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Re: [Qemu-ppc] [Qemu-devel] [PATCH] pseries: Implements h_read hcall


From: Andreas Färber
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] pseries: Implements h_read hcall
Date: Sun, 17 Feb 2013 12:06:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130105 Thunderbird/17.0.2

Am 15.02.2013 11:59, schrieb Erlon Cruz:
> From: Erlon Cruz <address@hidden>
> 
> This h_call is useful for DLPAR in future amongst other things. Given an index
> it fetches the corresponding PTE stored in the htab.
> 
> Signed-off-by: Erlon Cruz <address@hidden>
> ---
>  hw/spapr_hcall.c |   34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c
> index 2889742..1065277 100644
> --- a/hw/spapr_hcall.c
> +++ b/hw/spapr_hcall.c
> @@ -323,6 +323,39 @@ static target_ulong h_protect(PowerPCCPU *cpu, 
> sPAPREnvironment *spapr,
>      return H_SUCCESS;
>  }
>  
> +static target_ulong h_read(PowerPCCPU *cpu, sPAPREnvironment *spapr,
> +                            target_ulong opcode, target_ulong *args)

Indentation is one-off.

Andreas

> +{
> +    CPUPPCState *env = &cpu->env;
> +    target_ulong flags = args[0];
> +    target_ulong pte_index = args[1];
> +    target_ulong v[4], r[4];
> +    uint8_t *hpte;
> +    int i, ridx, n_entries = 1;
> +
> +    if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {
> +        return H_PARAMETER;
> +    }
> +
> +    if (flags & H_READ_4) {
> +        /* Clear the two low order bits */
> +        pte_index &= ~(3ULL);
> +        n_entries = 4;
> +    }
> +
> +    hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
> +
> +    for (i = 0, ridx = 0; i < n_entries; i++) {
> +        v[i] = ldq_p(hpte);
> +        r[i] = ldq_p(hpte + (HASH_PTE_SIZE_64/2));
> +        args[ridx++] = v[i];
> +        args[ridx++] = r[i];
> +        hpte += HASH_PTE_SIZE_64;
> +    }
> +
> +    return H_SUCCESS;
> +}
> +
>  static target_ulong h_set_dabr(PowerPCCPU *cpu, sPAPREnvironment *spapr,
>                                 target_ulong opcode, target_ulong *args)
>  {
> @@ -714,6 +747,7 @@ static void hypercall_register_types(void)
>      spapr_register_hypercall(H_ENTER, h_enter);
>      spapr_register_hypercall(H_REMOVE, h_remove);
>      spapr_register_hypercall(H_PROTECT, h_protect);
> +    spapr_register_hypercall(H_READ, h_read);
>  
>      /* hcall-bulk */
>      spapr_register_hypercall(H_BULK_REMOVE, h_bulk_remove);

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