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-rw-r--r--arch/m32r/include/asm/pgtable.h348
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diff --git a/arch/m32r/include/asm/pgtable.h b/arch/m32r/include/asm/pgtable.h
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_M32R_PGTABLE_H
3#define _ASM_M32R_PGTABLE_H
4
5#include <asm-generic/4level-fixup.h>
6
7#ifdef __KERNEL__
8/*
9 * The Linux memory management assumes a three-level page table setup. On
10 * the M32R, we use that, but "fold" the mid level into the top-level page
11 * table, so that we physically have the same two-level page table as the
12 * M32R mmu expects.
13 *
14 * This file contains the functions and defines necessary to modify and use
15 * the M32R page table tree.
16 */
17
18/* CAUTION!: If you change macro definitions in this file, you might have to
19 * change arch/m32r/mmu.S manually.
20 */
21
22#ifndef __ASSEMBLY__
23
24#include <linux/threads.h>
25#include <linux/bitops.h>
26#include <asm/processor.h>
27#include <asm/addrspace.h>
28#include <asm/page.h>
29
30struct mm_struct;
31struct vm_area_struct;
32
33extern pgd_t swapper_pg_dir[1024];
34extern void paging_init(void);
35
36/*
37 * ZERO_PAGE is a global shared page that is always zero: used
38 * for zero-mapped memory areas etc..
39 */
40extern unsigned long empty_zero_page[1024];
41#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
42
43#endif /* !__ASSEMBLY__ */
44
45#ifndef __ASSEMBLY__
46#include <asm/pgtable-2level.h>
47#endif
48
49#define pgtable_cache_init() do { } while (0)
50
51#define PMD_SIZE (1UL << PMD_SHIFT)
52#define PMD_MASK (~(PMD_SIZE - 1))
53#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
54#define PGDIR_MASK (~(PGDIR_SIZE - 1))
55
56#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
57#define FIRST_USER_ADDRESS 0UL
58
59#ifndef __ASSEMBLY__
60/* Just any arbitrary offset to the start of the vmalloc VM area: the
61 * current 8MB value just means that there will be a 8MB "hole" after the
62 * physical memory until the kernel virtual memory starts. That means that
63 * any out-of-bounds memory accesses will hopefully be caught.
64 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
65 * area for the same reason. ;)
66 */
67#define VMALLOC_START KSEG2
68#define VMALLOC_END KSEG3
69
70/*
71 * M32R TLB format
72 *
73 * [0] [1:19] [20:23] [24:31]
74 * +-----------------------+----+-------------+
75 * | VPN |0000| ASID |
76 * +-----------------------+----+-------------+
77 * +-+---------------------+----+-+---+-+-+-+-+
78 * |0 PPN |0000|N|AC |L|G|V| |
79 * +-+---------------------+----+-+---+-+-+-+-+
80 * RWX
81 */
82
83#define _PAGE_BIT_DIRTY 0 /* software: page changed */
84#define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */
85#define _PAGE_BIT_GLOBAL 2 /* Global */
86#define _PAGE_BIT_LARGE 3 /* Large */
87#define _PAGE_BIT_EXEC 4 /* Execute */
88#define _PAGE_BIT_WRITE 5 /* Write */
89#define _PAGE_BIT_READ 6 /* Read */
90#define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */
91#define _PAGE_BIT_ACCESSED 8 /* software: page referenced */
92#define _PAGE_BIT_PROTNONE 9 /* software: if not present */
93
94#define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY)
95#define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT)
96#define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL)
97#define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE)
98#define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC)
99#define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE)
100#define _PAGE_READ (1UL << _PAGE_BIT_READ)
101#define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE)
102#define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED)
103#define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE)
104
105#define _PAGE_TABLE \
106 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
107 | _PAGE_DIRTY )
108#define _KERNPG_TABLE \
109 ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
110 | _PAGE_DIRTY )
111#define _PAGE_CHG_MASK \
112 ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
113
114#ifdef CONFIG_MMU
115#define PAGE_NONE \
116 __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
117#define PAGE_SHARED \
118 __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
119#define PAGE_SHARED_EXEC \
120 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
121 | _PAGE_ACCESSED)
122#define PAGE_COPY \
123 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
124#define PAGE_COPY_EXEC \
125 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
126#define PAGE_READONLY \
127 __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
128#define PAGE_READONLY_EXEC \
129 __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
130
131#define __PAGE_KERNEL \
132 ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
133 | _PAGE_ACCESSED )
134#define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE )
135#define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
136
137#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
138
139#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
140#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
141#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
142
143#else
144#define PAGE_NONE __pgprot(0)
145#define PAGE_SHARED __pgprot(0)
146#define PAGE_SHARED_EXEC __pgprot(0)
147#define PAGE_COPY __pgprot(0)
148#define PAGE_COPY_EXEC __pgprot(0)
149#define PAGE_READONLY __pgprot(0)
150#define PAGE_READONLY_EXEC __pgprot(0)
151
152#define PAGE_KERNEL __pgprot(0)
153#define PAGE_KERNEL_RO __pgprot(0)
154#define PAGE_KERNEL_NOCACHE __pgprot(0)
155#endif /* CONFIG_MMU */
156
157 /* xwr */
158#define __P000 PAGE_NONE
159#define __P001 PAGE_READONLY
160#define __P010 PAGE_COPY
161#define __P011 PAGE_COPY
162#define __P100 PAGE_READONLY_EXEC
163#define __P101 PAGE_READONLY_EXEC
164#define __P110 PAGE_COPY_EXEC
165#define __P111 PAGE_COPY_EXEC
166
167#define __S000 PAGE_NONE
168#define __S001 PAGE_READONLY
169#define __S010 PAGE_SHARED
170#define __S011 PAGE_SHARED
171#define __S100 PAGE_READONLY_EXEC
172#define __S101 PAGE_READONLY_EXEC
173#define __S110 PAGE_SHARED_EXEC
174#define __S111 PAGE_SHARED_EXEC
175
176/* page table for 0-4MB for everybody */
177
178#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
179#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
180
181#define pmd_none(x) (!pmd_val(x))
182#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
183#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
184#define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
185
186#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
187
188/*
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
191 */
192static inline int pte_dirty(pte_t pte)
193{
194 return pte_val(pte) & _PAGE_DIRTY;
195}
196
197static inline int pte_young(pte_t pte)
198{
199 return pte_val(pte) & _PAGE_ACCESSED;
200}
201
202static inline int pte_write(pte_t pte)
203{
204 return pte_val(pte) & _PAGE_WRITE;
205}
206
207static inline int pte_special(pte_t pte)
208{
209 return 0;
210}
211
212static inline pte_t pte_mkclean(pte_t pte)
213{
214 pte_val(pte) &= ~_PAGE_DIRTY;
215 return pte;
216}
217
218static inline pte_t pte_mkold(pte_t pte)
219{
220 pte_val(pte) &= ~_PAGE_ACCESSED;
221 return pte;
222}
223
224static inline pte_t pte_wrprotect(pte_t pte)
225{
226 pte_val(pte) &= ~_PAGE_WRITE;
227 return pte;
228}
229
230static inline pte_t pte_mkdirty(pte_t pte)
231{
232 pte_val(pte) |= _PAGE_DIRTY;
233 return pte;
234}
235
236static inline pte_t pte_mkyoung(pte_t pte)
237{
238 pte_val(pte) |= _PAGE_ACCESSED;
239 return pte;
240}
241
242static inline pte_t pte_mkwrite(pte_t pte)
243{
244 pte_val(pte) |= _PAGE_WRITE;
245 return pte;
246}
247
248static inline pte_t pte_mkspecial(pte_t pte)
249{
250 return pte;
251}
252
253static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
254{
255 return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
256}
257
258static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
259{
260 clear_bit(_PAGE_BIT_WRITE, ptep);
261}
262
263/*
264 * Macro and implementation to make a page protection as uncachable.
265 */
266static inline pgprot_t pgprot_noncached(pgprot_t _prot)
267{
268 unsigned long prot = pgprot_val(_prot);
269
270 prot |= _PAGE_NONCACHABLE;
271 return __pgprot(prot);
272}
273
274#define pgprot_writecombine(prot) pgprot_noncached(prot)
275
276/*
277 * Conversion functions: convert a page and protection to a page entry,
278 * and a page entry and page directory to the page they refer to.
279 */
280#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), pgprot)
281
282static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
283{
284 set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
285 | pgprot_val(newprot)));
286
287 return pte;
288}
289
290/*
291 * Conversion functions: convert a page and protection to a page entry,
292 * and a page entry and page directory to the page they refer to.
293 */
294
295static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
296{
297 pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
298}
299
300#define pmd_page_vaddr(pmd) \
301 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
302
303#ifndef CONFIG_DISCONTIGMEM
304#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
305#endif /* !CONFIG_DISCONTIGMEM */
306
307/* to find an entry in a page-table-directory. */
308#define pgd_index(address) \
309 (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
310
311#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
312
313/* to find an entry in a kernel page-table-directory */
314#define pgd_offset_k(address) pgd_offset(&init_mm, address)
315
316#define pmd_index(address) \
317 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
318
319#define pte_index(address) \
320 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
321#define pte_offset_kernel(dir, address) \
322 ((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
323#define pte_offset_map(dir, address) \
324 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
325#define pte_unmap(pte) do { } while (0)
326
327/* Encode and de-code a swap entry */
328#define __swp_type(x) (((x).val >> 2) & 0x1f)
329#define __swp_offset(x) ((x).val >> 10)
330#define __swp_entry(type, offset) \
331 ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
332#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
333#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
334
335#endif /* !__ASSEMBLY__ */
336
337/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
338#define kern_addr_valid(addr) (1)
339
340#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
341#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
342#define __HAVE_ARCH_PTEP_SET_WRPROTECT
343#define __HAVE_ARCH_PTE_SAME
344#include <asm-generic/pgtable.h>
345
346#endif /* __KERNEL__ */
347
348#endif /* _ASM_M32R_PGTABLE_H */
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