arch/x86: add functions to generate random numbers
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>
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index c4bb1cc..332e8ec 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -334,6 +334,7 @@
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