Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 this as a macro to avoid include dependency mess */
57#define pte_page(x) pfn_to_page(pte_pfn(x))
58
59static inline unsigned long pte_pfn(pte_t pte)
60{
61 return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT;
62}
63
64/*
65 * Select all bits except the pfn
66 */
67#define pte_pgprot pte_pgprot
68static inline pgprot_t pte_pgprot(pte_t pte)
69{
70 unsigned long pte_flags;
71
72 pte_flags = pte_val(pte) & ~PTE_RPN_MASK;
73 return __pgprot(pte_flags);
74}
75
76static inline pgprot_t pgprot_nx(pgprot_t prot)
77{
78 return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot))));
79}
80#define pgprot_nx pgprot_nx
81
82#ifndef pmd_page_vaddr
83static inline const void *pmd_page_vaddr(pmd_t pmd)
84{
85 return __va(pmd_val(pmd) & ~PMD_MASKED_BITS);
86}
87#define pmd_page_vaddr pmd_page_vaddr
88#endif
89/*
90 * ZERO_PAGE is a global shared page that is always zero: used
91 * for zero-mapped memory areas etc..
92 */
93extern unsigned long empty_zero_page[];
94#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
95
96extern pgd_t swapper_pg_dir[];
97
98extern void paging_init(void);
99void poking_init(void);
100
101extern unsigned long ioremap_bot;
102extern const pgprot_t protection_map[16];
103
104/* can we use this in kvm */
105unsigned long vmalloc_to_phys(void *vmalloc_addr);
106
107void pgtable_cache_add(unsigned int shift);
108
109#ifdef CONFIG_PPC32
110void __init *early_alloc_pgtable(unsigned long size);
111#endif
112pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
113
114#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
115void mark_initmem_nx(void);
116#else
117static inline void mark_initmem_nx(void) { }
118#endif
119
120#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
121int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
122 pte_t *ptep, pte_t entry, int dirty);
123
124pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,
125 pgprot_t vma_prot);
126
127struct file;
128static inline pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
129 unsigned long size, pgprot_t vma_prot)
130{
131 return __phys_mem_access_prot(pfn, size, vma_prot);
132}
133#define __HAVE_PHYS_MEM_ACCESS_PROT
134
135void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep);
136
137/*
138 * This gets called at the end of handling a page fault, when
139 * the kernel has put a new PTE into the page table for the process.
140 * We use it to ensure coherency between the i-cache and d-cache
141 * for the page which has just been mapped in.
142 * On machines which use an MMU hash table, we use this to put a
143 * corresponding HPTE into the hash table ahead of time, instead of
144 * waiting for the inevitable extra hash-table miss exception.
145 */
146static inline void update_mmu_cache_range(struct vm_fault *vmf,
147 struct vm_area_struct *vma, unsigned long address,
148 pte_t *ptep, unsigned int nr)
149{
150 if ((mmu_has_feature(MMU_FTR_HPTE_TABLE) && !radix_enabled()) ||
151 (IS_ENABLED(CONFIG_PPC_E500) && IS_ENABLED(CONFIG_HUGETLB_PAGE)))
152 __update_mmu_cache(vma, address, ptep);
153}
154
155/*
156 * When used, PTE_FRAG_NR is defined in subarch pgtable.h
157 * so we are sure it is included when arriving here.
158 */
159#ifdef PTE_FRAG_NR
160static inline void *pte_frag_get(mm_context_t *ctx)
161{
162 return ctx->pte_frag;
163}
164
165static inline void pte_frag_set(mm_context_t *ctx, void *p)
166{
167 ctx->pte_frag = p;
168}
169#else
170#define PTE_FRAG_NR 1
171#define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT
172#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
173
174static inline void *pte_frag_get(mm_context_t *ctx)
175{
176 return NULL;
177}
178
179static inline void pte_frag_set(mm_context_t *ctx, void *p)
180{
181}
182#endif
183
184#define pmd_pgtable pmd_pgtable
185static inline pgtable_t pmd_pgtable(pmd_t pmd)
186{
187 return (pgtable_t)pmd_page_vaddr(pmd);
188}
189
190#ifdef CONFIG_PPC64
191int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size);
192bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start,
193 unsigned long page_size);
194/*
195 * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details
196 * some of the restrictions. We don't check for PMD_SIZE because our
197 * vmemmap allocation code can fallback correctly. The pageblock
198 * alignment requirement is met using altmap->reserve blocks.
199 */
200#define arch_supports_memmap_on_memory arch_supports_memmap_on_memory
201static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size)
202{
203 if (!radix_enabled())
204 return false;
205 /*
206 * With 4K page size and 2M PMD_SIZE, we can align
207 * things better with memory block size value
208 * starting from 128MB. Hence align things with PMD_SIZE.
209 */
210 if (IS_ENABLED(CONFIG_PPC_4K_PAGES))
211 return IS_ALIGNED(vmemmap_size, PMD_SIZE);
212 return true;
213}
214
215#endif /* CONFIG_PPC64 */
216
217#endif /* __ASSEMBLY__ */
218
219#endif /* _ASM_POWERPC_PGTABLE_H */