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 extern unsigned long page_offset_base;
  15 extern unsigned long vmalloc_base;
  16 extern unsigned long vmemmap_base;
  17
  18 static inline unsigned long __phys_addr_nodebug(unsigned long x)
  19 {
  20         unsigned long y = x - __START_KERNEL_map;
  21
  22         /* use the carry flag to determine if x was < __START_KERNEL_map */
  23         x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
  24
  25         return x;
  26 }
  27
  28 #ifdef CONFIG_DEBUG_VIRTUAL
  29 extern unsigned long __phys_addr(unsigned long);
  30 extern unsigned long __phys_addr_symbol(unsigned long);
  31 #else
  32 #define __phys_addr(x)          __phys_addr_nodebug(x)
  33 #define __phys_addr_symbol(x) \
  34         ((unsigned long)(x) - __START_KERNEL_map + phys_base)
  35 #endif
  36
  37 #define __phys_reloc_hide(x)    (x)
  38
  39 #ifdef CONFIG_FLATMEM
  40 #define pfn_valid(pfn)          ((pfn) < max_pfn)
  41 #endif
  42
  43 void clear_page_orig(void *page);
  44 void clear_page_rep(void *page);
  45 void clear_page_erms(void *page);
  46
  47 static inline void clear_page(void *page)
  48 {
  49         alternative_call_2(clear_page_orig,
  50                            clear_page_rep, X86_FEATURE_REP_GOOD,
  51                            clear_page_erms, X86_FEATURE_ERMS,
  52                            "=D" (page),
  53                            "0" (page)
  54                            : "cc", "memory", "rax", "rcx");
  55 }
  56
  57 void copy_page(void *to, void *from);
  58
  59 #endif  /* !__ASSEMBLY__ */
  60
  61 #ifdef CONFIG_X86_VSYSCALL_EMULATION
  62 # define __HAVE_ARCH_GATE_AREA 1
  63 #endif
  64
  65 #endif /* _ASM_X86_PAGE_64_H */