[PATCH v2 10/18] arm64: sysreg: Add FPCR and FPSR

[Mark Brown]

On Thu, May 28, 2026 at 05:54:38PM +0100, Mark Rutland wrote:
> Add sysreg definitions for FPCR and FPSR.
> 
> Some versions of LLVM will refuse to assemble accesses to FPCR and FPSR
> unless the "fp" arch extension is enabled, which we don't currently do
> for read_sysreg() and write_sysreg(). In general, handling feature
> dependencies would complicate read_sysreg() and write_sysreg(), and it's
> simpler to use read_sysreg_s() and write_sysreg_s() instead, requiring
> sysreg definitions.

> The values used can be found in ARM ARM issue M.b:

>   https://developer.arm.com/documentation/ddi0487/mb/

> ... in sections:

> * C5.2.8 ("FPCR, Floating-point Control Register")
> * C5.2.10 ("FPSR, Floating-point Status Register")

Reviewed-by: Mark Brown <broonie at kernel.org>

Cross checked against DDI0601 2026-03.
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