summaryrefslogtreecommitdiff
path: root/arch/cris/include/asm/pgtable.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/cris/include/asm/pgtable.h')
-rw-r--r--arch/cris/include/asm/pgtable.h297
1 files changed, 0 insertions, 297 deletions
diff --git a/arch/cris/include/asm/pgtable.h b/arch/cris/include/asm/pgtable.h
deleted file mode 100644
index 03fca401e23c..000000000000
--- a/arch/cris/include/asm/pgtable.h
+++ /dev/null
@@ -1,297 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * CRIS pgtable.h - macros and functions to manipulate page tables.
- */
-
-#ifndef _CRIS_PGTABLE_H
-#define _CRIS_PGTABLE_H
-
-#include <asm/page.h>
-#define __ARCH_USE_5LEVEL_HACK
-#include <asm-generic/pgtable-nopmd.h>
-
-#ifndef __ASSEMBLY__
-#include <linux/sched/mm.h>
-#include <asm/mmu.h>
-#endif
-#include <arch/pgtable.h>
-
-/*
- * The Linux memory management assumes a three-level page table setup. On
- * CRIS, we use that, but "fold" the mid level into the top-level page
- * table. Since the MMU TLB is software loaded through an interrupt, it
- * supports any page table structure, so we could have used a three-level
- * setup, but for the amounts of memory we normally use, a two-level is
- * probably more efficient.
- *
- * This file contains the functions and defines necessary to modify and use
- * the CRIS page table tree.
- */
-#ifndef __ASSEMBLY__
-extern void paging_init(void);
-#endif
-
-/* Certain architectures need to do special things when pte's
- * within a page table are directly modified. Thus, the following
- * hook is made available.
- */
-#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
-
-/*
- * (pmds are folded into pgds so this doesn't get actually called,
- * but the define is needed for a generic inline function.)
- */
-#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
-#define set_pgu(pudptr, pudval) (*(pudptr) = pudval)
-
-/* PGDIR_SHIFT determines the size of the area a second-level page table can
- * map. It is equal to the page size times the number of PTE's that fit in
- * a PMD page. A PTE is 4-bytes in CRIS. Hence the following number.
- */
-
-#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-2))
-#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
-#define PGDIR_MASK (~(PGDIR_SIZE-1))
-
-/*
- * entries per page directory level: we use a two-level, so
- * we don't really have any PMD directory physically.
- * pointers are 4 bytes so we can use the page size and
- * divide it by 4 (shift by 2).
- */
-#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-2))
-#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-2))
-
-/* calculate how many PGD entries a user-level program can use
- * the first mappable virtual address is 0
- * (TASK_SIZE is the maximum virtual address space)
- */
-
-#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
-
-/* zero page used for uninitialized stuff */
-#ifndef __ASSEMBLY__
-extern unsigned long empty_zero_page;
-#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
-#endif
-
-/* number of bits that fit into a memory pointer */
-#define BITS_PER_PTR (8*sizeof(unsigned long))
-
-/* to align the pointer to a pointer address */
-#define PTR_MASK (~(sizeof(void*)-1))
-
-/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
-/* 64-bit machines, beware! SRB. */
-#define SIZEOF_PTR_LOG2 2
-
-/* to find an entry in a page-table */
-#define PAGE_PTR(address) \
-((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
-
-/* to set the page-dir */
-#define SET_PAGE_DIR(tsk,pgdir)
-
-#define pte_none(x) (!pte_val(x))
-#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
-#define pte_clear(mm,addr,xp) do { pte_val(*(xp)) = 0; } while (0)
-
-#define pmd_none(x) (!pmd_val(x))
-/* by removing the _PAGE_KERNEL bit from the comparison, the same pmd_bad
- * works for both _PAGE_TABLE and _KERNPG_TABLE pmd entries.
- */
-#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_KERNEL)) != _PAGE_TABLE)
-#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
-#define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0)
-
-#ifndef __ASSEMBLY__
-
-/*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
- */
-
-static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
-static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
-static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }
-
-static inline pte_t pte_wrprotect(pte_t pte)
-{
- pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
- return pte;
-}
-
-static inline pte_t pte_mkclean(pte_t pte)
-{
- pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
- return pte;
-}
-
-static inline pte_t pte_mkold(pte_t pte)
-{
- pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
- return pte;
-}
-
-static inline pte_t pte_mkwrite(pte_t pte)
-{
- pte_val(pte) |= _PAGE_WRITE;
- if (pte_val(pte) & _PAGE_MODIFIED)
- pte_val(pte) |= _PAGE_SILENT_WRITE;
- return pte;
-}
-
-static inline pte_t pte_mkdirty(pte_t pte)
-{
- pte_val(pte) |= _PAGE_MODIFIED;
- if (pte_val(pte) & _PAGE_WRITE)
- pte_val(pte) |= _PAGE_SILENT_WRITE;
- return pte;
-}
-
-static inline pte_t pte_mkyoung(pte_t pte)
-{
- pte_val(pte) |= _PAGE_ACCESSED;
- if (pte_val(pte) & _PAGE_READ)
- {
- pte_val(pte) |= _PAGE_SILENT_READ;
- if ((pte_val(pte) & (_PAGE_WRITE | _PAGE_MODIFIED)) ==
- (_PAGE_WRITE | _PAGE_MODIFIED))
- pte_val(pte) |= _PAGE_SILENT_WRITE;
- }
- return pte;
-}
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
-/*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- */
-
-/* What actually goes as arguments to the various functions is less than
- * obvious, but a rule of thumb is that struct page's goes as struct page *,
- * really physical DRAM addresses are unsigned long's, and DRAM "virtual"
- * addresses (the 0xc0xxxxxx's) goes as void *'s.
- */
-
-static inline pte_t __mk_pte(void * page, pgprot_t pgprot)
-{
- pte_t pte;
- /* the PTE needs a physical address */
- pte_val(pte) = __pa(page) | pgprot_val(pgprot);
- return pte;
-}
-
-#define mk_pte(page, pgprot) __mk_pte(page_address(page), (pgprot))
-
-#define mk_pte_phys(physpage, pgprot) \
-({ \
- pte_t __pte; \
- \
- pte_val(__pte) = (physpage) + pgprot_val(pgprot); \
- __pte; \
-})
-
-static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
-{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
-
-#define pgprot_noncached(prot) __pgprot((pgprot_val(prot) | _PAGE_NO_CACHE))
-
-
-/* pte_val refers to a page in the 0x4xxxxxxx physical DRAM interval
- * __pte_page(pte_val) refers to the "virtual" DRAM interval
- * pte_pagenr refers to the page-number counted starting from the virtual DRAM start
- */
-
-static inline unsigned long __pte_page(pte_t pte)
-{
- /* the PTE contains a physical address */
- return (unsigned long)__va(pte_val(pte) & PAGE_MASK);
-}
-
-#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
-
-/* permanent address of a page */
-
-#define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT))
-#define pte_page(pte) (mem_map+pte_pagenr(pte))
-
-/* only the pte's themselves need to point to physical DRAM (see above)
- * the pagetable links are purely handled within the kernel SW and thus
- * don't need the __pa and __va transformations.
- */
-
-static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
-{ pmd_val(*pmdp) = _PAGE_TABLE | (unsigned long) ptep; }
-
-#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
-#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
-
-/* to find an entry in a page-table-directory. */
-#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-
-/* to find an entry in a page-table-directory */
-static inline pgd_t * pgd_offset(const struct mm_struct *mm, unsigned long address)
-{
- return mm->pgd + pgd_index(address);
-}
-
-/* to find an entry in a kernel page-table-directory */
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-
-/* Find an entry in the third-level page table.. */
-#define __pte_offset(address) \
- (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
-#define pte_offset_kernel(dir, address) \
- ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
-#define pte_offset_map(dir, address) \
- ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
-
-#define pte_unmap(pte) do { } while (0)
-#define pte_pfn(x) ((unsigned long)(__va((x).pte)) >> PAGE_SHIFT)
-#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
-
-#define pte_ERROR(e) \
- printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
-#define pgd_ERROR(e) \
- printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
-
-
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* defined in head.S */
-
-/*
- * CRIS doesn't have any external MMU info: the kernel page
- * tables contain all the necessary information.
- *
- * Actually I am not sure on what this could be used for.
- */
-static inline void update_mmu_cache(struct vm_area_struct * vma,
- unsigned long address, pte_t *ptep)
-{
-}
-
-/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
-/* Since the PAGE_PRESENT bit is bit 4, we can use the bits above */
-
-#define __swp_type(x) (((x).val >> 5) & 0x7f)
-#define __swp_offset(x) ((x).val >> 12)
-#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 5) | ((offset) << 12) })
-#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
-#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-
-#define kern_addr_valid(addr) (1)
-
-#include <asm-generic/pgtable.h>
-
-/*
- * No page table caches to initialise
- */
-#define pgtable_cache_init() do { } while (0)
-
-typedef pte_t *pte_addr_t;
-
-#endif /* __ASSEMBLY__ */
-#endif /* _CRIS_PGTABLE_H */
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-22 01:28:33 +0300