/*
* One-time initialisation.
*/
static int __init arch_hw_breakpoint_init(void)
{
core_num_brps = get_num_brps();
core_num_wrps = get_num_wrps();
pr_info("found %d breakpoint and %d watchpoint registers.\n",
core_num_brps, core_num_wrps);
cpu_notifier_register_begin();
/*
* Reset the breakpoint resources. We assume that a halting
* debugger will leave the world in a nice state for us.
*/
smp_call_function(hw_breakpoint_reset, NULL, 1);
hw_breakpoint_reset(NULL);
/* Register debug fault handlers. */
hook_debug_fault_code(DBG_ESR_EVT_HWBP, breakpoint_handler, SIGTRAP,
TRAP_HWBKPT, "hw-breakpoint handler");
hook_debug_fault_code(DBG_ESR_EVT_HWWP, watchpoint_handler, SIGTRAP,
TRAP_HWBKPT, "hw-watchpoint handler");
/* Register hotplug notifier. */
__register_cpu_notifier(&hw_breakpoint_reset_nb);
cpu_notifier_register_done();
/* Register cpu_suspend hw breakpoint restore hook */
cpu_suspend_set_dbg_restorer(hw_breakpoint_reset);
return 0;
}
static int hw_breakpoint_cpu_pm_notify(struct notifier_block *self,
unsigned long action,
void *v)
{
if (action == CPU_PM_EXIT) {
hw_breakpoint_reset(NULL);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
