feat(baremetal NIC): initial push for baremetal NIC

Only works on Intel 82599 family based NICs

Author: handong32

src/IOBuf.h

@@ -7,10 +7,10 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cstring>
 #include <forward_list>
 #include <memory>
 #include <vector>
-#include <cstring>
 
 #include <boost/iterator/iterator_facade.hpp>
 
@@ -64,6 +64,7 @@ class IOBuf {
   }
 
   void TrimEnd(size_t amount) { length_ -= amount; }
+  void SetLength(size_t amount) { length_ = amount; }
 
   bool IsChained() const { return Next() != this; }
 

src/native/GeneralPurposeAllocator.h

@@ -16,6 +16,26 @@
 
 namespace ebbrt {
 
+// handler used in Pci.cc code to handle faults on multicores when mapping
+// device
+class MulticorePciFaultHandler : public ebbrt::VMemAllocator::PageFaultHandler {
+  ebbrt::Pfn vpage_;
+  ebbrt::Pfn ppage_;
+  size_t size_;
+
+ public:
+  void SetMap(ebbrt::Pfn va, ebbrt::Pfn pa, size_t s) {
+    vpage_ = va;
+    ppage_ = pa;
+    size_ = s;
+  }
+
+  void HandleFault(ebbrt::idt::ExceptionFrame* ef,
+                   uintptr_t faulted_address) override {
+    ebbrt::vmem::MapMemory(vpage_, ppage_, size_);
+  }
+};
+
 // page fault handler for mapping in physical pages
 // to virtual pages on all cores
 class LargeRegionFaultHandler : public ebbrt::VMemAllocator::PageFaultHandler {