Re: [Xen-devel] [PATCH v2 3/4] xen:arm: arm64: Add correct MPIDR_HWID_MASK value for ARM64

[Julien Grall <julien.grall@xxxxxxx>]

Hi Wei,

On 26/05/16 08:58, Wei Chen wrote:
> Currently, MPIDR_HWID_MASK is using the bit definition of AArch32 MPIDR.
>  From ARMv8 ARM we can see there are 4 levels of affinity on AArch64
> whilst AArch32 has only 3. So, this value is not correct when Xen is
> running on AArch64.
>
> Now, we use the value 0xff00ffffff for this macro on AArch64. But neither
> of this value and its bitwise invert value can be used in mov instruction
> with the encoding of {imm16:shift} or {imms:immr}. So we have to use ldr
> to load the bitwise invert value to register.
>
> The details of mov immediate encoding are listed in ARMv8 ARM C4.2.5.
The section numbering may change between two versions of the spec. I 
would mention the version (e.g DDI 0487A.i, I guess?).
Regards,

--
Julien Grall

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