Remaps an additional 64-bit address to a 32-bit address that can be used by the kernel.
| addr64 | Specifies the 64-bit effective address of start of range to be remapped. |
| len | Specifies the number of bytes in the range to be remapped. |
| addr32 | Specifies the new 32-bit remapped address (filled in by as_remap64). |
The as_remap64 service will create a 32-bit remapped address from the 64-bit address and return that to the caller. This service may be called when another address needs to be remapped after the remap_64 service has already been called in the context of the same system call.
A common example when this may be needed is in a device driver ioctl entry point. If the arg parameter is a 64-bit pointer to a structure, it is remapped by the __remap library routine and remap_64 kernel service before the device driver ioctl entry point is called. If the structure itself contains 64-bit pointers, however, the as_remap64 routine may be used by the device driver to remap these additional pointers.
The as_remap64 kernel service may be called for either a 32-bit or 64-bit process. If called for a 32-bit process and addr64 is a valid 32-bit address, then this address is simply returned in the addr32 parameter.
The as_remap64 kernel service can be called from the process environment only.
| 0 | Successful completion. | ||
| EINVAL | The process is 32-bit, and addr64 is not a valid 32-bit address (or)
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The as_remap64 kernel service is part of Base Operating System (BOS) Runtime.
The as_remap64 kernel service, as_unremap64 kernel service.
Memory Kernel Services and Understanding Virtual Memory Manager Interfaces in AIX Version 4 Kernel Extensions and Device Support Programming Concepts.