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sun3_pgtable.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _SUN3_PGTABLE_H #define _SUN3_PGTABLE_H #include <asm/sun3mmu.h> #ifndef __ASSEMBLY__ #include <asm/virtconvert.h> #include <linux/linkage.h> /* * This file contains all the things which change drastically for the sun3 * pagetable stuff, to avoid making too much of a mess of the generic m68k * `pgtable.h'; this should only be included from the generic file. --m */ /* For virtual address to physical address conversion */ #define VTOP(addr) __pa(addr) #define PTOV(addr) __va(addr) #endif /* !__ASSEMBLY__ */ /* These need to be defined for compatibility although the sun3 doesn't use them */ #define _PAGE_NOCACHE030 0x040 #define _CACHEMASK040 (~0x060) #define _PAGE_NOCACHE_S 0x040 /* Page protection values within PTE. */ #define SUN3_PAGE_VALID (0x80000000) #define SUN3_PAGE_WRITEABLE (0x40000000) #define SUN3_PAGE_SYSTEM (0x20000000) #define SUN3_PAGE_NOCACHE (0x10000000) #define SUN3_PAGE_ACCESSED (0x02000000) #define SUN3_PAGE_MODIFIED (0x01000000) /* Externally used page protection values. */ #define _PAGE_PRESENT (SUN3_PAGE_VALID) #define _PAGE_ACCESSED (SUN3_PAGE_ACCESSED) /* Compound page protection values. */ //todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix... // is it just PAGE_KERNEL and PAGE_SHARED? #define PAGE_NONE __pgprot(SUN3_PAGE_VALID \ | SUN3_PAGE_ACCESSED \ | SUN3_PAGE_NOCACHE) #define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \ | SUN3_PAGE_WRITEABLE \ | SUN3_PAGE_ACCESSED \ | SUN3_PAGE_NOCACHE) #define PAGE_COPY __pgprot(SUN3_PAGE_VALID \ | SUN3_PAGE_ACCESSED \ | SUN3_PAGE_NOCACHE) #define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \ | SUN3_PAGE_ACCESSED \ | SUN3_PAGE_NOCACHE) #define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \ | SUN3_PAGE_WRITEABLE \ | SUN3_PAGE_SYSTEM \ | SUN3_PAGE_NOCACHE \ | SUN3_PAGE_ACCESSED \ | SUN3_PAGE_MODIFIED) #define PAGE_INIT __pgprot(SUN3_PAGE_VALID \ | SUN3_PAGE_WRITEABLE \ | SUN3_PAGE_SYSTEM \ | SUN3_PAGE_NOCACHE) /* Use these fake page-protections on PMDs. */ #define SUN3_PMD_VALID (0x00000001) #define SUN3_PMD_MASK (0x0000003F) #define SUN3_PMD_MAGIC (0x0000002B) /* We borrow bit 6 to store the exclusive marker in swap PTEs. */ #define _PAGE_SWP_EXCLUSIVE 0x040 #ifndef __ASSEMBLY__ /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } #define pmd_set(pmdp,ptep) do {} while (0) #define __pte_page(pte) \ (__va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT)) static inline unsigned long pmd_page_vaddr(pmd_t pmd) { return (unsigned long)__va(pmd_val(pmd) & PAGE_MASK); } static inline int pte_none (pte_t pte) { return !pte_val (pte); } static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; } static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_val (*ptep) = 0; } #define PFN_PTE_SHIFT 0 #define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK) #define pfn_pte(pfn, pgprot) \ ({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; }) #define pte_page(pte) virt_to_page(__pte_page(pte)) #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT) #define pmd_page(pmd) virt_to_page((void *)pmd_page_vaddr(pmd)) static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); } #define pmd_none(pmd) pmd_none2(&(pmd)) //static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; } static inline int pmd_bad2 (pmd_t *pmd) { return 0; } #define pmd_bad(pmd) pmd_bad2(&(pmd)) static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; } /* #define pmd_present(pmd) pmd_present2(&(pmd)) */ #define pmd_present(pmd) (!pmd_none2(&(pmd))) static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; } #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) /* * The following only work if pte_present() is true. * Undefined behaviour if not... * [we have the full set here even if they don't change from m68k] */ static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite_novma(pte_t pte){ pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; } static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; } // use this version when caches work... //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } // until then, use: static inline pte_t pte_mkcache(pte_t pte) { return pte; } extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; /* * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that * are !pte_none() && !pte_present(). * * Format of swap PTEs: * * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 * 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 * 0 <--------------------- offset ----------------> E <- type --> * * E is the exclusive marker that is not stored in swap entries. */ #define __swp_type(x) ((x).val & 0x3f) #define __swp_offset(x) (((x).val) >> 7) #define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \ (((offset) << 7) & ~SUN3_PAGE_VALID)) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; } static inline pte_t pte_swp_mkexclusive(pte_t pte) { pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; return pte; } static inline pte_t pte_swp_clear_exclusive(pte_t pte) { pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; return pte; } #endif /* !__ASSEMBLY__ */ #endif /* !_SUN3_PGTABLE_H */
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