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

[Fabiano Rosas <farosas@linux.ibm.com>]

David Gibson <david@gibson.dropbear.id.au> writes:

> 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?

You're right, this is a bit clumsy.

I just checked and the single step works within SLOF code as well, so
I'll probably need to borrow the AIL-checking logic from excp_helper.c
to get the correct offset so this patch is likely to go away.

Cheers.