303 lines
7.3 KiB
C
303 lines
7.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MCF_PGTABLE_H
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#define _MCF_PGTABLE_H
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#include <asm/mcfmmu.h>
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#include <asm/page.h>
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/*
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* MMUDR bits, in proper place. We write these directly into the MMUDR
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* after masking from the pte.
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*/
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#define CF_PAGE_LOCKED MMUDR_LK /* 0x00000002 */
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#define CF_PAGE_EXEC MMUDR_X /* 0x00000004 */
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#define CF_PAGE_WRITABLE MMUDR_W /* 0x00000008 */
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#define CF_PAGE_READABLE MMUDR_R /* 0x00000010 */
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#define CF_PAGE_SYSTEM MMUDR_SP /* 0x00000020 */
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#define CF_PAGE_COPYBACK MMUDR_CM_CCB /* 0x00000040 */
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#define CF_PAGE_NOCACHE MMUDR_CM_NCP /* 0x00000080 */
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#define CF_CACHEMASK (~MMUDR_CM_CCB)
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#define CF_PAGE_MMUDR_MASK 0x000000fe
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#define _PAGE_NOCACHE030 CF_PAGE_NOCACHE
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/*
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* MMUTR bits, need shifting down.
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*/
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#define CF_PAGE_MMUTR_MASK 0x00000c00
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#define CF_PAGE_MMUTR_SHIFT 10
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#define CF_PAGE_VALID (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
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#define CF_PAGE_SHARED (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
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/*
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* Fake bits, not implemented in CF, will get masked out before
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* hitting hardware.
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*/
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#define CF_PAGE_DIRTY 0x00000001
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#define CF_PAGE_ACCESSED 0x00001000
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#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
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#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
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#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
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#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
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#define _DESCTYPE_MASK 0x003
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#define _CACHEMASK040 (~0x060)
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#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
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/* We borrow bit 24 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE CF_PAGE_NOCACHE
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/*
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* Externally used page protection values.
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*/
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#define _PAGE_PRESENT (CF_PAGE_VALID)
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#define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
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#define _PAGE_DIRTY (CF_PAGE_DIRTY)
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#define _PAGE_READWRITE (CF_PAGE_READABLE \
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| CF_PAGE_WRITABLE \
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| CF_PAGE_SYSTEM \
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| CF_PAGE_SHARED)
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/*
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* Compound page protection values.
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*/
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#define PAGE_NONE __pgprot(CF_PAGE_VALID \
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| CF_PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(CF_PAGE_VALID \
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| CF_PAGE_ACCESSED \
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| CF_PAGE_SHARED)
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#define PAGE_INIT __pgprot(CF_PAGE_VALID \
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| CF_PAGE_READABLE \
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| CF_PAGE_WRITABLE \
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| CF_PAGE_EXEC \
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| CF_PAGE_SYSTEM)
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#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
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| CF_PAGE_ACCESSED \
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| CF_PAGE_READABLE \
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| CF_PAGE_WRITABLE \
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| CF_PAGE_EXEC \
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| CF_PAGE_SYSTEM \
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| CF_PAGE_SHARED)
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#define PAGE_COPY __pgprot(CF_PAGE_VALID \
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| CF_PAGE_ACCESSED \
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| CF_PAGE_READABLE \
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| CF_PAGE_DIRTY)
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#define PTE_MASK PAGE_MASK
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#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
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#ifndef __ASSEMBLY__
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#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
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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) & CF_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) ((unsigned long) (pte_val(pte) & PAGE_MASK))
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#define pmd_page_vaddr(pmd) ((unsigned long) (pmd_val(pmd)))
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static inline int pte_none(pte_t pte)
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{
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return !pte_val(pte);
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}
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static inline int pte_present(pte_t pte)
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{
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return pte_val(pte) & CF_PAGE_VALID;
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}
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static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
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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_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
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#define pte_page(pte) virt_to_page(__pte_page(pte))
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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_bad2(pmd_t *pmd) { return 0; }
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#define pmd_bad(pmd) pmd_bad2(&(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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#define pte_ERROR(e) \
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printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
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__FILE__, __LINE__, pte_val(e))
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#define pgd_ERROR(e) \
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printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
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__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_read(pte_t pte)
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{
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return pte_val(pte) & CF_PAGE_READABLE;
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}
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static inline int pte_write(pte_t pte)
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{
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return pte_val(pte) & CF_PAGE_WRITABLE;
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}
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static inline int pte_exec(pte_t pte)
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{
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return pte_val(pte) & CF_PAGE_EXEC;
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}
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static inline int pte_dirty(pte_t pte)
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{
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return pte_val(pte) & CF_PAGE_DIRTY;
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}
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static inline int pte_young(pte_t pte)
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{
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return pte_val(pte) & CF_PAGE_ACCESSED;
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}
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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pte_val(pte) &= ~CF_PAGE_WRITABLE;
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return pte;
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}
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static inline pte_t pte_rdprotect(pte_t pte)
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{
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pte_val(pte) &= ~CF_PAGE_READABLE;
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return pte;
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}
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static inline pte_t pte_exprotect(pte_t pte)
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{
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pte_val(pte) &= ~CF_PAGE_EXEC;
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return pte;
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}
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static inline pte_t pte_mkclean(pte_t pte)
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{
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pte_val(pte) &= ~CF_PAGE_DIRTY;
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return pte;
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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pte_val(pte) &= ~CF_PAGE_ACCESSED;
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return pte;
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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pte_val(pte) |= CF_PAGE_WRITABLE;
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return pte;
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}
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static inline pte_t pte_mkread(pte_t pte)
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{
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pte_val(pte) |= CF_PAGE_READABLE;
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return pte;
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}
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static inline pte_t pte_mkexec(pte_t pte)
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{
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pte_val(pte) |= CF_PAGE_EXEC;
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return pte;
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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pte_val(pte) |= CF_PAGE_DIRTY;
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return pte;
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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pte_val(pte) |= CF_PAGE_ACCESSED;
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return pte;
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}
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static inline pte_t pte_mknocache(pte_t pte)
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{
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pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
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return pte;
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}
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static inline pte_t pte_mkcache(pte_t pte)
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{
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pte_val(pte) &= ~CF_PAGE_NOCACHE;
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return pte;
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}
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#define swapper_pg_dir kernel_pg_dir
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extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* Format of swap PTEs:
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*
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* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
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* 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
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* <------------------ offset -------------> 0 0 0 E <-- type --->
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*
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* E is the exclusive marker that is not stored in swap entries.
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*/
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#define __swp_type(x) ((x).val & 0x7f)
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#define __swp_offset(x) ((x).val >> 11)
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#define __swp_entry(typ, off) ((swp_entry_t) { ((typ) & 0x7f) | \
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(off << 11) })
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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((x).val))
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static inline int pte_swp_exclusive(pte_t pte)
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{
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return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
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}
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static inline pte_t pte_swp_mkexclusive(pte_t pte)
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{
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pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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static inline pte_t pte_swp_clear_exclusive(pte_t pte)
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{
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pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
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return pte;
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}
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#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
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#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
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#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
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#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
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#endif /* !__ASSEMBLY__ */
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#endif /* _MCF_PGTABLE_H */
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