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  */
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 
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 
126 static inline int srmmu_device_memory(unsigned long x)
127 {
128 	return ((x & 0xF0000000) != 0);
129 }
130 
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 
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 
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 
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 
165 static inline int pte_present(pte_t pte)
166 {
167 	return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
168 }
169 
170 static inline int pte_none(pte_t pte)
171 {
172 	return !pte_val(pte);
173 }
174 
175 static inline void __pte_clear(pte_t *ptep)
176 {
177 	set_pte(ptep, __pte(0));
178 }
179 
180 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
181 {
182 	__pte_clear(ptep);
183 }
184 
185 static inline int pmd_bad(pmd_t pmd)
186 {
187 	return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
188 }
189 
190 static inline int pmd_present(pmd_t pmd)
191 {
192 	return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
193 }
194 
195 static inline int pmd_none(pmd_t pmd)
196 {
197 	return !pmd_val(pmd);
198 }
199 
200 static inline void pmd_clear(pmd_t *pmdp)
201 {
202 	set_pte((pte_t *)&pmd_val(*pmdp), __pte(0));
203 }
204 
205 static inline int pud_none(pud_t pud)
206 {
207 	return !(pud_val(pud) & 0xFFFFFFF);
208 }
209 
210 static inline int pud_bad(pud_t pud)
211 {
212 	return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
213 }
214 
215 static inline int pud_present(pud_t pud)
216 {
217 	return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
218 }
219 
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  */
229 static inline int pte_write(pte_t pte)
230 {
231 	return pte_val(pte) & SRMMU_WRITE;
232 }
233 
234 static inline int pte_dirty(pte_t pte)
235 {
236 	return pte_val(pte) & SRMMU_DIRTY;
237 }
238 
239 static inline int pte_young(pte_t pte)
240 {
241 	return pte_val(pte) & SRMMU_REF;
242 }
243 
244 static inline pte_t pte_wrprotect(pte_t pte)
245 {
246 	return __pte(pte_val(pte) & ~SRMMU_WRITE);
247 }
248 
249 static inline pte_t pte_mkclean(pte_t pte)
250 {
251 	return __pte(pte_val(pte) & ~SRMMU_DIRTY);
252 }
253 
254 static inline pte_t pte_mkold(pte_t pte)
255 {
256 	return __pte(pte_val(pte) & ~SRMMU_REF);
257 }
258 
259 static inline pte_t pte_mkwrite(pte_t pte)
260 {
261 	return __pte(pte_val(pte) | SRMMU_WRITE);
262 }
263 
264 static inline pte_t pte_mkdirty(pte_t pte)
265 {
266 	return __pte(pte_val(pte) | SRMMU_DIRTY);
267 }
268 
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 
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  */
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 
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 
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
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__;
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 struct seq_file;
325 void mmu_info(struct seq_file *m);
326 
327 /* Fault handler stuff... */
328 #define FAULT_CODE_PROT     0x1
329 #define FAULT_CODE_WRITE    0x2
330 #define FAULT_CODE_USER     0x4
331 
332 #define update_mmu_cache(vma, address, ptep) do { } while (0)
333 
334 void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
335                       unsigned long xva, unsigned int len);
336 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);
337 
338 /* Encode and de-code a swap entry */
339 static inline unsigned long __swp_type(swp_entry_t entry)
340 {
341 	return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
342 }
343 
344 static inline unsigned long __swp_offset(swp_entry_t entry)
345 {
346 	return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
347 }
348 
349 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
350 {
351 	return (swp_entry_t) {
352 		(type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
353 		| (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
354 }
355 
356 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
357 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
358 
359 static inline unsigned long
360 __get_phys (unsigned long addr)
361 {
362 	switch (sparc_cpu_model){
363 	case sun4m:
364 	case sun4d:
365 		return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
366 	default:
367 		return 0;
368 	}
369 }
370 
371 static inline int
372 __get_iospace (unsigned long addr)
373 {
374 	switch (sparc_cpu_model){
375 	case sun4m:
376 	case sun4d:
377 		return (srmmu_get_pte (addr) >> 28);
378 	default:
379 		return -1;
380 	}
381 }
382 
383 extern unsigned long *sparc_valid_addr_bitmap;
384 
385 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
386 #define kern_addr_valid(addr) \
387 	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
388 
389 /*
390  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
391  * its high 4 bits.  These macros/functions put it there or get it from there.
392  */
393 #define MK_IOSPACE_PFN(space, pfn)	(pfn | (space << (BITS_PER_LONG - 4)))
394 #define GET_IOSPACE(pfn)		(pfn >> (BITS_PER_LONG - 4))
395 #define GET_PFN(pfn)			(pfn & 0x0fffffffUL)
396 
397 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
398 		    unsigned long, pgprot_t);
399 
400 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
401 				     unsigned long from, unsigned long pfn,
402 				     unsigned long size, pgprot_t prot)
403 {
404 	unsigned long long offset, space, phys_base;
405 
406 	offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
407 	space = GET_IOSPACE(pfn);
408 	phys_base = offset | (space << 32ULL);
409 
410 	return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
411 }
412 #define io_remap_pfn_range io_remap_pfn_range
413 
414 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
415 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
416 ({									  \
417 	int __changed = !pte_same(*(__ptep), __entry);			  \
418 	if (__changed) {						  \
419 		set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
420 		flush_tlb_page(__vma, __address);			  \
421 	}								  \
422 	__changed;							  \
423 })
424 
425 #endif /* !(__ASSEMBLY__) */
426 
427 #define VMALLOC_START           _AC(0xfe600000,UL)
428 #define VMALLOC_END             _AC(0xffc00000,UL)
429 
430 /* We provide our own get_unmapped_area to cope with VA holes for userland */
431 #define HAVE_ARCH_UNMAPPED_AREA
432 
433 #endif /* !(_SPARC_PGTABLE_H) */
434