/*
* Start kdump: create a LGR log entry, store status of all CPUs and
* branch to __do_machine_kdump.
*/
static noinline void __machine_kdump(void *image)
{
int this_cpu, cpu;
lgr_info_log();
/* Get status of the other CPUs */
this_cpu = smp_find_processor_id(stap());
for_each_online_cpu(cpu) {
if (cpu == this_cpu)
continue;
if (smp_store_status(cpu))
continue;
}
/* Store status of the boot CPU */
if (MACHINE_HAS_VX)
save_vx_regs((void *) &S390_lowcore.vector_save_area);
/*
* To create a good backchain for this CPU in the dump store_status
* is passed the address of a function. The address is saved into
* the PSW save area of the boot CPU and the function is invoked as
* a tail call of store_status. The backchain in the dump will look
* like this:
* restart_int_handler -> __machine_kexec -> __do_machine_kdump
* The call to store_status() will not return.
*/
store_status(__do_machine_kdump, image);
}
/*
* Initialize CPU ELF notes
*/
void setup_regs(void)
{
unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE;
int cpu, this_cpu;
this_cpu = smp_find_processor_id(stap());
add_elf_notes(this_cpu);
for_each_online_cpu(cpu) {
if (cpu == this_cpu)
continue;
if (smp_store_status(cpu))
continue;
add_elf_notes(cpu);
}
/* Copy dump CPU store status info to absolute zero */
memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
}
/*
* Initialize CPU ELF notes
*/
static void setup_regs(void)
{
unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE;
struct _lowcore *lc;
int cpu, this_cpu;
/* Get lowcore pointer from store status of this CPU (absolute zero) */
lc = (struct _lowcore *)(unsigned long)S390_lowcore.prefixreg_save_area;
this_cpu = smp_find_processor_id(stap());
add_elf_notes(this_cpu);
for_each_online_cpu(cpu) {
if (cpu == this_cpu)
continue;
if (smp_store_status(cpu))
continue;
add_elf_notes(cpu);
}
if (MACHINE_HAS_VX)
save_vx_regs_safe((void *) lc->vector_save_area_addr);
/* Copy dump CPU store status info to absolute zero */
memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
}
