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-rw-r--r--apps/examples/ostest/fpu.c344
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diff --git a/apps/examples/ostest/fpu.c b/apps/examples/ostest/fpu.c
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-/***********************************************************************
- * apps/examples/ostest/fpu.c
- *
- * Copyright (C) 2012 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 <sys/wait.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <sched.h>
-
-#include "ostest.h"
-
-/***********************************************************************
- * Pre-processor definitions
- ***********************************************************************/
-/* Configuration *******************************************************/
-
-#undef HAVE_FPU
-#ifdef CONFIG_ARCH_FPU
-# if defined(CONFIG_EXAMPLES_OSTEST_FPUSIZE) && defined(CONFIG_SCHED_WAITPID) && !defined(CONFIG_DISABLE_SIGNALS)
-# define HAVE_FPU 1
-# else
-# ifndef CONFIG_EXAMPLES_OSTEST_FPUSIZE
-# warning "FPU test not built; CONFIG_EXAMPLES_OSTEST_FPUSIZE not defined"
-# endif
-# ifndef CONFIG_SCHED_WAITPID
-# warning "FPU test not built; CONFIG_SCHED_WAITPID not defined"
-# endif
-# ifdef CONFIG_DISABLE_SIGNALS
-# warning "FPU test not built; CONFIG_DISABLE_SIGNALS defined"
-# endif
-# endif
-#endif
-
-#ifdef HAVE_FPU
-
-#ifndef CONFIG_EXAMPLES_OSTEST_FPULOOPS
-# define CONFIG_EXAMPLES_OSTEST_FPULOOPS 16
-#endif
-
-#ifndef CONFIG_EXAMPLES_OSTEST_FPUMSDELAY
-# define CONFIG_EXAMPLES_OSTEST_FPUMSDELAY 750
-#endif
-
-#ifndef CONFIG_EXAMPLES_OSTEST_FPUPRIORITY
-# define CONFIG_EXAMPLES_OSTEST_FPUPRIORITY SCHED_PRIORITY_DEFAULT
-#endif
-
-#ifndef CONFIG_EXAMPLES_OSTEST_FPUSTACKSIZE
-# define CONFIG_EXAMPLES_OSTEST_FPUSTACKSIZE 2048
-#endif
-
-/* Other defintions ****************************************************/
-/* We'll keep all data using 32-bit values only to force 32-bit alignment.
- * This logic has no real notion of the underlying representation.
- */
-
-#define FPU_WORDSIZE ((CONFIG_EXAMPLES_OSTEST_FPUSIZE+3)>>2)
-#define FPU_NTHREADS 2
-
-#ifndef NULL
-# define NULL (void*)0
-#endif
-
-/***********************************************************************
- * External Dependencies
- ***********************************************************************/
-/* This test is very dependent on support provided by the chip/board-
- * layer logic. In particular, it expects the following functions
- * to be provided:
- */
-
-/* Given an array of size CONFIG_EXAMPLES_OSTEST_FPUSIZE, this function
- * will return the current FPU registers.
- */
-
-extern void arch_getfpu(FAR uint32_t *fpusave);
-
-/* Given two arrays of size CONFIG_EXAMPLES_OSTEST_FPUSIZE this
- * function will compare them and return true if they are identical.
- */
-
-extern bool arch_cmpfpu(FAR const uint32_t *fpusave1,
- FAR const uint32_t *fpusave2);
-
-/***********************************************************************
- * Private Types
- ***********************************************************************/
-
-struct fpu_threaddata_s
-{
- uint32_t save1[FPU_WORDSIZE];
- uint32_t save2[FPU_WORDSIZE];
-
- /* These are just dummy values to force the compiler to do the
- * requested floating point computations without the nonsense
- * computations being optimized away.
- */
-
- volatile float sp1;
- volatile float sp2;
- volatile float sp3;
- volatile float sp4;
-
- volatile float dp1;
- volatile float dp2;
- volatile float dp3;
- volatile float dp4;
-};
-
-/***********************************************************************
- * Private Data
- ***********************************************************************/
-
-static uint8_t g_fpuno;
-/* static */ struct fpu_threaddata_s g_fputhread[FPU_NTHREADS];
-
-/***********************************************************************
- * Private Functions
- ***********************************************************************/
-
-static void fpu_dump(FAR uint32_t *buffer, FAR const char *msg)
-{
- int i, j, k;
-
- printf("%s (%p):\n", msg, buffer);
- for (i = 0; i < FPU_WORDSIZE; i += 8)
- {
- printf(" %04x: ", i);
- for (j = 0; j < 8; j++)
- {
- k = i + j;
-
- if (k < FPU_WORDSIZE)
- {
- printf("%08x ", buffer[k]);
- }
- else
- {
- printf("\n");
- break;
- }
- }
- printf("\n");
- }
-}
-
-static int fpu_task(int argc, char *argv[])
-{
- FAR struct fpu_threaddata_s *fpu;
- register float sp1;
- register float sp2;
- register float sp3;
- register float sp4;
- register double dp1;
- register double dp2;
- register double dp3;
- register double dp4;
-
- int id;
- int i;
-
- /* Which are we? */
-
- sched_lock();
- fpu = &g_fputhread[g_fpuno];
- id = (int)(++g_fpuno);
- sched_unlock();
-
- /* Seed the flowing point values */
-
- sp1 = (float)id;
- dp1 = (double)id;
-
- for (i = 0; i < CONFIG_EXAMPLES_OSTEST_FPULOOPS; i++)
- {
- printf("FPU#%d: pass %d\n", id, i+1);
- fflush(stdout);
-
- /* Set the FPU register save arrays to a known-but-illogical values so
- * that we can verify that reading of the registers actually occurs.
- */
-
- memset(fpu->save1, 0xff, FPU_WORDSIZE * sizeof(uint32_t));
- memset(fpu->save2, 0xff, FPU_WORDSIZE * sizeof(uint32_t));
-
- /* Prevent context switches while we set up some stuff */
-
- sched_lock();
-
- /* Do some trivial floating point operations that should cause some
- * changes to floating point registers. First, some single preceision
- * nonsense.
- */
-
- sp4 = (float)3.14159 * sp1; /* Multiple by Pi */
- sp3 = sp4 + (float)1.61803; /* Add the golden ratio */
- sp2 = sp3 / (float)2.71828; /* Divide by Euler's constant */
- sp1 = sp2 + (float)1.0; /* Plus one */
-
- fpu->sp1 = sp1; /* Make the compiler believe that somebody cares about the result */
- fpu->sp2 = sp2;
- fpu->sp3 = sp3;
- fpu->sp4 = sp4;
-
- /* Again using double precision */
-
- dp4 = (double)3.14159 * dp1; /* Multiple by Pi */
- dp3 = dp4 + (double)1.61803; /* Add the golden ratio */
- dp2 = dp3 / (double)2.71828; /* Divide by Euler's constant */
- dp1 = dp2 + (double)1.0; /* Plus one */
-
- fpu->dp1 = dp1; /* Make the compiler believe that somebody cares about the result */
- fpu->dp2 = dp2;
- fpu->dp3 = dp3;
- fpu->dp4 = dp4;
-
- /* Sample the floating point registers */
-
- arch_getfpu(fpu->save1);
-
- /* Re-read and verify the FPU registers consistently without corruption */
-
- arch_getfpu(fpu->save2);
- if (!arch_cmpfpu(fpu->save1, fpu->save2))
- {
- printf("ERROR FPU#%d: save1 and save2 do not match\n", id);
- fpu_dump(fpu->save1, "Values after math operations (save1)");
- fpu_dump(fpu->save2, "Values after verify re-read (save2)");
- return EXIT_FAILURE;
- }
-
- /* Now unlock and sleep for a while -- this should result in some context switches */
-
- sched_unlock();
- usleep(CONFIG_EXAMPLES_OSTEST_FPUMSDELAY * 1000);
-
- /* Several context switches should have occurred. Now verify that the floating
- * point registers are still correctly set.
- */
-
- arch_getfpu(fpu->save2);
- if (!arch_cmpfpu(fpu->save1, fpu->save2))
- {
- printf("ERROR FPU#%d: save1 and save2 do not match\n", id);
- fpu_dump(fpu->save1, "Values before waiting (save1)");
- fpu_dump(fpu->save2, "Values after waiting (save2)");
- return EXIT_FAILURE;
- }
- }
-
- printf("FPU#%d: Succeeded\n", id);
- fflush(stdout);
- return EXIT_SUCCESS;
-}
-#endif /* HAVE_FPU */
-
-/***********************************************************************
- * Private Functions
- ***********************************************************************/
-
-void fpu_test(void)
-{
-#ifdef HAVE_FPU
- pid_t task1;
- pid_t task2;
- int statloc;
-
- /* Start two two tasks */
-
- g_fpuno = 0;
- printf("Starting task FPU#1\n");
- task1 = TASK_CREATE("FPU#1", CONFIG_EXAMPLES_OSTEST_FPUPRIORITY, CONFIG_EXAMPLES_OSTEST_FPUSTACKSIZE, fpu_task, NULL);
- if (task1 < 0)
- {
- printf("fpu_test: ERROR Failed to start task FPU#1\n");
- }
- else
- {
- printf("fpu_test: Started task FPU#1 at PID=%d\n", task1);
- }
- fflush(stdout);
- usleep(250);
-
- printf("Starting task FPU#2\n");
- task2 = TASK_CREATE("FPU#2", CONFIG_EXAMPLES_OSTEST_FPUPRIORITY, CONFIG_EXAMPLES_OSTEST_FPUSTACKSIZE, fpu_task, NULL);
- if (task2 < 0)
- {
- printf("fpu_test: ERROR Failed to start task FPU#1\n");
- }
- else
- {
- printf("fpu_test: Started task FPU#2 at PID=%d\n", task2);
- }
-
- /* Wait for each task to complete */
-
- fflush(stdout);
- (void)waitpid(task1, &statloc, 0);
- (void)waitpid(task2, &statloc, 0);
-
-#else
- printf("fpu_test: ERROR: The FPU test is not properly configured\n");
-#endif
- printf("fpu_test: Returning\n");
-}
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