[PATCH v2 02/19] riscv: add ISA extension parsing for scalar crypto

[Clément Léger]

On 23/10/2023 18:21, Evan Green wrote:
> On Tue, Oct 17, 2023 at 6:15 AM Clément Léger <cleger at rivosinc.com> wrote:
>>
>> From: Evan Green <evan at rivosinc.com>
>>
>> The Scalar Crypto specification defines Zk as a shorthand for the
>> Zkn, Zkr and Zkt extensions. The same follows for both Zkn, Zks and Zbk,
>> which are all shorthands for various other extensions. The detailed
>> breakdown can be found in their dt-binding entries.
>>
>> Since Zkn also implies the Zbkb, Zbkc and Zbkx extensions, simply passing
>> "zk" through a DT should enable all of Zbkb, Zbkc, Zbkx, Zkn, Zkr and Zkt.
>> For example, setting the "riscv,isa" DT property to "rv64imafdc_zk"
>> should generate the following cpuinfo output:
>> "rv64imafdc_zicntr_zicsr_zifencei_zihpm_zbkb_zbkc_zbkx_zknd_zkne_zknh_zkr_zkt"
>>
>> riscv_isa_ext_data grows a pair of new members, to permit setting the
>> relevant bits for "bundled" extensions, both while parsing the ISA string
>> and the new dedicated extension properties
>>
>> Co-developed-by: Conor Dooley <conor.dooley at microchip.com>
>> Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
>> Signed-off-by: Evan Green <evan at rivosinc.com>
>> Signed-off-by: Clément Léger <cleger at rivosinc.com>
> 
> My tree might be out of sync, but in my search for riscv_isa_ext, I
> also found a use in print_isa() (cpu.c) where we're reaching into
> riscv_isa_ext[].id and assuming it's always valid. If that's still in
> there we'll want to fix up that spot too, since now with bundles .id
> may or may not be valid.

Oh indeed, the array is visible outside of this compilation unit :/.
I'll check that before sending V3.

Clément

> 
> -Evan