[Xen-changelog] [xen master] x86: honor ACPI indicating absence of CMOS RTC

[patchbot@xxxxxxx]

commit f74556693bca2ff61e3e0c103f90e1d552d795b6
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Feb 22 11:51:06 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Feb 22 11:51:06 2013 +0100

    x86: honor ACPI indicating absence of CMOS RTC
    
    On such systems we can boot through EFI only.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Keir Fraser <keir@xxxxxxx>
---
 xen/arch/x86/time.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 244b43e..56bffdb 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -754,6 +754,9 @@ static unsigned long get_cmos_time(void)
             return res;
     }
 
+    if ( unlikely(acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) )
+        panic("System without CMOS RTC must be booted from EFI\n");
+
     spin_lock_irqsave(&rtc_lock, flags);
 
     /* read RTC exactly on falling edge of update flag */
--
generated by git-patchbot for /home/xen/git/xen.git#master

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