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SecurityPkg/RngDxe: Add Arm support of RngDxe

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Bugzilla: 3668 (https://bugzilla.tianocore.org/show_bug.cgi?id=3668)

Add RngDxe support for Arm. This implementation uses the ArmTrngLib
to support the RawAlgorithm and doens't support the RNDR instruction.

To re-use the RngGetRNG(), RngGetInfo() and FreeAvailableAlgorithms()
functions, create Arm/AArch64 files which implement the arch specific
function GetAvailableAlgorithms(). Indeed, FEAT_RNG instruction is not
supported on Arm.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Pierre Gondois
2022-10-28 17:32:58 +02:00
committed by mergify[bot]
parent ff29cdb968
commit 9eb5ccda50
5 changed files with 133 additions and 64 deletions
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60
SecurityPkg/RandomNumberGenerator/RngDxe/ArmRngDxe.c
View File

@ -28,70 +28,10 @@
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/RngLib.h>
#include <Library/DebugLib.h>
#include <Library/ArmTrngLib.h>
#include <Protocol/Rng.h>
#include "RngDxeInternals.h"
// Maximum number of Rng algorithms.
#define RNG_AVAILABLE_ALGO_MAX 2
/** Allocate and initialize mAvailableAlgoArray with the available
Rng algorithms. Also update mAvailableAlgoArrayCount.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_OUT_OF_RESOURCES Could not allocate memory.
**/
EFI_STATUS
EFIAPI
GetAvailableAlgorithms (
VOID
)
{
UINT64 DummyRand;
UINT16 MajorRevision;
UINT16 MinorRevision;
// Rng algorithms 2 times, one for the allocation, one to populate.
mAvailableAlgoArray = AllocateZeroPool (RNG_AVAILABLE_ALGO_MAX);
if (mAvailableAlgoArray == NULL) {
return EFI_OUT_OF_RESOURCES;
}
// Check RngGetBytes() before advertising PcdCpuRngSupportedAlgorithm.
if (!EFI_ERROR (RngGetBytes (sizeof (DummyRand), (UINT8 *)&DummyRand))) {
CopyMem (
&mAvailableAlgoArray[mAvailableAlgoArrayCount],
PcdGetPtr (PcdCpuRngSupportedAlgorithm),
sizeof (EFI_RNG_ALGORITHM)
);
mAvailableAlgoArrayCount++;
DEBUG_CODE_BEGIN ();
if (IsZeroGuid (PcdGetPtr (PcdCpuRngSupportedAlgorithm))) {
DEBUG ((
DEBUG_WARN,
"PcdCpuRngSupportedAlgorithm should be a non-zero GUID\n"
));
}
DEBUG_CODE_END ();
}
// Raw algorithm (Trng)
if (!EFI_ERROR (GetArmTrngVersion (&MajorRevision, &MinorRevision))) {
CopyMem (
&mAvailableAlgoArray[mAvailableAlgoArrayCount],
&gEfiRngAlgorithmRaw,
sizeof (EFI_RNG_ALGORITHM)
);
mAvailableAlgoArrayCount++;
}
return EFI_SUCCESS;
}
/** Free mAvailableAlgoArray.
**/
VOID