riscv: Add ISA extension parsing for pointer masking

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The RISC-V Pointer Masking specification defines three extensions:
Smmpm, Smnpm, and Ssnpm. Add support for parsing each of them. The
specific extension which provides pointer masking support to userspace
(Supm) depends on the kernel's privilege mode, so provide a macro to
abstract this selection.

Smmpm implies the existence of the mseccfg CSR. As it is the only user
of this CSR so far, there is no need for an Xlinuxmseccfg extension.

Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/r/20241016202814.4061541-3-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Samuel Holland 2024-10-16 13:27:43 -07:00 • committed by Palmer Dabbelt

parent 8727163a1a

commit 2e6f6ea452

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5

arch/riscv/include/asm/hwcap.h

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3

arch/riscv/kernel/cpufeature.c

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