path: root/arch/x86/oprofile
diff options
authorRobert Richter <robert.richter@amd.com>2010-10-06 12:27:53 +0200
committerIngo Molnar <mingo@elte.hu>2010-10-20 04:42:13 +0200
commita68c439b1966c91f0ef474e2bf275d6792312726 (patch)
tree9a49f060ee7d20a23fa8d3990e7f733aef60b15c /arch/x86/oprofile
parent14d4962dc863ab42e898d66d4837aa6c3afedc3b (diff)
apic, x86: Check if EILVT APIC registers are available (AMD only)
This patch implements checks for the availability of LVT entries (APIC500-530) and reserves it if used. The check becomes necessary since we want to let the BIOS provide the LVT offsets. The offsets should be determined by the subsystems using it like those for MCE threshold or IBS. On K8 only offset 0 (APIC500) and MCE interrupts are supported. Beginning with family 10h at least 4 offsets are available. Since offsets must be consistent for all cores, we keep track of the LVT offsets in software and reserve the offset for the same vector also to be used on other cores. An offset is freed by setting the entry to APIC_EILVT_MASKED. If the BIOS is right, there should be no conflicts. Otherwise a "[Firmware Bug]: ..." error message is generated. However, if software does not properly determines the offsets, it is not necessarily a BIOS bug. Signed-off-by: Robert Richter <robert.richter@amd.com> LKML-Reference: <1286360874-1471-2-git-send-email-robert.richter@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/oprofile')
0 files changed, 0 insertions, 0 deletions