mirror of https://github.com/acidanthera/audk.git
c75c640512
Calculate the frequency of the APIC timer that Xen provides. Even though the frequency is currently hard-coded, it isn't part of the public ABI that Xen provides and thus may change at any time. OVMF needs to determine the frequency by an other mean. Fortunately, Xen provides a way to determines the frequency of the TSC, so we can use TSC to calibrate the frequency of the APIC timer. That information is found in the shared_info page which we map and unmap once done (XenBusDxe is going to map the page somewhere else). The shared_info page is mapped at the highest physical address allowed as it doesn't need to be in the RAM, thus there's a call to update the page table. The calculated frequency is only logged in this patch, it will be used in a following patch. Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2490 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20210412133003.146438-7-anthony.perard@citrix.com> |
||
|---|---|---|
| .. | ||
| AmdSev.c | ||
| ClearCache.c | ||
| Cmos.c | ||
| Cmos.h | ||
| Fv.c | ||
| MemDetect.c | ||
| Platform.c | ||
| Platform.h | ||
| Xen.c | ||
| Xen.h | ||
| XenPlatformPei.inf | ||