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author | Jason M. Bills <jason.m.bills@linux.intel.com> | 2020-05-06 01:31:17 +0300 |
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committer | Jason M. Bills <jason.m.bills@linux.intel.com> | 2020-05-14 21:54:34 +0300 |
commit | eda2c7c523d858d25fe25052254a7f393767310b (patch) | |
tree | 7c14ec3de42b7fc6c86bc3b0f9ecb4b9f21a5d14 /meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0015-Rewrite-memmove-to-optimize-on-word-transfers.patch | |
parent | 794d26fa53ad7e8cb54a3a5773436b1d8e813f35 (diff) | |
download | openbmc-eda2c7c523d858d25fe25052254a7f393767310b.tar.xz |
Update to internal 0.53
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
Diffstat (limited to 'meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0015-Rewrite-memmove-to-optimize-on-word-transfers.patch')
-rw-r--r-- | meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0015-Rewrite-memmove-to-optimize-on-word-transfers.patch | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0015-Rewrite-memmove-to-optimize-on-word-transfers.patch b/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0015-Rewrite-memmove-to-optimize-on-word-transfers.patch new file mode 100644 index 000000000..d93d9c4a1 --- /dev/null +++ b/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0015-Rewrite-memmove-to-optimize-on-word-transfers.patch @@ -0,0 +1,112 @@ +From 711c7bc5a07b62e8369bc76a9db265c960bacef8 Mon Sep 17 00:00:00 2001 +From: Vernon Mauery <vernon.mauery@linux.intel.com> +Date: Mon, 19 Nov 2018 11:04:02 -0800 +Subject: [PATCH] Rewrite memmove to optimize on word transfers + +Reading from the flash at boot time was using byte-sized transfers, +which ultimately turns into four word transfers over spi for every real +word read. This change breaks memmove down into a header, body, and +trailer, where the body is all done with word-sized transfers. + +Change-Id: Ie0a1f3261e507fb34a908571883d9bf04a1059ee +Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com> + +--- + lib/string.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++---------- + 1 file changed, 64 insertions(+), 13 deletions(-) + +diff --git a/lib/string.c b/lib/string.c +index 67d5f6a..0bf472f 100644 +--- a/lib/string.c ++++ b/lib/string.c +@@ -505,26 +505,77 @@ void * memcpy(void *dest, const void *src, size_t count) + * + * Unlike memcpy(), memmove() copes with overlapping areas. + */ +-void * memmove(void * dest,const void *src,size_t count) ++void *memmove(void *dest, const void *src, size_t count) + { +- char *tmp, *s; +- +- if (src == dest) ++ unsigned char *bdst = (unsigned char *)dest; ++ const unsigned char *bsrc = (const unsigned char *)src; ++ unsigned long *ldst; ++ const unsigned long *lsrc; ++ size_t unaligned_header = 0, unaligned_trailer = 0; ++ size_t unaligned_src = ++ (sizeof(*ldst) - (size_t)src) & (sizeof(*ldst) - 1); ++ size_t unaligned_dst = ++ (sizeof(*ldst) - (size_t)dest) & (sizeof(*ldst) - 1); ++ ++ if (src == dest || !count) + return dest; + ++ if (unaligned_src || unaligned_dst) { ++ if (unaligned_dst != unaligned_src) { ++ unaligned_header = count; ++ } else { ++ unaligned_header = unaligned_src; ++ if (unaligned_header > count) { ++ unaligned_header = count; ++ } ++ } ++ count -= unaligned_header; ++ } ++ if (count & (sizeof(*ldst) - 1)) { ++ unaligned_trailer = count & (sizeof(*ldst) - 1); ++ count -= unaligned_trailer; ++ } ++ + if (dest <= src) { +- tmp = (char *) dest; +- s = (char *) src; +- while (count--) +- *tmp++ = *s++; ++ /* possible un-aligned bytes */ ++ while (unaligned_header--) ++ *bdst++ = *bsrc++; ++ ++ /* aligned words */ ++ ldst = (unsigned long *)bdst; ++ lsrc = (const unsigned long *)bsrc; ++ while (count >= sizeof(*ldst)) { ++ count -= sizeof(*ldst); ++ *ldst++ = *lsrc++; + } +- else { +- tmp = (char *) dest + count; +- s = (char *) src + count; +- while (count--) +- *--tmp = *--s; ++ ++ /* possibly un-aligned bytes */ ++ bdst = (unsigned char *)ldst; ++ bsrc = (const unsigned char *)lsrc; ++ while (unaligned_trailer--) ++ *bdst++ = *bsrc++; ++ } else { ++ bdst += unaligned_header + count + unaligned_trailer; ++ bsrc += unaligned_header + count + unaligned_trailer; ++ ++ /* possibly un-aligned bytes */ ++ while (unaligned_trailer--) ++ *--bdst = *--bsrc; ++ ++ /* aligned words */ ++ ldst = (unsigned long *)bdst; ++ lsrc = (unsigned long *)bsrc; ++ while (count >= sizeof(*ldst)) { ++ count -= sizeof(*ldst); ++ *--ldst = *--lsrc; + } + ++ /* possibly un-aligned bytes */ ++ bdst = (unsigned char *)ldst; ++ bsrc = (const unsigned char *)lsrc; ++ while (unaligned_header--) ++ *--bdst = *--bsrc; ++ } + return dest; + } + #endif |