Re: [Qemu-devel] [PATCH] target-ppc: Extend HWCAP2 bits for ISA 3.0

[David Gibson]

On Thu, Sep 06, 2018 at 12:27:29PM +0530, Sandipan Das wrote:
> This adds the HWCAP2 bit to detect if a linux user process is
> running on an ISA 3.0 compliant cpu like POWER9. This can be
> verified using a simple test program that prints the value in
> the auxiliary vector for AT_HWCAP2 as shown below.
> 
> Before:
>   $ qemu-ppc64le -cpu power8 test
>   0x8c000000
> 
>   $ qemu-ppc64le -cpu power9 test
>   0x8c000000
> 
> After:
>   $ qemu-ppc64le -cpu power8 test
>   0x8c000000
> 
>   $ qemu-ppc64le -cpu power9 test
>   0x8c800000
> 
> Signed-off-by: Sandipan Das <address@hidden>

Applied, thanks.

> ---
>  linux-user/elfload.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index 8638612aec..e97c4cde49 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -710,6 +710,7 @@ enum {
>      QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
>      QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
>      QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
> +    QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
>  };
>  
>  #define ELF_HWCAP get_elf_hwcap()
> @@ -764,6 +765,7 @@ static uint32_t get_elf_hwcap2(void)
>      GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
>      GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
>                    PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);
> +    GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00);
>  
>  #undef GET_FEATURE
>  #undef GET_FEATURE2

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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