summaryrefslogtreecommitdiffstats
path: root/arch/sparc/include/asm/pgtable_32.h
blob: ce6f56980aefd2902bfae849eb90a993295976eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
#ifndef _SPARC_PGTABLE_H
#define _SPARC_PGTABLE_H

/*  asm/pgtable.h:  Defines and functions used to work
 *                        with Sparc page tables.
 *
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/const.h>

#ifndef __ASSEMBLY__
#include <asm-generic/4level-fixup.h>

#include <linux/spinlock.h>
#include <linux/mm_types.h>
#include <asm/types.h>
#include <asm/pgtsrmmu.h>
#include <asm/vaddrs.h>
#include <asm/oplib.h>
#include <asm/cpu_type.h>


struct vm_area_struct;
struct page;

void load_mmu(void);
unsigned long calc_highpages(void);
unsigned long __init bootmem_init(unsigned long *pages_avail);

#define pte_ERROR(e)   __builtin_trap()
#define pmd_ERROR(e)   __builtin_trap()
#define pgd_ERROR(e)   __builtin_trap()

#define PMD_SHIFT		22
#define PMD_SIZE        	(1UL << PMD_SHIFT)
#define PMD_MASK        	(~(PMD_SIZE-1))
#define PMD_ALIGN(__addr) 	(((__addr) + ~PMD_MASK) & PMD_MASK)
#define PGDIR_SHIFT     	SRMMU_PGDIR_SHIFT
#define PGDIR_SIZE      	SRMMU_PGDIR_SIZE
#define PGDIR_MASK      	SRMMU_PGDIR_MASK
#define PTRS_PER_PTE    	1024
#define PTRS_PER_PMD    	SRMMU_PTRS_PER_PMD
#define PTRS_PER_PGD    	SRMMU_PTRS_PER_PGD
#define USER_PTRS_PER_PGD	PAGE_OFFSET / SRMMU_PGDIR_SIZE
#define FIRST_USER_ADDRESS	0UL
#define PTE_SIZE		(PTRS_PER_PTE*4)

#define PAGE_NONE	SRMMU_PAGE_NONE
#define PAGE_SHARED	SRMMU_PAGE_SHARED
#define PAGE_COPY	SRMMU_PAGE_COPY
#define PAGE_READONLY	SRMMU_PAGE_RDONLY
#define PAGE_KERNEL	SRMMU_PAGE_KERNEL

/* Top-level page directory - dummy used by init-mm.
 * srmmu.c will assign the real one (which is dynamically sized) */
#define swapper_pg_dir NULL

void paging_init(void);

extern unsigned long ptr_in_current_pgd;

/*         xwr */
#define __P000  PAGE_NONE
#define __P001  PAGE_READONLY
#define __P010  PAGE_COPY
#define __P011  PAGE_COPY
#define __P100  PAGE_READONLY
#define __P101  PAGE_READONLY
#define __P110  PAGE_COPY
#define __P111  PAGE_COPY

#define __S000	PAGE_NONE
#define __S001	PAGE_READONLY
#define __S010	PAGE_SHARED
#define __S011	PAGE_SHARED
#define __S100	PAGE_READONLY
#define __S101	PAGE_READONLY
#define __S110	PAGE_SHARED
#define __S111	PAGE_SHARED

/* First physical page can be anywhere, the following is needed so that
 * va-->pa and vice versa conversions work properly without performance
 * hit for all __pa()/__va() operations.
 */
extern unsigned long phys_base;
extern unsigned long pfn_base;

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
extern unsigned long empty_zero_page;

#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))

/*
 * In general all page table modifications should use the V8 atomic
 * swap instruction.  This insures the mmu and the cpu are in sync
 * with respect to ref/mod bits in the page tables.
 */
static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
{
	__asm__ __volatile__("swap [%2], %0" :
			"=&r" (value) : "0" (value), "r" (addr) : "memory");
	return value;
}

/* Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */

static inline void set_pte(pte_t *ptep, pte_t pteval)
{
	srmmu_swap((unsigned long *)ptep, pte_val(pteval));
}

#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

static inline int srmmu_device_memory(unsigned long x)
{
	return ((x & 0xF0000000) != 0);
}

static inline struct page *pmd_page(pmd_t pmd)
{
	if (srmmu_device_memory(pmd_val(pmd)))
		BUG();
	return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
}

static inline unsigned long pgd_page_vaddr(pgd_t pgd)
{
	if (srmmu_device_memory(pgd_val(pgd))) {
		return ~0;
	} else {
		unsigned long v = pgd_val(pgd) & SRMMU_PTD_PMASK;
		return (unsigned long)__nocache_va(v << 4);
	}
}

static inline int pte_present(pte_t pte)
{
	return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
}

static inline int pte_none(pte_t pte)
{
	return !pte_val(pte);
}

static inline void __pte_clear(pte_t *ptep)
{
	set_pte(ptep, __pte(0));
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	__pte_clear(ptep);
}

static inline int pmd_bad(pmd_t pmd)
{
	return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
}

static inline int pmd_present(pmd_t pmd)
{
	return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
}

static inline int pmd_none(pmd_t pmd)
{
	return !pmd_val(pmd);
}

static inline void pmd_clear(pmd_t *pmdp)
{
	int i;
	for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++)
		set_pte((pte_t *)&pmdp->pmdv[i], __pte(0));
}

static inline int pgd_none(pgd_t pgd)          
{
	return !(pgd_val(pgd) & 0xFFFFFFF);
}

static inline int pgd_bad(pgd_t pgd)
{
	return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
}

static inline int pgd_present(pgd_t pgd)
{
	return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
}

static inline void pgd_clear(pgd_t *pgdp)
{
	set_pte((pte_t *)pgdp, __pte(0));
}

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_write(pte_t pte)
{
	return pte_val(pte) & SRMMU_WRITE;
}

static inline int pte_dirty(pte_t pte)
{
	return pte_val(pte) & SRMMU_DIRTY;
}

static inline int pte_young(pte_t pte)
{
	return pte_val(pte) & SRMMU_REF;
}

static inline int pte_special(pte_t pte)
{
	return 0;
}

static inline pte_t pte_wrprotect(pte_t pte)
{
	return __pte(pte_val(pte) & ~SRMMU_WRITE);
}

static inline pte_t pte_mkclean(pte_t pte)
{
	return __pte(pte_val(pte) & ~SRMMU_DIRTY);
}

static inline pte_t pte_mkold(pte_t pte)
{
	return __pte(pte_val(pte) & ~SRMMU_REF);
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	return __pte(pte_val(pte) | SRMMU_WRITE);
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	return __pte(pte_val(pte) | SRMMU_DIRTY);
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	return __pte(pte_val(pte) | SRMMU_REF);
}

#define pte_mkspecial(pte)    (pte)

#define pfn_pte(pfn, prot)		mk_pte(pfn_to_page(pfn), prot)

static inline unsigned long pte_pfn(pte_t pte)
{
	if (srmmu_device_memory(pte_val(pte))) {
		/* Just return something that will cause
		 * pfn_valid() to return false.  This makes
		 * copy_one_pte() to just directly copy to
		 * PTE over.
		 */
		return ~0UL;
	}
	return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
}

#define pte_page(pte)	pfn_to_page(pte_pfn(pte))

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
{
	return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
}

static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
{
	return __pte(((page) >> 4) | pgprot_val(pgprot));
}

static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
{
	return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
}

#define pgprot_noncached pgprot_noncached
static inline pgprot_t pgprot_noncached(pgprot_t prot)
{
	pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE));
	return prot;
}

static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
		pgprot_val(newprot));
}

#define pgd_index(address) ((address) >> PGDIR_SHIFT)

/* to find an entry in a page-table-directory */
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/* Find an entry in the second-level page table.. */
static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
{
	return (pmd_t *) pgd_page_vaddr(*dir) +
		((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
}

/* Find an entry in the third-level page table.. */
pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address);

/*
 * This shortcut works on sun4m (and sun4d) because the nocache area is static.
 */
#define pte_offset_map(d, a)		pte_offset_kernel(d,a)
#define pte_unmap(pte)		do{}while(0)

struct seq_file;
void mmu_info(struct seq_file *m);

/* Fault handler stuff... */
#define FAULT_CODE_PROT     0x1
#define FAULT_CODE_WRITE    0x2
#define FAULT_CODE_USER     0x4

#define update_mmu_cache(vma, address, ptep) do { } while (0)

void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
                      unsigned long xva, unsigned int len);
void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);

/* Encode and de-code a swap entry */
static inline unsigned long __swp_type(swp_entry_t entry)
{
	return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
}

static inline unsigned long __swp_offset(swp_entry_t entry)
{
	return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
}

static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
{
	return (swp_entry_t) {
		(type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
		| (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
}

#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

static inline unsigned long
__get_phys (unsigned long addr)
{
	switch (sparc_cpu_model){
	case sun4m:
	case sun4d:
		return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
	default:
		return 0;
	}
}

static inline int
__get_iospace (unsigned long addr)
{
	switch (sparc_cpu_model){
	case sun4m:
	case sun4d:
		return (srmmu_get_pte (addr) >> 28);
	default:
		return -1;
	}
}

extern unsigned long *sparc_valid_addr_bitmap;

/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define kern_addr_valid(addr) \
	(test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))

/*
 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 * its high 4 bits.  These macros/functions put it there or get it from there.
 */
#define MK_IOSPACE_PFN(space, pfn)	(pfn | (space << (BITS_PER_LONG - 4)))
#define GET_IOSPACE(pfn)		(pfn >> (BITS_PER_LONG - 4))
#define GET_PFN(pfn)			(pfn & 0x0fffffffUL)

int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
		    unsigned long, pgprot_t);

static inline int io_remap_pfn_range(struct vm_area_struct *vma,
				     unsigned long from, unsigned long pfn,
				     unsigned long size, pgprot_t prot)
{
	unsigned long long offset, space, phys_base;

	offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
	space = GET_IOSPACE(pfn);
	phys_base = offset | (space << 32ULL);

	return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
}
#define io_remap_pfn_range io_remap_pfn_range 

#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
({									  \
	int __changed = !pte_same(*(__ptep), __entry);			  \
	if (__changed) {						  \
		set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
		flush_tlb_page(__vma, __address);			  \
	}								  \
	__changed;							  \
})

#include <asm-generic/pgtable.h>

#endif /* !(__ASSEMBLY__) */

#define VMALLOC_START           _AC(0xfe600000,UL)
#define VMALLOC_END             _AC(0xffc00000,UL)

/* We provide our own get_unmapped_area to cope with VA holes for userland */
#define HAVE_ARCH_UNMAPPED_AREA

/*
 * No page table caches to initialise
 */
#define pgtable_cache_init()	do { } while (0)

#endif /* !(_SPARC_PGTABLE_H) */