SMCCC for aarch64

[Robin Kim]

I wonder SMCCC for aarch64.

When I look at the include/uapi/linux/psci.h, the base for aarch64 is PSCI_0_2_FN64_BASE which has PSCI_0_2_FN_BASE + PSCI_0_2_64BIT (0xC4000000)

hafnium looks has aarch32 in func identifier.

for example,

0x83000000-0x8300FFFF : SMC32: OEM Service Calls

0x84000000-0x8400FFFF : SMC32: Standard Service Calls

0xC3000000-0xC300FFFF : SMC64: OEM Service Calls

0xC4000000-0xC400FFFF : SMC64: Standard Service Calls

[Andrew Scull]

The SMCCC_CONVENTION_MASK is used to toggle between 32 and 64-bit mode. Looks like both versions are handled today.

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