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This change allows all CPU cores to jump into kernel on zynq7000 (both real hardware and QEMU).
Description
The procedure of starting other CPU cores on zynq7000 is substantially different on QEMU and real hardware. On QEMU both cores jump to start of PLO code. On real hardware boot ROM parks CPU 1 in a small bit of code in high OCRAM that monitors memory address
0xfffffff0
and sleeps usingwfe
. In order to achieve the same behavior on QEMU code was added into_init.S
that parks all other CPU cores in the same fashion.After change CPU 0 signals other cores that they should jump to kernel before jumping to kernel itself.
Motivation and Context
Required to allow use of SMP kernel on zynq7000.
Types of changes
How Has This Been Tested?
Checklist:
Special treatment