On Tue, Sep 09, 2025 at 05:56:09PM +0800, Chunyan Zhang wrote: > The Svrsw60t59b extension allows to free the PTE reserved bits 60 > and 59 for software to use. > > Reviewed-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx> > Signed-off-by: Chunyan Zhang <zhangchunyan@xxxxxxxxxxx> > --- > arch/riscv/Kconfig | 14 ++++++++++++++ > arch/riscv/include/asm/hwcap.h | 1 + > arch/riscv/kernel/cpufeature.c | 1 + > 3 files changed, 16 insertions(+) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index a4b233a0659e..d99df67cc7a4 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -862,6 +862,20 @@ config RISCV_ISA_ZICBOP > > If you don't know what to do here, say Y. > > +config RISCV_ISA_SVRSW60T59B > + bool "Svrsw60t59b extension support for using PTE bits 60 and 59" > + depends on MMU && 64BIT > + depends on RISCV_ALTERNATIVE > + default y > + help > + Adds support to dynamically detect the presence of the Svrsw60t59b > + extension and enable its usage. > + > + The Svrsw60t59b extension allows to free the PTE reserved bits 60 > + and 59 for software to use. > + > + If you don't know what to do here, say Y. > + > config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI > def_bool y > # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc > diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h > index affd63e11b0a..f98fcb5c17d5 100644 > --- a/arch/riscv/include/asm/hwcap.h > +++ b/arch/riscv/include/asm/hwcap.h > @@ -106,6 +106,7 @@ > #define RISCV_ISA_EXT_ZAAMO 97 > #define RISCV_ISA_EXT_ZALRSC 98 > #define RISCV_ISA_EXT_ZICBOP 99 > +#define RISCV_ISA_EXT_SVRSW60T59B 100 > > #define RISCV_ISA_EXT_XLINUXENVCFG 127 > > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c > index 743d53415572..de29562096ff 100644 > --- a/arch/riscv/kernel/cpufeature.c > +++ b/arch/riscv/kernel/cpufeature.c > @@ -540,6 +540,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = { > __RISCV_ISA_EXT_DATA(svnapot, RISCV_ISA_EXT_SVNAPOT), > __RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT), > __RISCV_ISA_EXT_DATA(svvptc, RISCV_ISA_EXT_SVVPTC), > + __RISCV_ISA_EXT_DATA(svrsw60t59b, RISCV_ISA_EXT_SVRSW60T59B), svrsw60t59b should come before svvptc. See the ordering rule comment at the top of the array. Otherwise, Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx> > }; > > const size_t riscv_isa_ext_count = ARRAY_SIZE(riscv_isa_ext); > -- > 2.34.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv
