PSCI via EFI#618
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We're about to add PSCI code that will be called after the OS has booted and taken over control over most hardware, especially the USB ports. From all the available iodevs only dockchannel and the Samsung UART are simple enough to still be used in that context. Signed-off-by: Sven Peter <sven@svenpeter.dev>
Pre-M1 SoCs support 64 KiB pagesizes and we will need to map m1n1's text and data sections from inside the booted OS kernel to provide PSCI support. Align all section to 64 KiB so that this is cleanly possible. Signed-off-by: Sven Peter <sven@svenpeter.dev>
We're about to add PSCI code that will run inside the OS kernel with the kernel having full control over the pagetables. When stacks are allocated on the heap we have to specifically map them as EFI RUNTIME descriptors which is a bit annoying to get right. Instead, just put them into .bss which will be mapped anyway. This increases .bss by a bit more than 1MB which is negligible on these machines with >8GiB RAM. Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
The ADT is no longer available once we're called into from PSCI but we may need to bring up or down cores. Just cache all the information we need. Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
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