Allocates and maps a specified region in the current user address space.
| vmhandle | Describes the virtual memory object being made addressable in the address space. |
| offset | Specifies the offset in the virtual memory object. The upper 4-bits of this offset are ignored. |
| The as_att64 kernel service: | Selects an unallocated region within the current user address space. |
| Allocates the region. | |
| Maps the virtual memory object selected by the vmhandle parameter with the access permission specified in the handle. | |
| Constructs the address of the offset specified by the offset parameter within the user-address space. |
The as_att64 kernel service assumes an address space model of fixed-size virtual memory objects.
This service will operate correctly for both 32-bit and 64-bit user address spaces. It will also work for kernel processes (kprocs).
Note: This service only operates on the current process's address space. It is not allowed to operate on another address space.
The as_att64 kernel service can be called from the process environment only.
On successful completion, this service returns the base address plus the input offset (offset) into the allocated region.
| NULL | An error occurred and ernno indicates the cause: |
| EINVAL | Address specified is out of range, or |
| ENOMEM | Could not allocate due to insufficient resources. |
The as_att64 kernel service is part of Base Operating System (BOS) Runtime.
The as_seth64 kernel service, as_det64 kernel service, as_geth64 kernel service, as_getsrval64 kernel service, as_puth64 kernel service.