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 */ 66