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

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.

base-foc/config/x86_64.kernel

@@ -1,70 +0,0 @@
-#
-# Automatically generated file; DO NOT EDIT.
-# Fiasco configuration
-#
-
-#
-# Target configuration
-#
-# CONFIG_IA32 is not set
-CONFIG_AMD64=y
-# CONFIG_ARM is not set
-CONFIG_PF_PC=y
-CONFIG_ABI_VF=y
-CONFIG_AMD64_K8=y
-# CONFIG_AMD64_CORE2 is not set
-# CONFIG_AMD64_ATOM is not set
-# CONFIG_AMD64_K10 is not set
-# CONFIG_CPU_VIRT is not set
-# CONFIG_SCHED_PIT is not set
-# CONFIG_SCHED_RTC is not set
-CONFIG_SCHED_APIC=y
-# CONFIG_WORKAROUND_AMD_FPU_LEAK is not set
-
-#
-# Kernel options
-#
-# CONFIG_MP is not set
-CONFIG_CONTEXT_4K=y
-# CONFIG_IO_PROT is not set
-# CONFIG_FINE_GRAINED_CPUTIME is not set
-CONFIG_SCHED_FIXED_PRIO=y
-
-#
-# Debugging
-#
-CONFIG_INLINE=y
-# CONFIG_NDEBUG is not set
-CONFIG_NO_FRAME_PTR=y
-CONFIG_STACK_DEPTH=y
-# CONFIG_LIST_ALLOC_SANITY is not set
-# CONFIG_BEFORE_IRET_SANITY is not set
-# CONFIG_IRQ_SPINNER is not set
-CONFIG_WATCHDOG=y
-CONFIG_SERIAL=y
-CONFIG_JDB=y
-CONFIG_JDB_LOGGING=y
-CONFIG_JDB_DISASM=y
-CONFIG_JDB_GZIP=y
-CONFIG_JDB_MISC=y
-CONFIG_POWERSAVE_GETCHAR=y
-# CONFIG_WARN_NONE is not set
-CONFIG_WARN_WARNING=y
-# CONFIG_WARN_ANY is not set
-
-#
-# Compiling
-#
-CONFIG_CC="gcc"
-CONFIG_CXX="g++"
-CONFIG_HOST_CC="gcc"
-CONFIG_HOST_CXX="g++"
-# CONFIG_MAINTAINER_MODE is not set
-CONFIG_LABEL=""
-# CONFIG_EXPERIMENTAL is not set
-CONFIG_PERF_CNT=y
-CONFIG_BIT64=y
-CONFIG_WARN_LEVEL=1
-CONFIG_XARCH="amd64"
-CONFIG_IA32_TARGET="AMD Opteron"
-CONFIG_ABI="vf"

base-foc/patches/sigma0_ioport.patch

@@ -0,0 +1,16 @@
+Index: l4/pkg/sigma0/server/src/ioports_x86.cc
+===================================================================
+--- l4/pkg/sigma0/server/src/ioports_x86.cc	(revision 40)
++++ l4/pkg/sigma0/server/src/ioports_x86.cc	(working copy)
+@@ -39,8 +39,9 @@
+   size = l4_fpage_size(fp) + PORT_SHIFT;
+ 
+   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));
+-  else
++    a->tag = l4_msgtag(0, 0, 1, 0);
++  } else
+     a->error(L4_ENOMEM);
+ }

base-foc/src/kernel/x86_64/target.mk

@@ -1,4 +1,5 @@
 REQUIRES      = x86 64bit
-KERNEL_CONFIG = $(REP_DIR)/config/x86_64.kernel
+FIASCO_DIR    = $(REP_DIR)/contrib/kernel/fiasco
+KERNEL_CONFIG = $(FIASCO_DIR)/src/templates/globalconfig.out.amd64-mp
 
 -include $(PRG_DIR)/../target.inc