1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ASM_X86_PGTABLE_2LEVEL_H
3*4882a593Smuzhiyun #define _ASM_X86_PGTABLE_2LEVEL_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #define pte_ERROR(e) \
6*4882a593Smuzhiyun pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
7*4882a593Smuzhiyun #define pgd_ERROR(e) \
8*4882a593Smuzhiyun pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e))
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun * Certain architectures need to do special things when PTEs
12*4882a593Smuzhiyun * within a page table are directly modified. Thus, the following
13*4882a593Smuzhiyun * hook is made available.
14*4882a593Smuzhiyun */
native_set_pte(pte_t * ptep,pte_t pte)15*4882a593Smuzhiyun static inline void native_set_pte(pte_t *ptep , pte_t pte)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun *ptep = pte;
18*4882a593Smuzhiyun }
19*4882a593Smuzhiyun
native_set_pmd(pmd_t * pmdp,pmd_t pmd)20*4882a593Smuzhiyun static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun *pmdp = pmd;
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
native_set_pud(pud_t * pudp,pud_t pud)25*4882a593Smuzhiyun static inline void native_set_pud(pud_t *pudp, pud_t pud)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
native_set_pte_atomic(pte_t * ptep,pte_t pte)29*4882a593Smuzhiyun static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun native_set_pte(ptep, pte);
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
native_pmd_clear(pmd_t * pmdp)34*4882a593Smuzhiyun static inline void native_pmd_clear(pmd_t *pmdp)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun native_set_pmd(pmdp, __pmd(0));
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
native_pud_clear(pud_t * pudp)39*4882a593Smuzhiyun static inline void native_pud_clear(pud_t *pudp)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
native_pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * xp)43*4882a593Smuzhiyun static inline void native_pte_clear(struct mm_struct *mm,
44*4882a593Smuzhiyun unsigned long addr, pte_t *xp)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun *xp = native_make_pte(0);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun #ifdef CONFIG_SMP
native_ptep_get_and_clear(pte_t * xp)50*4882a593Smuzhiyun static inline pte_t native_ptep_get_and_clear(pte_t *xp)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun return __pte(xchg(&xp->pte_low, 0));
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun #else
55*4882a593Smuzhiyun #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
56*4882a593Smuzhiyun #endif
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun #ifdef CONFIG_SMP
native_pmdp_get_and_clear(pmd_t * xp)59*4882a593Smuzhiyun static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun return __pmd(xchg((pmdval_t *)xp, 0));
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun #else
64*4882a593Smuzhiyun #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
65*4882a593Smuzhiyun #endif
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun #ifdef CONFIG_SMP
native_pudp_get_and_clear(pud_t * xp)68*4882a593Smuzhiyun static inline pud_t native_pudp_get_and_clear(pud_t *xp)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun return __pud(xchg((pudval_t *)xp, 0));
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun #else
73*4882a593Smuzhiyun #define native_pudp_get_and_clear(xp) native_local_pudp_get_and_clear(xp)
74*4882a593Smuzhiyun #endif
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun /* Bit manipulation helper on pte/pgoff entry */
pte_bitop(unsigned long value,unsigned int rightshift,unsigned long mask,unsigned int leftshift)77*4882a593Smuzhiyun static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
78*4882a593Smuzhiyun unsigned long mask, unsigned int leftshift)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun return ((value >> rightshift) & mask) << leftshift;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun /* Encode and de-code a swap entry */
84*4882a593Smuzhiyun #define SWP_TYPE_BITS 5
85*4882a593Smuzhiyun #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
90*4882a593Smuzhiyun & ((1U << SWP_TYPE_BITS) - 1))
91*4882a593Smuzhiyun #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
92*4882a593Smuzhiyun #define __swp_entry(type, offset) ((swp_entry_t) { \
93*4882a593Smuzhiyun ((type) << (_PAGE_BIT_PRESENT + 1)) \
94*4882a593Smuzhiyun | ((offset) << SWP_OFFSET_SHIFT) })
95*4882a593Smuzhiyun #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
96*4882a593Smuzhiyun #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun /* No inverted PFNs on 2 level page tables */
99*4882a593Smuzhiyun
protnone_mask(u64 val)100*4882a593Smuzhiyun static inline u64 protnone_mask(u64 val)
101*4882a593Smuzhiyun {
102*4882a593Smuzhiyun return 0;
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
flip_protnone_guard(u64 oldval,u64 val,u64 mask)105*4882a593Smuzhiyun static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask)
106*4882a593Smuzhiyun {
107*4882a593Smuzhiyun return val;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
__pte_needs_invert(u64 val)110*4882a593Smuzhiyun static inline bool __pte_needs_invert(u64 val)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun return false;
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun #endif /* _ASM_X86_PGTABLE_2LEVEL_H */
116