diff options
Diffstat (limited to 'arch/m68k/include/asm/sun3_pgtable.h')
| -rw-r--r-- | arch/m68k/include/asm/sun3_pgtable.h | 217 |
1 files changed, 217 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 000000000..c987d5086 --- /dev/null +++ b/arch/m68k/include/asm/sun3_pgtable.h @@ -0,0 +1,217 @@ +/* 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) + +/* + * Page protections for initialising protection_map. The sun3 has only two + * protection settings, valid (implying read and execute) and writeable. These + * are as close as we can get... + */ +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY +#define __P101 PAGE_READONLY +#define __P110 PAGE_COPY +#define __P111 PAGE_COPY + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY +#define __S101 PAGE_READONLY +#define __S110 PAGE_SHARED +#define __S111 PAGE_SHARED + +/* Use these fake page-protections on PMDs. */ +#define SUN3_PMD_VALID (0x00000001) +#define SUN3_PMD_MASK (0x0000003F) +#define SUN3_PMD_MAGIC (0x0000002B) + +#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) + +static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp) +{ + pgd_val(*pgdp) = virt_to_phys(pmdp); +} + +#define __pte_page(pte) \ +((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT)) +#define __pmd_page(pmd) \ +((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 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_page(pmd) virt_to_page(__pmd_page(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; } + +static inline int pgd_none (pgd_t pgd) { return 0; } +static inline int pgd_bad (pgd_t pgd) { return 0; } +static inline int pgd_present (pgd_t pgd) { return 1; } +static inline void pgd_clear (pgd_t *pgdp) {} + + +#define pte_ERROR(e) \ + pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) +#define pmd_ERROR(e) \ + pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_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 int pte_special(pte_t pte) { return 0; } + +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(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; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } + +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; +extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; + +/* Find an entry in a pagetable directory. */ +#define pgd_index(address) ((address) >> PGDIR_SHIFT) + +#define pgd_offset(mm, address) \ +((mm)->pgd + pgd_index(address)) + +/* Find an entry in a kernel pagetable directory. */ +#define pgd_offset_k(address) pgd_offset(&init_mm, address) + +/* Find an entry in the second-level pagetable. */ +static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address) +{ + return (pmd_t *) pgd; +} + +/* Find an entry in the third-level pagetable. */ +#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) +#define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address)) +#define pte_offset_map(pmd, address) ((pte_t *)page_address(pmd_page(*pmd)) + pte_index(address)) +#define pte_unmap(pte) do { } while (0) + +/* Macros to (de)construct the fake PTEs representing swap pages. */ +#define __swp_type(x) ((x).val & 0x7F) +#define __swp_offset(x) (((x).val) >> 7) +#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +#endif /* !__ASSEMBLY__ */ +#endif /* !_SUN3_PGTABLE_H */ |