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| GICv3 memory mapped registers always 0 https://forum.osdev.org/viewtopic.php?f=1&t=43342 |
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| Author: | ARMy [ Sun May 02, 2021 1:00 pm ] |
| Post subject: | GICv3 memory mapped registers always 0 |
Hi, 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. Code: ldr x0, =0x8000380 GICD_ICACTIVER ldr w1, =0x0xffffffff str w1, [x0] dsb sy ldr w2, [x0] >>> info register x2 x2 0x0 0 >>> x/1w 0x8000380 0x8000380 0 Can someone give me please a hint what the problem could be? |
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| 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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