[denali] Add a stub client for denali

lib/mammoth/include/mammoth/memory_region.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <ztypes.h>
 
 class MappedMemoryRegion {
  public:
@@ -8,6 +9,7 @@ class MappedMemoryRegion {
   static MappedMemoryRegion DirectPhysical(uint64_t phys_addr, uint64_t size);
   static MappedMemoryRegion ContiguousPhysical(uint64_t size);
   static MappedMemoryRegion Default(uint64_t size);
+  static MappedMemoryRegion FromCapability(z_cap_t vmmo_cap);
 
   MappedMemoryRegion() {}
   // TODO: Disallow copy before doing any cleanup here.

lib/mammoth/src/memory_region.cpp

@@ -35,3 +35,11 @@ MappedMemoryRegion MappedMemoryRegion::Default(uint64_t size) {
 
   return MappedMemoryRegion(vmmo_cap, 0, vaddr, size);
 }
+
+MappedMemoryRegion MappedMemoryRegion::FromCapability(z_cap_t vmmo_cap) {
+  uint64_t vaddr;
+  check(ZAddressSpaceMap(gSelfVmasCap, 0, vmmo_cap, &vaddr));
+
+  // FIXME: get the size here.
+  return MappedMemoryRegion(vmmo_cap, 0, vaddr, 0);
+}

sys/denali/CMakeLists.txt

@@ -9,7 +9,7 @@ add_executable(denali
 
 target_include_directories(denali
    PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
-   PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
+   "${CMAKE_CURRENT_SOURCE_DIR}/include")
 
 target_link_libraries(denali
   cxx
@@ -20,3 +20,19 @@ set_target_properties(denali PROPERTIES
   COMPILE_FLAGS "${CMAKE_CXX_FLAGS} ${BASE_COMPILE_FLAGS}"
   LINK_FLAGS "${CMAKE_EXE_LINK_FLAGS} ${BASE_LINK_FLAGS}"
   )
+
+add_library(libdenali
+  client/denali_client.cpp
+  )
+
+target_include_directories(libdenali
+   PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+   PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")
+
+ target_link_libraries(libdenali
+   mammoth_lib)
+
+set_target_properties(libdenali PROPERTIES
+  COMPILE_FLAGS "${CMAKE_CXX_FLAGS} ${BASE_COMPILE_FLAGS}"
+  LINK_FLAGS "${CMAKE_EXE_LINK_FLAGS} ${BASE_LINK_FLAGS}"
+  )

sys/denali/client/denali_client.cpp

@@ -0,0 +1,21 @@
+#include "denali/denali_client.h"
+
+#include <mammoth/debug.h>
+
+#include "denali/denali.h"
+
+MappedMemoryRegion DenaliClient::ReadSectors(uint64_t device_id, uint64_t lba,
+                                             uint64_t num_sectors) {
+  DenaliRead read{
+      .device_id = device_id,
+      .lba = lba,
+      .size = num_sectors,
+  };
+  check(channel_.WriteStruct(&read));
+
+  DenaliReadResponse resp;
+  uint64_t mem_cap;
+  check(channel_.ReadStructAndCap(&resp, &mem_cap));
+
+  return MappedMemoryRegion::FromCapability(mem_cap);
+}

sys/denali/include/denali/denali_client.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <mammoth/channel.h>
+#include <mammoth/memory_region.h>
+
+class DenaliClient {
+ public:
+  DenaliClient(const Channel& channel) : channel_(channel) {}
+
+  MappedMemoryRegion ReadSectors(uint64_t device_id, uint64_t lba,
+                                 uint64_t num_sectors);
+
+ private:
+  Channel channel_;
+};