235 lines
8.1 KiB
C
235 lines
8.1 KiB
C
#ifndef _SUN3_PGTABLE_H
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#define _SUN3_PGTABLE_H
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#include <asm/sun3mmu.h>
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#ifndef __ASSEMBLY__
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#include <asm/virtconvert.h>
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#include <linux/linkage.h>
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/*
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* This file contains all the things which change drastically for the sun3
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* pagetable stuff, to avoid making too much of a mess of the generic m68k
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* `pgtable.h'; this should only be included from the generic file. --m
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*/
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/* For virtual address to physical address conversion */
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#define VTOP(addr) __pa(addr)
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#define PTOV(addr) __va(addr)
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#endif /* !__ASSEMBLY__ */
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/* These need to be defined for compatibility although the sun3 doesn't use them */
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#define _PAGE_NOCACHE030 0x040
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#define _CACHEMASK040 (~0x060)
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#define _PAGE_NOCACHE_S 0x040
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/* Page protection values within PTE. */
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#define SUN3_PAGE_VALID (0x80000000)
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#define SUN3_PAGE_WRITEABLE (0x40000000)
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#define SUN3_PAGE_SYSTEM (0x20000000)
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#define SUN3_PAGE_NOCACHE (0x10000000)
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#define SUN3_PAGE_ACCESSED (0x02000000)
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#define SUN3_PAGE_MODIFIED (0x01000000)
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/* Externally used page protection values. */
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#define _PAGE_PRESENT (SUN3_PAGE_VALID)
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#define _PAGE_ACCESSED (SUN3_PAGE_ACCESSED)
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#define PTE_FILE_MAX_BITS 28
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/* Compound page protection values. */
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//todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
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// is it just PAGE_KERNEL and PAGE_SHARED?
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#define PAGE_NONE __pgprot(SUN3_PAGE_VALID \
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| SUN3_PAGE_ACCESSED \
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| SUN3_PAGE_NOCACHE)
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#define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \
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| SUN3_PAGE_WRITEABLE \
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| SUN3_PAGE_ACCESSED \
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| SUN3_PAGE_NOCACHE)
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#define PAGE_COPY __pgprot(SUN3_PAGE_VALID \
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| SUN3_PAGE_ACCESSED \
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| SUN3_PAGE_NOCACHE)
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#define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \
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| SUN3_PAGE_ACCESSED \
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| SUN3_PAGE_NOCACHE)
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#define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \
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| SUN3_PAGE_WRITEABLE \
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| SUN3_PAGE_SYSTEM \
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| SUN3_PAGE_NOCACHE \
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| SUN3_PAGE_ACCESSED \
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| SUN3_PAGE_MODIFIED)
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#define PAGE_INIT __pgprot(SUN3_PAGE_VALID \
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| SUN3_PAGE_WRITEABLE \
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| SUN3_PAGE_SYSTEM \
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| SUN3_PAGE_NOCACHE)
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/*
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* Page protections for initialising protection_map. The sun3 has only two
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* protection settings, valid (implying read and execute) and writeable. These
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* are as close as we can get...
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*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY
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#define __P101 PAGE_READONLY
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#define __P110 PAGE_COPY
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#define __P111 PAGE_COPY
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY
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#define __S101 PAGE_READONLY
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#define __S110 PAGE_SHARED
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#define __S111 PAGE_SHARED
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/* Use these fake page-protections on PMDs. */
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#define SUN3_PMD_VALID (0x00000001)
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#define SUN3_PMD_MASK (0x0000003F)
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#define SUN3_PMD_MAGIC (0x0000002B)
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#ifndef __ASSEMBLY__
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
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return pte;
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}
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#define pmd_set(pmdp,ptep) do {} while (0)
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static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
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{
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pgd_val(*pgdp) = virt_to_phys(pmdp);
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}
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#define __pte_page(pte) \
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((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
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#define __pmd_page(pmd) \
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((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
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static inline int pte_none (pte_t pte) { return !pte_val (pte); }
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static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
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static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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pte_val (*ptep) = 0;
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}
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#define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
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#define pfn_pte(pfn, pgprot) \
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({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
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#define pte_page(pte) virt_to_page(__pte_page(pte))
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#define pmd_page(pmd) virt_to_page(__pmd_page(pmd))
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static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
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#define pmd_none(pmd) pmd_none2(&(pmd))
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//static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
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static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
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#define pmd_bad(pmd) pmd_bad2(&(pmd))
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static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
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/* #define pmd_present(pmd) pmd_present2(&(pmd)) */
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#define pmd_present(pmd) (!pmd_none2(&(pmd)))
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static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
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static inline int pgd_none (pgd_t pgd) { return 0; }
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static inline int pgd_bad (pgd_t pgd) { return 0; }
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static inline int pgd_present (pgd_t pgd) { return 1; }
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static inline void pgd_clear (pgd_t *pgdp) {}
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not...
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* [we have the full set here even if they don't change from m68k]
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*/
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static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
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static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
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static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
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static inline int pte_special(pte_t pte) { return 0; }
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static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
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static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
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static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
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static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
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static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
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static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
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// use this version when caches work...
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//static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
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// until then, use:
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static inline pte_t pte_mkcache(pte_t pte) { return pte; }
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static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
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/* Find an entry in a pagetable directory. */
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#define pgd_index(address) ((address) >> PGDIR_SHIFT)
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#define pgd_offset(mm, address) \
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((mm)->pgd + pgd_index(address))
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/* Find an entry in a kernel pagetable directory. */
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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/* Find an entry in the second-level pagetable. */
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static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
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{
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return (pmd_t *) pgd;
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}
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static inline unsigned long pte_to_pgoff(pte_t pte)
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{
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return pte.pte & SUN3_PAGE_PGNUM_MASK;
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}
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static inline pte_t pgoff_to_pte(unsigned off)
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{
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pte_t pte = { off + SUN3_PAGE_ACCESSED };
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return pte;
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}
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/* Find an entry in the third-level pagetable. */
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#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
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#define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
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/* FIXME: should we bother with kmap() here? */
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#define pte_offset_map(pmd, address) ((pte_t *)kmap(pmd_page(*pmd)) + pte_index(address))
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#define pte_offset_map_nested(pmd, address) pte_offset_map(pmd, address)
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#define pte_unmap(pte) kunmap(pte)
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#define pte_unmap_nested(pte) kunmap(pte)
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/* Macros to (de)construct the fake PTEs representing swap pages. */
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#define __swp_type(x) ((x).val & 0x7F)
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#define __swp_offset(x) (((x).val) >> 7)
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#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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#endif /* !__ASSEMBLY__ */
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#endif /* !_SUN3_PGTABLE_H */
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