rem: void *map_base = ACPI_PTR_ADD(void,where,0 - page_offset);
add: void *map_base = ACPI_PTR_ADD(void,where,0L - page_offset);
context: AcpiOsMapMemory (    ACPI_PHYSICAL_ADDRESS   where,    ACPI_SIZE               length,    void                    **there){#ifdef _KERNEL_MODE	int page_offset = ACPI_TO_INTEGER(where) % B_PAGE_SIZE;	void *map_base = ACPI_PTR_ADD(void,where,0 - page_offset);	area_id area;	    area = map_physical_memory("acpi_physical_mem_area", map_base, ROUNDUP(length + page_offset,B_PAGE_SIZE),B_ANY_KERNEL_BLOCK_ADDRESS,0,there);		*there += page_offset;#endif    return (area > 0 ? AE_OK : AE_BAD_ADDRESS);}