/*****************************************************************************************
 Copyright (c) 2002 The UbixOS Project
 All rights reserved.

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 permitted provided that the following conditions are met:

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 contributors may be used to endorse or promote products derived from this software
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 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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 $Id: getfreepage.c 54 2016-01-11 01:29:55Z reddawg $

 *****************************************************************************************/

#include <vmm/vmm.h>
#include <lib/kprintf.h>
#include <ubixos/kpanic.h>
#include <ubixos/spinlock.h>
#include <ubixos/sched.h>

/* MrOlsen (2016-01-15) TEMP: Put These somewhere else */
typedef __uint32_t      __vm_size_t;
typedef __vm_size_t     vm_size_t;
#define        EINVAL          22              /* Invalid argument */
#define MAP_ALIGNED(n)   ((n) << MAP_ALIGNMENT_SHIFT)
#define MAP_ALIGNMENT_SHIFT     24
#define MAP_ALIGNMENT_MASK      MAP_ALIGNED(0xff)
#define MAP_ALIGNED_SUPER       MAP_ALIGNED(1) /* align on a superpage */
#define        NBBY    8               /* number of bits in a byte */


/* PROTs */
#define PROT_NONE       0x00    /* no permissions */
#define PROT_READ       0x01    /* pages can be read */
#define PROT_WRITE      0x02    /* pages can be written */
#define PROT_EXEC       0x04    /* pages can be executed */

/* FLAGs */

/*
 * Do I Need These?
 */
#define MAP_SHARED      0x0001          /* share changes */
#define MAP_PRIVATE     0x0002          /* changes are private */
#define MAP_FIXED       0x0010 /* map addr must be exactly as requested */
#define MAP_RENAME       0x0020 /* Sun: rename private pages to file */
#define MAP_NORESERVE    0x0040 /* Sun: don't reserve needed swap area */
#define MAP_RESERVED0080 0x0080 /* previously misimplemented MAP_INHERIT */
#define MAP_RESERVED0100 0x0100 /* previously unimplemented MAP_NOEXTEND */
#define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
#define MAP_STACK        0x0400 /* region grows down, like a stack */
#define MAP_NOSYNC       0x0800 /* page to but do not sync underlying file */

/*
 * Mapping type
 */
#define MAP_FILE         0x0000 /* map from file (default) */
#define MAP_ANON         0x1000 /* allocated from memory, swap space */

int freebsd6_mmap( struct thread *td, struct freebsd6_mmap_args *uap ) {
  vm_size_t size, pageoff;
  off_t pos;
  int align, flags, error;
  vm_offset_t addr;

  int i;

  error = 0;

  size = uap->len;
  flags = uap->flags;
  pos = uap->pos;

  kprintf( "uap->flags: [0x%X]\n", uap->flags );
  kprintf( "uap->addr:  [0x%X]\n", uap->addr );
  kprintf( "uap->len:   [0x%X]\n", uap->len );
  kprintf( "uap->prot:  [0x%X]\n", uap->prot );
  kprintf( "uap->fd:    [%i]\n", uap->fd );
  kprintf( "uap->pad:   [0x%X]\n", uap->pad );
  kprintf( "uap->pos:   [0x%X]\n", uap->pos );

  if ( (uap->flags & MAP_ANON) != 0 )
    pos = 0;

  /*
   * Align the file position to a page boundary,
   * and save its page offset component.
   */

  pageoff = (pos & PAGE_MASK);
  pos -= pageoff;

  /* Adjust size for rounding (on both ends). */
  size += pageoff;
  size = (vm_size_t) round_page( size );

  /* Ensure alignment is at least a page and fits in a pointer. */
  align = flags & MAP_ALIGNMENT_MASK;
  if ( align != 0 && align != MAP_ALIGNED_SUPER && (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY || align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT) )
    return (EINVAL);

  if ( flags & MAP_FIXED ) {
    kprintf( "FIXED NOT SUPPORTED YET" );
    return (EINVAL);
  }
  else {
    /* At Some Point I Need To  Proc Lock Incase It's Threaded */
/* MrOlsen (2016-01-15) Temporary comment out
    if ( addr == 0 || (addr >= round_page( (vm_offset_t) vms->vm_taddr ) && addr < round_page( (vm_offset_t) vms->vm_daddr + lim_max( td->td_proc, RLIMIT_DATA ) )) )
      addr = round_page( (vm_offset_t) vms->vm_daddr + lim_max( td->td_proc, RLIMIT_DATA ) );
*/
  }

  if ( flags & MAP_ANON ) {
    /*
     * Mapping blank space is trivial.
     */

    /*
     handle = NULL;
     handle_type = OBJT_DEFAULT;
     maxprot = VM_PROT_ALL;
     cap_maxprot = VM_PROT_ALL;
     */
    for ( i = addr; i < (addr + size); i += 0x1000 ) {
      if ( vmm_remapPage( vmmFindFreePage( _current->id ), i, PAGE_DEFAULT ) == 0x0 )
        K_PANIC( "remap Failed" );
    }
    kprintf( "td->vm_dsize should be adjust but isn't" );
  }
  else {
    /* Mapping File */
    kprintf( "File Mapping Not Supported Yet" );
    return (EINVAL);
  }

  return (0x0);
}

/***
 END
 ***/