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//==========================================================================

//

//      profile.c

//

//      Application profiling support

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 2002 Gary Thomas

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    Gary Thomas

// Contributors: 

// Date:         2002-11-14

// Purpose:      Application profiling support

// Description:  

//

//####DESCRIPTIONEND####

//

//===========================================================================

#include <pkgconf/profile_gprof.h>

#include <stdlib.h>

#include <cyg/infra/diag.h>

#include <network.h>

#include <tftp_support.h>

#include <cyg/profile/profile.h>

#include <cyg/profile/gmon_out.h>

static int num_buckets;

static unsigned short *profile;

static int bucket_size, bucket_shift;

static unsigned long start_addr, end_addr;

static int enabled;

static int tftp_server_id;

static int prof_rate;

static int profile_open(const char *, int);

static int profile_close(int);

static int profile_write(int, const void *, int);

static int profile_read(int, void *, int);

struct tftpd_fileops profile_fileops = {

    profile_open, profile_close, profile_write, profile_read

};

struct _file {

    unsigned char      *pos, *eof, *data;

    int                 flags;

    int                 mode;

};

#define FILE_OPEN 0x0001

#define NUM_FILES 1

static struct _file files[NUM_FILES];

static inline struct _file *

profile_fp(int fd)

{

    struct _file *fp;

    if ((fd < 0) || (fd >= NUM_FILES)) return (struct _file *)0;

    fp = &files[fd];

    if (!(fp->flags & FILE_OPEN)) return (struct _file *)0;

    return fp;

}

static int

profile_open(const char *fn, int flags)

{

    int fd = 0;

    struct _file *fp;

    int len = sizeof(struct gmon_hdr) + sizeof(struct gmon_hist_hdr) + (num_buckets*2) + 1;

    struct gmon_hdr _hdr;

    struct gmon_hist_hdr _hist_hdr;

    unsigned char *bp;

    int version = GMON_VERSION;

    int hist_size = num_buckets;

    int file_type = -1;

    fp = files;

    if (fp->flags & FILE_OPEN) {

        // File already open

        return -1;

    }

    if (!(flags & O_RDONLY)) {

        // Only read supported

        return -1;

    }

    if (strcmp(fn, "PROFILE.DAT") == 0) {

        file_type = 0;

    }

    if (file_type < 0) {

        // No supported file

        return -1;

    }

    // Set up file info

    enabled = 0;

    switch (file_type) { // In case another type ever supported

    case 0: // profile data

        fp->data = malloc(len);

        if (!fp->data) {

            diag_printf("Can't allocate buffer for profile data!\n");

            return -1;

        }

        fp->flags = FILE_OPEN;

        fp->mode = flags;

        fp->pos = fp->data;

        fp->eof = fp->pos + len;

        // Fill in profile data

        bp = fp->data;

        memset(&_hdr, 0, sizeof(_hdr));

        strcpy(_hdr.cookie, GMON_MAGIC);

        memcpy(_hdr.version, &version, sizeof(version));

        memcpy(bp, &_hdr, sizeof(_hdr));

        bp += sizeof(_hdr);

        memcpy(&_hist_hdr.low_pc, &start_addr, sizeof(start_addr));

        memcpy(&_hist_hdr.high_pc, &end_addr, sizeof(end_addr));

        memcpy(&_hist_hdr.hist_size, &hist_size, sizeof(hist_size));

        memcpy(&_hist_hdr.prof_rate, &prof_rate, sizeof(prof_rate));

        strcpy(_hist_hdr.dimen, "seconds");

        _hist_hdr.dimen_abbrev = 's';

        *bp++ = GMON_TAG_TIME_HIST;

        memcpy(bp, &_hist_hdr, sizeof(_hist_hdr));

        bp += sizeof(_hist_hdr);

        memcpy(bp, profile, (num_buckets*2));

        memset(profile, 0, (num_buckets*2));

        break;

    }

    return fd;

}

static int

profile_close(int fd)

{

    struct _file *fp = profile_fp(fd);

    if (!fp) return -1;

    if (fp->data) free(fp->data);

    fp->flags = 0;  // No longer open

    enabled = 1;

    return 0;

}

static int

profile_write(int fd, const void *buf, int len)

{

    return -1;

}

static int

profile_read(int fd, void *buf, int len)

{

    struct _file *fp = profile_fp(fd);

    int res;

    if (!fp) return -1;

    res = fp->eof - fp->pos;  // Number of bytes left in "file"

    if (res > len) res = len;

    if (res <= 0) return 0;  // End of file

    bcopy(fp->pos, buf, res);

    fp->pos += res;

    return res;

}

void

__profile_hit(unsigned long pc)

{

    int bucket;

    if (enabled) {

        if ((pc >= start_addr) && (pc <= end_addr)) {

            bucket = (pc - start_addr) >> bucket_shift;

            if (profile[bucket] < (unsigned short)0xFFFF) {

                profile[bucket]++;

            }

        }

    }

}

void

profile_on(void *_start, void *_end, int _bucket_size, int resolution)

{

    start_addr = (unsigned long)_start;

    end_addr = (unsigned long)_end;

    // Adjust bucket size to be a power of 2

    bucket_size = 1;

    bucket_shift = 0;

    while (bucket_size < _bucket_size) {

        bucket_size <<= 1;

        bucket_shift++;

    }

    if (bucket_size != _bucket_size) {

        bucket_size <<= 1;

        bucket_shift++;

    }

    // Calculate number of buckets

    num_buckets = ((end_addr - start_addr) + (bucket_size - 1)) / bucket_size;

    // Adjust end address so calculations come out

    end_addr = start_addr + (bucket_size * num_buckets);

    prof_rate = 1000000 / resolution;

    // Allocate buffer for profile data

    if (!(profile = malloc(num_buckets*2))) {

        diag_printf("Can't allocate profile buffer - ignored\n");

        return;

    }

    enabled = 1;

    diag_printf("Profile from %p..%p[%p], in %d buckets of size %d\n",

                start_addr, end_addr, _end, num_buckets, bucket_size);

    hal_enable_profile_timer(resolution);

    // Create a TFTP server to provide the data

    tftp_server_id = tftpd_start(CYGNUM_PROFILE_TFTP_PORT, &profile_fileops);

}