diff options
Diffstat (limited to 'meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0028-Improve-randomness-of-mac-address-generation.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0028-Improve-randomness-of-mac-address-generation.patch | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0028-Improve-randomness-of-mac-address-generation.patch b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0028-Improve-randomness-of-mac-address-generation.patch new file mode 100644 index 000000000..337e9995b --- /dev/null +++ b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0028-Improve-randomness-of-mac-address-generation.patch @@ -0,0 +1,53 @@ +From da155e990fe763d3a03bdac76054e1d5530b8c16 Mon Sep 17 00:00:00 2001 +From: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +Date: Wed, 10 Mar 2021 20:15:10 -0800 +Subject: [PATCH] Improve randomness of mac address generation + +This commit improves randomness of mac address generation using +AST2600's hardware random number generator. + +Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> +--- + lib/rand.c | 16 ++++++++++++++++ + 1 file changed, 16 insertions(+) + +diff --git a/lib/rand.c b/lib/rand.c +index af4cf3a0e8cf..0a12b0b82276 100644 +--- a/lib/rand.c ++++ b/lib/rand.c +@@ -8,16 +8,32 @@ + */ + + #include <common.h> ++#include <asm/io.h> + + static unsigned int y = 1U; + + unsigned int rand_r(unsigned int *seedp) + { ++#ifdef CONFIG_ASPEED_AST2600 ++#define SCU_524 0x1e6e2524 ++ int i; ++ ++ /* ++ * Use hardware random number generator. It generates a new number on ++ * each 1us or on each 32 read command cycle so this code makes ++ * intentional dummy 32 reads. ++ */ ++ for (i = 0; i < 32; i++) ++ *seedp ^= readl(SCU_524); ++ ++ return readl(SCU_524); ++#else + *seedp ^= (*seedp << 13); + *seedp ^= (*seedp >> 17); + *seedp ^= (*seedp << 5); + + return *seedp; ++#endif + } + + unsigned int rand(void) +-- +2.17.1 + |