diff options
| author | Luca Tettamanti <kronos.it@gmail.com> | 2011-05-25 20:43:31 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-06-23 15:24:04 -0700 |
| commit | c8b6153da29826fb498c452a185e96322fdc4946 (patch) | |
| tree | 82819f74a1a15b4c0f4001f37235459e38c50013 /drivers | |
| parent | b5914dec1c8ae26f4d540b40a7f8c7ea4f76fc45 (diff) | |
i8k: Avoid lahf in 64-bit code
commit bc1f419c76a2d6450413ce4349f4e4a07be011d5 upstream.
i8k uses lahf to read the flag register in 64-bit code; early x86-64
CPUs, however, lack this instruction and we get an invalid opcode
exception at runtime.
Use pushf to load the flag register into the stack instead.
Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
Reported-by: Jeff Rickman <jrickman@myamigos.us>
Tested-by: Jeff Rickman <jrickman@myamigos.us>
Tested-by: Harry G McGavran Jr <w5pny@arrl.net>
Cc: Massimo Dal Zotto <dz@debian.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/i8k.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c index 4365717161c..1e116ace13b 100644 --- a/drivers/char/i8k.c +++ b/drivers/char/i8k.c @@ -138,8 +138,8 @@ static int i8k_smm(struct smm_regs *regs) "movl %%edi,20(%%rax)\n\t" "popq %%rdx\n\t" "movl %%edx,0(%%rax)\n\t" - "lahf\n\t" - "shrl $8,%%eax\n\t" + "pushfq\n\t" + "popq %%rax\n\t" "andl $1,%%eax\n" :"=a"(rc) : "a"(regs) |