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hw/intc/arm_gic: Implement read of GICC_IIDR 

Implement support for reading GICC_IIDR. This register is used by the
Linux kernel to recognize that GICv2 with GICC_APRn is present.

Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Message-id: 20220113151916.17978-2-ppavlu@suse.cz
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Petr Pavlu 2022-01-13 16:19:15 +01:00 committed by Peter Maydell
parent b1b87327a9
commit a66a24585f
1 changed files with 9 additions and 0 deletions
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hw/intc/arm_gic.c
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@ -1662,6 +1662,15 @@ static MemTxResult gic_cpu_read(GICState *s, int cpu, int offset,
}
break;
}
case 0xfc:
if (s->revision == REV_11MPCORE) {
/* Reserved on 11MPCore */
*data = 0;
} else {
/* GICv1 or v2; Arm implementation */
*data = (s->revision << 16) | 0x43b;
}
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"gic_cpu_read: Bad offset %x\n", (int)offset);