[U-Boot] [RFC 02/14] x86: Speed up copy-to-RAM and clear BSS operations

Graeme Russ
2011-12-23T12:25:39Z

The implementations of memcpy and memset are now the optimised versions
from glibc, so use them instead of simple copy loops
---
arch/x86/lib/board.c | 17 +++++------------
1 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/arch/x86/lib/board.c b/arch/x86/lib/board.c
index d742fec..ba6b59f 100644
--- a/arch/x86/lib/board.c
+++ b/arch/x86/lib/board.c
@@ -188,26 +188,19 @@ static int calculate_relocation_address(void)

static int copy_uboot_to_ram(void)
{
- ulong *dst_addr = (ulong *)gd->relocaddr;
- ulong *src_addr = (ulong *)&__text_start;
- ulong *end_addr = (ulong *)&__data_end;
+ size_t len = (size_t)(&__data_end) - (size_t)(&__text_start);

- while (src_addr < end_addr)
- *dst_addr++ = *src_addr++;
+ memcpy((void *)gd->relocaddr, (void *)&__text_start, len);

return 0;
}

static int clear_bss(void)
{
- void *bss_start = &__bss_start;
- void *bss_end = &__bss_end;
+ ulong dst_addr = (ulong)(&__bss_start) + gd->reloc_off;
+ size_t len = (size_t)(&__bss_end) - (size_t)(&__bss_start);

- ulong *dst_addr = (ulong *)(bss_start + gd->reloc_off);
- ulong *end_addr = (ulong *)(bss_end + gd->reloc_off);
-
- while (dst_addr < end_addr)
- *dst_addr++ = 0x00000000;
+ memset((void *)dst_addr, 0x00, len);

return 0;
}
--
1.7.5.2.317.g391b14