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SubjectRe: [PATCH] ARM: proc: Add Krait proc info
On 03/05/13 00:34, Will Deacon wrote:
> Hi Stephen, Stepan,
>
> On Mon, Mar 04, 2013 at 11:21:39PM +0000, Stephen Boyd wrote:
>> From: Stepan Moskovchenko <stepanm@codeaurora.org>
>>
>> Add processor info for the Qualcomm, Inc. Krait family of
>> processors, to use the generic ARMv7 initialisation
>> procedure but explicitly enable the IDIV hardware
>> capability flag.
>>
>> Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
>> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
>> ---
>> arch/arm/mm/proc-v7.S | 10 ++++++++++
>> 1 file changed, 10 insertions(+)
>>
>> diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
>> index 3a3c015..81adeb3 100644
>> --- a/arch/arm/mm/proc-v7.S
>> +++ b/arch/arm/mm/proc-v7.S
>> @@ -434,6 +434,16 @@ __v7_ca15mp_proc_info:
>> .size __v7_ca15mp_proc_info, . - __v7_ca15mp_proc_info
>>
>> /*
>> + * Qualcomm Inc. Krait processors.
>> + */
>> + .type __krait_proc_info, #object
>> +__krait_proc_info:
>> + .long 0x510f0400 @ Required ID value
>> + .long 0xff0ffc00 @ Mask for ID
>> + __v7_proc __v7_setup, hwcaps = HWCAP_IDIV
> I was looking at this the other day and wondered whether we could set
> HWCAP_IDIV in __v7_setup, depending on ID_ISAR0[27:24]. I can't immediately
> think why that would be difficult, but similarly there may well be a reason
> why we assign it like this.
>
> Fancy taking a look?

Ok I'll take a look. Should we be masking out HWCAP_IDIVT on
!CONFIG_ARM_THUMB configurations?

----8<-----

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 3f6cbb2..e2c8bbf 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -484,7 +484,7 @@ static void __init setup_processor(void)
list->elf_name, ENDIANNESS);
elf_hwcap = list->elf_hwcap;
#ifndef CONFIG_ARM_THUMB
- elf_hwcap &= ~HWCAP_THUMB;
+ elf_hwcap &= ~(HWCAP_THUMB | HWCAP_IDIVT);
#endif

feat_v6_fixup();
--
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