1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PAT_H
3#define _ASM_X86_PAT_H
4
5#include <linux/types.h>
6#include <asm/pgtable_types.h>
7
8bool pat_enabled(void);
9void pat_disable(const char *reason);
10extern void pat_init(void);
11extern void init_cache_modes(void);
12
13extern int reserve_memtype(u64 start, u64 end,
14 enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
15extern int free_memtype(u64 start, u64 end);
16
17extern int kernel_map_sync_memtype(u64 base, unsigned long size,
18 enum page_cache_mode pcm);
19
20int io_reserve_memtype(resource_size_t start, resource_size_t end,
21 enum page_cache_mode *pcm);
22
23void io_free_memtype(resource_size_t start, resource_size_t end);
24
25bool pat_pfn_immune_to_uc_mtrr(unsigned long pfn);
26
27#endif /* _ASM_X86_PAT_H */
28