Prevent out-of-order data access to FSP mailbox memory area

- Added system call to map FSP mailbox memory with guard permission
- Call new mapping in DMA area init
- Propagate guard permission down to MMIO map
- Apply guard permission in page fault handler
- Updated debug tools to support extra bit in MMIO struct

Change-Id: I8335ac7d3ef57e46d4c8b6c2b2a42b8a0bf7c4b0
Backport: release-fips830
Backport: release-fips820
CQ: SW295345
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/16307
Tested-by: Jenkins Server
Reviewed-by: Brian H. Horton <brianh@linux.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

2 files changed, 12 insertions, 3 deletions

diff --git a/src/lib/syscall_mm.C b/src/lib/syscall_mm.C
index b6b17839a..f6aaa75de 100644
--- a/src/lib/syscall_mm.C
+++ b/src/lib/syscall_mm.C
@@ -137,7 +137,16 @@ void mm_tolerate_ue(uint64_t i_state)
  */
 void* mm_block_map(void* i_paddr, uint64_t i_size)
 {
-    return _syscall3(DEV_MAP, i_paddr, (void*)i_size, (void*)1);
+    return _syscall4(DEV_MAP, i_paddr, (void*)i_size, (void*)1, (void*)0);
+}
+
+/**
+ * System call to map an arbitrary physical address into the VMM with guarded
+ *     permissions to prevent out-of-order access to instructions and data
+ */
+void* mm_guarded_block_map(void* i_paddr, uint64_t i_size)
+{
+    return _syscall4(DEV_MAP, i_paddr, (void*)i_size, (void*)1, (void*)1);
 }
 
 /**
diff --git a/src/lib/syscall_mmio.C b/src/lib/syscall_mmio.C
index 541528e3b..535e22d39 100644
--- a/src/lib/syscall_mmio.C
+++ b/src/lib/syscall_mmio.C
@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2010,2014                        */
+/* Contributors Listed Below - COPYRIGHT 2010,2015                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -33,7 +33,7 @@ using namespace Systemcalls;
 
 void* mmio_dev_map(void *ra, uint64_t i_devDataSize)
 {
-    return _syscall3(DEV_MAP, ra, (void*)i_devDataSize, (void*)0);
+    return _syscall4(DEV_MAP, ra, (void*)i_devDataSize, (void*)0, (void*)1);
 }
 
 int mmio_dev_unmap(void *ea)