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| author | H. Peter Anvin <hpa@zytor.com> | 2009-04-27 13:48:24 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-04-27 13:48:24 -0700 |
| commit | 071394c8fe611d6c75338d80dfafc76264599096 (patch) | |
| tree | 7c6b2e4d85d348ffd1ef75a3f0055e988a8404d0 | |
| parent | 6c0fb9ea3e8ac6ecf7c9fe3f8708999c0031e9b6 (diff) | |
| download | syslinux-071394c8fe611d6c75338d80dfafc76264599096.tar.gz | |
bcopyxx: align the relocated code to a 16-byte boundary
Align the relocated bcopyxx code to a 16-byte boundary. There are
CPUs which have errata relating to GDTs which are not 16-byte aligned.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | core/bcopyxx.inc | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/core/bcopyxx.inc b/core/bcopyxx.inc index b237b005..06b03b2a 100644 --- a/core/bcopyxx.inc +++ b/core/bcopyxx.inc @@ -205,7 +205,8 @@ pm_bcopy: ; pm_shuffle: mov ebx,edi ; EBX <- descriptor list - lea edx,[edi+ecx] ; EDX <- shuffler end location + lea edx,[edi+ecx+15] ; EDX <- where to relocate our code to + and edx,~15 ; Align 16 to benefit the GDT call pm_bcopy mov edi,edx mov esi,bcopyxx_start @@ -299,7 +300,8 @@ bcopyxx_len equ $-bcopyxx_start bcopyxx_dwords equ bcopyxx_len >> 2 bcopyxx_stack equ 128 ; We want this much stack -bcopyxx_safe equ bcopyxx_len + bcopyxx_stack + ; The +15 is for alignment +bcopyxx_safe equ bcopyxx_len + bcopyxx_stack + 15 ; ; Space for a dummy task state segment. It should never be actually |