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| author | Jan Beulich <jbeulich@suse.com> | 2012-03-27 15:20:23 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2012-03-27 15:20:23 +0200 |
| commit | a5e1cb8704755905940c7242f62c5e9d85957d65 (patch) | |
| tree | ef6acb5116ec3970c3cce65c682b62a0a02d310f /xen/include/asm-x86/hpet.h | |
| parent | 7db78449277c45354166ea31bf7c262daea3d8ee (diff) | |
| download | xen-a5e1cb8704755905940c7242f62c5e9d85957d65.tar.gz xen-a5e1cb8704755905940c7242f62c5e9d85957d65.tar.bz2 xen-a5e1cb8704755905940c7242f62c5e9d85957d65.zip | |
x86/hpet: disable before reboot or kexec
Linux up to now is not smart enough to properly clear the HPET when it
boots, which is particularly a problem when a kdump attempt from
running under Xen is being made. Linux itself added code to work around
this to its shutdown paths quite some time ago, so let's do something
similar in Xen: Save the configuration register settings during boot,
and restore them during shutdown. This should cover the majority of
cases where the secondary kernel might not come up because timer
interrupts don't work.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/include/asm-x86/hpet.h')
| -rw-r--r-- | xen/include/asm-x86/hpet.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/xen/include/asm-x86/hpet.h b/xen/include/asm-x86/hpet.h index fe9f9b6ded..bb2c4b4af8 100644 --- a/xen/include/asm-x86/hpet.h +++ b/xen/include/asm-x86/hpet.h @@ -55,7 +55,12 @@ extern unsigned long hpet_address; * Return value is zero if HPET is unavailable. */ u64 hpet_setup(void); -void hpet_resume(void); +void hpet_resume(u32 *); + +/* + * Disable HPET hardware: restore it to boot time state. + */ +void hpet_disable(void); /* * Callback from legacy timer (PIT channel 0) IRQ handler. |