53 lines
728 B
Diff
53 lines
728 B
Diff
diff --git a/kvm/bios/rombios.c b/kvm/bios/rombios.c
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index c4f6ccd..c4bfe60 100644
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--- a/kvm/bios/rombios.c
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+++ b/kvm/bios/rombios.c
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@@ -10196,22 +10196,43 @@ no_serial:
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ret
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rom_checksum:
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- push ax
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- push bx
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- push cx
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+ pusha
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+ push ds
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+
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xor ax, ax
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xor bx, bx
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xor cx, cx
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+ xor dx, dx
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+
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mov ch, [2]
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shl cx, #1
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+
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+ jnc checksum_loop
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+ xchg dx, cx
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+ dec cx
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+
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checksum_loop:
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add al, [bx]
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inc bx
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loop checksum_loop
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+
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+ test dx, dx
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+ je checksum_out
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+
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+ add al, [bx]
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+ mov cx, dx
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+ mov dx, ds
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+ add dh, #0x10
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+ mov ds, dx
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+ xor dx, dx
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+ xor bx, bx
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+
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+ jmp checksum_loop
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+
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+checksum_out:
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and al, #0xff
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- pop cx
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- pop bx
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- pop ax
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+ pop ds
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+ popa
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ret
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