include/asm/memtype.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_X86_MEMTYPE_H
0003 #define _ASM_X86_MEMTYPE_H
0004
0005 #include <linux/types.h>
0006 #include <asm/pgtable_types.h>
0007
0008 extern bool pat_enabled(void);
0009 extern void pat_disable(const char *reason);
0010 extern void pat_init(void);
0011 extern void init_cache_modes(void);
0012
0013 extern int memtype_reserve(u64 start, u64 end,
0014         enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
0015 extern int memtype_free(u64 start, u64 end);
0016
0017 extern int memtype_kernel_map_sync(u64 base, unsigned long size,
0018         enum page_cache_mode pcm);
0019
0020 extern int memtype_reserve_io(resource_size_t start, resource_size_t end,
0021             enum page_cache_mode *pcm);
0022
0023 extern void memtype_free_io(resource_size_t start, resource_size_t end);
0024
0025 extern bool pat_pfn_immune_to_uc_mtrr(unsigned long pfn);
0026
0027 bool x86_has_pat_wp(void);
0028 enum page_cache_mode pgprot2cachemode(pgprot_t pgprot);
0029
0030 #endif /* _ASM_X86_MEMTYPE_H */