On Tue, Jul 6, 2021 at 1:23 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Tue, Jul 06, 2021 at 12:18:05PM +0800, Huacai Chen wrote:
> > +
> > +static inline u32 csr_xchgl(u32 val, u32 mask, u32 reg)
> > +{
> > + return __csrxchg(val, mask, reg);
> > +}
> > +
> > +static inline u64 csr_xchgq(u64 val, u64 mask, u32 reg)
> > +{
> > + return __dcsrxchg(val, mask, reg);
> > +}
>
> What are these __csrfoo() things, I cannot seem to find a definition of
> them anywhere..
It seems that those are provided as compiler intrinsics in <larchintrin.h>,
based on an architecture specific __builtin_loongarch_csrxchg() etc.
The specific registers are documented at
https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN#control-and-status-registers
Arnd
