// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Shadow Call Stack support.
|
*
|
* Copyright (C) 2019 Google LLC
|
*/
|
|
#include <linux/percpu.h>
|
#include <linux/vmalloc.h>
|
#include <asm/pgtable.h>
|
#include <asm/scs.h>
|
|
DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
|
|
#ifndef CONFIG_SHADOW_CALL_STACK_VMAP
|
DEFINE_PER_CPU(unsigned long [SCS_SIZE/sizeof(long)], irq_shadow_call_stack)
|
__aligned(SCS_SIZE);
|
#endif
|
|
void scs_init_irq(void)
|
{
|
int cpu;
|
|
for_each_possible_cpu(cpu) {
|
#ifdef CONFIG_SHADOW_CALL_STACK_VMAP
|
unsigned long *p;
|
|
p = __vmalloc_node_range(PAGE_SIZE, SCS_SIZE,
|
VMALLOC_START, VMALLOC_END,
|
GFP_SCS, PAGE_KERNEL,
|
0, cpu_to_node(cpu),
|
__builtin_return_address(0));
|
|
per_cpu(irq_shadow_call_stack_ptr, cpu) = p;
|
#else
|
per_cpu(irq_shadow_call_stack_ptr, cpu) =
|
per_cpu(irq_shadow_call_stack, cpu);
|
#endif /* CONFIG_SHADOW_CALL_STACK_VMAP */
|
}
|
}
|
