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authorGraeme Russ <graeme.russ@gmail.com>2010-10-07 20:03:33 +1100
committerGraeme Russ <graeme.russ@gmail.com>2010-10-07 20:03:33 +1100
commitf2ff75c0a25eb78b4b86fd96c5f0be9dd327e2d7 (patch)
tree8b10cec22c7b082d2d4ed6e7d18cf93ec81a7136 /arch/i386
parent221914265860a47a0ba8bfa6956097cb045d9b39 (diff)
downloadu-boot-linaro-stable-f2ff75c0a25eb78b4b86fd96c5f0be9dd327e2d7.tar.gz
x86: Use loops instead of memcpy/memset in board_init_f
Provides a small speed increase and prepares for fully relocatable image. Downside is the TEXT_BASE, bss, load address etc must ALL be aligned on a a 4-byte boundary which is not such a terrible restriction as everything is already 4-byte aligned anyway
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/lib/board.c47
1 files changed, 31 insertions, 16 deletions
diff --git a/arch/i386/lib/board.c b/arch/i386/lib/board.c
index 3e89ef428..9c2f77fd5 100644
--- a/arch/i386/lib/board.c
+++ b/arch/i386/lib/board.c
@@ -53,7 +53,7 @@ extern ulong __data_end;
extern ulong __rel_dyn_start;
extern ulong __rel_dyn_end;
extern ulong __bss_start;
-extern ulong __bss_size;
+extern ulong __bss_end;
const char version_string[] =
U_BOOT_VERSION" (" U_BOOT_DATE " - " U_BOOT_TIME ")";
@@ -172,18 +172,22 @@ void board_init_f (ulong gdp)
{
void *text_start = &__text_start;
void *data_end = &__data_end;
- Elf32_Rel *rel_dyn_start = (Elf32_Rel *)&__rel_dyn_start;
- Elf32_Rel *rel_dyn_end = (Elf32_Rel *)&__rel_dyn_end;
+ void *rel_dyn_start = &__rel_dyn_start;
+ void *rel_dyn_end = &__rel_dyn_end;
void *bss_start = &__bss_start;
- ulong bss_size = (ulong)&__bss_size;
+ void *bss_end = &__bss_end;
+
+ ulong *dst_addr;
+ ulong *src_addr;
+ ulong *end_addr;
- ulong uboot_size;
void *dest_addr;
ulong rel_offset;
- Elf32_Rel *re;
+ Elf32_Rel *re_src;
+ Elf32_Rel *re_end;
- uboot_size = (ulong)data_end - (ulong)text_start;
- dest_addr = (void *)gdp - (uboot_size + (ulong)bss_size);
+ /* Calculate destination RAM Address and relocation offset */
+ dest_addr = (void *)gdp - (bss_end - text_start);
rel_offset = text_start - dest_addr;
/* First stage CPU initialization */
@@ -195,18 +199,29 @@ void board_init_f (ulong gdp)
hang();
/* Copy U-Boot into RAM */
- memcpy(dest_addr, text_start, uboot_size);
+ dst_addr = (ulong *)dest_addr;
+ src_addr = (ulong *)text_start;
+ end_addr = (ulong *)data_end;
+
+ while (src_addr < end_addr)
+ *dst_addr++ = *src_addr++;
/* Clear BSS */
- memset(bss_start - rel_offset, 0, bss_size);
+ dst_addr = (ulong *)(bss_start - rel_offset);
+ end_addr = (ulong *)(bss_end - rel_offset);
+
+ while (dst_addr < end_addr)
+ *dst_addr++ = 0x00000000;
/* Perform relocation adjustments */
- for (re = rel_dyn_start; re < rel_dyn_end; re++)
- {
- if (re->r_offset >= TEXT_BASE)
- if (*(ulong *)re->r_offset >= TEXT_BASE)
- *(ulong *)(re->r_offset - rel_offset) -= (Elf32_Addr)rel_offset;
- }
+ re_src = (Elf32_Rel *)rel_dyn_start;
+ re_end = (Elf32_Rel *)rel_dyn_end;
+
+ do {
+ if (re_src->r_offset >= TEXT_BASE)
+ if (*(Elf32_Addr *)(re_src->r_offset - rel_offset) >= TEXT_BASE)
+ *(Elf32_Addr *)(re_src->r_offset - rel_offset) -= rel_offset;
+ } while (re_src++ < re_end);
((gd_t *)gdp)->reloc_off = rel_offset;
((gd_t *)gdp)->flags |= GD_FLG_RELOC;