136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2009 The Bochs Project
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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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#include "iodev.h"
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#include "guest2host.h"
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#define LOG_THIS bx_g2h.
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bx_g2h_c bx_g2h;
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bx_g2h_c::bx_g2h_c()
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{
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put("G2H");
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unsigned i;
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for (i=0; i<BX_MAX_G2H_CHANNELS; i++) {
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s.callback[i].f = NULL;
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s.callback[i].used = 0;
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}
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}
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bx_g2h_c::~bx_g2h_c()
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{
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// nothing for now
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}
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void bx_g2h_c::init(void)
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{
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BX_DEBUG(("Init $Id$"));
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// Reserve a dword port for this interface
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for (Bit32u addr=BX_G2H_PORT; addr<=(BX_G2H_PORT+3); addr++) {
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bx_devices.register_io_read_handler(&bx_g2h,
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inp_handler, addr, "g2h");
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bx_devices.register_io_write_handler(&bx_g2h,
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outp_handler, addr, "g2h");
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}
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memset(&bx_g2h.s, 0, sizeof(bx_g2h.s));
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}
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void bx_g2h_c::reset(unsigned type)
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{
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}
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unsigned bx_g2h_c::acquire_channel(bx_g2h_callback_t f)
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{
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unsigned i;
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for (i=0; i<BX_MAX_G2H_CHANNELS; i++) {
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if (bx_g2h.s.callback[i].used==0) {
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bx_g2h.s.callback[i].f = f;
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bx_g2h.s.callback[i].used = 1;
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return(i);
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}
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}
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BX_INFO(("g2h: attempt to acquire channel: maxed out"));
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return BX_G2H_ERROR; // No more free channels
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}
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unsigned bx_g2h_c::deacquire_channel(unsigned channel)
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{
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if ((channel >= BX_MAX_G2H_CHANNELS) ||
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(bx_g2h.s.callback[channel].used==0))
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{
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BX_PANIC(("g2h: attempt to deacquire channel %u: not acquired", channel));
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}
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bx_g2h.s.callback[channel].used = 0;
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bx_g2h.s.callback[channel].f = NULL;
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return 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_g2h_c::inp_handler(void *this_ptr, Bit32u addr, unsigned io_len)
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{
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UNUSED(this_ptr);
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if (addr != BX_G2H_PORT)
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BX_PANIC(("g2h: IO read not aligned on dword boundary."));
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if (io_len != 4)
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BX_PANIC(("g2h: IO read not dword."));
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BX_PANIC(("g2h: IO read not complete."));
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return(0);
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}
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void bx_g2h_c::outp_handler(void *this_ptr, Bit32u addr, Bit32u val32, unsigned io_len)
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{
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UNUSED(this_ptr);
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if (addr != BX_G2H_PORT)
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BX_PANIC(("g2h: IO write not aligned on dword boundary."));
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if (io_len != 4)
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BX_PANIC(("g2h: IO write not dword."));
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if ((bx_g2h.s.packet_count==0) && (val32!=BX_G2H_MAGIC)) {
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BX_INFO(("g2h: IO W: Not magic header."));
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return;
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}
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bx_g2h.s.guest_packet[bx_g2h.s.packet_count++] = val32;
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if (bx_g2h.s.packet_count >= BX_G2H_PACKET_SIZE) {
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unsigned channel;
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// Full packet received from guest. Pass on to the host code.
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channel = bx_g2h.s.guest_packet[1];
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if (channel >= BX_MAX_G2H_CHANNELS) {
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BX_PANIC(("g2h: channel (%u) out of bounds", channel));
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}
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if (bx_g2h.s.callback[channel].used==0) {
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BX_PANIC(("g2h: channel (%u) not active", channel));
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}
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bx_g2h.s.callback[channel].f(&bx_g2h.s.guest_packet);
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bx_g2h.s.packet_count = 0; // Ready for next packet
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}
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}
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