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arch/x86: add functions to generate random numbers

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Using x86 RDRAND instruction, two functions are supplied to
generate a 32bit or 64bit number.

One potential usage is the sealing key generation for SGX.

BUG=chrome-os-partner:62438
BRANCH=NONE
TEST=Tested on Eve to generate a 64bit random number.

Change-Id: I50cbeda4de17ccf2fc5efc1fe04f6b1a31ec268c
Signed-off-by: Robbie Zhang <robbie.zhang@intel.com>
Reviewed-on: https://review.coreboot.org/18362
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Robbie Zhang
2017-02-13 13:44:14 -08:00
committed by Martin Roth
parent f296ce91b9
commit 18792314d7
3 changed files with 111 additions and 0 deletions
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src/arch/x86/Makefile.inc
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@@ -334,6 +334,7 @@ ramstage-$(CONFIG_GENERATE_MP_TABLE) += mpspec.c
ramstage-y += pci_ops_conf1.c
ramstage-$(CONFIG_MMCONF_SUPPORT) += pci_ops_mmconf.c
ramstage-$(CONFIG_GENERATE_PIRQ_TABLE) += pirq_routing.c
ramstage-y += rdrand.c
ramstage-$(CONFIG_GENERATE_SMBIOS_TABLES) += smbios.c
ramstage-y += tables.c
ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c