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// 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 */
}
}
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