Hi Maurice,
it's a copy of the MdeModulePkg's BaseRngLib with runtime detection support.
Are the MdeModulePkg maintainers OK with adding runtime detection support?
I had the impression that it should only be used on platforms
supporting rdrand for sure, and therefore
must not be used on platforms not supporting rdrand.
Kind Regards,
Patrick Rudolph
On Thu, Jan 21, 2021 at 1:42 AM Ma, Maurice <maurice...@intel.com> wrote:
>
> Hi, Patrick
>
> There is a BaseRngLib in MdePkg package already. I am wondering why a new
> instance was created under UefiPayloadPkg in the patch.
> Could we just reuse the same library in MdePkg?
> If not, what is the reason? Can we try to enhance the library in MdePkg to
> address it if required?
>
> Thanks
> Maurice
> > -----Original Message-----
> > From: Patrick Rudolph <patrick.rudo...@9elements.com>
> > Sent: Wednesday, January 20, 2021 7:52
> > To: devel@edk2.groups.io
> > Cc: Ma, Maurice <maurice...@intel.com>; Dong, Guo <guo.d...@intel.com>;
> > You, Benjamin <benjamin....@intel.com>
> > Subject: [PATCH] UefiPayloadPkg: Add RNG support
> >
> > Uses the RDRAND instruction if available and install EfiRngProtocol.
> > The protocol may be used by iPXE or the Linux kernel to gather entropy.
> >
> > Signed-off-by: Patrick Rudolph <patrick.rudo...@9elements.com>
> > ---
> > UefiPayloadPkg/Library/BaseRngLib/BaseRng.c | 199
> > ++++++++++++++++++++
> > UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.inf | 32 ++++
> > UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.uni | 17 ++
> > UefiPayloadPkg/UefiPayloadPkg.dsc | 8 +
> > UefiPayloadPkg/UefiPayloadPkg.fdf | 4 +
> > 5 files changed, 260 insertions(+)
> >
> > diff --git a/UefiPayloadPkg/Library/BaseRngLib/BaseRng.c
> > b/UefiPayloadPkg/Library/BaseRngLib/BaseRng.c
> > new file mode 100644
> > index 0000000000..1fe9e1dbe0
> > --- /dev/null
> > +++ b/UefiPayloadPkg/Library/BaseRngLib/BaseRng.c
> > @@ -0,0 +1,199 @@
> > +/** @file+ Random number generator services that uses RdRand instruction
> > access+ to provide high-quality random numbers.++Copyright (c) 2015, Intel
> > Corporation. All rights reserved.<BR>+SPDX-License-Identifier: BSD-2-Clause-
> > Patent++**/++#include <Library/BaseLib.h>+#include
> > <Library/DebugLib.h>+#include <Register/Intel/Cpuid.h>++STATIC BOOLEAN
> > mHasRdRand;++//+// Bit mask used to determine if RdRand instruction is
> > supported.+//+#define RDRAND_MASK BIT30++//+// Limited
> > retry
> > number when valid random data is returned.+// Uses the recommended value
> > defined in Section 7.3.17 of "Intel 64 and IA-32+// Architectures Software
> > Developer's Mannual".+//+#define RDRAND_RETRY_LIMIT 10++/**+ The
> > constructor function checks whether or not RDRAND instruction is supported+
> > by the host hardware.++ The constructor function checks whether or not
> > RDRAND instruction is supported.+ It will always return RETURN_SUCCESS.++
> > @retval RETURN_SUCCESS The constructor always returns
> > EFI_SUCCESS.++**/+RETURN_STATUS+EFIAPI+BaseRngLibConstructor (+
> > VOID+ )+{+ UINT32 RegEax;+ UINT32 RegEcx;++ AsmCpuid
> > (CPUID_SIGNATURE, &RegEax, NULL, NULL, NULL);+ if (RegEax < 1) {+
> > mHasRdRand = FALSE;+ return RETURN_SUCCESS;+ }++ //+ // Determine
> > RDRAND support by examining bit 30 of the ECX register returned by+ //
> > CPUID.
> > A value of 1 indicates that processor support RDRAND instruction.+ //+
> > AsmCpuid (CPUID_VERSION_INFO, 0, 0, &RegEcx, 0);++ mHasRdRand =
> > ((RegEcx & RDRAND_MASK) == RDRAND_MASK);++ return
> > RETURN_SUCCESS;+}++/**+ Generates a 16-bit random number.++ if Rand is
> > NULL, then ASSERT().++ @param[out] Rand Buffer pointer to store the
> > 16-bit
> > random value.++ @retval TRUE Random number generated successfully.+
> > @retval FALSE Failed to generate the random
> > number.++**/+BOOLEAN+EFIAPI+GetRandomNumber16 (+ OUT UINT16
> > *Rand+ )+{+ UINT32 Index;++ ASSERT (Rand != NULL);++ if (mHasRdRand) {+
> > //+ // A loop to fetch a 16 bit random value with a retry count limit.+
> > //+
> > for (Index = 0; Index < RDRAND_RETRY_LIMIT; Index++) {+ if (AsmRdRand16
> > (Rand)) {+ return TRUE;+ }+ }+ }++ return FALSE;+}++/**+
> > Generates a
> > 32-bit random number.++ if Rand is NULL, then ASSERT().++ @param[out]
> > Rand Buffer pointer to store the 32-bit random value.++ @retval TRUE
> > Random number generated successfully.+ @retval FALSE Failed to
> > generate
> > the random number.++**/+BOOLEAN+EFIAPI+GetRandomNumber32 (+ OUT
> > UINT32 *Rand+ )+{+ UINT32 Index;++ ASSERT (Rand !=
> > NULL);++ if
> > (mHasRdRand) {+ //+ // A loop to fetch a 32 bit random value with a
> > retry
> > count limit.+ //+ for (Index = 0; Index < RDRAND_RETRY_LIMIT;
> > Index++) {+
> > if (AsmRdRand32 (Rand)) {+ return TRUE;+ }+ }+ }++ return
> > FALSE;+}++/**+ Generates a 64-bit random number.++ if Rand is NULL, then
> > ASSERT().++ @param[out] Rand Buffer pointer to store the 64-bit random
> > value.++ @retval TRUE Random number generated successfully.+
> > @retval
> > FALSE Failed to generate the random
> > number.++**/+BOOLEAN+EFIAPI+GetRandomNumber64 (+ OUT UINT64
> > *Rand+ )+{+ UINT32 Index;++ ASSERT (Rand != NULL);++ if (mHasRdRand) {+
> > //+ // A loop to fetch a 64 bit random value with a retry count limit.+
> > //+
> > for (Index = 0; Index < RDRAND_RETRY_LIMIT; Index++) {+ if (AsmRdRand64
> > (Rand)) {+ return TRUE;+ }+ }+ }++ return FALSE;+}++/**+
> > Generates a
> > 128-bit random number.++ if Rand is NULL, then ASSERT().++ @param[out]
> > Rand Buffer pointer to store the 128-bit random value.++ @retval TRUE
> > Random number generated successfully.+ @retval FALSE Failed to
> > generate
> > the random number.++**/+BOOLEAN+EFIAPI+GetRandomNumber128 (+ OUT
> > UINT64 *Rand+ )+{+ ASSERT (Rand != NULL);++ //+ //
> > Read first 64
> > bits+ //+ if (!GetRandomNumber64 (Rand)) {+ return FALSE;+ }++ //+
> > //
> > Read second 64 bits+ //+ return GetRandomNumber64 (++Rand);+}diff --git
> > a/UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.inf
> > b/UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.inf
> > new file mode 100644
> > index 0000000000..67a91ccfff
> > --- /dev/null
> > +++ b/UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.inf
> > @@ -0,0 +1,32 @@
> > +## @file+# Instance of RNG (Random Number Generator) Library.+#+#
> > Copyright (c) 2020 9elements Agency GmbH.<BR>+#+# SPDX-License-Identifier:
> > BSD-2-Clause-Patent+#+##++[Defines]+ INF_VERSION =
> > 0x00010005+ BASE_NAME = BaseRngLib+ MODULE_UNI_FILE
> > = BaseRngLib.uni+ FILE_GUID = 05C48431-DE18-4550-931A-
> > 3350E8551498+ MODULE_TYPE = BASE+ VERSION_STRING
> > = 1.0+ LIBRARY_CLASS = RngLib+ CONSTRUCTOR
> > =
> > BaseRngLibConstructor++#+# VALID_ARCHITECTURES = IA32
> > X64+#++[Sources.Ia32, Sources.X64]+ BaseRng.c++[Packages]+
> > MdePkg/MdePkg.dec++[LibraryClasses]+ BaseLib+ DebugLibdiff --git
> > a/UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.uni
> > b/UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.uni
> > new file mode 100644
> > index 0000000000..f3ed954c52
> > --- /dev/null
> > +++ b/UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.uni
> > @@ -0,0 +1,17 @@
> > +// /** @file+// Instance of RNG (Random Number Generator) Library.+//+//
> > BaseRng Library that uses CPU RdRand instruction access to provide+// high-
> > quality random numbers.+//+// Copyright (c) 2015, Intel Corporation. All
> > rights
> > reserved.<BR>+//+// SPDX-License-Identifier: BSD-2-Clause-Patent+//+//
> > **/+++#string STR_MODULE_ABSTRACT #language en-US "Instance of
> > RNG Library"++#string STR_MODULE_DESCRIPTION #language en-US
> > "BaseRng Library that uses CPU RdRand instruction access to provide high-
> > quality random numbers"+diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc
> > b/UefiPayloadPkg/UefiPayloadPkg.dsc
> > index ae62a9c4d6..78a475ea02 100644
> > --- a/UefiPayloadPkg/UefiPayloadPkg.dsc
> > +++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
> > @@ -494,6 +494,14 @@
> > !endif UefiPayloadPkg/GraphicsOutputDxe/GraphicsOutputDxe.inf + #+ #
> > Random Number Generator+ #+
> > SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf {+
> > <LibraryClasses>+
> > RngLib|UefiPayloadPkg/Library/BaseRngLib/BaseRngLib.inf+ }+
> > #-----------------
> > ------------- # Build the shell #------------------------------diff
> > --git
> > a/UefiPayloadPkg/UefiPayloadPkg.fdf b/UefiPayloadPkg/UefiPayloadPkg.fdf
> > index a97ace7395..57c06c8621 100644
> > --- a/UefiPayloadPkg/UefiPayloadPkg.fdf
> > +++ b/UefiPayloadPkg/UefiPayloadPkg.fdf
> > @@ -169,6 +169,10 @@ INF
> > MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBusDxe.inf
> > INF MdeModulePkg/Bus/Usb/UsbKbDxe/UsbKbDxe.inf INF
> > MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassStorageDxe.inf +#+#
> > Random Number Generator+#+INF
> > SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf # # Shell--
> > 2.26.2
>
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