1#ifndef _ASM_X86_PAGE_64_H
 2#define _ASM_X86_PAGE_64_H
 3
 4#include <asm/page_64_types.h>
 5
 6#ifndef __ASSEMBLY__
 
 
 
 
 7
 8/* duplicated to the one in bootmem.h */
 9extern unsigned long max_pfn;
10extern unsigned long phys_base;
11
12static inline unsigned long __phys_addr_nodebug(unsigned long x)
 
 
 
 
13{
14	unsigned long y = x - __START_KERNEL_map;
15
16	/* use the carry flag to determine if x was < __START_KERNEL_map */
17	x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
18
19	return x;
20}
21
22#ifdef CONFIG_DEBUG_VIRTUAL
23extern unsigned long __phys_addr(unsigned long);
24extern unsigned long __phys_addr_symbol(unsigned long);
25#else
26#define __phys_addr(x)		__phys_addr_nodebug(x)
27#define __phys_addr_symbol(x) \
28	((unsigned long)(x) - __START_KERNEL_map + phys_base)
29#endif
30
31#define __phys_reloc_hide(x)	(x)
32
33#ifdef CONFIG_FLATMEM
34#define pfn_valid(pfn)          ((pfn) < max_pfn)
35#endif
36
37void clear_page(void *page);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
38void copy_page(void *to, void *from);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
39
40#endif	/* !__ASSEMBLY__ */
41
42#ifdef CONFIG_X86_VSYSCALL_EMULATION
43# define __HAVE_ARCH_GATE_AREA 1
44#endif
45
46#endif /* _ASM_X86_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/cpufeatures.h>
  9#include <asm/alternative.h>
 10
 11#include <linux/kmsan-checks.h>
 12
 13/* duplicated to the one in bootmem.h */
 14extern unsigned long max_pfn;
 15extern unsigned long phys_base;
 16
 17extern unsigned long page_offset_base;
 18extern unsigned long vmalloc_base;
 19extern unsigned long vmemmap_base;
 20
 21static __always_inline unsigned long __phys_addr_nodebug(unsigned long x)
 22{
 23	unsigned long y = x - __START_KERNEL_map;
 24
 25	/* use the carry flag to determine if x was < __START_KERNEL_map */
 26	x = y + ((x > y) ? phys_base : (__START_KERNEL_map - PAGE_OFFSET));
 27
 28	return x;
 29}
 30
 31#ifdef CONFIG_DEBUG_VIRTUAL
 32extern unsigned long __phys_addr(unsigned long);
 33extern unsigned long __phys_addr_symbol(unsigned long);
 34#else
 35#define __phys_addr(x)		__phys_addr_nodebug(x)
 36#define __phys_addr_symbol(x) \
 37	((unsigned long)(x) - __START_KERNEL_map + phys_base)
 38#endif
 39
 40#define __phys_reloc_hide(x)	(x)
 41
 42#ifdef CONFIG_FLATMEM
 43#define pfn_valid(pfn)          ((pfn) < max_pfn)
 44#endif
 45
 46void clear_page_orig(void *page);
 47void clear_page_rep(void *page);
 48void clear_page_erms(void *page);
 49
 50static inline void clear_page(void *page)
 51{
 52	/*
 53	 * Clean up KMSAN metadata for the page being cleared. The assembly call
 54	 * below clobbers @page, so we perform unpoisoning before it.
 55	 */
 56	kmsan_unpoison_memory(page, PAGE_SIZE);
 57	alternative_call_2(clear_page_orig,
 58			   clear_page_rep, X86_FEATURE_REP_GOOD,
 59			   clear_page_erms, X86_FEATURE_ERMS,
 60			   "=D" (page),
 61			   "0" (page)
 62			   : "cc", "memory", "rax", "rcx");
 63}
 64
 65void copy_page(void *to, void *from);
 66
 67#ifdef CONFIG_X86_5LEVEL
 68/*
 69 * User space process size.  This is the first address outside the user range.
 70 * There are a few constraints that determine this:
 71 *
 72 * On Intel CPUs, if a SYSCALL instruction is at the highest canonical
 73 * address, then that syscall will enter the kernel with a
 74 * non-canonical return address, and SYSRET will explode dangerously.
 75 * We avoid this particular problem by preventing anything
 76 * from being mapped at the maximum canonical address.
 77 *
 78 * On AMD CPUs in the Ryzen family, there's a nasty bug in which the
 79 * CPUs malfunction if they execute code from the highest canonical page.
 80 * They'll speculate right off the end of the canonical space, and
 81 * bad things happen.  This is worked around in the same way as the
 82 * Intel problem.
 83 *
 84 * With page table isolation enabled, we map the LDT in ... [stay tuned]
 85 */
 86static __always_inline unsigned long task_size_max(void)
 87{
 88	unsigned long ret;
 89
 90	alternative_io("movq %[small],%0","movq %[large],%0",
 91			X86_FEATURE_LA57,
 92			"=r" (ret),
 93			[small] "i" ((1ul << 47)-PAGE_SIZE),
 94			[large] "i" ((1ul << 56)-PAGE_SIZE));
 95
 96	return ret;
 97}
 98#endif	/* CONFIG_X86_5LEVEL */
 99
100#endif	/* !__ASSEMBLY__ */
101
102#ifdef CONFIG_X86_VSYSCALL_EMULATION
103# define __HAVE_ARCH_GATE_AREA 1
104#endif
105
106#endif /* _ASM_X86_PAGE_64_H */