Skip to main content

## _xrstors64

# Function _xrstors64

1.27.0 · Source

    pub unsafe fn _xrstors64(mem_addr: *const u8, rs_mask: u64)

Available on x86-64 and target feature `xsave` and target feature `xsaves` only.
Expand description

Performs a full or partial restore of the enabled processor states using the state information stored in memory at `mem_addr`.

`xrstors` differs from `xrstor` in that it can restore state components corresponding to bits set in the `IA32_XSS` `MSR`; `xrstors` cannot restore from an `xsave` area in which the extended region is in the standard form. State is restored based on bits `[62:0]` in `rs_mask`, `XCR0`, and `mem_addr.HEADER.XSTATE_BV`. `mem_addr` must be aligned on a 64-byte boundary.

Intel’s documentation