Unverified Commit bf4cd841 authored by Clément Léger's avatar Clément Léger Committed by Palmer Dabbelt
Browse files

riscv: hwprobe: export Zfh[min] ISA extensions 

Export Zfh[min] ISA extensions[1] through hwprobe only if FPU support
is available.

Link: https://drive.google.com/file/d/1z3tQQLm5ALsAD77PM0l0CHnapxWCeVzP/view

 [1]
Signed-off-by: default avatarClément Léger <cleger@rivosinc.com>
Reviewed-by: default avatarEvan Green <evan@rivosinc.com>
Link: https://lore.kernel.org/r/20231114141256.126749-11-cleger@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 11e8e1ee

Documentation/arch/riscv/hwprobe.rst

+6 −0
Original line number Diff line number Diff line
@@ -140,6 +140,12 @@ The following keys are defined: 
  * :c:macro:`RISCV_HWPROBE_EXT_ZVKT`: The Zvkt extension is supported as

       defined in version 1.0 of the RISC-V Cryptography Extensions Volume II.



  * :c:macro:`RISCV_HWPROBE_EXT_ZFH`: The Zfh extension version 1.0 is supported

       as defined in the RISC-V ISA manual.



  * :c:macro:`RISCV_HWPROBE_EXT_ZFHMIN`: The Zfhmin extension version 1.0 is

       supported as defined in the RISC-V ISA manual.



* :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance

  information about the selected set of processors.

arch/riscv/include/uapi/asm/hwprobe.h

+2 −0
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ struct riscv_hwprobe { 
#define		RISCV_HWPROBE_EXT_ZVKSED	(1 << 24)

#define		RISCV_HWPROBE_EXT_ZVKSH		(1 << 25)

#define		RISCV_HWPROBE_EXT_ZVKT		(1 << 26)

#define		RISCV_HWPROBE_EXT_ZFH		(1 << 27)

#define		RISCV_HWPROBE_EXT_ZFHMIN	(1 << 28)

#define RISCV_HWPROBE_KEY_CPUPERF_0	5

#define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)

#define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)

arch/riscv/kernel/sys_riscv.c

+5 −0
Original line number Diff line number Diff line
@@ -186,6 +186,11 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair, 
			EXT_KEY(ZVKSH);

			EXT_KEY(ZVKT);

		}



		if (has_fpu()) {

			EXT_KEY(ZFH);

			EXT_KEY(ZFHMIN);

		}

#undef EXT_KEY

	}