291 lines
8.4 KiB
C++
291 lines
8.4 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: unmapped.cc,v 1.32 2009-02-08 09:05:52 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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/////////////////////////////////////////////////////////////////////////
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// Define BX_PLUGGABLE in files that can be compiled into plugins. For
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// platforms that require a special tag on exported symbols, BX_PLUGGABLE
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// is used to know when we are exporting symbols and when we are importing.
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#define BX_PLUGGABLE
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#include "iodev.h"
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#include "unmapped.h"
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#define LOG_THIS theUnmappedDevice->
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bx_unmapped_c *theUnmappedDevice = NULL;
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int libunmapped_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
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{
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theUnmappedDevice = new bx_unmapped_c();
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BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theUnmappedDevice, BX_PLUGIN_UNMAPPED);
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return(0); // Success
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}
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void libunmapped_LTX_plugin_fini(void)
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{
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delete theUnmappedDevice;
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}
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bx_unmapped_c::bx_unmapped_c(void)
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{
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put("UNMP");
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}
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bx_unmapped_c::~bx_unmapped_c(void)
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{
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BX_DEBUG(("Exit"));
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}
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void bx_unmapped_c::init(void)
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{
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DEV_register_default_ioread_handler(this, read_handler, "Unmapped", 7);
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DEV_register_default_iowrite_handler(this, write_handler, "Unmapped", 7);
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s.port80 = 0x00;
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s.port8e = 0x00;
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s.shutdown = 0;
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}
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// static IO port read callback handler
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// redirects to non-static class handler to avoid virtual functions
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Bit32u bx_unmapped_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
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{
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#if !BX_USE_UM_SMF
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bx_unmapped_c *class_ptr = (bx_unmapped_c *) this_ptr;
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return class_ptr->read(address, io_len);
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}
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Bit32u bx_unmapped_c::read(Bit32u address, unsigned io_len)
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{
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#else
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UNUSED(this_ptr);
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#endif // !BX_USE_UM_SMF
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UNUSED(io_len);
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Bit32u retval;
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// This function gets called for access to any IO ports which
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// are not mapped to any device handler. Reads return 0
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if (address >= 0x02e0 && address <= 0x02ef) {
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retval = 0;
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goto return_from_read;
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}
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switch (address) {
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case 0x80:
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retval = BX_UM_THIS s.port80;
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break;
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case 0x8e:
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retval = BX_UM_THIS s.port8e;
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break;
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#if BX_PORT_E9_HACK
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// Unused port on ISA - this can be used by the emulated code
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// to detect it is running inside Bochs and that the debugging
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// features are available (write 0xFF or something on unused
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// port 0x80, then read from 0xe9, if value is 0xe9, debug
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// output is available) (see write() for that) -- Andreas and Emmanuel
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case 0xe9:
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retval = 0xe9;
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break;
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#endif
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case 0x03df:
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retval = 0xffffffff;
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BX_DEBUG(("unsupported IO read from port %04x (CGA)", address));
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break;
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case 0x023a:
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case 0x02f8: /* UART */
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case 0x02f9: /* UART */
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case 0x02fb: /* UART */
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case 0x02fc: /* UART */
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case 0x02fd: /* UART */
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case 0x02ea:
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case 0x02eb:
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case 0x03e8:
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case 0x03e9:
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case 0x03ea:
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case 0x03eb:
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case 0x03ec:
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case 0x03ed:
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case 0x03f8: /* UART */
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case 0x03f9: /* UART */
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case 0x03fb: /* UART */
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case 0x03fc: /* UART */
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case 0x03fd: /* UART */
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case 0x17c6:
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retval = 0xffffffff;
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BX_DEBUG(("unsupported IO read from port %04x", address));
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break;
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default:
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retval = 0xffffffff;
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}
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return_from_read:
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if (bx_dbg.unsupported_io) {
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switch (io_len) {
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case 1:
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retval = (Bit8u)retval;
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BX_DEBUG(("unmapped: 8-bit read from %04x = %02x", address, retval));
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break;
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case 2:
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retval = (Bit16u)retval;
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BX_DEBUG(("unmapped: 16-bit read from %04x = %04x", address, retval));
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break;
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case 4:
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BX_DEBUG(("unmapped: 32-bit read from %04x = %08x", address, retval));
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break;
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default:
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BX_DEBUG(("unmapped: %d-bit read from %04x = %x", io_len * 8, address, retval));
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}
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}
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return retval;
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}
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// static IO port write callback handler
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// redirects to non-static class handler to avoid virtual functions
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void bx_unmapped_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
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{
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#if !BX_USE_UM_SMF
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bx_unmapped_c *class_ptr = (bx_unmapped_c *) this_ptr;
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class_ptr->write(address, value, io_len);
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}
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void bx_unmapped_c::write(Bit32u address, Bit32u value, unsigned io_len)
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{
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#else
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UNUSED(this_ptr);
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#endif // !BX_USE_UM_SMF
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UNUSED(io_len);
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// This function gets called for access to any IO ports which
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// are not mapped to any device handler. Writes to an unmapped
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// IO port are ignored.
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if (address >= 0x02e0 && address <= 0x02ef)
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goto return_from_write;
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switch (address) {
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case 0x80: // diagnostic test port to display progress of POST
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//BX_DEBUG(("Diagnostic port 80h: write = %02xh", (unsigned) value));
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BX_UM_THIS s.port80 = value;
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break;
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case 0x8e: // ???
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BX_UM_THIS s.port8e = value;
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break;
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#if BX_PORT_E9_HACK
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// This port doesn't exist on normal ISA architecture. However,
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// we define a convention here, to display on the console of the
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// system running Bochs, anything that is written to it. The
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// idea is to provide debug output very early when writing
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// BIOS or OS code for example, without having to bother with
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// properly setting up a serial port or anything.
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//
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// Idea by Andreas Beck (andreas.beck@ggi-project.org)
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case 0xe9:
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putchar(value);
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fflush(stdout);
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break;
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#endif
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case 0xed: // Dummy port used as I/O delay
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break;
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case 0xee: // ???
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break;
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case 0x2f2:
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case 0x2f3:
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case 0x2f4:
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case 0x2f5:
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case 0x2f6:
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case 0x2f7:
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case 0x3e8:
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case 0x3e9:
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case 0x3eb:
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case 0x3ec:
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case 0x3ed:
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// BX_DEBUG(("unsupported IO write to port %04x of %02x", address, value));
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break;
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case 0x8900: // Shutdown port, could be moved in a PM device
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// or a host <-> guest communication device
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switch (value) {
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case 'S': if (BX_UM_THIS s.shutdown == 0) BX_UM_THIS s.shutdown = 1; break;
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case 'h': if (BX_UM_THIS s.shutdown == 1) BX_UM_THIS s.shutdown = 2; break;
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case 'u': if (BX_UM_THIS s.shutdown == 2) BX_UM_THIS s.shutdown = 3; break;
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case 't': if (BX_UM_THIS s.shutdown == 3) BX_UM_THIS s.shutdown = 4; break;
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case 'd': if (BX_UM_THIS s.shutdown == 4) BX_UM_THIS s.shutdown = 5; break;
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case 'o': if (BX_UM_THIS s.shutdown == 5) BX_UM_THIS s.shutdown = 6; break;
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case 'w': if (BX_UM_THIS s.shutdown == 6) BX_UM_THIS s.shutdown = 7; break;
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case 'n': if (BX_UM_THIS s.shutdown == 7) BX_UM_THIS s.shutdown = 8; break;
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#if BX_DEBUGGER
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// Very handy for debugging:
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// output 'D' to port 8900, and bochs quits to debugger
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case 'D': bx_debug_break(); break;
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#endif
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default : BX_UM_THIS s.shutdown = 0; break;
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}
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if (BX_UM_THIS s.shutdown == 8) {
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bx_user_quit = 1;
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LOG_THIS setonoff(LOGLEV_PANIC, ACT_FATAL);
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BX_PANIC(("Shutdown port: shutdown requested"));
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}
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break;
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case 0xfedc:
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bx_dbg.debugger = (value > 0);
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BX_DEBUG(("DEBUGGER = %u", (unsigned) bx_dbg.debugger));
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break;
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default:
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break;
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}
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return_from_write:
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if (bx_dbg.unsupported_io) {
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switch (io_len) {
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case 1:
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BX_INFO(("unmapped: 8-bit write to %04x = %02x", address, value));
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break;
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case 2:
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BX_INFO(("unmapped: 16-bit write to %04x = %04x", address, value));
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break;
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case 4:
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BX_INFO(("unmapped: 32-bit write to %04x = %08x", address, value));
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break;
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default:
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BX_INFO(("unmapped: %d-bit write to %04x = %x", io_len * 8, address, value));
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break;
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}
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}
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}
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