arch/x86/include/asm/pat.h

   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
   8 bool pat_enabled(void);
   9 void pat_disable(const char *reason);
  10 extern void pat_init(void);
  11 extern void init_cache_modes(void);
  12
  13 extern int reserve_memtype(u64 start, u64 end,
  14                 enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
  15 extern int free_memtype(u64 start, u64 end);
  16
  17 extern int kernel_map_sync_memtype(u64 base, unsigned long size,
  18                 enum page_cache_mode pcm);
  19
  20 int io_reserve_memtype(resource_size_t start, resource_size_t end,
  21                         enum page_cache_mode *pcm);
  22
  23 void io_free_memtype(resource_size_t start, resource_size_t end);
  24
  25 bool pat_pfn_immune_to_uc_mtrr(unsigned long pfn);
  26
  27 #endif /* _ASM_X86_PAT_H */