Bochs/bochs/iodev/devices.cc

/////////////////////////////////////////////////////////////////////////
// $Id: devices.cc,v 1.42 2002-11-10 08:12:12 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2002  MandrakeSoft S.A.
//
//    MandrakeSoft S.A.
//    43, rue d'Aboukir
//    75002 Paris - France
//    http://www.linux-mandrake.com/
//    http://www.mandrakesoft.com/
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA


#include "bochs.h"
#define LOG_THIS bx_devices.



/* main memory size (in Kbytes)
 * subtract 1k for extended BIOS area
 * report only base memory, not extended mem
 */
#define BASE_MEMORY_IN_K  640


bx_devices_c bx_devices;




// constructor for bx_devices_c
bx_devices_c::bx_devices_c(void)
{
  put("DEV");
  settype(DEVLOG);

#if BX_PCI_SUPPORT
  pluginPciBridge = &stubPci;
  pluginPci2IsaBridge = NULL;
#endif
  pit = NULL;
  pluginKeyboard = &stubKeyboard;
  pluginDmaDevice = &stubDma;
  pluginFloppyDevice = &stubFloppy;
  pluginBiosDevice = NULL;
  pluginCmosDevice = &stubCmos;
  pluginSerialDevice = NULL;
  pluginParallelDevice = NULL;
  pluginUnmapped = NULL;
  pluginVgaDevice = &stubVga;
  pluginPicDevice = &stubPic;
  pluginHardDrive = &stubHardDrive;
  sb16 = NULL;
  ne2k = NULL;
  g2h = NULL;
#if BX_IODEBUG_SUPPORT
  iodebug = NULL;
#endif
}


bx_devices_c::~bx_devices_c(void)
{
  // nothing needed for now
  BX_DEBUG(("Exit."));
  timer_handle = BX_NULL_TIMER_HANDLE;
}


  void
bx_devices_c::init(BX_MEM_C *newmem)
{
  unsigned i;

  BX_DEBUG(("Init $Id: devices.cc,v 1.42 2002-11-10 08:12:12 vruppert Exp $"));
  mem = newmem;

  /* no read / write handlers defined */
  num_read_handles = 0;
  num_write_handles = 0;

  /* set unused elements to appropriate values */
  for (i=0; i < BX_MAX_IO_DEVICES; i++) {
    io_read_handler[i].funct  = NULL;
    io_write_handler[i].funct = NULL;
    }

  /* set no-default handlers, will be overwritten by the real default handler */
  io_read_handler[BX_DEFAULT_IO_DEVICE].handler_name  = "Default";
  io_read_handler[BX_DEFAULT_IO_DEVICE].funct         = &default_read_handler;
  io_read_handler[BX_DEFAULT_IO_DEVICE].this_ptr      = NULL;
  io_write_handler[BX_DEFAULT_IO_DEVICE].handler_name = "Default";
  io_write_handler[BX_DEFAULT_IO_DEVICE].funct        = &default_write_handler;
  io_write_handler[BX_DEFAULT_IO_DEVICE].this_ptr     = NULL;

  /* set handlers to the default one */
  for (i=0; i < 0x10000; i++) {
    read_handler_id[i] = BX_DEFAULT_IO_DEVICE; 
    write_handler_id[i] = BX_DEFAULT_IO_DEVICE;
    }

  for (i=0; i < BX_MAX_IRQS; i++) {
    irq_handler_name[i] = NULL;
    }

  // BBD: At present, the only difference between "core" and "optional"
  // plugins is that initialization and reset of optional plugins is handled
  // by the plugin device list ().  Init and reset of core plugins is done
  // "by hand" in this file.  Basically, we're using core plugins when we
  // want to control the init order.
  //
  // CB: UNMAPPED and BIOSDEV should maybe be optional
  PLUG_load_plugin(unmapped, PLUGTYPE_CORE);
  PLUG_load_plugin(biosdev, PLUGTYPE_CORE);
  PLUG_load_plugin(cmos, PLUGTYPE_CORE);
  PLUG_load_plugin(dma, PLUGTYPE_CORE);
  PLUG_load_plugin(pic, PLUGTYPE_CORE);
  PLUG_load_plugin(vga, PLUGTYPE_CORE);
  PLUG_load_plugin(floppy, PLUGTYPE_CORE);
  PLUG_load_plugin(harddrv, PLUGTYPE_OPTIONAL);
  PLUG_load_plugin(keyboard, PLUGTYPE_OPTIONAL);
  if (is_serial_enabled ())
    PLUG_load_plugin(serial, PLUGTYPE_OPTIONAL);
  if (is_parallel_enabled ()) 
    PLUG_load_plugin(parallel, PLUGTYPE_OPTIONAL);

  // Start with registering the default (unmapped) handler
  pluginUnmapped->init ();

#if BX_PCI_SUPPORT
  // PCI logic (i440FX)
  if (bx_options.Oi440FXSupport->get ()) {
    PLUG_load_plugin(pci, PLUGTYPE_OPTIONAL);
    PLUG_load_plugin(pci2isa, PLUGTYPE_OPTIONAL);
  }
#endif

#if BX_SUPPORT_APIC
    // I/O APIC 82093AA
    ioapic = & bx_ioapic;
    ioapic->init ();
#endif

  // BIOS log 
  pluginBiosDevice->init ();

  // CMOS RAM & RTC
  pluginCmosDevice->init ();

  /*--- 8237 DMA ---*/
  pluginDmaDevice->init();

  //--- FLOPPY ---
  pluginFloppyDevice->init();

#if BX_SUPPORT_SB16
  //--- SOUND ---
  sb16 = &bx_sb16;
  sb16->init();
#endif

  /*--- VGA adapter ---*/
  pluginVgaDevice->init ();

  /*--- 8259A PIC ---*/
  pluginPicDevice->init();

  /*--- 8254 PIT ---*/
  pit = & bx_pit;
  pit->init();

#if BX_USE_SLOWDOWN_TIMER
  bx_slowdown_timer.init();
#endif

#if BX_IODEBUG_SUPPORT
  iodebug = &bx_iodebug;
  iodebug->init();
#endif

#if BX_NE2K_SUPPORT
  // NE2000 NIC
  ne2k = &bx_ne2k;
  ne2k->init();
  BX_DEBUG(("ne2k"));
#endif  // #if BX_NE2K_SUPPORT

#if 0
  // Guest to Host interface.  Used with special guest drivers
  // which move data to/from the host environment.
  g2h = &bx_g2h;
  g2h->init();
#endif

  // system hardware
  register_io_read_handler( this,
                            &read_handler,
                            0x0092,
                            "Port 92h System Control" );
  register_io_write_handler(this,
                            &write_handler,
                            0x0092,
                            "Port 92h System Control" );

  // misc. CMOS
  Bit16u extended_memory_in_k = mem->get_memory_in_k() - 1024;
  DEV_cmos_set_reg(0x15, (Bit8u) BASE_MEMORY_IN_K);
  DEV_cmos_set_reg(0x16, (Bit8u) (BASE_MEMORY_IN_K >> 8));
  DEV_cmos_set_reg(0x17, (Bit8u) extended_memory_in_k);
  DEV_cmos_set_reg(0x18, (Bit8u) (extended_memory_in_k >> 8));
  DEV_cmos_set_reg(0x30, (Bit8u) extended_memory_in_k);
  DEV_cmos_set_reg(0x31, (Bit8u) (extended_memory_in_k >> 8));

  Bit16u extended_memory_in_64k = mem->get_memory_in_k() > 16384 ? (mem->get_memory_in_k() - 16384) / 64 : 0;
  DEV_cmos_set_reg(0x34, (Bit8u) extended_memory_in_64k);
  DEV_cmos_set_reg(0x35, (Bit8u) (extended_memory_in_64k >> 8));

  /* now perform checksum of CMOS memory */
  DEV_cmos_checksum();

  if (timer_handle != BX_NULL_TIMER_HANDLE) {
    timer_handle = bx_pc_system.register_timer( this, timer_handler,
      (unsigned) BX_IODEV_HANDLER_PERIOD, 1, 1, "devices.cc");
  }

  // Clear fields for bulk IO acceleration transfers.
  bulkIOHostAddr = 0;
  bulkIOQuantumsRequested = 0;
  bulkIOQuantumsTransferred = 0;

  bx_init_plugins();
}


  void
bx_devices_c::reset(unsigned type)
{
  pluginUnmapped->reset(type);
#if BX_PCI_SUPPORT
  if (bx_options.Oi440FXSupport->get ()) {
    pluginPciBridge->reset(type);
    pluginPci2IsaBridge->reset(type);
  }
#endif
#if BX_SUPPORT_IOAPIC
  ioapic->reset (type);
#endif
  pluginBiosDevice->reset(type);
  pluginCmosDevice->reset(type);
  pluginDmaDevice->reset(type);
  pluginFloppyDevice->reset(type);
#if BX_SUPPORT_SB16
  sb16->reset(type);
#endif
  pluginVgaDevice->reset(type);
  pluginPicDevice->reset(type);
  pit->reset(type);
#if BX_USE_SLOWDOWN_TIMER
  bx_slowdown_timer.reset(type);
#endif
#if BX_IODEBUG_SUPPORT
  iodebug->reset(type);
#endif
#if BX_NE2K_SUPPORT
  ne2k->reset(type);
#endif

  bx_reset_plugins(type);
}


  Bit32u
bx_devices_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_DEV_SMF
  bx_devices_c *class_ptr = (bx_devices_c *) this_ptr;

  return( class_ptr->port92_read(address, io_len) );
}


  Bit32u
bx_devices_c::port92_read(Bit32u address, unsigned io_len)
{
#else
  UNUSED(this_ptr);
#endif  // !BX_USE_DEV_SMF
  if (io_len > 1)
    BX_PANIC(("port 92h: io read from address %08x, len=%u",
             (unsigned) address, (unsigned) io_len));

  BX_DEBUG(("port92h read partially supported!!!"));
  BX_DEBUG(("  returning %02x", (unsigned) (BX_GET_ENABLE_A20() << 1)));
  return(BX_GET_ENABLE_A20() << 1);
}


  void
bx_devices_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_DEV_SMF
  bx_devices_c *class_ptr = (bx_devices_c *) this_ptr;

  class_ptr->port92_write(address, value, io_len);
}

  void
bx_devices_c::port92_write(Bit32u address, Bit32u value, unsigned io_len)
{
#else
  UNUSED(this_ptr);
#endif  // !BX_USE_DEV_SMF
  bx_bool bx_cpu_reset;

  if (io_len > 1)
    BX_PANIC(("port 92h: io read from address %08x, len=%u",
             (unsigned) address, (unsigned) io_len));

  BX_DEBUG(("port92h write of %02x partially supported!!!",
    (unsigned) value));
  BX_DEBUG(("A20: set_enable_a20() called"));
  BX_SET_ENABLE_A20( (value & 0x02) >> 1 );
  BX_DEBUG(("A20: now %u", (unsigned) BX_GET_ENABLE_A20()));
  bx_cpu_reset  = (value & 0x01); /* high speed reset */
  if (bx_cpu_reset) {
    BX_PANIC(("PORT 92h write: CPU reset requested!"));
    }
}


// This defines a no-default read handler, 
// so Bochs does not segfault if unmapped is not loaded
  Bit32u
bx_devices_c::default_read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
  UNUSED(this_ptr);
  BX_PANIC(("No default io-read handler found for 0x%04x/%d. Unmapped io-device not loaded ?", address, io_len));
  return 0xffffffff;
}

// This defines a no-default write handler, 
// so Bochs does not segfault if unmapped is not loaded
  void
bx_devices_c::default_write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
  UNUSED(this_ptr);
  BX_PANIC(("No default io-write handler found for 0x%04x/%d. Unmapped io-device not loaded ?", address, io_len));
}

  void
bx_devices_c::timer_handler(void *this_ptr)
{
  bx_devices_c *class_ptr = (bx_devices_c *) this_ptr;

  class_ptr->timer();
}

  void
bx_devices_c::timer()
{
#if (BX_USE_NEW_PIT==0)
  if ( pit->periodic( BX_IODEV_HANDLER_PERIOD ) ) {
    // This is a hack to make the IRQ0 work
    DEV_pic_lower_irq(0);
    DEV_pic_raise_irq(0);
    }
#endif


  // separate calls to bx_gui->handle_events from the keyboard code.
  {
    static int multiple=0;
    if ( ++multiple==10)
    {
      multiple=0;
      SIM->periodic ();
      if (!BX_CPU(0)->kill_bochs_request)
	bx_gui->handle_events();
    }
  }

// KPL Removed lapic periodic timer registration here.
}


  bx_bool
bx_devices_c::register_irq(unsigned irq, const char *name)
{
  if (irq >= BX_MAX_IRQS) {
    BX_PANIC(("IO device %s registered with IRQ=%d above %u",
             name, irq, (unsigned) BX_MAX_IRQS-1));
    return false;
    }
  if (irq_handler_name[irq]) {
    BX_PANIC(("IRQ %u conflict, %s with %s", irq,
      irq_handler_name[irq], name));
    return false;
    }
  irq_handler_name[irq] = name;
  return true;
}

  bx_bool
bx_devices_c::unregister_irq(unsigned irq, const char *name)
{
  if (irq >= BX_MAX_IRQS) {
    BX_PANIC(("IO device %s tried to unregister IRQ %d above %u",
             name, irq, (unsigned) BX_MAX_IRQS-1));
    return false;
    }

  if (!irq_handler_name[irq]) {
    BX_INFO(("IO device %s tried to unregister IRQ %d, not registered",
	      name, irq));
    return false;
  }

  if (strcmp(irq_handler_name[irq], name)) {
    BX_INFO(("IRQ %u not registered to %s but to %s", irq,
      name, irq_handler_name[irq]));
    return false;
    }
  irq_handler_name[irq] = NULL;
  return true;
}

  bx_bool
bx_devices_c::register_io_read_handler( void *this_ptr, bx_read_handler_t f,
                                        Bit32u addr, const char *name )
{
  unsigned handle;

  addr &= 0x0000ffff;

  /* first find existing handle for function or create new one */
  for (handle=0; handle < num_read_handles; handle++) {
    if (io_read_handler[handle].funct == f) break;
    }

  if (handle >= num_read_handles) {
    /* no existing handle found, create new one */
    if (num_read_handles >= BX_DEFAULT_IO_DEVICE) {
      BX_INFO(("too many IO devices installed."));
      BX_PANIC(("  try increasing BX_MAX_IO_DEVICES"));
      }
    num_read_handles++;
    io_read_handler[handle].funct          = f;
    io_read_handler[handle].this_ptr       = this_ptr;
    io_read_handler[handle].handler_name   = name;
    }

  /* change table to reflect new handler id for that address */
  if (read_handler_id[addr] < BX_DEFAULT_IO_DEVICE) {
    // another handler is already registered for that address
    BX_ERROR(("IO device address conflict(read) at IO address %Xh",
      (unsigned) addr));
    BX_ERROR(("  conflicting devices: %s & %s",
      io_read_handler[handle].handler_name, io_read_handler[read_handler_id[addr]].handler_name));
    return false; // address not available, return false.
    }
  read_handler_id[addr] = handle;
  return true; // address mapped successfully
}



  bx_bool
bx_devices_c::register_io_write_handler( void *this_ptr, bx_write_handler_t f,
                                        Bit32u addr, const char *name )
{
  unsigned handle;

  addr &= 0x0000ffff;

  /* first find existing handle for function or create new one */
  for (handle=0; handle < num_write_handles; handle++) {
    if (io_write_handler[handle].funct == f) break;
    }

  if (handle >= num_write_handles) {
    /* no existing handle found, create new one */
    if (num_write_handles >= BX_DEFAULT_IO_DEVICE) {
      BX_INFO(("too many IO devices installed."));
      BX_PANIC(("  try increasing BX_MAX_IO_DEVICES"));
      }
    num_write_handles++;
    io_write_handler[handle].funct          = f;
    io_write_handler[handle].this_ptr       = this_ptr;
    io_write_handler[handle].handler_name   = name;
    }

  /* change table to reflect new handler id for that address */
  if (write_handler_id[addr] < BX_DEFAULT_IO_DEVICE) {
    // another handler is already registered for that address
    BX_ERROR(("IO device address conflict(write) at IO address %Xh",
      (unsigned) addr));
    BX_ERROR(("  conflicting devices: %s & %s",
      io_write_handler[handle].handler_name, io_write_handler[write_handler_id[addr]].handler_name));
    return false; //unable to map iodevice.
    }
  write_handler_id[addr] = handle;
  return true; // done!
}


// Registration of default handlers (mainly be the unmapped device)
// The trick here is to define a handler for the max index, so
// unregisterd io address will get handled by the default function
// This will be helpful when we want to unregister io handlers

  bx_bool
bx_devices_c::register_default_io_read_handler( void *this_ptr, bx_read_handler_t f,
                                        const char *name )
{
  unsigned handle;

  /* handle is fixed to the default I/O device */
  handle = BX_DEFAULT_IO_DEVICE;

  if (strcmp(io_read_handler[handle].handler_name, "Default")) {
    BX_ERROR(("Default io read handler already registered '%s'",io_read_handler[handle].handler_name));
    return false;
    }

  io_read_handler[handle].funct          = f;
  io_read_handler[handle].this_ptr       = this_ptr;
  io_read_handler[handle].handler_name   = name;

  return true; 
}



  bx_bool
bx_devices_c::register_default_io_write_handler( void *this_ptr, bx_write_handler_t f,
                                        const char *name )
{
  unsigned handle;

  /* handle is fixed to the MAX */
  handle = BX_DEFAULT_IO_DEVICE;

  if (strcmp(io_write_handler[handle].handler_name, "Default")) {
    BX_ERROR(("Default io write handler already registered '%s'",io_write_handler[handle].handler_name));
    return false;
    }

  io_write_handler[handle].funct          = f;
  io_write_handler[handle].this_ptr       = this_ptr;
  io_write_handler[handle].handler_name   = name;

  return true; 
}



/*
 * Read a byte of data from the IO memory address space
 */

  Bit32u
bx_devices_c::inp(Bit16u addr, unsigned io_len)
{
  Bit8u handle;
  Bit32u ret;

  BX_INSTR_INP(addr, io_len);

  handle = read_handler_id[addr];
  // FIXME, we want to make sure that there is a default handler there
  ret = (* io_read_handler[handle].funct)(io_read_handler[handle].this_ptr,
                           (Bit32u) addr, io_len);
  BX_INSTR_INP2(addr, io_len, ret);
  BX_DBG_IO_REPORT(addr, io_len, BX_READ, ret);
  return(ret);
}


/*
 * Write a byte of data to the IO memory address space.
 */

  void
bx_devices_c::outp(Bit16u addr, Bit32u value, unsigned io_len)
{
  Bit8u handle;

  BX_INSTR_OUTP(addr, io_len);
  BX_INSTR_OUTP2(addr, io_len, value);

  BX_DBG_IO_REPORT(addr, io_len, BX_WRITE, value);
  handle = write_handler_id[addr];
  // FIXME, we want to make sure that there is a default handler there
  (* io_write_handler[handle].funct)(io_write_handler[handle].this_ptr,
                     (Bit32u) addr, value, io_len);
}

bx_bool bx_devices_c::is_serial_enabled ()
{
  for (int i=0; i<BX_N_SERIAL_PORTS; i++) {
    if (SIM->get_param_bool (BXP_COMx_ENABLED(i+1))->get())
      return true;
  }
  return false;
}

bx_bool bx_devices_c::is_parallel_enabled ()
{
  for (int i=0; i<BX_N_PARALLEL_PORTS; i++) {
    if (SIM->get_param_bool (BXP_PARPORTx_ENABLED(i+1))->get())
      return true;
  }
  return false;
}