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target-arm: add emulation of PSCI calls for system emulation

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Add support for handling PSCI calls in system emulation. Both version
0.1 and 0.2 of the PSCI spec are supported. Platforms can enable support
by setting the "psci-conduit" QOM property on the cpus to SMC or HVC
emulation and having a PSCI binding in their dtb.

Signed-off-by: Rob Herring <rob.herring@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1412865028-17725-7-git-send-email-peter.maydell@linaro.org
[PMM: made system reset/off PSCI functions power down the CPU so
 we obey the PSCI API requirement never to return from them;
 rearranged how the code is plumbed into the exception system,
 so that we split "is this a valid call?" from "do the call"]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Rob Herring 2014-10-24 12:19:13 +01:00 • committed by Peter Maydell
parent 37e6456ef5
commit 98128601ac
9 changed files with 301 additions and 3 deletions
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6
target-arm/helper-a64.c
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@ -468,6 +468,12 @@ void aarch64_cpu_do_interrupt(CPUState *cs)
env->exception.syndrome);
}
if (arm_is_psci_call(cpu, cs->exception_index)) {
arm_handle_psci_call(cpu);
qemu_log_mask(CPU_LOG_INT, "...handled as PSCI call\n");
return;
}
switch (cs->exception_index) {
case EXCP_PREFETCH_ABORT:
case EXCP_DATA_ABORT: