[Yellowstone] Attempt to read a test file from the system root.

sys/yellowstone/CMakeLists.txt

@@ -12,6 +12,7 @@ target_link_libraries(yellowstone
   denali_yunq
   mammoth
   glacier
+  victoriafalls_yunq
   yellowstone_yunq
   )
 

sys/yellowstone/yellowstone.cpp

@@ -1,6 +1,7 @@
 #include <mammoth/debug.h>
 #include <mammoth/endpoint_client.h>
 #include <mammoth/init.h>
+#include <mammoth/memory_region.h>
 #include <mammoth/process.h>
 #include <zcall.h>
 
@@ -33,6 +34,17 @@ uint64_t main(uint64_t port_cap) {
 
   dbgln("VFS Available.");
 
+  auto vfs_client = server->GetVFSClient();
+  OpenFileRequest request;
+  request.set_path("/init.txt");
+  OpenFileResponse response;
+  check(vfs_client->OpenFile(request, response));
+
+  MappedMemoryRegion file =
+      MappedMemoryRegion::FromCapability(response.memory());
+
+  dbgln("addr: %lu, size: %lu", file.vaddr(), file.size());
+
   check(server_thread.Join());
   dbgln("Yellowstone Finished Successfully.");
   return 0;

sys/yellowstone/yellowstone_server.cpp

@@ -85,6 +85,9 @@ glcr::ErrorCode YellowstoneServer::HandleRegisterEndpoint(
     check(has_denali_mutex_.Release());
   } else if (req.endpoint_name() == "victoriafalls") {
     victoria_falls_cap_ = req.endpoint_capability();
+    // FIXME: Probably make a separate copy for use within yellowstone vs
+    // transmit to other processes.
+    vfs_client_ = glcr::MakeShared<VFSClient>(victoria_falls_cap_);
     check(has_victoriafalls_mutex_.Release());
   } else {
     dbgln("[WARN] Got endpoint cap type: %s", req.endpoint_name().cstr());
@@ -101,3 +104,7 @@ glcr::ErrorCode YellowstoneServer::WaitVictoriaFallsRegistered() {
   RET_ERR(has_victoriafalls_mutex_.Lock());
   return has_victoriafalls_mutex_.Release();
 }
+
+glcr::SharedPtr<VFSClient> YellowstoneServer::GetVFSClient() {
+  return vfs_client_;
+}

sys/yellowstone/yellowstone_server.h

@@ -1,11 +1,13 @@
 #pragma once
 
+#include <glacier/memory/shared_ptr.h>
 #include <glacier/memory/unique_ptr.h>
 #include <glacier/status/error_or.h>
 #include <mammoth/endpoint_server.h>
 #include <mammoth/mutex.h>
 #include <mammoth/port_server.h>
 #include <mammoth/thread.h>
+#include <victoriafalls/victoriafalls.yunq.client.h>
 
 #include "hw/pcie.h"
 #include "lib/yellowstone/yellowstone.yunq.server.h"
@@ -22,12 +24,15 @@ class YellowstoneServer : public YellowstoneServerBase {
   glcr::ErrorCode WaitDenaliRegistered();
   glcr::ErrorCode WaitVictoriaFallsRegistered();
 
+  glcr::SharedPtr<VFSClient> GetVFSClient();
+
  private:
   // TODO: Store these in a data structure.
   z_cap_t denali_cap_ = 0;
   uint64_t device_id_ = 0;
   uint64_t lba_offset_ = 0;
   z_cap_t victoria_falls_cap_ = 0;
+  glcr::SharedPtr<VFSClient> vfs_client_;
 
   PciReader pci_reader_;