|GICv3 memory mapped registers always 0
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|Author:||ARMy [ Sun May 02, 2021 1:00 pm ]|
|Post subject:||GICv3 memory mapped registers always 0|
I am trying to get interrupts working on my operating system for ARMv8 on QEMU. But when I read the GICv3 memory mapped registers after writing, they are always 0.
ldr x0, =0x8000380 GICD_ICACTIVER
ldr w1, =0x0xffffffff
str w1, [x0]
ldr w2, [x0]
>>> info register x2
x2 0x0 0
>>> x/1w 0x8000380
Can someone give me please a hint what the problem could be?
|Author:||qookie [ Tue May 04, 2021 6:27 am ]|
|Post subject:||Re: GICv3 memory mapped registers always 0|
Are you sure the GIC base is 0x8000000? Did you map it in as device nGnR(nE/E) memory (qemu doesn't really care but real hardware does care a lot)? Do you see any values at all? Try reading from GICD_IIDR, which is at offset 0x08 from the base of the distributor, and seeing if that also returns all 0s.
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