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 */ 62