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Diffstat (limited to 'include/asm-s390/pgtable.h')
| -rw-r--r-- | include/asm-s390/pgtable.h | 814 |
1 files changed, 0 insertions, 814 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h deleted file mode 100644 index 9be741bb149..00000000000 --- a/include/asm-s390/pgtable.h +++ /dev/null @@ -1,814 +0,0 @@ -/* - * include/asm-s390/pgtable.h - * - * S390 version - * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation - * Author(s): Hartmut Penner (hp@de.ibm.com) - * Ulrich Weigand (weigand@de.ibm.com) - * Martin Schwidefsky (schwidefsky@de.ibm.com) - * - * Derived from "include/asm-i386/pgtable.h" - */ - -#ifndef _ASM_S390_PGTABLE_H -#define _ASM_S390_PGTABLE_H - -#include <asm-generic/4level-fixup.h> - -/* - * The Linux memory management assumes a three-level page table setup. For - * s390 31 bit we "fold" the mid level into the top-level page table, so - * that we physically have the same two-level page table as the s390 mmu - * expects in 31 bit mode. For s390 64 bit we use three of the five levels - * the hardware provides (region first and region second tables are not - * used). - * - * The "pgd_xxx()" functions are trivial for a folded two-level - * setup: the pgd is never bad, and a pmd always exists (as it's folded - * into the pgd entry) - * - * This file contains the functions and defines necessary to modify and use - * the S390 page table tree. - */ -#ifndef __ASSEMBLY__ -#include <asm/bug.h> -#include <asm/processor.h> -#include <linux/threads.h> - -struct vm_area_struct; /* forward declaration (include/linux/mm.h) */ -struct mm_struct; - -extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096))); -extern void paging_init(void); - -/* - * The S390 doesn't have any external MMU info: the kernel page - * tables contain all the necessary information. - */ -#define update_mmu_cache(vma, address, pte) do { } while (0) - -/* - * ZERO_PAGE is a global shared page that is always zero: used - * for zero-mapped memory areas etc.. - */ -extern char empty_zero_page[PAGE_SIZE]; -#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) -#endif /* !__ASSEMBLY__ */ - -/* - * PMD_SHIFT determines the size of the area a second-level page - * table can map - * PGDIR_SHIFT determines what a third-level page table entry can map - */ -#ifndef __s390x__ -# define PMD_SHIFT 22 -# define PGDIR_SHIFT 22 -#else /* __s390x__ */ -# define PMD_SHIFT 21 -# define PGDIR_SHIFT 31 -#endif /* __s390x__ */ - -#define PMD_SIZE (1UL << PMD_SHIFT) -#define PMD_MASK (~(PMD_SIZE-1)) -#define PGDIR_SIZE (1UL << PGDIR_SHIFT) -#define PGDIR_MASK (~(PGDIR_SIZE-1)) - -/* - * entries per page directory level: the S390 is two-level, so - * we don't really have any PMD directory physically. - * for S390 segment-table entries are combined to one PGD - * that leads to 1024 pte per pgd - */ -#ifndef __s390x__ -# define PTRS_PER_PTE 1024 -# define PTRS_PER_PMD 1 -# define PTRS_PER_PGD 512 -#else /* __s390x__ */ -# define PTRS_PER_PTE 512 -# define PTRS_PER_PMD 1024 -# define PTRS_PER_PGD 2048 -#endif /* __s390x__ */ - -/* - * pgd entries used up by user/kernel: - */ -#ifndef __s390x__ -# define USER_PTRS_PER_PGD 512 -# define USER_PGD_PTRS 512 -# define KERNEL_PGD_PTRS 512 -#else /* __s390x__ */ -# define USER_PTRS_PER_PGD 2048 -# define USER_PGD_PTRS 2048 -# define KERNEL_PGD_PTRS 2048 -#endif /* __s390x__ */ - -#define FIRST_USER_ADDRESS 0 - -#define pte_ERROR(e) \ - printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e)) -#define pmd_ERROR(e) \ - printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e)) -#define pgd_ERROR(e) \ - printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e)) - -#ifndef __ASSEMBLY__ -/* - * Just any arbitrary offset to the start of the vmalloc VM area: the - * current 8MB value just means that there will be a 8MB "hole" after the - * physical memory until the kernel virtual memory starts. That means that - * any out-of-bounds memory accesses will hopefully be caught. - * The vmalloc() routines leaves a hole of 4kB between each vmalloced - * area for the same reason. ;) - */ -#define VMALLOC_OFFSET (8*1024*1024) -#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) \ - & ~(VMALLOC_OFFSET-1)) -#ifndef __s390x__ -# define VMALLOC_END (0x7fffffffL) -#else /* __s390x__ */ -# define VMALLOC_END (0x40000000000L) -#endif /* __s390x__ */ - - -/* - * A 31 bit pagetable entry of S390 has following format: - * | PFRA | | OS | - * 0 0IP0 - * 00000000001111111111222222222233 - * 01234567890123456789012345678901 - * - * I Page-Invalid Bit: Page is not available for address-translation - * P Page-Protection Bit: Store access not possible for page - * - * A 31 bit segmenttable entry of S390 has following format: - * | P-table origin | |PTL - * 0 IC - * 00000000001111111111222222222233 - * 01234567890123456789012345678901 - * - * I Segment-Invalid Bit: Segment is not available for address-translation - * C Common-Segment Bit: Segment is not private (PoP 3-30) - * PTL Page-Table-Length: Page-table length (PTL+1*16 entries -> up to 256) - * - * The 31 bit segmenttable origin of S390 has following format: - * - * |S-table origin | | STL | - * X **GPS - * 00000000001111111111222222222233 - * 01234567890123456789012345678901 - * - * X Space-Switch event: - * G Segment-Invalid Bit: * - * P Private-Space Bit: Segment is not private (PoP 3-30) - * S Storage-Alteration: - * STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048) - * - * A 64 bit pagetable entry of S390 has following format: - * | PFRA |0IP0| OS | - * 0000000000111111111122222222223333333333444444444455555555556666 - * 0123456789012345678901234567890123456789012345678901234567890123 - * - * I Page-Invalid Bit: Page is not available for address-translation - * P Page-Protection Bit: Store access not possible for page - * - * A 64 bit segmenttable entry of S390 has following format: - * | P-table origin | TT - * 0000000000111111111122222222223333333333444444444455555555556666 - * 0123456789012345678901234567890123456789012345678901234567890123 - * - * I Segment-Invalid Bit: Segment is not available for address-translation - * C Common-Segment Bit: Segment is not private (PoP 3-30) - * P Page-Protection Bit: Store access not possible for page - * TT Type 00 - * - * A 64 bit region table entry of S390 has following format: - * | S-table origin | TF TTTL - * 0000000000111111111122222222223333333333444444444455555555556666 - * 0123456789012345678901234567890123456789012345678901234567890123 - * - * I Segment-Invalid Bit: Segment is not available for address-translation - * TT Type 01 - * TF - * TL Table lenght - * - * The 64 bit regiontable origin of S390 has following format: - * | region table origon | DTTL - * 0000000000111111111122222222223333333333444444444455555555556666 - * 0123456789012345678901234567890123456789012345678901234567890123 - * - * X Space-Switch event: - * G Segment-Invalid Bit: - * P Private-Space Bit: - * S Storage-Alteration: - * R Real space - * TL Table-Length: - * - * A storage key has the following format: - * | ACC |F|R|C|0| - * 0 3 4 5 6 7 - * ACC: access key - * F : fetch protection bit - * R : referenced bit - * C : changed bit - */ - -/* Hardware bits in the page table entry */ -#define _PAGE_RO 0x200 /* HW read-only */ -#define _PAGE_INVALID 0x400 /* HW invalid */ - -/* Mask and four different kinds of invalid pages. */ -#define _PAGE_INVALID_MASK 0x601 -#define _PAGE_INVALID_EMPTY 0x400 -#define _PAGE_INVALID_NONE 0x401 -#define _PAGE_INVALID_SWAP 0x600 -#define _PAGE_INVALID_FILE 0x601 - -#ifndef __s390x__ - -/* Bits in the segment table entry */ -#define _PAGE_TABLE_LEN 0xf /* only full page-tables */ -#define _PAGE_TABLE_COM 0x10 /* common page-table */ -#define _PAGE_TABLE_INV 0x20 /* invalid page-table */ -#define _SEG_PRESENT 0x001 /* Software (overlap with PTL) */ - -/* Bits int the storage key */ -#define _PAGE_CHANGED 0x02 /* HW changed bit */ -#define _PAGE_REFERENCED 0x04 /* HW referenced bit */ - -#define _USER_SEG_TABLE_LEN 0x7f /* user-segment-table up to 2 GB */ -#define _KERNEL_SEG_TABLE_LEN 0x7f /* kernel-segment-table up to 2 GB */ - -/* - * User and Kernel pagetables are identical - */ -#define _PAGE_TABLE _PAGE_TABLE_LEN -#define _KERNPG_TABLE _PAGE_TABLE_LEN - -/* - * The Kernel segment-tables includes the User segment-table - */ - -#define _SEGMENT_TABLE (_USER_SEG_TABLE_LEN|0x80000000|0x100) -#define _KERNSEG_TABLE _KERNEL_SEG_TABLE_LEN - -#define USER_STD_MASK 0x00000080UL - -#else /* __s390x__ */ - -/* Bits in the segment table entry */ -#define _PMD_ENTRY_INV 0x20 /* invalid segment table entry */ -#define _PMD_ENTRY 0x00 - -/* Bits in the region third table entry */ -#define _PGD_ENTRY_INV 0x20 /* invalid region table entry */ -#define _PGD_ENTRY 0x07 - -/* - * User and kernel page directory - */ -#define _REGION_THIRD 0x4 -#define _REGION_THIRD_LEN 0x3 -#define _REGION_TABLE (_REGION_THIRD|_REGION_THIRD_LEN|0x40|0x100) -#define _KERN_REGION_TABLE (_REGION_THIRD|_REGION_THIRD_LEN) - -#define USER_STD_MASK 0x0000000000000080UL - -/* Bits in the storage key */ -#define _PAGE_CHANGED 0x02 /* HW changed bit */ -#define _PAGE_REFERENCED 0x04 /* HW referenced bit */ - -#endif /* __s390x__ */ - -/* - * No mapping available - */ -#define PAGE_NONE_SHARED __pgprot(_PAGE_INVALID_NONE) -#define PAGE_NONE_PRIVATE __pgprot(_PAGE_INVALID_NONE) -#define PAGE_RO_SHARED __pgprot(_PAGE_RO) -#define PAGE_RO_PRIVATE __pgprot(_PAGE_RO) -#define PAGE_COPY __pgprot(_PAGE_RO) -#define PAGE_SHARED __pgprot(0) -#define PAGE_KERNEL __pgprot(0) - -/* - * The S390 can't do page protection for execute, and considers that the - * same are read. Also, write permissions imply read permissions. This is - * the closest we can get.. - */ - /*xwr*/ -#define __P000 PAGE_NONE_PRIVATE -#define __P001 PAGE_RO_PRIVATE -#define __P010 PAGE_COPY -#define __P011 PAGE_COPY -#define __P100 PAGE_RO_PRIVATE -#define __P101 PAGE_RO_PRIVATE -#define __P110 PAGE_COPY -#define __P111 PAGE_COPY - -#define __S000 PAGE_NONE_SHARED -#define __S001 PAGE_RO_SHARED -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED -#define __S100 PAGE_RO_SHARED -#define __S101 PAGE_RO_SHARED -#define __S110 PAGE_SHARED -#define __S111 PAGE_SHARED - -/* - * Certain architectures need to do special things when PTEs - * within a page table are directly modified. Thus, the following - * hook is made available. - */ -extern inline void set_pte(pte_t *pteptr, pte_t pteval) -{ - *pteptr = pteval; -} -#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) - -/* - * pgd/pmd/pte query functions - */ -#ifndef __s390x__ - -extern inline int pgd_present(pgd_t pgd) { return 1; } -extern inline int pgd_none(pgd_t pgd) { return 0; } -extern inline int pgd_bad(pgd_t pgd) { return 0; } - -extern inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & _SEG_PRESENT; } -extern inline int pmd_none(pmd_t pmd) { return pmd_val(pmd) & _PAGE_TABLE_INV; } -extern inline int pmd_bad(pmd_t pmd) -{ - return (pmd_val(pmd) & (~PAGE_MASK & ~_PAGE_TABLE_INV)) != _PAGE_TABLE; -} - -#else /* __s390x__ */ - -extern inline int pgd_present(pgd_t pgd) -{ - return (pgd_val(pgd) & ~PAGE_MASK) == _PGD_ENTRY; -} - -extern inline int pgd_none(pgd_t pgd) -{ - return pgd_val(pgd) & _PGD_ENTRY_INV; -} - -extern inline int pgd_bad(pgd_t pgd) -{ - return (pgd_val(pgd) & (~PAGE_MASK & ~_PGD_ENTRY_INV)) != _PGD_ENTRY; -} - -extern inline int pmd_present(pmd_t pmd) -{ - return (pmd_val(pmd) & ~PAGE_MASK) == _PMD_ENTRY; -} - -extern inline int pmd_none(pmd_t pmd) -{ - return pmd_val(pmd) & _PMD_ENTRY_INV; -} - -extern inline int pmd_bad(pmd_t pmd) -{ - return (pmd_val(pmd) & (~PAGE_MASK & ~_PMD_ENTRY_INV)) != _PMD_ENTRY; -} - -#endif /* __s390x__ */ - -extern inline int pte_none(pte_t pte) -{ - return (pte_val(pte) & _PAGE_INVALID_MASK) == _PAGE_INVALID_EMPTY; -} - -extern inline int pte_present(pte_t pte) -{ - return !(pte_val(pte) & _PAGE_INVALID) || - (pte_val(pte) & _PAGE_INVALID_MASK) == _PAGE_INVALID_NONE; -} - -extern inline int pte_file(pte_t pte) -{ - return (pte_val(pte) & _PAGE_INVALID_MASK) == _PAGE_INVALID_FILE; -} - -#define pte_same(a,b) (pte_val(a) == pte_val(b)) - -/* - * query functions pte_write/pte_dirty/pte_young only work if - * pte_present() is true. Undefined behaviour if not.. - */ -extern inline int pte_write(pte_t pte) -{ - return (pte_val(pte) & _PAGE_RO) == 0; -} - -extern inline int pte_dirty(pte_t pte) -{ - /* A pte is neither clean nor dirty on s/390. The dirty bit - * is in the storage key. See page_test_and_clear_dirty for - * details. - */ - return 0; -} - -extern inline int pte_young(pte_t pte) -{ - /* A pte is neither young nor old on s/390. The young bit - * is in the storage key. See page_test_and_clear_young for - * details. - */ - return 0; -} - -extern inline int pte_read(pte_t pte) -{ - /* All pages are readable since we don't use the fetch - * protection bit in the storage key. - */ - return 1; -} - -/* - * pgd/pmd/pte modification functions - */ - -#ifndef __s390x__ - -extern inline void pgd_clear(pgd_t * pgdp) { } - -extern inline void pmd_clear(pmd_t * pmdp) -{ - pmd_val(pmdp[0]) = _PAGE_TABLE_INV; - pmd_val(pmdp[1]) = _PAGE_TABLE_INV; - pmd_val(pmdp[2]) = _PAGE_TABLE_INV; - pmd_val(pmdp[3]) = _PAGE_TABLE_INV; -} - -#else /* __s390x__ */ - -extern inline void pgd_clear(pgd_t * pgdp) -{ - pgd_val(*pgdp) = _PGD_ENTRY_INV | _PGD_ENTRY; -} - -extern inline void pmd_clear(pmd_t * pmdp) -{ - pmd_val(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY; - pmd_val1(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY; -} - -#endif /* __s390x__ */ - -extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) -{ - pte_val(*ptep) = _PAGE_INVALID_EMPTY; -} - -/* - * The following pte modification functions only work if - * pte_present() is true. Undefined behaviour if not.. - */ -extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot) -{ - pte_val(pte) &= PAGE_MASK; - pte_val(pte) |= pgprot_val(newprot); - return pte; -} - -extern inline pte_t pte_wrprotect(pte_t pte) -{ - /* Do not clobber _PAGE_INVALID_NONE pages! */ - if (!(pte_val(pte) & _PAGE_INVALID)) - pte_val(pte) |= _PAGE_RO; - return pte; -} - -extern inline pte_t pte_mkwrite(pte_t pte) -{ - pte_val(pte) &= ~_PAGE_RO; - return pte; -} - -extern inline pte_t pte_mkclean(pte_t pte) -{ - /* The only user of pte_mkclean is the fork() code. - We must *not* clear the *physical* page dirty bit - just because fork() wants to clear the dirty bit in - *one* of the page's mappings. So we just do nothing. */ - return pte; -} - -extern inline pte_t pte_mkdirty(pte_t pte) -{ - /* We do not explicitly set the dirty bit because the - * sske instruction is slow. It is faster to let the - * next instruction set the dirty bit. - */ - return pte; -} - -extern inline pte_t pte_mkold(pte_t pte) -{ - /* S/390 doesn't keep its dirty/referenced bit in the pte. - * There is no point in clearing the real referenced bit. - */ - return pte; -} - -extern inline pte_t pte_mkyoung(pte_t pte) -{ - /* S/390 doesn't keep its dirty/referenced bit in the pte. - * There is no point in setting the real referenced bit. - */ - return pte; -} - -static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) -{ - return 0; -} - -static inline int -ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep) -{ - /* No need to flush TLB; bits are in storage key */ - return ptep_test_and_clear_young(vma, address, ptep); -} - -static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) -{ - return 0; -} - -static inline int -ptep_clear_flush_dirty(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep) -{ - /* No need to flush TLB; bits are in storage key */ - return ptep_test_and_clear_dirty(vma, address, ptep); -} - -static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) -{ - pte_t pte = *ptep; - pte_clear(mm, addr, ptep); - return pte; -} - -static inline pte_t -ptep_clear_flush(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep) -{ - pte_t pte = *ptep; -#ifndef __s390x__ - if (!(pte_val(pte) & _PAGE_INVALID)) { - /* S390 has 1mb segments, we are emulating 4MB segments */ - pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00); - __asm__ __volatile__ ("ipte %2,%3" - : "=m" (*ptep) : "m" (*ptep), - "a" (pto), "a" (address) ); - } -#else /* __s390x__ */ - if (!(pte_val(pte) & _PAGE_INVALID)) - __asm__ __volatile__ ("ipte %2,%3" - : "=m" (*ptep) : "m" (*ptep), - "a" (ptep), "a" (address) ); -#endif /* __s390x__ */ - pte_val(*ptep) = _PAGE_INVALID_EMPTY; - return pte; -} - -static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) -{ - pte_t old_pte = *ptep; - set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte)); -} - -static inline void -ptep_establish(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep, - pte_t entry) -{ - ptep_clear_flush(vma, address, ptep); - set_pte(ptep, entry); -} - -#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ - ptep_establish(__vma, __address, __ptep, __entry) - -/* - * Test and clear dirty bit in storage key. - * We can't clear the changed bit atomically. This is a potential - * race against modification of the referenced bit. This function - * should therefore only be called if it is not mapped in any - * address space. - */ -#define page_test_and_clear_dirty(_page) \ -({ \ - struct page *__page = (_page); \ - unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT); \ - int __skey = page_get_storage_key(__physpage); \ - if (__skey & _PAGE_CHANGED) \ - page_set_storage_key(__physpage, __skey & ~_PAGE_CHANGED);\ - (__skey & _PAGE_CHANGED); \ -}) - -/* - * Test and clear referenced bit in storage key. - */ -#define page_test_and_clear_young(page) \ -({ \ - struct page *__page = (page); \ - unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT); \ - int __ccode; \ - asm volatile ("rrbe 0,%1\n\t" \ - "ipm %0\n\t" \ - "srl %0,28\n\t" \ - : "=d" (__ccode) : "a" (__physpage) : "cc" ); \ - (__ccode & 2); \ -}) - -/* - * Conversion functions: convert a page and protection to a page entry, - * and a page entry and page directory to the page they refer to. - */ -static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) -{ - pte_t __pte; - pte_val(__pte) = physpage + pgprot_val(pgprot); - return __pte; -} - -#define mk_pte(pg, pgprot) \ -({ \ - struct page *__page = (pg); \ - pgprot_t __pgprot = (pgprot); \ - unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT); \ - pte_t __pte = mk_pte_phys(__physpage, __pgprot); \ - __pte; \ -}) - -#define pfn_pte(pfn, pgprot) \ -({ \ - pgprot_t __pgprot = (pgprot); \ - unsigned long __physpage = __pa((pfn) << PAGE_SHIFT); \ - pte_t __pte = mk_pte_phys(__physpage, __pgprot); \ - __pte; \ -}) - -#define SetPageUptodate(_page) \ - do { \ - struct page *__page = (_page); \ - if (!test_and_set_bit(PG_uptodate, &__page->flags)) \ - page_test_and_clear_dirty(_page); \ - } while (0) - -#ifdef __s390x__ - -#define pfn_pmd(pfn, pgprot) \ -({ \ - pgprot_t __pgprot = (pgprot); \ - unsigned long __physpage = __pa((pfn) << PAGE_SHIFT); \ - pmd_t __pmd = __pmd(__physpage + pgprot_val(__pgprot)); \ - __pmd; \ -}) - -#endif /* __s390x__ */ - -#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) -#define pte_page(x) pfn_to_page(pte_pfn(x)) - -#define pmd_page_kernel(pmd) (pmd_val(pmd) & PAGE_MASK) - -#define pmd_page(pmd) (mem_map+(pmd_val(pmd) >> PAGE_SHIFT)) - -#define pgd_page_kernel(pgd) (pgd_val(pgd) & PAGE_MASK) - -/* to find an entry in a page-table-directory */ -#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) -#define pgd_offset(mm, address) ((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) - -#ifndef __s390x__ - -/* Find an entry in the second-level page table.. */ -extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) -{ - return (pmd_t *) dir; -} - -#else /* __s390x__ */ - -/* Find an entry in the second-level page table.. */ -#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) -#define pmd_offset(dir,addr) \ - ((pmd_t *) pgd_page_kernel(*(dir)) + pmd_index(addr)) - -#endif /* __s390x__ */ - -/* Find an entry in the third-level page table.. */ -#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) -#define pte_offset_kernel(pmd, address) \ - ((pte_t *) pmd_page_kernel(*(pmd)) + pte_index(address)) -#define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) -#define pte_offset_map_nested(pmd, address) pte_offset_kernel(pmd, address) -#define pte_unmap(pte) do { } while (0) -#define pte_unmap_nested(pte) do { } while (0) - -/* - * 31 bit swap entry format: - * A page-table entry has some bits we have to treat in a special way. - * Bits 0, 20 and bit 23 have to be zero, otherwise an specification - * exception will occur instead of a page translation exception. The - * specifiation exception has the bad habit not to store necessary - * information in the lowcore. - * Bit 21 and bit 22 are the page invalid bit and the page protection - * bit. We set both to indicate a swapped page. - * Bit 30 and 31 are used to distinguish the different page types. For - * a swapped page these bits need to be zero. - * This leaves the bits 1-19 and bits 24-29 to store type and offset. - * We use the 5 bits from 25-29 for the type and the 20 bits from 1-19 - * plus 24 for the offset. - * 0| offset |0110|o|type |00| - * 0 0000000001111111111 2222 2 22222 33 - * 0 1234567890123456789 0123 4 56789 01 - * - * 64 bit swap entry format: - * A page-table entry has some bits we have to treat in a special way. - * Bits 52 and bit 55 have to be zero, otherwise an specification - * exception will occur instead of a page translation exception. The - * specifiation exception has the bad habit not to store necessary - * information in the lowcore. - * Bit 53 and bit 54 are the page invalid bit and the page protection - * bit. We set both to indicate a swapped page. - * Bit 62 and 63 are used to distinguish the different page types. For - * a swapped page these bits need to be zero. - * This leaves the bits 0-51 and bits 56-61 to store type and offset. - * We use the 5 bits from 57-61 for the type and the 53 bits from 0-51 - * plus 56 for the offset. - * | offset |0110|o|type |00| - * 0000000000111111111122222222223333333333444444444455 5555 5 55566 66 - * 0123456789012345678901234567890123456789012345678901 2345 6 78901 23 - */ -#ifndef __s390x__ -#define __SWP_OFFSET_MASK (~0UL >> 12) -#else -#define __SWP_OFFSET_MASK (~0UL >> 11) -#endif -extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) -{ - pte_t pte; - offset &= __SWP_OFFSET_MASK; - pte_val(pte) = _PAGE_INVALID_SWAP | ((type & 0x1f) << 2) | - ((offset & 1UL) << 7) | ((offset & ~1UL) << 11); - return pte; -} - -#define __swp_type(entry) (((entry).val >> 2) & 0x1f) -#define __swp_offset(entry) (((entry).val >> 11) | (((entry).val >> 7) & 1)) -#define __swp_entry(type,offset) ((swp_entry_t) { pte_val(mk_swap_pte((type),(offset))) }) - -#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) -#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) - -#ifndef __s390x__ -# define PTE_FILE_MAX_BITS 26 -#else /* __s390x__ */ -# define PTE_FILE_MAX_BITS 59 -#endif /* __s390x__ */ - -#define pte_to_pgoff(__pte) \ - ((((__pte).pte >> 12) << 7) + (((__pte).pte >> 1) & 0x7f)) - -#define pgoff_to_pte(__off) \ - ((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \ - | _PAGE_INVALID_FILE }) - -#endif /* !__ASSEMBLY__ */ - -#define kern_addr_valid(addr) (1) - -/* - * No page table caches to initialise - */ -#define pgtable_cache_init() do { } while (0) - -#define __HAVE_ARCH_PTEP_ESTABLISH -#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS -#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG -#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY -#define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH -#define __HAVE_ARCH_PTEP_GET_AND_CLEAR -#define __HAVE_ARCH_PTEP_CLEAR_FLUSH -#define __HAVE_ARCH_PTEP_SET_WRPROTECT -#define __HAVE_ARCH_PTE_SAME -#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY -#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG -#include <asm-generic/pgtable.h> - -#endif /* _S390_PAGE_H */ - |