sun3_pgtable.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _SUN3_PGTABLE_H
  3#define _SUN3_PGTABLE_H
  4
  5#include <asm/sun3mmu.h>
  6
  7#ifndef __ASSEMBLER__
  8#include <asm/virtconvert.h>
  9#include <linux/linkage.h>
 10
 11/*
 12 * This file contains all the things which change drastically for the sun3
 13 * pagetable stuff, to avoid making too much of a mess of the generic m68k
 14 * `pgtable.h'; this should only be included from the generic file. --m
 15 */
 16
 17/* For virtual address to physical address conversion */
 18#define VTOP(addr)	__pa(addr)
 19#define PTOV(addr)	__va(addr)
 20
 21
 22#endif	/* !__ASSEMBLER__ */
 23
 24/* These need to be defined for compatibility although the sun3 doesn't use them */
 25#define _PAGE_NOCACHE030 0x040
 26#define _CACHEMASK040   (~0x060)
 27#define _PAGE_NOCACHE_S 0x040
 28
 29/* Page protection values within PTE. */
 30#define SUN3_PAGE_VALID     (0x80000000)
 31#define SUN3_PAGE_WRITEABLE (0x40000000)
 32#define SUN3_PAGE_SYSTEM    (0x20000000)
 33#define SUN3_PAGE_NOCACHE   (0x10000000)
 34#define SUN3_PAGE_ACCESSED  (0x02000000)
 35#define SUN3_PAGE_MODIFIED  (0x01000000)
 36
 37
 38/* Externally used page protection values. */
 39#define _PAGE_PRESENT	(SUN3_PAGE_VALID)
 40#define _PAGE_ACCESSED	(SUN3_PAGE_ACCESSED)
 41
 42/* Compound page protection values. */
 43//todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
 44// is it just PAGE_KERNEL and PAGE_SHARED?
 45#define PAGE_NONE	__pgprot(SUN3_PAGE_VALID \
 46				 | SUN3_PAGE_ACCESSED \
 47				 | SUN3_PAGE_NOCACHE)
 48#define PAGE_SHARED	__pgprot(SUN3_PAGE_VALID \
 49				 | SUN3_PAGE_WRITEABLE \
 50				 | SUN3_PAGE_ACCESSED \
 51				 | SUN3_PAGE_NOCACHE)
 52#define PAGE_COPY	__pgprot(SUN3_PAGE_VALID \
 53				 | SUN3_PAGE_ACCESSED \
 54				 | SUN3_PAGE_NOCACHE)
 55#define PAGE_READONLY	__pgprot(SUN3_PAGE_VALID \
 56				 | SUN3_PAGE_ACCESSED \
 57				 | SUN3_PAGE_NOCACHE)
 58#define PAGE_KERNEL	__pgprot(SUN3_PAGE_VALID \
 59				 | SUN3_PAGE_WRITEABLE \
 60				 | SUN3_PAGE_SYSTEM \
 61				 | SUN3_PAGE_NOCACHE \
 62				 | SUN3_PAGE_ACCESSED \
 63				 | SUN3_PAGE_MODIFIED)
 64#define PAGE_INIT	__pgprot(SUN3_PAGE_VALID \
 65				 | SUN3_PAGE_WRITEABLE \
 66				 | SUN3_PAGE_SYSTEM \
 67				 | SUN3_PAGE_NOCACHE)
 68
 69/* Use these fake page-protections on PMDs. */
 70#define SUN3_PMD_VALID	(0x00000001)
 71#define SUN3_PMD_MASK	(0x0000003F)
 72#define SUN3_PMD_MAGIC	(0x0000002B)
 73
 74/* We borrow bit 6 to store the exclusive marker in swap PTEs. */
 75#define _PAGE_SWP_EXCLUSIVE	0x040
 76
 77#ifndef __ASSEMBLER__
 78
 79static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 80{
 81	pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
 82	return pte;
 83}
 84
 85#define pmd_set(pmdp,ptep) do {} while (0)
 86
 87#define __pte_page(pte) \
 88(__va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
 89
 90static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 91{
 92	return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK);
 93}
 94
 95static inline int pte_none (pte_t pte) { return !pte_val (pte); }
 96static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
 97static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 98{
 99	pte_val (*ptep) = 0;
100}
101
102#define PFN_PTE_SHIFT		0
103#define pte_pfn(pte)            (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
104#define pfn_pte(pfn, pgprot) \
105({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
106
107#define pte_page(pte)		virt_to_page(__pte_page(pte))
108#define pmd_pfn(pmd)		(pmd_val(pmd) >> PAGE_SHIFT)
109#define pmd_page(pmd)		virt_to_page((void *)pmd_page_vaddr(pmd))
110
111
112static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
113#define pmd_none(pmd) pmd_none2(&(pmd))
114//static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
115static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
116#define pmd_bad(pmd) pmd_bad2(&(pmd))
117static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
118/* #define pmd_present(pmd) pmd_present2(&(pmd)) */
119#define pmd_present(pmd) (!pmd_none2(&(pmd)))
120static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
121
122
123#define pte_ERROR(e) \
124	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
125#define pgd_ERROR(e) \
126	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
127
128
129/*
130 * The following only work if pte_present() is true.
131 * Undefined behaviour if not...
132 * [we have the full set here even if they don't change from m68k]
133 */
134static inline int pte_write(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
135static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_MODIFIED; }
136static inline int pte_young(pte_t pte)		{ return pte_val(pte) & SUN3_PAGE_ACCESSED; }
137
138static inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
139static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
140static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
141static inline pte_t pte_mkwrite_novma(pte_t pte){ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
142static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
143static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
144static inline pte_t pte_mknocache(pte_t pte)	{ pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
145// use this version when caches work...
146//static inline pte_t pte_mkcache(pte_t pte)	{ pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
147// until then, use:
148static inline pte_t pte_mkcache(pte_t pte)	{ return pte; }
149
150extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
151extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
152
153/*
154 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
155 * are !pte_none() && !pte_present().
156 *
157 * Format of swap PTEs:
158 *
159 *   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
160 *   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
161 *   0 <--------------------- offset ----------------> E <- type -->
162 *
163 *   E is the exclusive marker that is not stored in swap entries.
164 */
165#define __swp_type(x)		((x).val & 0x3f)
166#define __swp_offset(x)		(((x).val) >> 7)
167#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \
168						   (((offset) << 7) & ~SUN3_PAGE_VALID)) })
169#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
170#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
171
172static inline bool pte_swp_exclusive(pte_t pte)
173{
174	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
175}
176
177static inline pte_t pte_swp_mkexclusive(pte_t pte)
178{
179	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
180	return pte;
181}
182
183static inline pte_t pte_swp_clear_exclusive(pte_t pte)
184{
185	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
186	return pte;
187}
188
189#endif	/* !__ASSEMBLER__ */
190#endif	/* !_SUN3_PGTABLE_H */