arch/x86/include/asm/page_64.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PAGE_64_H
   3 #define _ASM_X86_PAGE_64_H
   4
   5 #include <asm/page_64_types.h>
   6
   7 #ifndef __ASSEMBLY__
   8 #include <asm/alternative.h>
   9
  10 /* duplicated to the one in bootmem.h */
  11 extern unsigned long max_pfn;
  12 extern unsigned long phys_base;
  13
  14 static inline unsigned long __phys_addr_nodebug(unsigned long x)
  15 {
  16         unsigned long y = x - __START_KERNEL_map;
  17
  18         /* use the carry flag to determine if x was < __START_KERNEL_map */
  19         x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
  20
  21         return x;
  22 }
  23
  24 #ifdef CONFIG_DEBUG_VIRTUAL
  25 extern unsigned long __phys_addr(unsigned long);
  26 extern unsigned long __phys_addr_symbol(unsigned long);
  27 #else
  28 #define __phys_addr(x)          __phys_addr_nodebug(x)
  29 #define __phys_addr_symbol(x) \
  30         ((unsigned long)(x) - __START_KERNEL_map + phys_base)
  31 #endif
  32
  33 #define __phys_reloc_hide(x)    (x)
  34
  35 #ifdef CONFIG_FLATMEM
  36 #define pfn_valid(pfn)          ((pfn) < max_pfn)
  37 #endif
  38
  39 void clear_page_orig(void *page);
  40 void clear_page_rep(void *page);
  41 void clear_page_erms(void *page);
  42
  43 static inline void clear_page(void *page)
  44 {
  45         alternative_call_2(clear_page_orig,
  46                            clear_page_rep, X86_FEATURE_REP_GOOD,
  47                            clear_page_erms, X86_FEATURE_ERMS,
  48                            "=D" (page),
  49                            "0" (page)
  50                            : "memory", "rax", "rcx");
  51 }
  52
  53 void copy_page(void *to, void *from);
  54
  55 #endif  /* !__ASSEMBLY__ */
  56
  57 #ifdef CONFIG_X86_VSYSCALL_EMULATION
  58 # define __HAVE_ARCH_GATE_AREA 1
  59 #endif
  60
  61 #endif /* _ASM_X86_PAGE_64_H */