1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SPARC_PGTABLE_H
3 #define _SPARC_PGTABLE_H
4
5 /* asm/pgtable.h: Defines and functions used to work
6 * with Sparc page tables.
7 *
8 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
10 */
11
12 #include <linux/const.h>
13
14 #define PMD_SHIFT 18
15 #define PMD_SIZE (1UL << PMD_SHIFT)
16 #define PMD_MASK (~(PMD_SIZE-1))
17 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
18
19 #define PGDIR_SHIFT 24
20 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
21 #define PGDIR_MASK (~(PGDIR_SIZE-1))
22 #define PGDIR_ALIGN(__addr) (((__addr) + ~PGDIR_MASK) & PGDIR_MASK)
23
24 #ifndef __ASSEMBLY__
25 #include <asm-generic/pgtable-nopud.h>
26
27 #include <linux/spinlock.h>
28 #include <linux/mm_types.h>
29 #include <asm/types.h>
30 #include <asm/pgtsrmmu.h>
31 #include <asm/vaddrs.h>
32 #include <asm/oplib.h>
33 #include <asm/cpu_type.h>
34
35
36 struct vm_area_struct;
37 struct page;
38
39 void load_mmu(void);
40 unsigned long calc_highpages(void);
41 unsigned long __init bootmem_init(unsigned long *pages_avail);
42
43 #define pte_ERROR(e) __builtin_trap()
44 #define pmd_ERROR(e) __builtin_trap()
45 #define pgd_ERROR(e) __builtin_trap()
46
47 #define PTRS_PER_PTE 64
48 #define PTRS_PER_PMD 64
49 #define PTRS_PER_PGD 256
50 #define USER_PTRS_PER_PGD PAGE_OFFSET / PGDIR_SIZE
51 #define FIRST_USER_ADDRESS 0UL
52 #define PTE_SIZE (PTRS_PER_PTE*4)
53
54 #define PAGE_NONE SRMMU_PAGE_NONE
55 #define PAGE_SHARED SRMMU_PAGE_SHARED
56 #define PAGE_COPY SRMMU_PAGE_COPY
57 #define PAGE_READONLY SRMMU_PAGE_RDONLY
58 #define PAGE_KERNEL SRMMU_PAGE_KERNEL
59
60 /* Top-level page directory - dummy used by init-mm.
61 * srmmu.c will assign the real one (which is dynamically sized) */
62 #define swapper_pg_dir NULL
63
64 void paging_init(void);
65
66 extern unsigned long ptr_in_current_pgd;
67
68 /* xwr */
69 #define __P000 PAGE_NONE
70 #define __P001 PAGE_READONLY
71 #define __P010 PAGE_COPY
72 #define __P011 PAGE_COPY
73 #define __P100 PAGE_READONLY
74 #define __P101 PAGE_READONLY
75 #define __P110 PAGE_COPY
76 #define __P111 PAGE_COPY
77
78 #define __S000 PAGE_NONE
79 #define __S001 PAGE_READONLY
80 #define __S010 PAGE_SHARED
81 #define __S011 PAGE_SHARED
82 #define __S100 PAGE_READONLY
83 #define __S101 PAGE_READONLY
84 #define __S110 PAGE_SHARED
85 #define __S111 PAGE_SHARED
86
87 /* First physical page can be anywhere, the following is needed so that
88 * va-->pa and vice versa conversions work properly without performance
89 * hit for all __pa()/__va() operations.
90 */
91 extern unsigned long phys_base;
92 extern unsigned long pfn_base;
93
94 /*
95 * ZERO_PAGE is a global shared page that is always zero: used
96 * for zero-mapped memory areas etc..
97 */
98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
99
100 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
101
102 /*
103 * In general all page table modifications should use the V8 atomic
104 * swap instruction. This insures the mmu and the cpu are in sync
105 * with respect to ref/mod bits in the page tables.
106 */
srmmu_swap(unsigned long * addr,unsigned long value)107 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
108 {
109 __asm__ __volatile__("swap [%2], %0" :
110 "=&r" (value) : "0" (value), "r" (addr) : "memory");
111 return value;
112 }
113
114 /* Certain architectures need to do special things when pte's
115 * within a page table are directly modified. Thus, the following
116 * hook is made available.
117 */
118
set_pte(pte_t * ptep,pte_t pteval)119 static inline void set_pte(pte_t *ptep, pte_t pteval)
120 {
121 srmmu_swap((unsigned long *)ptep, pte_val(pteval));
122 }
123
124 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
125
srmmu_device_memory(unsigned long x)126 static inline int srmmu_device_memory(unsigned long x)
127 {
128 return ((x & 0xF0000000) != 0);
129 }
130
pmd_page(pmd_t pmd)131 static inline struct page *pmd_page(pmd_t pmd)
132 {
133 if (srmmu_device_memory(pmd_val(pmd)))
134 BUG();
135 return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
136 }
137
__pmd_page(pmd_t pmd)138 static inline unsigned long __pmd_page(pmd_t pmd)
139 {
140 unsigned long v;
141
142 if (srmmu_device_memory(pmd_val(pmd)))
143 BUG();
144
145 v = pmd_val(pmd) & SRMMU_PTD_PMASK;
146 return (unsigned long)__nocache_va(v << 4);
147 }
148
pmd_page_vaddr(pmd_t pmd)149 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
150 {
151 unsigned long v = pmd_val(pmd) & SRMMU_PTD_PMASK;
152 return (unsigned long)__nocache_va(v << 4);
153 }
154
pud_page_vaddr(pud_t pud)155 static inline unsigned long pud_page_vaddr(pud_t pud)
156 {
157 if (srmmu_device_memory(pud_val(pud))) {
158 return ~0;
159 } else {
160 unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK;
161 return (unsigned long)__nocache_va(v << 4);
162 }
163 }
164
pte_present(pte_t pte)165 static inline int pte_present(pte_t pte)
166 {
167 return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
168 }
169
pte_none(pte_t pte)170 static inline int pte_none(pte_t pte)
171 {
172 return !pte_val(pte);
173 }
174
__pte_clear(pte_t * ptep)175 static inline void __pte_clear(pte_t *ptep)
176 {
177 set_pte(ptep, __pte(0));
178 }
179
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)180 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
181 {
182 __pte_clear(ptep);
183 }
184
pmd_bad(pmd_t pmd)185 static inline int pmd_bad(pmd_t pmd)
186 {
187 return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
188 }
189
pmd_present(pmd_t pmd)190 static inline int pmd_present(pmd_t pmd)
191 {
192 return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
193 }
194
pmd_none(pmd_t pmd)195 static inline int pmd_none(pmd_t pmd)
196 {
197 return !pmd_val(pmd);
198 }
199
pmd_clear(pmd_t * pmdp)200 static inline void pmd_clear(pmd_t *pmdp)
201 {
202 set_pte((pte_t *)&pmd_val(*pmdp), __pte(0));
203 }
204
pud_none(pud_t pud)205 static inline int pud_none(pud_t pud)
206 {
207 return !(pud_val(pud) & 0xFFFFFFF);
208 }
209
pud_bad(pud_t pud)210 static inline int pud_bad(pud_t pud)
211 {
212 return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
213 }
214
pud_present(pud_t pud)215 static inline int pud_present(pud_t pud)
216 {
217 return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
218 }
219
pud_clear(pud_t * pudp)220 static inline void pud_clear(pud_t *pudp)
221 {
222 set_pte((pte_t *)pudp, __pte(0));
223 }
224
225 /*
226 * The following only work if pte_present() is true.
227 * Undefined behaviour if not..
228 */
pte_write(pte_t pte)229 static inline int pte_write(pte_t pte)
230 {
231 return pte_val(pte) & SRMMU_WRITE;
232 }
233
pte_dirty(pte_t pte)234 static inline int pte_dirty(pte_t pte)
235 {
236 return pte_val(pte) & SRMMU_DIRTY;
237 }
238
pte_young(pte_t pte)239 static inline int pte_young(pte_t pte)
240 {
241 return pte_val(pte) & SRMMU_REF;
242 }
243
pte_wrprotect(pte_t pte)244 static inline pte_t pte_wrprotect(pte_t pte)
245 {
246 return __pte(pte_val(pte) & ~SRMMU_WRITE);
247 }
248
pte_mkclean(pte_t pte)249 static inline pte_t pte_mkclean(pte_t pte)
250 {
251 return __pte(pte_val(pte) & ~SRMMU_DIRTY);
252 }
253
pte_mkold(pte_t pte)254 static inline pte_t pte_mkold(pte_t pte)
255 {
256 return __pte(pte_val(pte) & ~SRMMU_REF);
257 }
258
pte_mkwrite(pte_t pte)259 static inline pte_t pte_mkwrite(pte_t pte)
260 {
261 return __pte(pte_val(pte) | SRMMU_WRITE);
262 }
263
pte_mkdirty(pte_t pte)264 static inline pte_t pte_mkdirty(pte_t pte)
265 {
266 return __pte(pte_val(pte) | SRMMU_DIRTY);
267 }
268
pte_mkyoung(pte_t pte)269 static inline pte_t pte_mkyoung(pte_t pte)
270 {
271 return __pte(pte_val(pte) | SRMMU_REF);
272 }
273
274 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
275
pte_pfn(pte_t pte)276 static inline unsigned long pte_pfn(pte_t pte)
277 {
278 if (srmmu_device_memory(pte_val(pte))) {
279 /* Just return something that will cause
280 * pfn_valid() to return false. This makes
281 * copy_one_pte() to just directly copy to
282 * PTE over.
283 */
284 return ~0UL;
285 }
286 return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
287 }
288
289 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
290
291 /*
292 * Conversion functions: convert a page and protection to a page entry,
293 * and a page entry and page directory to the page they refer to.
294 */
mk_pte(struct page * page,pgprot_t pgprot)295 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
296 {
297 return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
298 }
299
mk_pte_phys(unsigned long page,pgprot_t pgprot)300 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
301 {
302 return __pte(((page) >> 4) | pgprot_val(pgprot));
303 }
304
mk_pte_io(unsigned long page,pgprot_t pgprot,int space)305 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
306 {
307 return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
308 }
309
310 #define pgprot_noncached pgprot_noncached
pgprot_noncached(pgprot_t prot)311 static inline pgprot_t pgprot_noncached(pgprot_t prot)
312 {
313 pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE));
314 return prot;
315 }
316
317 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
pte_modify(pte_t pte,pgprot_t newprot)318 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
319 {
320 return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
321 pgprot_val(newprot));
322 }
323
324 /* only used by the huge vmap code, should never be called */
325 #define pud_page(pud) NULL
326
327 struct seq_file;
328 void mmu_info(struct seq_file *m);
329
330 /* Fault handler stuff... */
331 #define FAULT_CODE_PROT 0x1
332 #define FAULT_CODE_WRITE 0x2
333 #define FAULT_CODE_USER 0x4
334
335 #define update_mmu_cache(vma, address, ptep) do { } while (0)
336
337 void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
338 unsigned long xva, unsigned int len);
339 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);
340
341 /* Encode and de-code a swap entry */
__swp_type(swp_entry_t entry)342 static inline unsigned long __swp_type(swp_entry_t entry)
343 {
344 return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
345 }
346
__swp_offset(swp_entry_t entry)347 static inline unsigned long __swp_offset(swp_entry_t entry)
348 {
349 return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
350 }
351
__swp_entry(unsigned long type,unsigned long offset)352 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
353 {
354 return (swp_entry_t) {
355 (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
356 | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
357 }
358
359 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
360 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
361
362 static inline unsigned long
__get_phys(unsigned long addr)363 __get_phys (unsigned long addr)
364 {
365 switch (sparc_cpu_model){
366 case sun4m:
367 case sun4d:
368 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
369 default:
370 return 0;
371 }
372 }
373
374 static inline int
__get_iospace(unsigned long addr)375 __get_iospace (unsigned long addr)
376 {
377 switch (sparc_cpu_model){
378 case sun4m:
379 case sun4d:
380 return (srmmu_get_pte (addr) >> 28);
381 default:
382 return -1;
383 }
384 }
385
386 extern unsigned long *sparc_valid_addr_bitmap;
387
388 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
389 #define kern_addr_valid(addr) \
390 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
391
392 /*
393 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
394 * its high 4 bits. These macros/functions put it there or get it from there.
395 */
396 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
397 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
398 #define GET_PFN(pfn) (pfn & 0x0fffffffUL)
399
400 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
401 unsigned long, pgprot_t);
402
io_remap_pfn_range(struct vm_area_struct * vma,unsigned long from,unsigned long pfn,unsigned long size,pgprot_t prot)403 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
404 unsigned long from, unsigned long pfn,
405 unsigned long size, pgprot_t prot)
406 {
407 unsigned long long offset, space, phys_base;
408
409 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
410 space = GET_IOSPACE(pfn);
411 phys_base = offset | (space << 32ULL);
412
413 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
414 }
415 #define io_remap_pfn_range io_remap_pfn_range
416
417 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
418 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
419 ({ \
420 int __changed = !pte_same(*(__ptep), __entry); \
421 if (__changed) { \
422 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
423 flush_tlb_page(__vma, __address); \
424 } \
425 __changed; \
426 })
427
428 #endif /* !(__ASSEMBLY__) */
429
430 #define VMALLOC_START _AC(0xfe600000,UL)
431 #define VMALLOC_END _AC(0xffc00000,UL)
432
433 /* We provide our own get_unmapped_area to cope with VA holes for userland */
434 #define HAVE_ARCH_UNMAPPED_AREA
435
436 #endif /* !(_SPARC_PGTABLE_H) */
437