diff options
Diffstat (limited to 'arch/m68k/include/asm/sun3_pgtable.h')
-rw-r--r-- | arch/m68k/include/asm/sun3_pgtable.h | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h new file mode 100644 index 0000000000..30081aee81 --- /dev/null +++ b/arch/m68k/include/asm/sun3_pgtable.h @@ -0,0 +1,196 @@ +/* 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 */ |