Re: [Qemu-devel] [Qemu-ppc] [PATCH 1/4] spapr: Add rtas_st_buffer utility function

[Alexander Graf <agraf@suse.de>]

On 24.06.14 02:22, Sam Bobroff wrote:
> Add a function to write lengh + data into a buffer as required for the
> emulation of the RTAS ibm,get-system-parameter call.
>
> If the destination is smaller than the source, the write is truncated
> and success is returned. This matches the behaviour of pHyp.
>
> This will be used in following patches.
>
> Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
> ---
>   include/hw/ppc/spapr.h | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
>
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 08c301f..39a7764 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -373,6 +373,23 @@ static inline void rtas_st(target_ulong phys, int n, uint32_t val)
>       stl_be_phys(&address_space_memory, ppc64_phys_to_real(phys + 4*n), val);
>   }
>   
> +
> +static inline void rtas_st_buffer(target_ulong phys, target_ulong phys_len,
> +                                  uint8_t *buffer, uint16_t buffer_len)
> +{
> +    uint16_t i;
> +
> +    if (phys_len < 2) {
> +        return;
> +    }
> +    stw_be_phys(&address_space_memory,
> +                ppc64_phys_to_real(phys), buffer_len);
> +    for (i = 0; i < MIN(buffer_len, phys_len - 2); i++) {
> +        stb_phys(&address_space_memory,
> +                 ppc64_phys_to_real(phys + 2 + i), buffer[i]);
> +    }

cpu_physical_memory_write()?


Alex