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| author | John Baldwin <jhb@FreeBSD.org> | 2004-02-03 22:00:42 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2004-02-03 22:00:42 +0000 |
| commit | 7a9d7023a212cc15b5c2add18ecf518a135c56d5 (patch) | |
| tree | b9a6efd2fe16362b210ece58d105d4016f3e1d9b /sys/i386/isa | |
| parent | 908579c17277a6608589b9946077ed6683da3f91 (diff) | |
| download | src-7a9d7023a212cc15b5c2add18ecf518a135c56d5.tar.gz src-7a9d7023a212cc15b5c2add18ecf518a135c56d5.zip | |
Revert the skipping of segment register reloads as it appears to actually
be a pessimization on non Pentium4 CPUs. More importantly, it is buggy as
it can cause GPF's when using APM or vm86.
Notes
Notes:
svn path=/head/; revision=125405
Diffstat (limited to 'sys/i386/isa')
| -rw-r--r-- | sys/i386/isa/atpic_vector.s | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/sys/i386/isa/atpic_vector.s b/sys/i386/isa/atpic_vector.s index 4b819ce44688..e3dc38f6f383 100644 --- a/sys/i386/isa/atpic_vector.s +++ b/sys/i386/isa/atpic_vector.s @@ -63,15 +63,12 @@ IDTVEC(vec_name) ; \ pushl %ds ; /* save data and extra segments ... */ \ pushl %es ; \ pushl %fs ; \ - mov %fs,%ax ; /* get current per-cpu selector */ \ - cmp $KPSEL,%ax ; /* are we already in the kernel? */ \ - je 1f ; /* skip expensive segment reloads */ \ mov $KDSEL,%ax ; /* load kernel ds, es and fs */ \ mov %ax,%ds ; \ mov %ax,%es ; \ mov $KPSEL,%ax ; \ mov %ax,%fs ; \ -1: ; \ +; \ FAKE_MCOUNT(13*4(%esp)) ; /* XXX late to avoid double count */ \ pushl $irq_num; /* pass the IRQ */ \ call atpic_handle_intr ; \ |