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ArmPkg/OpteeLib: Add dummy RPC handler 

Add dummy RPC handler for RPCs that are not implemented as control
should be returned back to OP-TEE in case any RPC is invoked.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Sumit Garg 2018-12-05 17:27:45 +05:30 committed by Ard Biesheuvel
parent bc39c5cbea
commit 088a533480
2 changed files with 30 additions and 7 deletions
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34
ArmPkg/Library/OpteeLib/Optee.c
View File

@ -123,6 +123,17 @@ OpteeInit (
return EFI_SUCCESS;
}
STATIC
BOOLEAN
IsOpteeSmcReturnRpc (
UINT32 Return
)
{
return (Return != OPTEE_SMC_RETURN_UNKNOWN_FUNCTION) &&
((Return & OPTEE_SMC_RETURN_RPC_PREFIX_MASK) ==
OPTEE_SMC_RETURN_RPC_PREFIX);
}
/**
Does Standard SMC to OP-TEE in secure world.
@ -147,13 +158,22 @@ OpteeCallWithArg (
while (TRUE) {
ArmCallSmc (&ArmSmcArgs);
if (ArmSmcArgs.Arg0 == OPTEE_SMC_RETURN_RPC_FOREIGN_INTERRUPT) {
//
// A foreign interrupt was raised while secure world was
// executing, since they are handled in UEFI a dummy RPC is
// performed to let UEFI take the interrupt through the normal
// vector.
//
if (IsOpteeSmcReturnRpc (ArmSmcArgs.Arg0)) {
switch (ArmSmcArgs.Arg0) {
case OPTEE_SMC_RETURN_RPC_FOREIGN_INTERRUPT:
//
// A foreign interrupt was raised while secure world was
// executing, since they are handled in UEFI a dummy RPC is
// performed to let UEFI take the interrupt through the normal
// vector.
//
break;
default:
// Do nothing in case RPC is not implemented.
break;
}
ArmSmcArgs.Arg0 = OPTEE_SMC_RETURN_FROM_RPC;
} else {
break;

3
ArmPkg/Library/OpteeLib/OpteeSmc.h
View File

@ -25,6 +25,9 @@
#define OPTEE_SMC_SHARED_MEMORY_CACHED 1
#define OPTEE_SMC_RETURN_UNKNOWN_FUNCTION 0xffffffff
#define OPTEE_SMC_RETURN_RPC_PREFIX_MASK 0xffff0000
#define OPTEE_SMC_RETURN_RPC_PREFIX 0xffff0000
#define OPTEE_SMC_RETURN_RPC_FOREIGN_INTERRUPT 0xffff0004
#define OPTEE_MESSAGE_COMMAND_OPEN_SESSION 0