Story 5.1 — Secondary core bring-up

[Abhinkop]

Goal

Bring secondary CPU cores online so that the kernel can execute tasks in parallel.

Tasks

• Parse CPU nodes from FDT to discover secondary MPIDR values
• Implement PSCI CPU_ON (SMC call) to wake each secondary core
• Write secondary entry point: set up stack, install exception vectors, enable MMU (reuse TTBR1), call secondary_main()
• secondary_main(): print core ID via UART, enter scheduler loop