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Fiasco.OC: fix io-port fault answer in sigma0

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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'
This commit is contained in:
Sebastian Sumpf
2013-01-11 17:36:55 +01:00
parent 127e1f9219
commit ff7ce2a41a
1 changed files with 3 additions and 2 deletions
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5
l4/pkg/sigma0/server/src/ioports_x86.cc
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@@ -39,8 +39,9 @@ void handle_io_page_fault(l4_umword_t t, l4_utcb_t *utcb, Answer *a)
size = l4_fpage_size(fp) + PORT_SHIFT; size = l4_fpage_size(fp) + PORT_SHIFT;
unsigned long i = io_ports.alloc(Region::bs(port, 1UL << size, t)); unsigned long i = io_ports.alloc(Region::bs(port, 1UL << size, t));
if (i == port) if (i == port) {
a->snd_fpage(l4_iofpage(port >> PORT_SHIFT, size - PORT_SHIFT)); a->snd_fpage(l4_iofpage(port >> PORT_SHIFT, size - PORT_SHIFT));
else a->tag = l4_msgtag(0, 0, 1, 0);
} else
a->error(L4_ENOMEM); a->error(L4_ENOMEM);
} }