Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_PGTABLE_H
3#define _ASM_POWERPC_PGTABLE_H
4
5#ifndef __ASSEMBLY__
6#include <linux/mmdebug.h>
7#include <linux/mmzone.h>
8#include <asm/processor.h> /* For TASK_SIZE */
9#include <asm/mmu.h>
10#include <asm/page.h>
11#include <asm/tlbflush.h>
12
13struct mm_struct;
14
15#endif /* !__ASSEMBLY__ */
16
17#ifdef CONFIG_PPC_BOOK3S
18#include <asm/book3s/pgtable.h>
19#else
20#include <asm/nohash/pgtable.h>
21#endif /* !CONFIG_PPC_BOOK3S */
22
23/*
24 * Protection used for kernel text. We want the debuggers to be able to
25 * set breakpoints anywhere, so don't write protect the kernel text
26 * on platforms where such control is possible.
27 */
28#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) || \
29 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
30#define PAGE_KERNEL_TEXT PAGE_KERNEL_X
31#else
32#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
33#endif
34
35/* Make modules code happy. We don't set RO yet */
36#define PAGE_KERNEL_EXEC PAGE_KERNEL_X
37
38/* Advertise special mapping type for AGP */
39#define PAGE_AGP (PAGE_KERNEL_NC)
40#define HAVE_PAGE_AGP
41
42#ifndef __ASSEMBLY__
43
44#define PFN_PTE_SHIFT PTE_RPN_SHIFT
45
46void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
47 pte_t pte, unsigned int nr);
48#define set_ptes set_ptes
49#define update_mmu_cache(vma, addr, ptep) \
50 update_mmu_cache_range(NULL, vma, addr, ptep, 1)
51
52#ifndef MAX_PTRS_PER_PGD
53#define MAX_PTRS_PER_PGD PTRS_PER_PGD
54#endif
55
56/* Keep these as a macros to avoid include dependency mess */
57#define pte_page(x) pfn_to_page(pte_pfn(x))
58#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
59
60static inline unsigned long pte_pfn(pte_t pte)
61{
62 return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT;
63}
64
65/*
66 * Select all bits except the pfn
67 */
68#define pte_pgprot pte_pgprot
69static inline pgprot_t pte_pgprot(pte_t pte)
70{
71 unsigned long pte_flags;
72
73 pte_flags = pte_val(pte) & ~PTE_RPN_MASK;
74 return __pgprot(pte_flags);
75}
76
77static inline pgprot_t pgprot_nx(pgprot_t prot)
78{
79 return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot))));
80}
81#define pgprot_nx pgprot_nx
82
83#ifndef pmd_page_vaddr
84static inline const void *pmd_page_vaddr(pmd_t pmd)
85{
86 return __va(pmd_val(pmd) & ~PMD_MASKED_BITS);
87}
88#define pmd_page_vaddr pmd_page_vaddr
89#endif
90/*
91 * ZERO_PAGE is a global shared page that is always zero: used
92 * for zero-mapped memory areas etc..
93 */
94extern unsigned long empty_zero_page[];
95#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
96
97extern pgd_t swapper_pg_dir[];
98
99extern void paging_init(void);
100void poking_init(void);
101
102extern unsigned long ioremap_bot;
103extern const pgprot_t protection_map[16];
104
105/* can we use this in kvm */
106unsigned long vmalloc_to_phys(void *vmalloc_addr);
107
108void pgtable_cache_add(unsigned int shift);
109
110#ifdef CONFIG_PPC32
111void __init *early_alloc_pgtable(unsigned long size);
112#endif
113pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
114
115#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
116void mark_initmem_nx(void);
117#else
118static inline void mark_initmem_nx(void) { }
119#endif
120
121#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
122int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
123 pte_t *ptep, pte_t entry, int dirty);
124
125pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,
126 pgprot_t vma_prot);
127
128struct file;
129static inline pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
130 unsigned long size, pgprot_t vma_prot)
131{
132 return __phys_mem_access_prot(pfn, size, vma_prot);
133}
134#define __HAVE_PHYS_MEM_ACCESS_PROT
135
136void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep);
137
138/*
139 * This gets called at the end of handling a page fault, when
140 * the kernel has put a new PTE into the page table for the process.
141 * We use it to ensure coherency between the i-cache and d-cache
142 * for the page which has just been mapped in.
143 * On machines which use an MMU hash table, we use this to put a
144 * corresponding HPTE into the hash table ahead of time, instead of
145 * waiting for the inevitable extra hash-table miss exception.
146 */
147static inline void update_mmu_cache_range(struct vm_fault *vmf,
148 struct vm_area_struct *vma, unsigned long address,
149 pte_t *ptep, unsigned int nr)
150{
151 if ((mmu_has_feature(MMU_FTR_HPTE_TABLE) && !radix_enabled()) ||
152 (IS_ENABLED(CONFIG_PPC_E500) && IS_ENABLED(CONFIG_HUGETLB_PAGE)))
153 __update_mmu_cache(vma, address, ptep);
154}
155
156/*
157 * When used, PTE_FRAG_NR is defined in subarch pgtable.h
158 * so we are sure it is included when arriving here.
159 */
160#ifdef PTE_FRAG_NR
161static inline void *pte_frag_get(mm_context_t *ctx)
162{
163 return ctx->pte_frag;
164}
165
166static inline void pte_frag_set(mm_context_t *ctx, void *p)
167{
168 ctx->pte_frag = p;
169}
170#else
171#define PTE_FRAG_NR 1
172#define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT
173#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
174
175static inline void *pte_frag_get(mm_context_t *ctx)
176{
177 return NULL;
178}
179
180static inline void pte_frag_set(mm_context_t *ctx, void *p)
181{
182}
183#endif
184
185#define pmd_pgtable pmd_pgtable
186static inline pgtable_t pmd_pgtable(pmd_t pmd)
187{
188 return (pgtable_t)pmd_page_vaddr(pmd);
189}
190
191#ifdef CONFIG_PPC64
192int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size);
193bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start,
194 unsigned long page_size);
195/*
196 * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details
197 * some of the restrictions. We don't check for PMD_SIZE because our
198 * vmemmap allocation code can fallback correctly. The pageblock
199 * alignment requirement is met using altmap->reserve blocks.
200 */
201#define arch_supports_memmap_on_memory arch_supports_memmap_on_memory
202static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size)
203{
204 if (!radix_enabled())
205 return false;
206 /*
207 * With 4K page size and 2M PMD_SIZE, we can align
208 * things better with memory block size value
209 * starting from 128MB. Hence align things with PMD_SIZE.
210 */
211 if (IS_ENABLED(CONFIG_PPC_4K_PAGES))
212 return IS_ALIGNED(vmemmap_size, PMD_SIZE);
213 return true;
214}
215
216#endif /* CONFIG_PPC64 */
217
218#endif /* __ASSEMBLY__ */
219
220#endif /* _ASM_POWERPC_PGTABLE_H */