Impact: fix UV boot crash
This fixes a UV bug related to generating global memory addresses
on partitioned systems. Partition systems do not have physical memory
at address 0. Instead, a chunk of high memory is remapped by the chipset
so that it appears to be at address 0. This remapping is INVISIBLE to most
of the OS. The only OS functions that need to be aware of the remaping are
functions that directly interface to the chipset. The GRU is one example.
Also, delete a couple of unused macros related to global memory addresses.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Impact: include file dependency cleanup
Fix compile errors of files that include asm/uv/uv_hub.h but do
not include linux/timer.h.
[ such files are not mainline right now. ]
Signed-of-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Impact: cleanup
Change UV heartbeat function to use idle_cpu to determine cpu's
"idleness". Realign uv_hub definitions.
Signed-of-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Impact: start per CPU heartbeat LED timers on SGI UV systems
The SGI UV system has no LEDS but uses one of the system controller
regs to indicate the online internal state of the cpu. There is a
heartbeat bit indicating that the cpu is responding to interrupts,
and an idle bit indicating whether the cpu is idle when the heartbeat
interrupt occurs. The current period is one second.
When a cpu panics, an error code is written by BIOS to this same reg.
This patchset provides the following:
* x86_64: Add base functionality for writing to the specific SCIR's
for each cpu.
* heartbeat: Invert "heartbeat" bit to indicate the cpu is
"interruptible". If the current thread is the idle thread,
then indicate system is "idle".
* if hotplug enabled, all bits are set (0xff) when the cpu is disabled.
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Drop double underscores from header guards in arch/x86/include. They
are used inconsistently, and are not necessary.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Change header guards named "ASM_X86__*" to "_ASM_X86_*" since:
a. the double underscore is ugly and pointless.
b. no leading underscore violates namespace constraints.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Jack Steiner