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/******************************************************************************
* crash.c
*
* Based heavily on arch/i386/kernel/crash.c from Linux 2.6.16
*
* Xen port written by:
* - Simon 'Horms' Horman <horms@verge.net.au>
* - Magnus Damm <magnus@valinux.co.jp>
*/
#include <asm/atomic.h>
#include <asm/elf.h>
#include <asm/percpu.h>
#include <xen/types.h>
#include <xen/irq.h>
#include <asm/nmi.h>
#include <xen/string.h>
#include <xen/elf.h>
#include <xen/elfcore.h>
#include <xen/smp.h>
#include <xen/delay.h>
#include <xen/perfc.h>
#include <xen/kexec.h>
#include <xen/sched.h>
#include <public/xen.h>
#include <asm/shared.h>
#include <asm/hvm/support.h>
static atomic_t waiting_for_crash_ipi;
static unsigned int crashing_cpu;
static int crash_nmi_callback(struct cpu_user_regs *regs, int cpu)
{
/* Don't do anything if this handler is invoked on crashing cpu.
* Otherwise, system will completely hang. Crashing cpu can get
* an NMI if system was initially booted with nmi_watchdog parameter.
*/
if ( cpu == crashing_cpu )
return 1;
local_irq_disable();
kexec_crash_save_cpu();
__stop_this_cpu();
atomic_dec(&waiting_for_crash_ipi);
for ( ; ; )
halt();
return 1;
}
static void nmi_shootdown_cpus(void)
{
unsigned long msecs;
local_irq_disable();
crashing_cpu = smp_processor_id();
local_irq_count(crashing_cpu) = 0;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
/* Would it be better to replace the trap vector here? */
set_nmi_callback(crash_nmi_callback);
/* Ensure the new callback function is set before sending out the NMI. */
wmb();
smp_send_nmi_allbutself();
msecs = 1000; /* Wait at most a second for the other cpus to stop */
while ( (atomic_read(&waiting_for_crash_ipi) > 0) && msecs )
{
mdelay(1);
msecs--;
}
__stop_this_cpu();
disable_IO_APIC();
local_irq_enable();
}
void machine_crash_shutdown(void)
{
crash_xen_info_t *info;
nmi_shootdown_cpus();
info = kexec_crash_save_info();
info->xen_phys_start = xen_phys_start;
info->dom0_pfn_to_mfn_frame_list_list =
arch_get_pfn_to_mfn_frame_list_list(dom0);
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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