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Bochs/bochs/iodev/unmapped.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2017 The Bochs Project
//
// 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
//
/////////////////////////////////////////////////////////////////////////
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "iodev.h"
#include "unmapped.h"
#define LOG_THIS theUnmappedDevice->
bx_unmapped_c *theUnmappedDevice = NULL;
int CDECL libunmapped_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
{
theUnmappedDevice = new bx_unmapped_c();
BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theUnmappedDevice, BX_PLUGIN_UNMAPPED);
return(0); // Success
}
void CDECL libunmapped_LTX_plugin_fini(void)
{
delete theUnmappedDevice;
}
bx_unmapped_c::bx_unmapped_c(void)
{
put("unmapped", "UNMAP");
}
bx_unmapped_c::~bx_unmapped_c(void)
{
BX_DEBUG(("Exit"));
}
void bx_unmapped_c::init(void)
{
DEV_register_default_ioread_handler(this, read_handler, "Unmapped", 7);
DEV_register_default_iowrite_handler(this, write_handler, "Unmapped", 7);
s.port80 = 0x00;
s.port8e = 0x00;
s.shutdown = 0;
s.port_e9_hack = SIM->get_param_bool(BXPN_PORT_E9_HACK)->get();
}
// static IO port read callback handler
// redirects to non-static class handler to avoid virtual functions
Bit32u bx_unmapped_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_UM_SMF
bx_unmapped_c *class_ptr = (bx_unmapped_c *) this_ptr;
return class_ptr->read(address, io_len);
}
Bit32u bx_unmapped_c::read(Bit32u address, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_UM_SMF
UNUSED(io_len);
Bit32u retval;
// This function gets called for access to any IO ports which
// are not mapped to any device handler. Reads return 0
if (address >= 0x02e0 && address <= 0x02ef) {
retval = 0;
goto return_from_read;
}
switch (address) {
case 0x80:
retval = BX_UM_THIS s.port80;
break;
case 0x8e:
retval = BX_UM_THIS s.port8e;
break;
// Unused port on ISA - this can be used by the emulated code
// to detect it is running inside Bochs and that the debugging
// features are available (write 0xFF or something on unused
// port 0x80, then read from 0xe9, if value is 0xe9, debug
// output is available) (see write() for that) -- Andreas and Emmanuel
case 0xe9:
if (BX_UM_THIS s.port_e9_hack) {
retval = 0xe9;
}
else {
retval = 0xffffffff;
}
break;
case 0x03df:
retval = 0xffffffff;
BX_DEBUG(("unsupported IO read from port %04x (CGA)", address));
break;
case 0x023a:
case 0x02f8: /* UART */
case 0x02f9: /* UART */
case 0x02fb: /* UART */
case 0x02fc: /* UART */
case 0x02fd: /* UART */
case 0x02ea:
case 0x02eb:
case 0x03e8:
case 0x03e9:
case 0x03ea:
case 0x03eb:
case 0x03ec:
case 0x03ed:
case 0x03f8: /* UART */
case 0x03f9: /* UART */
case 0x03fb: /* UART */
case 0x03fc: /* UART */
case 0x03fd: /* UART */
case 0x17c6:
retval = 0xffffffff;
break;
default:
retval = 0xffffffff;
}
return_from_read:
switch (io_len) {
case 1:
retval = (Bit8u)retval;
BX_DEBUG(("unmapped: 8-bit read from %04x = %02x", address, retval));
break;
case 2:
retval = (Bit16u)retval;
BX_DEBUG(("unmapped: 16-bit read from %04x = %04x", address, retval));
break;
case 4:
BX_DEBUG(("unmapped: 32-bit read from %04x = %08x", address, retval));
break;
default:
BX_PANIC(("unmapped: %d-bit read from %04x = %x", io_len * 8, address, retval));
}
return retval;
}
// static IO port write callback handler
// redirects to non-static class handler to avoid virtual functions
void bx_unmapped_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_UM_SMF
bx_unmapped_c *class_ptr = (bx_unmapped_c *) this_ptr;
class_ptr->write(address, value, io_len);
}
void bx_unmapped_c::write(Bit32u address, Bit32u value, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_UM_SMF
UNUSED(io_len);
// This function gets called for access to any IO ports which
// are not mapped to any device handler. Writes to an unmapped
// IO port are ignored.
if (address >= 0x02e0 && address <= 0x02ef)
goto return_from_write;
switch (address) {
case 0x80: // diagnostic test port to display progress of POST
//BX_DEBUG(("Diagnostic port 80h: write = %02xh", (unsigned) value));
BX_UM_THIS s.port80 = value;
break;
case 0x8e: // ???
BX_UM_THIS s.port8e = value;
break;
// This port doesn't exist on normal ISA architecture. However,
// we define a convention here, to display on the console of the
// system running Bochs, anything that is written to it. The
// idea is to provide debug output very early when writing
// BIOS or OS code for example, without having to bother with
// properly setting up a serial port or anything.
//
// Idea by Andreas Beck (andreas.beck@ggi-project.org)
case 0xe9:
if (BX_UM_THIS s.port_e9_hack) {
putchar(value);
fflush(stdout);
}
break;
case 0xed: // Dummy port used as I/O delay
break;
case 0xee: // ???
break;
case 0x2f2:
case 0x2f3:
case 0x2f4:
case 0x2f5:
case 0x2f6:
case 0x2f7:
case 0x3e8:
case 0x3e9:
case 0x3eb:
case 0x3ec:
case 0x3ed:
// BX_DEBUG(("unsupported IO write to port %04x of %02x", address, value));
break;
case 0x8900: // Shutdown port, could be moved in a PM device
// or a host <-> guest communication device
switch (value) {
case 'S': if (BX_UM_THIS s.shutdown == 0) BX_UM_THIS s.shutdown = 1; break;
case 'h': if (BX_UM_THIS s.shutdown == 1) BX_UM_THIS s.shutdown = 2; break;
case 'u': if (BX_UM_THIS s.shutdown == 2) BX_UM_THIS s.shutdown = 3; break;
case 't': if (BX_UM_THIS s.shutdown == 3) BX_UM_THIS s.shutdown = 4; break;
case 'd': if (BX_UM_THIS s.shutdown == 4) BX_UM_THIS s.shutdown = 5; break;
case 'o': if (BX_UM_THIS s.shutdown == 5) BX_UM_THIS s.shutdown = 6; break;
case 'w': if (BX_UM_THIS s.shutdown == 6) BX_UM_THIS s.shutdown = 7; break;
case 'n': if (BX_UM_THIS s.shutdown == 7) BX_UM_THIS s.shutdown = 8; break;
#if BX_DEBUGGER
// Very handy for debugging:
// output 'D' to port 8900, and bochs quits to debugger
case 'D': bx_debug_break(); break;
#endif
default : BX_UM_THIS s.shutdown = 0; break;
}
if (BX_UM_THIS s.shutdown == 8) {
bx_user_quit = 1;
BX_FATAL(("Shutdown port: shutdown requested"));
}
break;
/*
case 0xfedc:
bx_dbg.io_debugger = (value > 0);
BX_DEBUG(("DEBUGGER = %u", (unsigned) bx_dbg.io_debugger));
break;
*/
default:
break;
}
return_from_write:
switch (io_len) {
case 1:
BX_DEBUG(("unmapped: 8-bit write to %04x = %02x", address, value));
break;
case 2:
BX_DEBUG(("unmapped: 16-bit write to %04x = %04x", address, value));
break;
case 4:
BX_DEBUG(("unmapped: 32-bit write to %04x = %08x", address, value));
break;
default:
BX_PANIC(("unmapped: %d-bit write to %04x = %x", io_len * 8, address, value));
break;
}
}
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