Initial XTOS boot protocol support

sdk/xtdk/xttarget.h

@@ -21,11 +21,13 @@
     #define _ARCH_I686                 1
     #define _XT32                      1
     #define EFI_ERROR_MASK             0x80000000
+    #define XTOS_KERNEL_ADDRESS        0x81800000
 #elif defined(__amd64__) || defined(__x86_64__)
     #define _ARCH                      amd64
     #define _ARCH_AMD64                1
     #define _XT64                      1
     #define EFI_ERROR_MASK             0x8000000000000000
+    #define XTOS_KERNEL_ADDRESS        0xFFFFF80800000000
 #else
     #error Unknown architecture
 #endif