1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_MEMTYPE_H
3 #define _ASM_X86_MEMTYPE_H
4 
5 #include <linux/types.h>
6 #include <asm/pgtable_types.h>
7 
8 extern bool pat_enabled(void);
9 extern void pat_disable(const char *reason);
10 extern void pat_init(void);
11 extern void init_cache_modes(void);
12 
13 extern int memtype_reserve(u64 start, u64 end,
14 		enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
15 extern int memtype_free(u64 start, u64 end);
16 
17 extern int memtype_kernel_map_sync(u64 base, unsigned long size,
18 		enum page_cache_mode pcm);
19 
20 extern int memtype_reserve_io(resource_size_t start, resource_size_t end,
21 			enum page_cache_mode *pcm);
22 
23 extern void memtype_free_io(resource_size_t start, resource_size_t end);
24 
25 extern bool pat_pfn_immune_to_uc_mtrr(unsigned long pfn);
26 
27 bool x86_has_pat_wp(void);
28 enum page_cache_mode pgprot2cachemode(pgprot_t pgprot);
29 
30 #endif /* _ASM_X86_MEMTYPE_H */
31