1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * This file contains the routines for initializing kernel userspace protection
4 */
5
6#include <linux/export.h>
7#include <linux/init.h>
8#include <linux/printk.h>
9#include <linux/smp.h>
10
11#include <asm/kup.h>
12#include <asm/smp.h>
13
14#ifdef CONFIG_PPC_KUAP
15void setup_kuap(bool disabled)
16{
17	if (disabled) {
18		if (IS_ENABLED(CONFIG_40x))
19			disable_kuep = true;
20		if (smp_processor_id() == boot_cpuid)
21			cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP;
22		return;
23	}
24
25	pr_info("Activating Kernel Userspace Access Protection\n");
26
27	prevent_user_access(KUAP_READ_WRITE);
28}
29#endif
30