PVOID XMemVirtualAlloc(  
         PVOID BaseAddress,  
         SIZE_T Size,  
         DWORD AllocationType,  
         ULONGLONG XMemFlags,  
         DWORD PageProtection  
)  

PVOID mem = XMemVirtualAlloc(NULL, size, MEM_64K_PAGES | MEM_COMMIT, XMemMakeTag('Fred') | XMEM_CPU, PAGE_READWRITE);

// Allocate standard CPU only memory, using default (4K) pages
PVOID cpuMemory = XMemVirtualAlloc (NULL,
                                    1024 * 1024,
                                    MEM_RESERVE | MEM_COMMIT,
                                    XMEM_CPU,
                                    PAGE_READWRITE);

// Allocate 1MB of tooling memory using 64K pages
PVOID cpu64kmemory = XMemVirtualAlloc (NULL,
                                       1024 * 1024,
                                       MEM_64K_PAGES | MEM_RESERVE | MEM_COMMIT,
                                       XMEM_TOOL | XMEM_CPU,
                                       PAGE_READWRITE);

// Allocate 2MB graphics memory
PVOID gfx64kmemory = XMemVirtualAlloc (NULL,
                                       2 * 1024 * 1024,
                                       MEM_2MB_PAGES | MEM_RESERVE | MEM_COMMIT,
                                       XMEM_GRAPHICS,
                                       PAGE_READWRITE | PAGE_GRAPHICS_READONLY);

// Allocate 1MB of graphics memory using 64K pages in 32b address space
PVOID gfxmemory32b = XMemVirtualAlloc (NULL,
                                       1024 * 1024,
                                       MEM_64K_PAGES | MEM_RESERVE | MEM_COMMIT,
                                       XMEM_GRAPHICS_32BIT_ADDRESS,
                                       PAGE_READONLY | PAGE_GRAPHICS_READWRITE);

// Reserve 1GB of CPU visible VA space using 64K pages
PVOID cpuReserve = XMemVirtualAlloc (NULL,
                                     1024 * 1024 * 1024,
                                     MEM_64K_PAGES | MEM_RESERVE,
                                     XMEM_CPU,
                                     PAGE_READWRITE);

// Now commit the first 2MB of the reservation
PVOID cpuCommit = XMemVirtualAlloc (cpuReserve,
                                    2 * 1024 * 1024,
                                    MEM_COMMIT,
                                    XMEM_CPU,
                                    PAGE_READWRITE);

// Reserve 4MB of visible VA space intended for direct physical page mapping
// Note that physical pages are always 64KB and this reservation assumes
// any allocations will be in 32 or 64 page (2MB\4MB) blocks
PVOID physicalReserve = XMemVirtualAlloc (NULL,
                                          4 * 1024 * 1024,
                                          MEM_2MB_PAGES | MEM_RESERVE,
                                          XMEM_GRAPHICS | XMEM_MAPPABLE,
                                          PAGE_READONLY | PAGE_GRAPHICS_COHERENT | PAGE_GRAPHICS_READWRITE);