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/*

 * Ovlymgr.c -- Runtime Overlay Manager for the GDB testsuite.

 */

#include "ovlymgr.h"

/* Local functions and data: */

extern unsigned long _ovly_table[][4];

extern unsigned long _novlys __attribute__ ((section (".data")));

enum ovly_index { VMA, SIZE, LMA, MAPPED};

static void ovly_copy (unsigned long dst, unsigned long src, long size);

/* Flush the data and instruction caches at address START for SIZE bytes.

   Support for each new port must be added here.  */

/* FIXME: Might be better to have a standard libgloss function that

   ports provide that we can then use.  Use libgloss instead of newlib

   since libgloss is the one intended to handle low level system issues.

   I would suggest something like _flush_cache to avoid the user's namespace

   but not be completely obscure as other things may need this facility.  */

static void

FlushCache (void)

{

#ifdef __M32R__

  volatile char *mspr = (char *) 0xfffffff7;

  *mspr = 1;

#endif

}

/* OverlayLoad:

 * Copy the overlay into its runtime region,

 * and mark the overlay as "mapped".

 */

bool

OverlayLoad (unsigned long ovlyno)

{

  unsigned long i;

  if (ovlyno < 0 || ovlyno >= _novlys)

    exit (-1);  /* fail, bad ovly number */

  if (_ovly_table[ovlyno][MAPPED])

    return TRUE;        /* this overlay already mapped -- nothing to do! */

  for (i = 0; i < _novlys; i++)

    if (i == ovlyno)

      _ovly_table[i][MAPPED] = 1;       /* this one now mapped */

    else if (_ovly_table[i][VMA] == _ovly_table[ovlyno][VMA])

      _ovly_table[i][MAPPED] = 0;        /* this one now un-mapped */

  ovly_copy (_ovly_table[ovlyno][VMA],

             _ovly_table[ovlyno][LMA],

             _ovly_table[ovlyno][SIZE]);

  FlushCache ();

  return TRUE;

}

/* OverlayUnload:

 * Copy the overlay back into its "load" region.

 * Does NOT mark overlay as "unmapped", therefore may be called

 * more than once for the same mapped overlay.

 */

bool

OverlayUnload (unsigned long ovlyno)

{

  if (ovlyno < 0 || ovlyno >= _novlys)

    exit (-1);  /* fail, bad ovly number */

  if (!_ovly_table[ovlyno][MAPPED])

    exit (-1);  /* error, can't copy out a segment that's not "in" */

  ovly_copy (_ovly_table[ovlyno][LMA],

             _ovly_table[ovlyno][VMA],

             _ovly_table[ovlyno][SIZE]);

  return TRUE;

}

#ifdef __D10V__

#define IMAP0       (*(short *)(0xff00))

#define IMAP1       (*(short *)(0xff02))

#define DMAP        (*(short *)(0xff04))

static void

D10VTranslate (unsigned long logical,

               short *dmap,

               unsigned long **addr)

{

  unsigned long physical;

  unsigned long seg;

  unsigned long off;

  /* to access data, we use the following mapping

     0x00xxxxxx: Logical data address segment        (DMAP translated memory)

     0x01xxxxxx: Logical instruction address segment (IMAP translated memory)

     0x10xxxxxx: Physical data memory segment        (On-chip data memory)

     0x11xxxxxx: Physical instruction memory segment (On-chip insn memory)

     0x12xxxxxx: Phisical unified memory segment     (Unified memory)

     */

  /* Addresses must be correctly aligned */

  if (logical & (sizeof (**addr) - 1))

    exit (-1);

  /* If the address is in one of the two logical address spaces, it is

     first translated into a physical address */

  seg = (logical >> 24);

  off = (logical & 0xffffffL);

  switch (seg)

      {

      case 0x00: /* in logical data address segment */

        if (off <= 0x7fffL)

          physical = (0x10L << 24) + off;

        else

          /* Logical address out side of on-chip segment, not

             supported */

          exit (-1);

        break;

      case 0x01: /* in logical instruction address segment */

        {

          short map;

          if (off <= 0x1ffffL)

            map = IMAP0;

          else if (off <= 0x3ffffL)

            map = IMAP1;

          else

            /* Logical address outside of IMAP[01] segment, not

               supported */

            exit (-1);

          if (map & 0x1000L)

            {

            /* Instruction memory */

              physical = (0x11L << 24) | off;

            }

          else

            {

            /* Unified memory */

              physical = ((map & 0x7fL) << 17) + (off & 0x1ffffL);

              if (physical > 0xffffffL)

                /* Address outside of unified address segment */

                exit (-1);

              physical |= (0x12L << 24);

            }

          break;

        }

      case 0x10:

      case 0x11:

      case 0x12:

        physical = logical;

        break;

      default:

        exit (-1);      /* error */

      }

  seg = (physical >> 24);

  off = (physical & 0xffffffL);

  switch (seg)

    {

    case 0x10:  /* dst is a 15 bit offset into the on-chip memory */

      *dmap = 0;

      *addr = (long *) (0x0000 + ((short)off & 0x7fff));

      break;

    case 0x11:  /* dst is an 18-bit offset into the on-chip

                   instruction memory */

      *dmap = 0x1000L | ((off & 0x3ffffL) >> 14);

      *addr = (long *) (0x8000 + ((short)off & 0x3fff));

      break;

    case 0x12:  /* dst is a 24-bit offset into unified memory */

      *dmap = off >> 14;

      *addr = (long *) (0x8000 + ((short)off & 0x3fff));

      break;

    default:

      exit (-1);        /* error */

    }

}

#endif /* __D10V__ */

static void

ovly_copy (unsigned long dst, unsigned long src, long size)

{

#ifdef  __M32R__

  memcpy ((void *) dst, (void *) src, size);

  return;

#endif /* M32R */

#ifdef  __D10V__

  unsigned long *s, *d, tmp;

  short dmap_src, dmap_dst;

  short dmap_save;

  /* all section sizes should by multiples of 4 bytes */

  dmap_save = DMAP;

  D10VTranslate (src, &dmap_src, &s);

  D10VTranslate (dst, &dmap_dst, &d);

  while (size > 0)

    {

      /* NB: Transfer 4 byte (long) quantites, problems occure

         when only two bytes are transfered */

      DMAP = dmap_src;

      tmp = *s;

      DMAP = dmap_dst;

      *d = tmp;

      d++;

      s++;

      size -= sizeof (tmp);

      src += sizeof (tmp);

      dst += sizeof (tmp);

      if ((src & 0x3fff) == 0)

        D10VTranslate (src, &dmap_src, &s);

      if ((dst & 0x3fff) == 0)

        D10VTranslate (dst, &dmap_dst, &d);

    }

  DMAP = dmap_save;

#endif /* D10V */

}