Re: [Qemu-devel] [RFC PATCH v2 1/3] target/ppc: Add macro definitions for relocated interrupt vectors offsets

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Nov 21, 2018 at 04:13:45PM -0200, Fabiano Rosas wrote:
> The PowerISA prescribes that depending on the values of MSR_IR,
> MSR_DR, MSR_HV and LPCR_AIL, the interrupt vectors might be relocated
> by specific offsets.
> 
> This patch defines macros for these offsets so that they can be used
> by another part of the code in a future patch.
> 
> Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
> ---
>  target/ppc/cpu.h         | 3 +++
>  target/ppc/excp_helper.c | 4 ++--
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> index ab68abe8a2..5147db4460 100644
> --- a/target/ppc/cpu.h
> +++ b/target/ppc/cpu.h
> @@ -2390,6 +2390,9 @@ enum {
>      AIL_C000_0000_0000_4000 = 3,
>  };
>  
> +#define AIL_0001_8000_OFFSET 0x18000
> +#define AIL_C000_0000_0000_4000_OFFSET 0xc000000000004000ull

Hrm.  Is there really a point making a #define, if the name spells out
the value?  It's not like you can change the value without having to
change the places that use it that way?


>  /*****************************************************************************/
>  
>  #define is_isa300(ctx) (!!(ctx->insns_flags2 & PPC2_ISA300))
> diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
> index 0ec7ae1ad4..49bdf7dd54 100644
> --- a/target/ppc/excp_helper.c
> +++ b/target/ppc/excp_helper.c
> @@ -687,10 +687,10 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
>          new_msr |= (1 << MSR_IR) | (1 << MSR_DR);
>          switch(ail) {
>          case AIL_0001_8000:
> -            vector |= 0x18000;
> +            vector |= AIL_0001_8000_OFFSET;
>              break;
>          case AIL_C000_0000_0000_4000:
> -            vector |= 0xc000000000004000ull;
> +            vector |= AIL_C000_0000_0000_4000_OFFSET;
>              break;
>          default:
>              cpu_abort(cs, "Invalid AIL combination %d\n", ail);

-- 
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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