feat: make kernel architecture-agnostic; primitive work on arm port

kernel/src/Drivers/Storage/Nvme.cpp

@@ -5,6 +5,7 @@
 */
 
 #include "Nvme.hpp"
+#include <Arch/Cpu.hpp>
 #include "BlockDevice.hpp"
 #include <Pci/Pci.hpp>
 #include <Terminal/Terminal.hpp>
@@ -13,7 +14,7 @@
 #include <Memory/Paging.hpp>
 #include <Memory/PageFrameAllocator.hpp>
 #include <Libraries/Memory.hpp>
-#include <Timekeeping/ApicTimer.hpp>
+#include <Timekeeping/Timer.hpp>
 
 using namespace Kt;
 
@@ -191,7 +192,7 @@ namespace Drivers::Storage::Nvme {
             if ((spins & 0x3FFF) == 0 &&
                 Timekeeping::GetMilliseconds() - start >= kTimeoutMs) break;
             if (spins >= kMaxSpins) break;
-            asm volatile("pause" ::: "memory");
+            Arch::Pause();
         }
 
         KernelLogStream(ERROR, "NVMe") << "Command " << base::dec << (uint64_t)cmdId
@@ -254,7 +255,7 @@ namespace Drivers::Storage::Nvme {
             if (!(csts & CSTS_RDY)) {
                 return true;
             }
-            asm volatile("" ::: "memory");
+            Arch::CompilerBarrier();
         }
 
         KernelLogStream(ERROR, "NVMe") << "Controller disable timeout";
@@ -280,7 +281,7 @@ namespace Drivers::Storage::Nvme {
             if (csts & CSTS_RDY) {
                 return true;
             }
-            asm volatile("" ::: "memory");
+            Arch::CompilerBarrier();
         }
 
         KernelLogStream(ERROR, "NVMe") << "Controller enable timeout";