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which register are dedicated for each MPCore in ARMv8-A architecture?

Hi Expert,

I'm a beginner to ARMv8-A architecture MPcore and now studying A35 MPCore processor documents for low-level software developing.

One question, when I read DDI0487C_a_armv8_arm and DEN0024A_v8_architecture_PG, from my understanding, there are 3 types of register in general, general-purpose register, AArch64 special registers(e.g SP_ELx) and System registers(e.g. TTBR0_EL1 ) in AArch64 state, so are all these register dedicated for each core? or any register shared for all core?

Best Regards.

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Martin Weidmann over 7 years ago +1 verified

For the register types you mentioned, these are all per-core. That is, each core has an independent copy and can only see it's copy.

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0 42Bastian Schick over 7 years ago

These are per-core registers. In general ARM documents state if registers are shadowed. For example some of the registers like TTBR0 exist twice. Once for normal and a second time for secure world.

In contrast: The GIC contains global and per-core registers. But the GIC is a peripheral with respect to the core.
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0 42Bastian Schick over 7 years ago

These are per-core registers. In general ARM documents state if registers are shadowed. For example some of the registers like TTBR0 exist twice. Once for normal and a second time for secure world.

In contrast: The GIC contains global and per-core registers. But the GIC is a peripheral with respect to the core.
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