ff7ce2a41a
In sigma0 normally no answer tag to a request/fault is created. It simply uses the message tag received with the request. This doesn't work out when I/O ports are requested. This patch constructs an appropriate answer tag. Moreover, we have to enable I/O port protection in the kernel configuration. Was: 'sigma0_ioport.patch'
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
/*
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* (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
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* Alexander Warg <warg@os.inf.tu-dresden.de>
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* economic rights: Technische Universität Dresden (Germany)
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*
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* This file is part of TUD:OS and distributed under the terms of the
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* GNU General Public License 2.
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* Please see the COPYING-GPL-2 file for details.
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*/
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#include "ioports.h"
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#include "mem_man.h"
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#include "globals.h"
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#include <l4/sys/types.h>
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#include <l4/sys/ipc.h>
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#include <l4/cxx/iostream>
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enum { PORT_SHIFT = 12 };
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static Mem_man io_ports;
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void init_io_ports(l4_kernel_info_t * /*info*/)
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{
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io_ports.add_free(Region::kr(0, (64*1024) << PORT_SHIFT));
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}
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void dump_io_ports()
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{
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L4::cout << "IO PORTS--------------------------\n";
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io_ports.dump();
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}
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void handle_io_page_fault(l4_umword_t t, l4_utcb_t *utcb, Answer *a)
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{
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unsigned long port, size;
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l4_fpage_t fp = (l4_fpage_t&)l4_utcb_mr_u(utcb)->mr[0];
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port = l4_fpage_page(fp) << PORT_SHIFT;
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size = l4_fpage_size(fp) + PORT_SHIFT;
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unsigned long i = io_ports.alloc(Region::bs(port, 1UL << size, t));
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if (i == port) {
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a->snd_fpage(l4_iofpage(port >> PORT_SHIFT, size - PORT_SHIFT));
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a->tag = l4_msgtag(0, 0, 1, 0);
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} else
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a->error(L4_ENOMEM);
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}
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