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/* vga.c -- Definition of types and structures for VGA/LCD

   Copyright (C) 2001 Marko Mlinar, markom@opencores.org

   Copyright (C) 2008 Embecosm Limited

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.

   This program 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 3 of the License, or (at your option)

   any later version.

   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

/* Autoconf and/or portability configuration */

#include "config.h"

#include "port.h"

/* System includes */

#include <stdlib.h>

#include <stdio.h>

/* Package includes */

#include "arch.h"

#include "sim-config.h"

#include "abstract.h"

#include "sched.h"

#include "toplevel-support.h"

#define VGA_CTRL        0x00    /* Control Register */

#define VGA_STAT        0x04    /* Status Register */

#define VGA_HTIM        0x08    /* Horizontal Timing Register */

#define VGA_VTIM        0x0c    /* Vertical Timing Register */

#define VGA_HVLEN       0x10    /* Horizontal and Vertical Length Register */

#define VGA_VBARA       0x14    /* Video Memory Base Address Register A */

#define VGA_VBARB       0x18    /* Video Memory Base Address Register B */

#define VGA_CLUTA       0x800

#define VGA_CLUTB       0xc00

#define VGA_MASK        0xfff

#define VGA_ADDR_SPACE  1024

/* List of implemented registers; all other are ignored.  */

/* Control Register */

#define VGA_CTRL_VEN    0x00000001      /* Video Enable */

#define VGA_CTRL_CD     0x00000300      /* Color Depth */

#define VGA_CTRL_PC     0x00000400      /* Pseudo Color */

/* Status Register */

/* Horiz. Timing Register */

/* Vert. Timing Register */

/* Horiz. and Vert. Length Register */

/* When this counter reaches config.vgas[].refresh_rate, a screenshot is taken and outputted */

struct vga_state

{

  int enabled;

  int pics;

  unsigned long ctrl, stat, htim, vtim;

  int vbindex;

  unsigned long vbar[2];

  unsigned hlen, vlen;

  int pindex;

  unsigned long palette[2][256];

  oraddr_t baseaddr;

  int refresh_rate;

  int irq;

  char *filename;

};

/* Write a register */

void

vga_write32 (oraddr_t addr, uint32_t value, void *dat)

{

  struct vga_state *vga = dat;

  switch (addr)

    {

    case VGA_CTRL:

      vga->ctrl = value;

      break;

    case VGA_STAT:

      vga->stat = value;

      break;

    case VGA_HTIM:

      vga->htim = value;

      break;

    case VGA_VTIM:

      vga->vtim = value;

      break;

    case VGA_HVLEN:

      vga->hlen = (value >> 16) + 2;

      vga->hlen = (value & 0xffff) + 2;

      break;

    case VGA_VBARA:

      vga->vbar[0] = value;

      break;

    case VGA_VBARB:

      vga->vbar[1] = value;

      break;

    default:

      if (addr >= VGA_CLUTA && addr < VGA_CLUTB)

        {

          vga->palette[0][addr - VGA_CLUTA] = value & 0x00ffffff;

        }

      else if (addr >= VGA_CLUTB)

        {

          vga->palette[1][addr - VGA_CLUTB] = value & 0x00ffffff;

        }

      else

        {

          fprintf (stderr,

                   "vga_write32( 0x%" PRIxADDR ", 0x%08" PRIx32

                   " ): Out of range\n", addr + vga->baseaddr, value);

          return;

        }

      break;

    }

}

/* Read a register */

uint32_t

vga_read32 (oraddr_t addr, void *dat)

{

  struct vga_state *vga = dat;

  switch (addr)

    {

    case VGA_CTRL:

      return vga->ctrl;

    case VGA_STAT:

      return vga->stat;

    case VGA_HTIM:

      return vga->htim;

    case VGA_VTIM:

      return vga->vtim;

    case VGA_HVLEN:

      return ((vga->hlen - 2) << 16) | (vga->vlen - 2);

    case VGA_VBARA:

      return vga->vbar[0];

    case VGA_VBARB:

      return vga->vbar[1];

    default:

      if (addr >= VGA_CLUTA && addr < VGA_CLUTB)

        {

          return vga->palette[0][addr - VGA_CLUTA];

        }

      else if (addr >= VGA_CLUTB)

        {

          return vga->palette[1][addr - VGA_CLUTB];

        }

      else

        {

          fprintf (stderr, "vga_read32( 0x%" PRIxADDR " ): Out of range\n",

                   addr);

          return 0;

        }

      break;

    }

  return 0;

}

/* This code will only work on little endian machines */

#ifdef __BIG_ENDIAN__

#warning Image dump not supported on big endian machines

static int

vga_dump_image (char *filename, struct vga_start *vga)

{

  return 1;

}

#else

typedef struct

{

  unsigned short int type;      /* Magic identifier            */

  unsigned int size;            /* File size in bytes          */

  unsigned short int reserved1, reserved2;

  unsigned int offset;          /* Offset to image data, bytes */

} BMP_HEADER;

typedef struct

{

  unsigned int size;            /* Header size in bytes      */

  int width, height;            /* Width and height of image */

  unsigned short int planes;    /* Number of colour planes   */

  unsigned short int bits;      /* Bits per pixel            */

  unsigned int compression;     /* Compression type          */

  unsigned int imagesize;       /* Image size in bytes       */

  int xresolution, yresolution; /* Pixels per meter          */

  unsigned int ncolours;        /* Number of colours         */

  unsigned int importantcolours;        /* Important colours         */

} INFOHEADER;

/* Dumps a bmp file, based on current image */

static int

vga_dump_image (char *filename, struct vga_state *vga)

{

  int sx = vga->hlen;

  int sy = vga->vlen;

  int i, x = 0, y = 0;

  int pc = vga->ctrl & VGA_CTRL_PC;

  int rbpp = vga->ctrl & VGA_CTRL_CD;

  int bpp = rbpp >> 8;

  BMP_HEADER bh;

  INFOHEADER ih;

  FILE *fo;

  if (!sx || !sy)

    return 1;

  /* 16bpp and 32 bpp will be converted to 24bpp */

  if (bpp == 1 || bpp == 3)

    bpp = 2;

  bh.type = 19778;              /* BM */

  bh.size =

    sizeof (BMP_HEADER) + sizeof (INFOHEADER) + sx * sy * (bpp * 4 + 4) +

    (pc ? 1024 : 0);

  bh.reserved1 = bh.reserved2 = 0;

  bh.offset = sizeof (BMP_HEADER) + sizeof (INFOHEADER) + (pc ? 1024 : 0);

  ih.size = sizeof (INFOHEADER);

  ih.width = sx;

  ih.height = sy;

  ih.planes = 1;

  ih.bits = bpp * 4 + 4;

  ih.compression = 0;

  ih.imagesize = x * y * (bpp * 4 + 4);

  ih.xresolution = ih.yresolution = 0;

  ih.ncolours = 0;               /* should be generated */

  ih.importantcolours = 0;       /* all are important */

  fo = fopen (filename, "wb+");

  if (!fwrite (&bh, sizeof (BMP_HEADER), 1, fo))

    return 1;

  if (!fwrite (&ih, sizeof (INFOHEADER), 1, fo))

    return 1;

  if (pc)

    {                           /* Write palette? */

      for (i = 0; i < 256; i++)

        {

          unsigned long val, d;

          d = vga->palette[vga->pindex][i];

          val = (d >> 0) & 0xff; /* Blue */

          val |= (d >> 8) & 0xff;       /* Green */

          val |= (d >> 16) & 0xff;      /* Red */

          if (!fwrite (&val, sizeof (val), 1, fo))

            return 1;

        }

    }

  /* Data is stored upside down */

  for (y = sy - 1; y >= 0; y--)

    {

      int align = 4 - ((bpp + 1) * sx) % 4;

      int zero = 0;

      for (x = 0; x < sx; x++)

        {

          unsigned long pixel =

            eval_direct32 (vga->vbar[vga->vbindex] + (y * sx + x) * (bpp + 1),

                           0, 0);

          if (!fwrite (&pixel, sizeof (pixel), 1, fo))

            return 1;

        }

      if (!fwrite (&zero, align, 1, fo))

        return 1;

    }

  fclose (fo);

  return 0;

}

#endif /* !__BIG_ENDIAN__ */

void

vga_job (void *dat)

{

  struct vga_state *vga = dat;

  /* dump the image? */

  char temp[STR_SIZE];

  sprintf (temp, "%s%04i.bmp", vga->filename, vga->pics++);

  vga_dump_image (temp, vga);

  SCHED_ADD (vga_job, dat, vga->refresh_rate);

}

/* Reset all VGAs */

void

vga_reset (void *dat)

{

  struct vga_state *vga = dat;

  int i;

  /* Init palette */

  for (i = 0; i < 256; i++)

    vga->palette[0][i] = vga->palette[1][i] = 0;

  vga->ctrl = vga->stat = vga->htim = vga->vtim = 0;

  vga->hlen = vga->vlen = 0;

  vga->vbar[0] = vga->vbar[1] = 0;

  /* Init screen dumping machine */

  vga->pics = 0;

  vga->pindex = 0;

  vga->vbindex = 0;

  SCHED_ADD (vga_job, dat, vga->refresh_rate);

}

/*----------------------------------------------------[ VGA Configuration ]---*/

static void

vga_enabled (union param_val val, void *dat)

{

  struct vga_state *vga = dat;

  vga->enabled = val.int_val;

}

static void

vga_baseaddr (union param_val val, void *dat)

{

  struct vga_state *vga = dat;

  vga->baseaddr = val.addr_val;

}

static void

vga_irq (union param_val val, void *dat)

{

  struct vga_state *vga = dat;

  vga->irq = val.int_val;

}

static void

vga_refresh_rate (union param_val val, void *dat)

{

  struct vga_state *vga = dat;

  vga->refresh_rate = val.int_val;

}

/*---------------------------------------------------------------------------*/

/*!Set the VGA output file

   Free any previously allocated value.

   @param[in] val  The value to use

   @param[in] dat  The config data structure                                 */

/*---------------------------------------------------------------------------*/

static void

vga_filename (union param_val  val,

              void            *dat)

{

  struct vga_state *vga = dat;

  if (NULL != vga->filename)

    {

      free (vga->filename);

      vga->filename = NULL;

    }

  if (NULL == (vga->filename = strdup (val.str_val)))

    {

      fprintf (stderr, "ERROR: Out of memory\n");

      exit (-1);

    }

}       /* vga_filename() */

/*---------------------------------------------------------------------------*/

/*!Initialize a new VGA configuration

   ALL parameters are set explicitly to default values.                      */

/*---------------------------------------------------------------------------*/

static void *

vga_sec_start ()

{

  struct vga_state *new = malloc (sizeof (struct vga_state));

  if (!new)

    {

      fprintf (stderr, "Peripheral VGA: Run out of memory\n");

      exit (-1);

    }

  new->enabled      = 1;

  new->baseaddr     = 0;

  new->irq          = 0;

  new->refresh_rate = 1000000000000ULL / 50ULL / config.sim.clkcycle_ps;

  new->filename     = strdup ("vga_out");

  return new;

}       /* vga_sec_start() */

static void

vga_sec_end (void *dat)

{

  struct vga_state *vga = dat;

  struct mem_ops ops;

  if (!vga->enabled)

    {

      free (vga->filename);

      free (vga);

      return;

    }

  memset (&ops, 0, sizeof (struct mem_ops));

  ops.readfunc32 = vga_read32;

  ops.writefunc32 = vga_write32;

  ops.write_dat32 = dat;

  ops.read_dat32 = dat;

  /* FIXME: Correct delay? */

  ops.delayr = 2;

  ops.delayw = 2;

  reg_mem_area (vga->baseaddr, VGA_ADDR_SPACE, 0, &ops);

  reg_sim_reset (vga_reset, dat);

}

/*---------------------------------------------------------------------------*/

/*!Create a new VGA configuration

   ALL parameters are set explicitly to default values. Alternative naming for

   file parameter supported.                                                 */

/*---------------------------------------------------------------------------*/

void

reg_vga_sec ()

{

  struct config_section *sec =

    reg_config_sec ("vga", vga_sec_start, vga_sec_end);

  reg_config_param (sec, "baseaddr",     PARAMT_ADDR, vga_baseaddr);

  reg_config_param (sec, "enabled",      PARAMT_INT, vga_enabled);

  reg_config_param (sec, "irq",          PARAMT_INT, vga_irq);

  reg_config_param (sec, "refresh_rate", PARAMT_INT, vga_refresh_rate);

  reg_config_param (sec, "txfile",       PARAMT_STR, vga_filename);

  reg_config_param (sec, "filename",     PARAMT_STR, vga_filename);

}       /* reg_vga_sec() */