SAMA5: Add support for the FPU OS test

ChangeLog

@@ -5588,4 +5588,6 @@
 	  need to set a PHY configuration (2013-9-17).
 	* arch/arm/src/lpc17xx/lpc17_spi.c:  Remove undefined spi_select()
 	  prototype.  This was cause compile time warnings (2013-9-17).
+	* configs/sama5d3x-ek/src/sam_ostest.c:  Add OS test support for
+	  the FPU test (2013-9-18).
 

arch/arm/src/sama5/sam_emac.c

@@ -187,7 +187,14 @@
 
 #endif
 
-/* EMAC buffer sizes, number of buffers, and number of descriptors */
+/* EMAC buffer sizes, number of buffers, and number of descriptors.
+ *
+ * REVISIT: The CONFIG_NET_MULTIBUFFER might be useful.  It might be possible
+ * to use this option to send and receive messages directly into the DMA
+ * buffers, saving a copy.  There might be complications on the receiving
+ * side, however, where buffers may wrap and where the size of the received
+ * frame will typically be smaller than a full packet.
+ */
 
 #ifdef CONFIG_NET_MULTIBUFFER
 #  error CONFIG_NET_MULTIBUFFER must not be set

configs/sama5d3x-ek/README.txt

@@ -2056,11 +2056,7 @@ Configurations
         configuration to start the program in NOR FLASH (see just above).
         See "Creating and Using NORBOOT" above.
 
-      2013-7-31:  The OS test configuration is basically functional, but
-         takes a very long time in the round-robin scheduler test computing
-         prime numbers.  This test is supposed to be slow -- like several
-         seconds -- but not many minutes.  No idea why yet.  The best guess
-         would be an excessive number of context switches.
+      2013-7-31:  The OS test configuration is functional.
 
       2013-7-31:  Using delay loop calibration from the hello configuration.
         That configuration runs out of internal SRAM and, as a result, this

configs/sama5d3x-ek/ostest/defconfig

@@ -88,6 +88,7 @@ CONFIG_ARCH_CHIP_SAMA5=y
 # CONFIG_ARCH_CORTEXM3 is not set
 # CONFIG_ARCH_CORTEXM4 is not set
 CONFIG_ARCH_CORTEXA5=y
+# CONFIG_ARCH_CORTEXA8 is not set
 CONFIG_ARCH_FAMILY="armv7-a"
 CONFIG_ARCH_CHIP="sama5"
 CONFIG_ARCH_HAVE_FPU=y
@@ -148,7 +149,6 @@ CONFIG_SAMA5_USART1=y
 # CONFIG_SAMA5_UHPHS is not set
 # CONFIG_SAMA5_UDPHS is not set
 # CONFIG_SAMA5_GMAC is not set
-# CONFIG_SAMA5_EMAC is not set
 # CONFIG_SAMA5_LCDC is not set
 # CONFIG_SAMA5_ISI is not set
 # CONFIG_SAMA5_SSC0 is not set
@@ -163,6 +163,8 @@ CONFIG_SAMA5_USART1=y
 # CONFIG_SAMA5_FUSE is not set
 # CONFIG_SAMA5_MPDDRC is not set
 # CONFIG_SAMA5_PIO_IRQ is not set
+CONFIG_SAMA5_HAVE_GMAC=y
+# CONFIG_SAMA5_HAVE_EMAC is not set
 
 #
 # External Memory Configuration

configs/sama5d3x-ek/src/Makefile

@@ -110,6 +110,10 @@ ifeq ($(CONFIG_USBMSC),y)
 CSRCS += sam_usbmsc.c
 endif
 
+ifeq ($(CONFIG_ARCH_FPU),y)
+CSRCS += sam_ostest.c
+endif
+
 ifeq ($(CONFIG_ARCH_LEDS),y)
 CSRCS += sam_autoleds.c
 else

configs/sama5d3x-ek/src/sam_ostest.c

@@ -0,0 +1,113 @@
+/************************************************************************************
+ * configs/sama5d3x-ek/src/sam_ostest.c
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <debug.h>
+
+#include <arch/irq.h>
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+#include "sama5d3x-ek.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration ********************************************************************/
+
+#undef HAVE_FPU
+#if defined(CONFIG_ARCH_FPU) && !defined(CONFIG_EXAMPLES_OSTEST_FPUTESTDISABLE) && \
+    defined(CONFIG_EXAMPLES_OSTEST_FPUSIZE) && defined(CONFIG_SCHED_WAITPID) && \
+    !defined(CONFIG_DISABLE_SIGNALS)
+#    define HAVE_FPU 1
+#endif
+
+#ifdef HAVE_FPU
+
+#if CONFIG_EXAMPLES_OSTEST_FPUSIZE != (4*FPU_CONTEXT_REGS)
+#  error "CONFIG_EXAMPLES_OSTEST_FPUSIZE has the wrong size"
+#endif
+
+/************************************************************************************
+ * Private Data
+ ************************************************************************************/
+
+static uint32_t g_saveregs[XCPTCONTEXT_REGS];
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+/* Given an array of size CONFIG_EXAMPLES_OSTEST_FPUSIZE, this function will return
+ * the current FPU registers.
+ */
+
+void arch_getfpu(FAR uint32_t *fpusave)
+{
+  irqstate_t flags;
+
+  /* Take a snapshot of the thread context right now */
+
+  flags = irqsave();
+  up_saveusercontext(g_saveregs);
+
+  /* Return only the floating register values */
+
+  memcpy(fpusave, &g_saveregs[REG_S0], (4*FPU_CONTEXT_REGS));
+  irqrestore(flags);
+}
+
+/* Given two arrays of size CONFIG_EXAMPLES_OSTEST_FPUSIZE this function
+ * will compare them and return true if they are identical.
+ */
+
+bool arch_cmpfpu(FAR const uint32_t *fpusave1, FAR const uint32_t *fpusave2)
+{
+  return memcmp(fpusave1, fpusave2, (4*FPU_CONTEXT_REGS)) == 0;
+}
+
+#endif /* HAVE_FPU */