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/*

 * Copyright (c) 2005 Jakub Vana

 * Copyright (c) 2005 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.

 */

#if (defined(ia32) || defined(amd64) || defined(ia64) || defined(ia32xen))

#include <print.h>

#include <debug.h>

#include <test.h>

#include <atomic.h>

#include <proc/thread.h>

#include <arch.h>

#include <arch/arch.h>

#define THREADS     150

#define ATTEMPTS    100

#define E_10e8  271828182

#define PI_10e8 314159265

#ifdef KERN_ia32_ARCH_H_

static inline double sqrt(double x)

{

    double v;

    asm (

        "fsqrt\n"

        : "=t" (v)

        : "0" (x)

    );

    return v;

}

#endif

#ifdef KERN_amd64_ARCH_H_

static inline double sqrt(double x)

{

    double v;

    asm (

        "fsqrt\n"

        : "=t" (v)

        : "0" (x)

    );

    return v;

}

#endif

#ifdef KERN_ia64_ARCH_H_

#undef PI_10e8  

#define PI_10e8 3141592

static inline long double sqrt(long double a)

{  

    long double x = 1;

    long double lx = 0;

    if (a < 0.00000000000000001)

        return 0;

    while(x != lx) {

        lx = x;

        x = (x + (a / x)) / 2;

    }

    return x;

}

#endif

static atomic_t threads_ok;

static atomic_t threads_fault;

static waitq_t can_start;

static bool sh_quiet;

static void e(void *data)

{

    int i;

    double e, d, le, f;

    thread_detach(THREAD);

    waitq_sleep(&can_start);

    for (i = 0; i<ATTEMPTS; i++) {

        le = -1;

        e = 0;

        f = 1;

        for (d = 1; e != le; d *= f, f += 1) {

            le = e;

            e = e + 1 / d;

        }

        if ((int) (100000000 * e) != E_10e8) {

            if (!sh_quiet)

                printf("tid%d: e*10e8=%zd should be %zd\n", THREAD->tid, (unative_t) (100000000 * e), (unative_t) E_10e8);

            atomic_inc(&threads_fault);

            break;

        }

    }

    atomic_inc(&threads_ok);

}

static void pi(void *data)

{

    int i;

    double lpi, pi;

    double n, ab, ad;

    thread_detach(THREAD);

    waitq_sleep(&can_start);

    for (i = 0; i < ATTEMPTS; i++) {

        lpi = -1;

        pi = 0;

        for (n = 2, ab = sqrt(2); lpi != pi; n *= 2, ab = ad) {

            double sc, cd;

            sc = sqrt(1 - (ab * ab / 4));

            cd = 1 - sc;

            ad = sqrt(ab * ab / 4 + cd * cd);

            lpi = pi;

            pi = 2 * n * ad;

        }

#ifdef KERN_ia64_ARCH_H_

        if ((int) (1000000 * pi) != PI_10e8) {

            if (!sh_quiet)

                printf("tid%d: pi*10e8=%zd should be %zd\n", THREAD->tid, (unative_t) (1000000 * pi), (unative_t) (PI_10e8 / 100));

            atomic_inc(&threads_fault);

            break;

        }

#else

        if ((int) (100000000 * pi) != PI_10e8) {

            if (!sh_quiet)

                printf("tid%d: pi*10e8=%zd should be %zd\n", THREAD->tid, (unative_t) (100000000 * pi), (unative_t) PI_10e8);

            atomic_inc(&threads_fault);

            break;

        }

#endif

    }

    atomic_inc(&threads_ok);

}

char * test_fpu1(bool quiet)

{

    unsigned int i, total = 0;

    sh_quiet = quiet;

    waitq_initialize(&can_start);

    atomic_set(&threads_ok, 0);

    atomic_set(&threads_fault, 0);

    if (!quiet)

        printf("Creating %d threads... ", 2 * THREADS);

    for (i = 0; i < THREADS; i++) {  

        thread_t *t;

        if (!(t = thread_create(e, NULL, TASK, 0, "e", false))) {

            if (!quiet)

                printf("could not create thread %d\n", 2 * i);

            break;

        }

        thread_ready(t);

        total++;

        if (!(t = thread_create(pi, NULL, TASK, 0, "pi", false))) {

            if (!quiet)

                printf("could not create thread %d\n", 2 * i + 1);

            break;

        }

        thread_ready(t);

        total++;

    }

    if (!quiet)

        printf("ok\n");

    thread_sleep(1);

    waitq_wakeup(&can_start, WAKEUP_ALL);

    while (atomic_get(&threads_ok) != total) {

        if (!quiet)

            printf("Threads left: %d\n", total - atomic_get(&threads_ok));

        thread_sleep(1);

    }

    if (atomic_get(&threads_fault) == 0)

        return NULL;

    return "Test failed";

}

#endif