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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
Download patch file Download diff file Expand all files Collapse all files

16
target-arm/op_helper.c
View file

@ -387,11 +387,19 @@ void HELPER(clear_pstate_ss)(CPUARMState *env)
void HELPER(pre_hvc)(CPUARMState *env)
{
ARMCPU *cpu = arm_env_get_cpu(env);
int cur_el = arm_current_pl(env);
/* FIXME: Use actual secure state. */
bool secure = false;
bool undef;
if (arm_is_psci_call(cpu, EXCP_HVC)) {
/* If PSCI is enabled and this looks like a valid PSCI call then
* that overrides the architecturally mandated HVC behaviour.
*/
return;
}
if (!arm_feature(env, ARM_FEATURE_EL2)) {
/* If EL2 doesn't exist, HVC always UNDEFs */
undef = true;
@ -419,6 +427,7 @@ void HELPER(pre_hvc)(CPUARMState *env)
void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome)
{
ARMCPU *cpu = arm_env_get_cpu(env);
int cur_el = arm_current_pl(env);
/* FIXME: Use real secure state. */
bool secure = false;
@ -430,6 +439,13 @@ void HELPER(pre_smc)(CPUARMState *env, uint32_t syndrome)
*/
bool undef = is_a64(env) ? smd : (!secure && smd);
if (arm_is_psci_call(cpu, EXCP_SMC)) {
/* If PSCI is enabled and this looks like a valid PSCI call then
* that overrides the architecturally mandated SMC behaviour.
*/
return;
}
if (!arm_feature(env, ARM_FEATURE_EL3)) {
/* If we have no EL3 then SMC always UNDEFs */
undef = true;