mirror of https://github.com/bochs-emu/Bochs
276 lines
7.1 KiB
C++
276 lines
7.1 KiB
C++
// Copyright (C) 2000 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include "bochs.h"
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#if BX_USE_UM_SMF
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bx_unmapped_c bx_unmapped;
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#define this (&bx_unmapped)
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#endif
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bx_unmapped_c::bx_unmapped_c(void)
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{
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s.port80 = 0x00;
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s.port8e = 0x00;
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s.bios_message_i = 0;
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}
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bx_unmapped_c::~bx_unmapped_c(void)
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{
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// nothing for now
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}
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void
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bx_unmapped_c::init(bx_devices_c *d)
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{
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BX_UM_THIS devices = d;
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for (Bit32u addr=0; addr<0x10000; addr++) {
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BX_UM_THIS devices->register_io_read_handler(this, read_handler,
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addr, "Unmapped");
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BX_UM_THIS devices->register_io_write_handler(this, write_handler,
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addr, "Unmapped");
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}
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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
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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
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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_printf("unsupported IO read from port %04x (CGA)\n", 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_printf("unsupported IO read from port %04x\n", 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_printf("unmapped: 8-bit read from %04x = %02x\n", 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_printf("unmapped: 16-bit read from %04x = %04x\n", address, retval);
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break;
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case 4:
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bx_printf("unmapped: 32-bit read from %04x = %08x\n", address, retval);
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break;
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default:
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bx_printf("unmapped: ??-bit read from %04x = %x\n", address, retval);
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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
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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
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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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// ???
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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_printf("Diagnostic port 80h: write = %02xh\n", (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_printf("unsupported IO write to port %04x of %02x\n",
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// address, value);
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break;
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case 0xfedc:
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bx_dbg.debugger = (value > 0);
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fprintf(stderr, "# DEBUGGER = %u\n", (unsigned) bx_dbg.debugger);
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break;
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case 0xfff0:
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BX_UM_THIS s.bios_message[BX_UM_THIS s.bios_message_i] =
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(Bit8u) value;
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BX_UM_THIS s.bios_message_i ++;
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if ( BX_UM_THIS s.bios_message_i >= BX_BIOS_MESSAGE_SIZE ) {
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BX_UM_THIS s.bios_message[ BX_BIOS_MESSAGE_SIZE - 1] = 0;
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BX_UM_THIS s.bios_message_i = 0;
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bx_printf("BIOS message: %s\n", BX_UM_THIS s.bios_message);
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}
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else if ((value & 0xff) == '\n') {
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BX_UM_THIS s.bios_message[ BX_UM_THIS s.bios_message_i ] = 0;
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BX_UM_THIS s.bios_message_i = 0;
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bx_printf("BIOS message: %s\n", BX_UM_THIS s.bios_message);
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}
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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_printf("unmapped: 8-bit write to %04x = %02x\n", address, value);
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break;
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case 2:
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bx_printf("unmapped: 16-bit write to %04x = %04x\n", address, value);
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break;
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case 4:
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bx_printf("unmapped: 32-bit write to %04x = %08x\n", address, value);
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break;
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default:
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bx_printf("unmapped: ??-bit write to %04x = %x\n", address, value);
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break;
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}
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}
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