Nicolas Pitre 26d7bd47a0 riscv: decouple the Zephyr CPU number from the hart ID ... Currently it is assumed that Zephyr CPU numbers match their hartid value one for one. This assumption was relied upon to efficiently retrieve the current CPU's `struct _cpu` pointer. People are starting to have systems with a mix of different usage for each CPU and such assumption may no longer be true. Let's completely decouple the hartid from the Zephyr CPU number by stuffing each CPU's `struct _cpu` pointer in their respective scratch register instead. `arch_curr_cpu()` becomes more efficient as well. Since the scratch register was previously used to store userspace's exception stack pointer, that is now moved into `struct _cpu_arch` which implied minor user space entry code cleanup and rationalization. Signed-off-by: Nicolas Pitre <npitre@baylibre.com>		2023-01-19 13:48:42 +01:00
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zephyr	riscv: decouple the Zephyr CPU number from the hart ID	2023-01-19 13:48:42 +01:00