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All consumers of profile_timestamp() currently treat the value as an unsigned long. Only the elapsed number of ticks is ever relevant: the absolute value of the timestamp is not used. Profiling is used to measure short durations that are generally fewer than a million CPU cycles, for which an unsigned long is easily large enough. Standardise the return type of profile_timestamp() as unsigned long across all CPU architectures. This allows 32-bit architectures such as i386 and riscv32 to omit all logic associated with retrieving the upper 32 bits of the 64-bit hardware counter, which simplifies the code and allows riscv32 and riscv64 to share the same implementation. Signed-off-by: Michael Brown <mcb30@ipxe.org>