The M1 Pro/Max Macs use a different base address for the UART and the
WDT than earlier models.
Remove hardcoded base addresses constants and replace them with loads
from the ADT.
- The base address of the WDT is already retrieved in wdt_disable; also
use this address when triggering a reboot.
- Retrieve the base address of uart0 in uart_init. If the operation
fails, the error will be signaled on the early uart (if not disabled).
- The early debug UART can’t use the ADT (or shouldn’t) so it is now
disabled by default. To enable it, add
-DEARLY_UART -DEARLY_UART_BASE=0xuart_address
to the CFLAGS.
Signed-off-by: Vincent Duvert <vincent@duvert.net>
This lets us test register access and other features from EL0.
No serious attempt at security is made, but at least EL0 runs off of a
separate stack and can return to EL2 at any time with `brk`; we can
easily implement a guard mode to break straight to EL2 on exception
later if needed.
Signed-off-by: Hector Martin <marcan@marcan.st>
