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
__phys_addr_nodebug(unsigned long x)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
clear_page(void * page)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 */
66