Bochs/bochs/iodev/iodev.h

/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2002-2011  The Bochs Project
//
//  I/O port handlers API Copyright (C) 2003 by Frank Cornelis
//
//  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
//
/////////////////////////////////////////////////////////////////////////

#ifndef IODEV_H
#define IODEV_H

#include "bochs.h"
#include "plugin.h"
#include "param_names.h"

/* number of IRQ lines supported.  In an ISA PC there are two
   PIC chips cascaded together.  each has 8 IRQ lines, so there
   should be 16 IRQ's total */
#define BX_MAX_IRQS 16

/* size of internal buffer for mouse devices */
#define BX_MOUSE_BUFF_SIZE 48

typedef Bit32u (*bx_read_handler_t)(void *, Bit32u, unsigned);
typedef void   (*bx_write_handler_t)(void *, Bit32u, Bit32u, unsigned);

typedef bx_bool (*bx_keyb_enq_t)(void *, Bit8u *);
typedef void (*bx_mouse_enq_t)(void *, int, int, int, unsigned);
typedef void (*bx_mouse_enabled_changed_t)(void *, bx_bool);

#if BX_USE_DEV_SMF
#  define BX_DEV_SMF  static
#  define BX_DEV_THIS bx_devices.
#else
#  define BX_DEV_SMF
#  define BX_DEV_THIS this->
#endif

//////////////////////////////////////////////////////////////////////
// bx_devmodel_c declaration
//////////////////////////////////////////////////////////////////////

// This class defines virtual methods that are common to all devices.
// Child classes do not need to implement all of them, because in this
// definition they are defined as empty, as opposed to being pure
// virtual (= 0).
class BOCHSAPI bx_devmodel_c : public logfunctions {
  public:
  virtual ~bx_devmodel_c() {}
  virtual void init(void) {}
  virtual void reset(unsigned type) {}
  virtual void register_state(void) {}
  virtual void after_restore_state(void) {}
#if BX_DEBUGGER
  virtual void debug_dump(void) {}
#endif
};

//////////////////////////////////////////////////////////////////////
// declare stubs for PCI devices
//////////////////////////////////////////////////////////////////////

class bx_list_c;
class device_image_t;
class LOWLEVEL_CDROM;

// the best should be deriving of bx_pci_device_stub_c from bx_devmodel_c
// but it make serious problems for cirrus_svga device
class BOCHSAPI bx_pci_device_stub_c {
public:
  bx_pci_device_stub_c(): pci_rom(NULL), pci_rom_size(0) {}
  virtual ~bx_pci_device_stub_c() {
    if (pci_rom != NULL) delete [] pci_rom;
  }

  virtual Bit32u pci_read_handler(Bit8u address, unsigned io_len) {
    return 0;
  }

  virtual void pci_write_handler(Bit8u address, Bit32u value, unsigned io_len) {}

  void register_pci_state(bx_list_c *list);

  void load_pci_rom(const char *path);

protected:
  Bit8u pci_conf[256];
  Bit32u pci_base_address[6];
  Bit8u  *pci_rom;
  Bit32u pci_rom_address;
  Bit32u pci_rom_size;
};

//////////////////////////////////////////////////////////////////////
// declare stubs for devices
//////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////
#define STUBFUNC(dev,method) \
   pluginlog->panic("%s called in %s stub. you must not have loaded the %s plugin", #dev, #method, #dev)
//////////////////////////////////////////////////////////////////////

class BOCHSAPI bx_keyb_stub_c : public bx_devmodel_c {
public:
  virtual ~bx_keyb_stub_c() {}
  // stubs for bx_keyb_c methods
  virtual void gen_scancode(Bit32u key) {
    STUBFUNC(keyboard, gen_scancode);
  }
  virtual void paste_bytes(Bit8u *data, Bit32s length) {
    STUBFUNC(keyboard, paste_bytes);
  }
};

class BOCHSAPI bx_hard_drive_stub_c : public bx_devmodel_c {
public:
  virtual void   init() {
    STUBFUNC(HD, init);
  }
  virtual void   reset(unsigned type) {
    STUBFUNC(HD, reset);
  }
  virtual Bit32u   get_first_cd_handle(void) {
    STUBFUNC(HD, get_first_cd_handle); return 0;
  }
  virtual unsigned get_cd_media_status(Bit32u handle) {
    STUBFUNC(HD, get_cd_media_status); return 0;
  }
  virtual unsigned set_cd_media_status(Bit32u handle, unsigned status) {
    STUBFUNC(HD, set_cd_media_status); return 0;
  }
  virtual Bit32u virt_read_handler(Bit32u address, unsigned io_len)
  {
    STUBFUNC(HD, virt_read_handler); return 0;
  }
  virtual void   virt_write_handler(Bit32u address,
      Bit32u value, unsigned io_len)
  {
    STUBFUNC(HD, virt_write_handler);
  }
  virtual bx_bool bmdma_read_sector(Bit8u channel, Bit8u *buffer, Bit32u *sector_size) {
    STUBFUNC(HD, bmdma_read_sector); return 0;
  }
  virtual bx_bool bmdma_write_sector(Bit8u channel, Bit8u *buffer) {
    STUBFUNC(HD, bmdma_write_sector); return 0;
  }
  virtual void bmdma_complete(Bit8u channel) {
    STUBFUNC(HD, bmdma_complete);
  }
};

class BOCHSAPI bx_floppy_stub_c : public bx_devmodel_c {
public:
  virtual unsigned set_media_status(unsigned drive, unsigned status) {
    STUBFUNC(floppy, set_media_status); return 0;
  }
};

class BOCHSAPI bx_cmos_stub_c : public bx_devmodel_c {
public:
  virtual Bit32u get_reg(unsigned reg) {
    STUBFUNC(cmos, get_reg); return 0;
  }
  virtual void set_reg(unsigned reg, Bit32u val) {
    STUBFUNC(cmos, set_reg);
  }
  virtual time_t get_timeval() {
    return 0;
  }
  virtual void checksum_cmos(void) {
    STUBFUNC(cmos, checksum);
  }
};

class BOCHSAPI bx_dma_stub_c : public bx_devmodel_c {
public:
  virtual unsigned registerDMA8Channel(
    unsigned channel,
    void (* dmaRead)(Bit8u *data_byte),
    void (* dmaWrite)(Bit8u *data_byte),
    const char *name)
  {
    STUBFUNC(dma, registerDMA8Channel); return 0;
  }
  virtual unsigned registerDMA16Channel(
    unsigned channel,
    void (* dmaRead)(Bit16u *data_word),
    void (* dmaWrite)(Bit16u *data_word),
    const char *name)
  {
    STUBFUNC(dma, registerDMA16Channel); return 0;
  }
  virtual unsigned unregisterDMAChannel(unsigned channel) {
    STUBFUNC(dma, unregisterDMAChannel); return 0;
  }
  virtual unsigned get_TC(void) {
    STUBFUNC(dma, get_TC); return 0;
  }
  virtual void set_DRQ(unsigned channel, bx_bool val) {
    STUBFUNC(dma, set_DRQ);
  }
  virtual void raise_HLDA(void) {
    STUBFUNC(dma, raise_HLDA);
  }
};

class BOCHSAPI bx_pic_stub_c : public bx_devmodel_c {
public:
  virtual void raise_irq(unsigned irq_no) {
    STUBFUNC(pic, raise_irq);
  }
  virtual void lower_irq(unsigned irq_no) {
    STUBFUNC(pic, lower_irq);
  }
  virtual void set_mode(bx_bool ma_sl, Bit8u mode) {
    STUBFUNC(pic, set_mode);
  }
  virtual Bit8u IAC(void) {
    STUBFUNC(pic, IAC); return 0;
  }
};

class BOCHSAPI bx_vga_stub_c : public bx_devmodel_c {
public:
  virtual void redraw_area(unsigned x0, unsigned y0,
                           unsigned width, unsigned height) {
    STUBFUNC(vga, redraw_area);
  }
  virtual Bit8u mem_read(bx_phy_address addr) {
    STUBFUNC(vga, mem_read);  return 0;
  }
  virtual void mem_write(bx_phy_address addr, Bit8u value) {
    STUBFUNC(vga, mem_write);
  }
  virtual int get_snapshot_mode(void) {
    STUBFUNC(vga, get_snapshot_mode);
    return 0;
  }
  virtual void get_text_snapshot(Bit8u **text_snapshot,
                                 unsigned *txHeight, unsigned *txWidth) {
    STUBFUNC(vga, get_text_snapshot);
  }
  virtual Bit32u get_gfx_snapshot(Bit8u **snapshot_ptr, Bit8u **palette_ptr,
                                  unsigned *iHeight, unsigned *iWidth, unsigned *iDepth) {
    STUBFUNC(vga, get_gfx_snapshot);
    return 0;
  }
  virtual void trigger_timer(void *this_ptr) {
    STUBFUNC(vga, trigger_timer);
  }
  virtual Bit8u get_actl_palette_idx(Bit8u index) {
    return 0;
  }
  virtual bx_bool vbe_set_base_addr(Bit32u *addr, Bit8u *pci_conf) {
    return 0;
  }
};

class BOCHSAPI bx_pci_bridge_stub_c : public bx_devmodel_c, public bx_pci_device_stub_c {
public:
  virtual bx_bool register_pci_handlers(bx_pci_device_stub_c *device,
                                        Bit8u *devfunc, const char *name,
                                        const char *descr)
  {
    STUBFUNC(pci, register_pci_handlers); return 0;
  }
  virtual bx_bool is_pci_device(const char *name) {
    return 0;
  }
  virtual bx_bool pci_set_base_mem(void *this_ptr, memory_handler_t f1, memory_handler_t f2,
                                   Bit32u *addr, Bit8u *pci_conf, unsigned size) {
    STUBFUNC(pci, pci_set_base_mem);
    return 0;
  }

  virtual bx_bool pci_set_base_io(void *this_ptr, bx_read_handler_t f1, bx_write_handler_t f2,
                                  Bit32u *addr, Bit8u *pci_conf, unsigned size,
                                  const Bit8u *iomask, const char *name) {
    STUBFUNC(pci, pci_set_base_io);
    return 0;
  }

  virtual Bit8u rd_memType(Bit32u addr) { return 0; }
  virtual Bit8u wr_memType(Bit32u addr) { return 0; }
};

class BOCHSAPI bx_pci2isa_stub_c : public bx_devmodel_c, public bx_pci_device_stub_c {
public:
  virtual void pci_set_irq (Bit8u devfunc, unsigned line, bx_bool level) {
    STUBFUNC(pci2isa, pci_set_irq);
  }
};

class BOCHSAPI bx_pci_ide_stub_c : public bx_devmodel_c, public bx_pci_device_stub_c {
public:
  virtual bx_bool bmdma_present(void) {
    return 0;
  }
  virtual void bmdma_set_irq(Bit8u channel) {}
};

class BOCHSAPI bx_ne2k_stub_c : public bx_devmodel_c {
public:
  virtual void print_info(FILE *file, int page, int reg, int nodups) {}
};

class BOCHSAPI bx_speaker_stub_c : public bx_devmodel_c {
public:
  virtual void beep_on(float frequency) {
    bx_gui->beep_on(frequency);
  }
  virtual void beep_off() {
    bx_gui->beep_off();
  }
};

#if BX_SUPPORT_PCI
class BOCHSAPI bx_acpi_ctrl_stub_c : public bx_devmodel_c, public bx_pci_device_stub_c {
public:
  virtual void generate_smi(Bit8u value) {}
};
#endif

#if BX_SUPPORT_IODEBUG
class BOCHSAPI bx_iodebug_stub_c : public bx_devmodel_c {
public:
  virtual void mem_write(BX_CPU_C *cpu, bx_phy_address addr, unsigned len, void *data) {
    STUBFUNC(iodebug, mem_write);
  }
  virtual void mem_read(BX_CPU_C *cpu, bx_phy_address addr, unsigned len, void *data) {
    STUBFUNC(iodebug, mem_read);
  }
};
#endif

#if BX_SUPPORT_APIC
class BOCHSAPI bx_ioapic_stub_c : public bx_devmodel_c {
public:
  virtual void receive_eoi(Bit8u vector) {}
  virtual void set_irq_level(Bit8u int_in, bx_bool level) {}
};
#endif

#if BX_SUPPORT_GAMEPORT
class BOCHSAPI bx_game_stub_c : public bx_devmodel_c {
public:
  virtual void set_enabled(bx_bool val) {
    STUBFUNC(gameport, set_enabled);
  }
};
#endif

#if BX_SUPPORT_PCIUSB
class BOCHSAPI bx_usb_devctl_stub_c : public bx_devmodel_c {
public:
  virtual int init_device(bx_list_c *portconf, logfunctions *hub, void **dev, bx_list_c *sr_list) {
    STUBFUNC(usb_devctl, init_device); return 0;
  }
  virtual void usb_send_msg(void *dev, int msg) {}
};
#endif

class BOCHSAPI bx_hdimage_ctl_stub_c : public bx_devmodel_c {
public:
  virtual device_image_t* init_image(Bit8u image_mode, Bit64u disk_size, const char *journal) {
    STUBFUNC(hdimage_ctl, init_image); return NULL;
  }
#ifdef LOWLEVEL_CDROM
  virtual LOWLEVEL_CDROM* init_cdrom(const char *dev) {
    STUBFUNC(hdimage_ctl, init_cdrom); return NULL;
  }
#endif
};

#if BX_SUPPORT_SOUNDLOW
class BOCHSAPI bx_soundmod_ctl_stub_c : public bx_devmodel_c {
public:
  virtual void* init_module(const char *type, logfunctions *dev) {
    STUBFUNC(soundmod_ctl, init_module); return NULL;
  }
};
#endif

#if BX_NETWORKING
class BOCHSAPI bx_netmod_ctl_stub_c : public bx_devmodel_c {
public:
  virtual void* init_module(bx_list_c *base, void* rxh, bx_devmodel_c *dev) {
    STUBFUNC(netmod_ctl, init_module); return NULL;
  }
};
#endif

class BOCHSAPI bx_devices_c : public logfunctions {
public:
  bx_devices_c();
 ~bx_devices_c();

  // Initialize the device stubs (in constructur and exit())
  void init_stubs(void);
  // Register I/O addresses and IRQ lines. Initialize any internal
  // structures.  init() is called only once, even if the simulator
  // reboots or is restarted.
  void init(BX_MEM_C *);
  // Enter reset state in response to a reset condition.
  // The types of reset conditions are defined in bochs.h:
  // power-on, hardware, or software.
  void reset(unsigned type);
  // Cleanup the devices when the simulation quits.
  void exit(void);
  void register_state(void);
  void after_restore_state(void);
  BX_MEM_C *mem;  // address space associated with these devices
  bx_bool register_io_read_handler(void *this_ptr, bx_read_handler_t f,
                                   Bit32u addr, const char *name, Bit8u mask);
  bx_bool unregister_io_read_handler(void *this_ptr, bx_read_handler_t f,
                                     Bit32u addr, Bit8u mask);
  bx_bool register_io_write_handler(void *this_ptr, bx_write_handler_t f,
                                    Bit32u addr, const char *name, Bit8u mask);
  bx_bool unregister_io_write_handler(void *this_ptr, bx_write_handler_t f,
                                      Bit32u addr, Bit8u mask);
  bx_bool register_io_read_handler_range(void *this_ptr, bx_read_handler_t f,
                                         Bit32u begin_addr, Bit32u end_addr,
                                         const char *name, Bit8u mask);
  bx_bool register_io_write_handler_range(void *this_ptr, bx_write_handler_t f,
                                          Bit32u begin_addr, Bit32u end_addr,
                                          const char *name, Bit8u mask);
  bx_bool unregister_io_read_handler_range(void *this_ptr, bx_read_handler_t f,
                                           Bit32u begin, Bit32u end, Bit8u mask);
  bx_bool unregister_io_write_handler_range(void *this_ptr, bx_write_handler_t f,
                                            Bit32u begin, Bit32u end, Bit8u mask);
  bx_bool register_default_io_read_handler(void *this_ptr, bx_read_handler_t f, const char *name, Bit8u mask);
  bx_bool register_default_io_write_handler(void *this_ptr, bx_write_handler_t f, const char *name, Bit8u mask);
  bx_bool register_irq(unsigned irq, const char *name);
  bx_bool unregister_irq(unsigned irq, const char *name);
  Bit32u inp(Bit16u addr, unsigned io_len) BX_CPP_AttrRegparmN(2);
  void   outp(Bit16u addr, Bit32u value, unsigned io_len) BX_CPP_AttrRegparmN(3);

  void register_removable_keyboard(void *dev, bx_keyb_enq_t keyb_enq);
  void unregister_removable_keyboard(void *dev);
  void register_default_mouse(void *dev, bx_mouse_enq_t mouse_enq, bx_mouse_enabled_changed_t mouse_enabled_changed);
  void register_removable_mouse(void *dev, bx_mouse_enq_t mouse_enq, bx_mouse_enabled_changed_t mouse_enabled_changed);
  void unregister_removable_mouse(void *dev);
  bx_bool optional_key_enq(Bit8u *scan_code);
  void mouse_enabled_changed(bx_bool enabled);
  void mouse_motion(int delta_x, int delta_y, int delta_z, unsigned button_state);

  static void timer_handler(void *);
  void timer(void);

  bx_pci_bridge_stub_c *pluginPciBridge;
  bx_pci2isa_stub_c *pluginPci2IsaBridge;
  bx_pci_ide_stub_c *pluginPciIdeController;
#if BX_SUPPORT_PCI
  bx_acpi_ctrl_stub_c *pluginACPIController;
#endif
  bx_devmodel_c     *pluginPitDevice;
  bx_keyb_stub_c    *pluginKeyboard;
  bx_dma_stub_c     *pluginDmaDevice;
  bx_floppy_stub_c  *pluginFloppyDevice;
  bx_cmos_stub_c    *pluginCmosDevice;
  bx_vga_stub_c     *pluginVgaDevice;
  bx_pic_stub_c     *pluginPicDevice;
  bx_hard_drive_stub_c *pluginHardDrive;
  bx_hdimage_ctl_stub_c *pluginHDImageCtl;
  bx_ne2k_stub_c    *pluginNE2kDevice;
  bx_speaker_stub_c *pluginSpeaker;
#if BX_SUPPORT_IODEBUG
  bx_iodebug_stub_c *pluginIODebug;
#endif
#if BX_SUPPORT_APIC
  bx_ioapic_stub_c  *pluginIOAPIC;
#endif
#if BX_SUPPORT_GAMEPORT
  bx_game_stub_c  *pluginGameport;
#endif
#if BX_SUPPORT_PCIUSB
  bx_usb_devctl_stub_c  *pluginUsbDevCtl;
#endif
#if BX_SUPPORT_SOUNDLOW
  bx_soundmod_ctl_stub_c  *pluginSoundModCtl;
#endif
#if BX_NETWORKING
  bx_netmod_ctl_stub_c  *pluginNetModCtl;
#endif

  // stub classes that the pointers (above) can point to until a plugin is
  // loaded
  bx_cmos_stub_c stubCmos;
  bx_keyb_stub_c stubKeyboard;
  bx_hard_drive_stub_c stubHardDrive;
  bx_hdimage_ctl_stub_c stubHDImage;
  bx_dma_stub_c  stubDma;
  bx_pic_stub_c  stubPic;
  bx_floppy_stub_c  stubFloppy;
  bx_vga_stub_c  stubVga;
  bx_pci_bridge_stub_c  stubPci;
  bx_pci2isa_stub_c stubPci2Isa;
  bx_pci_ide_stub_c stubPciIde;
  bx_ne2k_stub_c    stubNE2k;
  bx_speaker_stub_c stubSpeaker;
#if BX_SUPPORT_PCI
  bx_acpi_ctrl_stub_c stubACPIController;
#endif
#if BX_SUPPORT_IODEBUG
  bx_iodebug_stub_c stubIODebug;
#endif
#if BX_SUPPORT_APIC
  bx_ioapic_stub_c stubIOAPIC;
#endif
#if BX_SUPPORT_GAMEPORT
  bx_game_stub_c stubGameport;
#endif
#if BX_SUPPORT_PCIUSB
  bx_usb_devctl_stub_c stubUsbDevCtl;
#endif
#if BX_SUPPORT_SOUNDLOW
  bx_soundmod_ctl_stub_c  stubSoundModCtl;
#endif
#if BX_NETWORKING
  bx_netmod_ctl_stub_c  stubNetModCtl;
#endif

  // Some info to pass to devices which can handled bulk IO.  This allows
  // the interface to remain the same for IO devices which can't handle
  // bulk IO.  We should probably implement special INPBulk() and OUTBulk()
  // functions which stick these values in the bx_devices_c class, and
  // then call the normal functions rather than having gross globals
  // variables.
  Bit8u*   bulkIOHostAddr;
  unsigned bulkIOQuantumsRequested;
  unsigned bulkIOQuantumsTransferred;

private:

  struct io_handler_struct {
	struct io_handler_struct *next;
	struct io_handler_struct *prev;	
	void *funct; // C++ type checking is great, but annoying
	void *this_ptr;
	char *handler_name;  // name of device
	int usage_count;
	Bit8u mask;          // io_len mask
  };
  struct io_handler_struct io_read_handlers;
  struct io_handler_struct io_write_handlers;
#define PORTS 0x10000
  struct io_handler_struct **read_port_to_handler;
  struct io_handler_struct **write_port_to_handler;

  // more for informative purposes, the names of the devices which
  // are use each of the IRQ 0..15 lines are stored here
  char *irq_handler_name[BX_MAX_IRQS];

  static Bit32u read_handler(void *this_ptr, Bit32u address, unsigned io_len);
  static void   write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
  BX_DEV_SMF Bit32u port92_read(Bit32u address, unsigned io_len);
  BX_DEV_SMF void   port92_write(Bit32u address, Bit32u value, unsigned io_len);

  static Bit32u default_read_handler(void *this_ptr, Bit32u address, unsigned io_len);
  static void   default_write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);

  bx_bool mouse_captured; // host mouse capture enabled
  Bit8u mouse_type;
  struct {
    void *dev;
    bx_mouse_enq_t enq_event;
    bx_mouse_enabled_changed_t enabled_changed;
  } bx_mouse[2];
  struct {
    void *dev;
    bx_keyb_enq_t enq_event;
  } bx_keyboard;

  int timer_handle;

  bx_bool is_harddrv_enabled();
  bx_bool is_serial_enabled();
  bx_bool is_parallel_enabled();
  bx_bool is_usb_ohci_enabled();
  bx_bool is_usb_uhci_enabled();
  bx_bool is_usb_xhci_enabled();
};

// memory stub has an assumption that there are no memory accesses splitting 4K page
BX_CPP_INLINE void DEV_MEM_READ_PHYSICAL(bx_phy_address phy_addr, unsigned len, Bit8u *ptr)
{
  unsigned remainingInPage = 0x1000 - (phy_addr & 0xfff);
  if (len <= remainingInPage) {
    BX_MEM(0)->readPhysicalPage(NULL, phy_addr, len, ptr);
  }
  else {
    BX_MEM(0)->readPhysicalPage(NULL, phy_addr, remainingInPage, ptr);
    ptr += remainingInPage;
    phy_addr += remainingInPage;
    len -= remainingInPage;
    BX_MEM(0)->readPhysicalPage(NULL, phy_addr, len, ptr);
  }
}

BX_CPP_INLINE void DEV_MEM_READ_PHYSICAL_DMA(bx_phy_address phy_addr, unsigned len, Bit8u *ptr)
{
  while(len > 0) { 
    unsigned remainingInPage = 0x1000 - (phy_addr & 0xfff);
    if (len < remainingInPage) remainingInPage = len;
    BX_MEM(0)->dmaReadPhysicalPage(phy_addr, remainingInPage, ptr);
    ptr += remainingInPage;
    phy_addr += remainingInPage;
    len -= remainingInPage;
  }
}

// memory stub has an assumption that there are no memory accesses splitting 4K page
BX_CPP_INLINE void DEV_MEM_WRITE_PHYSICAL(bx_phy_address phy_addr, unsigned len, Bit8u *ptr)
{
  unsigned remainingInPage = 0x1000 - (phy_addr & 0xfff);
  if (len <= remainingInPage) {
    BX_MEM(0)->writePhysicalPage(NULL, phy_addr, len, ptr);
  }
  else {
    BX_MEM(0)->writePhysicalPage(NULL, phy_addr, remainingInPage, ptr);
    ptr += remainingInPage;
    phy_addr += remainingInPage;
    len -= remainingInPage;
    BX_MEM(0)->writePhysicalPage(NULL, phy_addr, len, ptr);
  }
}

BX_CPP_INLINE void DEV_MEM_WRITE_PHYSICAL_DMA(bx_phy_address phy_addr, unsigned len, Bit8u *ptr)
{
  while(len > 0) { 
    unsigned remainingInPage = 0x1000 - (phy_addr & 0xfff);
    if (len < remainingInPage) remainingInPage = len;
    BX_MEM(0)->dmaWritePhysicalPage(phy_addr, remainingInPage, ptr);
    ptr += remainingInPage;
    phy_addr += remainingInPage;
    len -= remainingInPage;
  }
}

BOCHSAPI extern bx_devices_c bx_devices;

#endif /* IODEV_H */