1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SPARC_PGTABLE_H
3 #define _SPARC_PGTABLE_H
5 /* asm/pgtable.h: Defines and functions used to work
6 * with Sparc page tables.
8 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
12 #include <linux/const.h>
15 #define PMD_SIZE (1UL << PMD_SHIFT)
16 #define PMD_MASK (~(PMD_SIZE-1))
17 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
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)
25 #include <asm-generic/pgtable-nopud.h>
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>
36 struct vm_area_struct;
40 unsigned long calc_highpages(void);
41 unsigned long __init bootmem_init(unsigned long *pages_avail);
43 #define pte_ERROR(e) __builtin_trap()
44 #define pmd_ERROR(e) __builtin_trap()
45 #define pgd_ERROR(e) __builtin_trap()
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)
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
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
64 void paging_init(void);
66 extern unsigned long ptr_in_current_pgd;
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
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
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.
91 extern unsigned long phys_base;
92 extern unsigned long pfn_base;
95 * ZERO_PAGE is a global shared page that is always zero: used
96 * for zero-mapped memory areas etc..
98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
100 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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.
107 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
109 __asm__ __volatile__("swap [%2], %0" :
110 "=&r" (value) : "0" (value), "r" (addr) : "memory");
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.
119 static inline void set_pte(pte_t *ptep, pte_t pteval)
121 srmmu_swap((unsigned long *)ptep, pte_val(pteval));
124 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
126 static inline int srmmu_device_memory(unsigned long x)
128 return ((x & 0xF0000000) != 0);
131 static inline struct page *pmd_page(pmd_t pmd)
133 if (srmmu_device_memory(pmd_val(pmd)))
135 return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
138 static inline unsigned long __pmd_page(pmd_t pmd)
142 if (srmmu_device_memory(pmd_val(pmd)))
145 v = pmd_val(pmd) & SRMMU_PTD_PMASK;
146 return (unsigned long)__nocache_va(v << 4);
149 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
151 unsigned long v = pmd_val(pmd) & SRMMU_PTD_PMASK;
152 return (unsigned long)__nocache_va(v << 4);
155 static inline unsigned long pud_page_vaddr(pud_t pud)
157 if (srmmu_device_memory(pud_val(pud))) {
160 unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK;
161 return (unsigned long)__nocache_va(v << 4);
165 static inline int pte_present(pte_t pte)
167 return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
170 static inline int pte_none(pte_t pte)
172 return !pte_val(pte);
175 static inline void __pte_clear(pte_t *ptep)
177 set_pte(ptep, __pte(0));
180 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
185 static inline int pmd_bad(pmd_t pmd)
187 return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
190 static inline int pmd_present(pmd_t pmd)
192 return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
195 static inline int pmd_none(pmd_t pmd)
197 return !pmd_val(pmd);
200 static inline void pmd_clear(pmd_t *pmdp)
202 set_pte((pte_t *)&pmd_val(*pmdp), __pte(0));
205 static inline int pud_none(pud_t pud)
207 return !(pud_val(pud) & 0xFFFFFFF);
210 static inline int pud_bad(pud_t pud)
212 return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
215 static inline int pud_present(pud_t pud)
217 return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
220 static inline void pud_clear(pud_t *pudp)
222 set_pte((pte_t *)pudp, __pte(0));
226 * The following only work if pte_present() is true.
227 * Undefined behaviour if not..
229 static inline int pte_write(pte_t pte)
231 return pte_val(pte) & SRMMU_WRITE;
234 static inline int pte_dirty(pte_t pte)
236 return pte_val(pte) & SRMMU_DIRTY;
239 static inline int pte_young(pte_t pte)
241 return pte_val(pte) & SRMMU_REF;
244 static inline pte_t pte_wrprotect(pte_t pte)
246 return __pte(pte_val(pte) & ~SRMMU_WRITE);
249 static inline pte_t pte_mkclean(pte_t pte)
251 return __pte(pte_val(pte) & ~SRMMU_DIRTY);
254 static inline pte_t pte_mkold(pte_t pte)
256 return __pte(pte_val(pte) & ~SRMMU_REF);
259 static inline pte_t pte_mkwrite(pte_t pte)
261 return __pte(pte_val(pte) | SRMMU_WRITE);
264 static inline pte_t pte_mkdirty(pte_t pte)
266 return __pte(pte_val(pte) | SRMMU_DIRTY);
269 static inline pte_t pte_mkyoung(pte_t pte)
271 return __pte(pte_val(pte) | SRMMU_REF);
274 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
276 static inline unsigned long pte_pfn(pte_t pte)
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
286 return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
289 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
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.
295 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
297 return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
300 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
302 return __pte(((page) >> 4) | pgprot_val(pgprot));
305 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
307 return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
310 #define pgprot_noncached pgprot_noncached
311 static inline pgprot_t pgprot_noncached(pgprot_t prot)
313 pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE));
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)
320 return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
321 pgprot_val(newprot));
325 void mmu_info(struct seq_file *m);
327 /* Fault handler stuff... */
328 #define FAULT_CODE_PROT 0x1
329 #define FAULT_CODE_WRITE 0x2
330 #define FAULT_CODE_USER 0x4
332 #define update_mmu_cache(vma, address, ptep) do { } while (0)
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);
338 /* Encode and de-code a swap entry */
339 static inline unsigned long __swp_type(swp_entry_t entry)
341 return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
344 static inline unsigned long __swp_offset(swp_entry_t entry)
346 return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
349 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
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 };
356 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
357 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
359 static inline unsigned long
360 __get_phys (unsigned long addr)
362 switch (sparc_cpu_model){
365 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
372 __get_iospace (unsigned long addr)
374 switch (sparc_cpu_model){
377 return (srmmu_get_pte (addr) >> 28);
383 extern unsigned long *sparc_valid_addr_bitmap;
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))
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.
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)
397 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
398 unsigned long, pgprot_t);
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)
404 unsigned long long offset, space, phys_base;
406 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
407 space = GET_IOSPACE(pfn);
408 phys_base = offset | (space << 32ULL);
410 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
412 #define io_remap_pfn_range io_remap_pfn_range
414 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
415 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
417 int __changed = !pte_same(*(__ptep), __entry); \
419 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
420 flush_tlb_page(__vma, __address); \
425 #endif /* !(__ASSEMBLY__) */
427 #define VMALLOC_START _AC(0xfe600000,UL)
428 #define VMALLOC_END _AC(0xffc00000,UL)
430 /* We provide our own get_unmapped_area to cope with VA holes for userland */
431 #define HAVE_ARCH_UNMAPPED_AREA
433 #endif /* !(_SPARC_PGTABLE_H) */