /****************************************************************************
  * Definitions
  ****************************************************************************/
 
+/* Configuration ************************************************************/
+
+/* SD SLOT number might depend on the board configuration */
+
+#ifdef CONFIG_ARCH_BOARD_EA3131
+#  define HAVE_SD  1
+#  if defined(CONFIG_PAGING_SDSLOT) && CONFIG_PAGING_SDSLOT != 0
+#    error "Only one SD slot"
+#    undef CONFIG_PAGING_SDSLOT
+#  endif
+#else
+   /* Add configuration for new LPC313X boards here */
+#  error "Unrecognized LPC313X board"
+#  undef CONFIG_PAGING_SDSLOT
+#  undef HAVE_SD
+#endif
+
+/* Are we accessing the page source data through a file path? */
+
+#ifdef CONFIG_PAGING_BINPATH
+
+   /* Can't support SD if the board does not support SD (duh) */
+
+#  if defined(CONFIG_PAGING_SDSLOT) && !defined(HAVE_SD)
+#    error "This board does not support SD"
+#    undef CONFIG_PAGING_SDSLOT
+#  endif
+
+   /* Can't support SD if mountpoints are disabled or if SDIO support
+    * is not enabled.
+    */
+
+#  if defined(CONFIG_DISABLE_MOUNTPOINT) || !defined(CONFIG_LPC313X_MCI)
+#    ifdef CONFIG_PAGING_SDSLOT
+#      error "Mountpoints and/or MCI disabled"
+#    endif
+#    undef CONFIG_PAGING_SDSLOT
+#    undef HAVE_SD
+#  endif
+
+   /* A mountpoint for the FAT file system must be provided */
+
+#  if !defined(CONFIG_PAGING_MOUNTPT) && defined(CONFIG_PAGING_SDSLOT)
+#    error "No CONFIG_PAGING_MOUNTPT provided"
+#    undef CONFIG_PAGING_SDSLOT
+#    undef HAVE_SD
+#  endif
+
+   /* If no minor number is provided, default to zero */
+
+#  ifndef CONFIG_PAGING_MINOR
+#    define CONFIG_PAGING_MINOR 0
+#  endif
+
+#endif /* CONFIG_PAGING_BINPATH */
+
 /****************************************************************************
  * Private Types
  ****************************************************************************/
@@ -83,6 +146,75 @@ static struct pg_source_s g_pgsrc;
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: lpc313x_initsrc()
+ *
+ * Description:
+ *  Initialize the source device that will support paging.
+ *  If BINPATH is defined, then it is the full path to a file on a mounted file
+ *  system.  In this case initialization will be deferred until the first
+ *  time that up_fillpage() is called.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PAGING_BINPATH
+static inline void lpc313x_initsrc(void)
+{
+#ifdef CONFIG_PAGING_SDSLOT
+  FAR struct sdio_dev_s *sdio;
+  int ret;
+#endif
+
+  /* Are we already initialized? */
+
+  if (!g_pgsrc.initialized)
+    {
+#ifdef CONFIG_PAGING_SDSLOT
+      char devname[16];
+#endif
+
+      pgvdbg("Initializing %s\n", CONFIG_PAGING_BINPATH);
+
+      /* No, do we need to mount an SD device? */
+
+#ifdef CONFIG_PAGING_SDSLOT
+
+      /* Yes.. First, get an instance of the SDIO interface */
+
+      sdio = sdio_initialize(CONFIG_PAGING_SDSLOT);
+      DEBUGASSERT(sdio != NULL);
+
+      /* Then bind the SDIO interface to the SD driver */
+
+      ret = mmcsd_slotinitialize(CONFIG_PAGING_MINOR, sdio);
+      DEBUGASSERT(ret == OK);
+  
+      /* Then let's guess and say that there is a card in the slot.
+       * (We are basically jodido anyway if there is no card in the slot).
+       */
+
+      sdio_mediachange(sdio, true);
+
+      /* Now mount the file system */
+
+      snprintf(devname, 16, "/dev/mmcsd%d", CONFIG_PAGING_MINOR);
+      ret = mount(devname, CONFIG_PAGING_MOUNTPT, "vfat", MS_RDONLY, NULL);
+      DEBUGASSERT(ret == OK);
+
+#endif /* CONFIG_PAGING_SDSLOT */
+
+      /* Open the selected path for read-only access */
+
+      g_pgsrc.fd = open(CONFIG_PAGING_BINPATH, O_RDONLY);
+      DEBUGASSERT(g_pgsrc.fd >= 0);
+      g_pgsrc.initialized = true;
+    }
+}
+
+#else /* CONFIG_PAGING_BINPATH */
+#  define lpc313x_initsrc()
+#endif /* CONFIG_PAGING_BINPATH */
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -151,7 +283,7 @@ int up_fillpage(FAR _TCB *tcb, FAR void *vpage)
   off_t   pos;
 #endif
 
-  pglldbg("TCB: %p vpage: %p far: %08x\n", tcb, vpage, tcb->xcp.far);
+  pgdbg("TCB: %p vpage: %p far: %08x\n", tcb, vpage, tcb->xcp.far);
   DEBUGASSERT(tcb->xcp.far >= PG_PAGED_VBASE && tcb->xcp.far < PG_PAGED_VEND);
 
   /* If BINPATH is defined, then it is the full path to a file on a mounted file
@@ -161,14 +293,11 @@ int up_fillpage(FAR _TCB *tcb, FAR void *vpage)
 
 #ifdef CONFIG_PAGING_BINPATH
 
-  if (!g_pgsrc.initialized)
+  /* Perform initialization of the paging source device (if necessary and
-    {
+   * appropriate)
-      /* Open the selected path for read-only access */
+   */
 
-      g_pgsrc.fd = open(CONFIG_PAGING_BINPATH, O_RDONLY);
+  lpc313x_initsrc();
-      DEBUGASSERT(g_pgsrc.fd >= 0);
-      g_pgsrc.initialized = true;
-    }
 
   /* Create an offset into the binary image that corresponds to the 
    * virtual address.   File offset 0 corresponds to PG_LOCKED_VBASE.
@@ -201,7 +330,7 @@ int up_fillpage(FAR _TCB *tcb, FAR void *vpage)
 
 int up_fillpage(FAR _TCB *tcb, FAR void *vpage, up_pgcallback_t pg_callback)
 {
-  pglldbg("TCB: %p vpage: %d far: %08x\n", tcb, vpage, tcb->xcp.far);
+  pgdbg("TCB: %p vpage: %d far: %08x\n", tcb, vpage, tcb->xcp.far);
   DEBUGASSERT(tcb->xcp.far >= PG_PAGED_VBASE && tcb->xcp.far < PG_PAGED_VEND);
 
 #ifdef CONFIG_PAGING_BINPATH