pgtable.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef __ASM_CSKY_PGTABLE_H
  4#define __ASM_CSKY_PGTABLE_H
  5
  6#include <asm/fixmap.h>
  7#include <asm/memory.h>
  8#include <asm/addrspace.h>
  9#include <abi/pgtable-bits.h>
 10#include <asm-generic/pgtable-nopmd.h>
 11
 12#define PGDIR_SHIFT		22
 13#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
 14#define PGDIR_MASK		(~(PGDIR_SIZE-1))
 15
 16#define USER_PTRS_PER_PGD	(PAGE_OFFSET/PGDIR_SIZE)
 17
 18/*
 19 * C-SKY is two-level paging structure:
 20 */
 21
 22#define PTRS_PER_PGD	(PAGE_SIZE / sizeof(pgd_t))
 23#define PTRS_PER_PMD	1
 24#define PTRS_PER_PTE	(PAGE_SIZE / sizeof(pte_t))
 25
 26#define pte_ERROR(e) \
 27	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
 28#define pgd_ERROR(e) \
 29	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 30
 31#define PFN_PTE_SHIFT	PAGE_SHIFT
 32#define pmd_pfn(pmd)	(pmd_phys(pmd) >> PAGE_SHIFT)
 33#define pmd_page(pmd)	(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 34#define pte_clear(mm, addr, ptep)	set_pte((ptep), \
 35	(((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
 36#define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))
 37#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)
 38#define pte_pfn(x)	((unsigned long)((x).pte_low >> PAGE_SHIFT))
 39#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
 40				| pgprot_val(prot))
 41
 42#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 43#define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 44
 45#define pte_page(x)			pfn_to_page(pte_pfn(x))
 46#define __mk_pte(page_nr, pgprot)	__pte(((page_nr) << PAGE_SHIFT) | \
 47					pgprot_val(pgprot))
 48
 49/*
 50 * C-SKY only has VALID and DIRTY bit in hardware. So we need to use the
 51 * two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED.
 52 */
 53#define _PAGE_BASE	(_PAGE_PRESENT | _PAGE_ACCESSED)
 54
 55#define PAGE_NONE	__pgprot(_PAGE_PROT_NONE)
 56#define PAGE_READ	__pgprot(_PAGE_BASE | _PAGE_READ | \
 57				_CACHE_CACHED)
 58#define PAGE_WRITE	__pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
 59				_CACHE_CACHED)
 60#define PAGE_SHARED PAGE_WRITE
 61
 62#define PAGE_KERNEL	__pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
 63				_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
 64				_PAGE_GLOBAL | \
 65				_CACHE_CACHED)
 66
 67#define _PAGE_IOREMAP		(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
 68				_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
 69				_PAGE_GLOBAL | \
 70				_CACHE_UNCACHED | _PAGE_SO)
 71
 72#define _PAGE_CHG_MASK	(~(unsigned long) \
 73				(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 74				_CACHE_MASK | _PAGE_GLOBAL))
 75
 76#define MAX_SWAPFILES_CHECK() \
 77		BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
 78
 79extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 80#define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page))
 81
 82extern void load_pgd(unsigned long pg_dir);
 83extern pte_t invalid_pte_table[PTRS_PER_PTE];
 84
 85static inline void set_pte(pte_t *p, pte_t pte)
 86{
 87	*p = pte;
 88#if defined(CONFIG_CPU_NEED_TLBSYNC)
 89	dcache_wb_line((u32)p);
 90#endif
 91	/* prevent out of order excution */
 92	smp_mb();
 93}
 94
 95static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 96{
 97	unsigned long ptr;
 98
 99	ptr = pmd_val(pmd);
100
101	return __va(ptr);
102}
103
104#define pmd_phys(pmd) pmd_val(pmd)
105
106static inline void set_pmd(pmd_t *p, pmd_t pmd)
107{
108	*p = pmd;
109#if defined(CONFIG_CPU_NEED_TLBSYNC)
110	dcache_wb_line((u32)p);
111#endif
112	/* prevent specul excute */
113	smp_mb();
114}
115
116
117static inline int pmd_none(pmd_t pmd)
118{
119	return pmd_val(pmd) == __pa(invalid_pte_table);
120}
121
122#define pmd_bad(pmd)	(pmd_val(pmd) & ~PAGE_MASK)
123
124static inline int pmd_present(pmd_t pmd)
125{
126	return (pmd_val(pmd) != __pa(invalid_pte_table));
127}
128
129static inline void pmd_clear(pmd_t *p)
130{
131	pmd_val(*p) = (__pa(invalid_pte_table));
132#if defined(CONFIG_CPU_NEED_TLBSYNC)
133	dcache_wb_line((u32)p);
134#endif
135}
136
137/*
138 * The following only work if pte_present() is true.
139 * Undefined behaviour if not..
140 */
141static inline int pte_read(pte_t pte)
142{
143	return pte.pte_low & _PAGE_READ;
144}
145
146static inline int pte_write(pte_t pte)
147{
148	return (pte).pte_low & _PAGE_WRITE;
149}
150
151static inline int pte_dirty(pte_t pte)
152{
153	return (pte).pte_low & _PAGE_MODIFIED;
154}
155
156static inline int pte_young(pte_t pte)
157{
158	return (pte).pte_low & _PAGE_ACCESSED;
159}
160
161static inline pte_t pte_wrprotect(pte_t pte)
162{
163	pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
164	return pte;
165}
166
167static inline pte_t pte_mkclean(pte_t pte)
168{
169	pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
170	return pte;
171}
172
173static inline pte_t pte_mkold(pte_t pte)
174{
175	pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
176	return pte;
177}
178
179static inline pte_t pte_mkwrite_novma(pte_t pte)
180{
181	pte_val(pte) |= _PAGE_WRITE;
182	if (pte_val(pte) & _PAGE_MODIFIED)
183		pte_val(pte) |= _PAGE_DIRTY;
184	return pte;
185}
186
187static inline pte_t pte_mkdirty(pte_t pte)
188{
189	pte_val(pte) |= _PAGE_MODIFIED;
190	if (pte_val(pte) & _PAGE_WRITE)
191		pte_val(pte) |= _PAGE_DIRTY;
192	return pte;
193}
194
195static inline pte_t pte_mkyoung(pte_t pte)
196{
197	pte_val(pte) |= _PAGE_ACCESSED;
198	if (pte_val(pte) & _PAGE_READ)
199		pte_val(pte) |= _PAGE_VALID;
200	return pte;
201}
202
203static inline bool pte_swp_exclusive(pte_t pte)
204{
205	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
206}
207
208static inline pte_t pte_swp_mkexclusive(pte_t pte)
209{
210	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
211	return pte;
212}
213
214static inline pte_t pte_swp_clear_exclusive(pte_t pte)
215{
216	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
217	return pte;
218}
219
220#define __HAVE_PHYS_MEM_ACCESS_PROT
221struct file;
222extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
223				     unsigned long size, pgprot_t vma_prot);
224
225/*
226 * Macro to make mark a page protection value as "uncacheable".  Note
227 * that "protection" is really a misnomer here as the protection value
228 * contains the memory attribute bits, dirty bits, and various other
229 * bits as well.
230 */
231#define pgprot_noncached pgprot_noncached
232
233static inline pgprot_t pgprot_noncached(pgprot_t _prot)
234{
235	unsigned long prot = pgprot_val(_prot);
236
237	prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
238
239	return __pgprot(prot);
240}
241
242#define pgprot_writecombine pgprot_writecombine
243static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
244{
245	unsigned long prot = pgprot_val(_prot);
246
247	prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
248
249	return __pgprot(prot);
250}
251
252static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
253{
254	return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
255		     (pgprot_val(newprot)));
256}
257
258extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
259extern void paging_init(void);
260
261void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
262		unsigned long address, pte_t *pte, unsigned int nr);
263#define update_mmu_cache(vma, addr, ptep) \
264	update_mmu_cache_range(NULL, vma, addr, ptep, 1)
265
266#endif /* __ASM_CSKY_PGTABLE_H */