PSDHLP_VMALLOC

typedef struct vmalloc_s {
   ulong_t addr;    (Input/Output)
   ulong_t cbsize;  (Input)
   ulong_t flags;   (Input)
} VMALLOC;

• addr is filled with the linear address of the allocated or mapped memory on return from the help.
  If VMALLOC_LOCSPECIFIC is specified, this field must contain the virtual address to map before calling the help.
  If VMALLOC_PHYS is specified, this field must contain the physical address to map before calling the help.
  
• cbsize is the size of the allocation, or mapping in bytes.
• flags indicate which type of operation is to be performed.
  VMALLOC_FIXED indicates that the allocated memory is to be fixed in memory (not-swappable or movable). If this flag is omitted, the allocated memory will be swappable by default.
  VMALLOC_CONTIG indicates that the allocation must use contigous physical memory. If this flag is specified VMALLOC_FIXED must also be used.
  VMALLOC_LOCSPECIFIC indicates a request for a memory allocation at a specific virtual address. If this flag is specified, the addr field must contain the virtual address to map.
  Note: This flag can be used with the VMALLOC_PHYS flag to allocate memory where linear = physical.
  VMALLOC_PHYS indicates a request for a virtual mapping of physical memory. If this flag is specified, the addr field must contain the physical address to map.
  Note: This flag can be used with the VMALLOC_LOCSPECIFIC flag to allocate memory where linear = physical.
  VMALLOC_1M indicates a request for a memory allocation below the 1MB boundary.