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arch/x86_64: replaced loop construct with rep movsb

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Replaces inefficient loop construct with rep movsb string instruction.

Signed-off-by: cqb <cqb@sideways.engineering>
This commit is contained in:
cqb
2026-02-01 17:46:28 +01:00
committed by Xiang Xiao
parent 3fb776e45c
commit 7b1e9eb8bc
1 changed files with 2 additions and 8 deletions
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arch/x86_64/src/common/multiboot1.S
+2 -8
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@@ -54,15 +54,9 @@ _start:
movl $realmode_start, %esi movl $realmode_start, %esi
movl $0, %edi movl $0, %edi
copy_loop:
/* Copy by bytes, make sure the addresses are not overlapped */ /* Copy by bytes, make sure the addresses are not overlapped */
cld
movb (%esi), %al rep movsb
movb %al, (%edi)
inc %esi
inc %edi
loop copy_loop
/* Jump to bin_start + 0x30, skip the multiboot1 header */ /* Jump to bin_start + 0x30, skip the multiboot1 header */