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-rw-r--r--include/asm-s390/pgtable.h1093
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diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
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--- a/include/asm-s390/pgtable.h
+++ /dev/null
@@ -1,1093 +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
-
-/*
- * 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 <linux/sched.h>
-#include <linux/mm_types.h>
-#include <asm/bitops.h>
-#include <asm/bug.h>
-#include <asm/processor.h>
-
-extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096)));
-extern void paging_init(void);
-extern void vmem_map_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 20
-# define PUD_SHIFT 20
-# define PGDIR_SHIFT 20
-#else /* __s390x__ */
-# define PMD_SHIFT 20
-# define PUD_SHIFT 31
-# define PGDIR_SHIFT 42
-#endif /* __s390x__ */
-
-#define PMD_SIZE (1UL << PMD_SHIFT)
-#define PMD_MASK (~(PMD_SIZE-1))
-#define PUD_SIZE (1UL << PUD_SHIFT)
-#define PUD_MASK (~(PUD_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
- */
-#define PTRS_PER_PTE 256
-#ifndef __s390x__
-#define PTRS_PER_PMD 1
-#define PTRS_PER_PUD 1
-#else /* __s390x__ */
-#define PTRS_PER_PMD 2048
-#define PTRS_PER_PUD 2048
-#endif /* __s390x__ */
-#define PTRS_PER_PGD 2048
-
-#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 pud_ERROR(e) \
- printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e))
-#define pgd_ERROR(e) \
- printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e))
-
-#ifndef __ASSEMBLY__
-/*
- * The vmalloc area will always be on the topmost area of the kernel
- * mapping. We reserve 96MB (31bit) / 1GB (64bit) for vmalloc,
- * which should be enough for any sane case.
- * By putting vmalloc at the top, we maximise the gap between physical
- * memory and vmalloc to catch misplaced memory accesses. As a side
- * effect, this also makes sure that 64 bit module code cannot be used
- * as system call address.
- */
-#ifndef __s390x__
-#define VMALLOC_START 0x78000000UL
-#define VMALLOC_END 0x7e000000UL
-#define VMEM_MAP_END 0x80000000UL
-#else /* __s390x__ */
-#define VMALLOC_START 0x3e000000000UL
-#define VMALLOC_END 0x3e040000000UL
-#define VMEM_MAP_END 0x40000000000UL
-#endif /* __s390x__ */
-
-/*
- * VMEM_MAX_PHYS is the highest physical address that can be added to the 1:1
- * mapping. This needs to be calculated at compile time since the size of the
- * VMEM_MAP is static but the size of struct page can change.
- */
-#define VMEM_MAX_PAGES ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page))
-#define VMEM_MAX_PFN min(VMALLOC_START >> PAGE_SHIFT, VMEM_MAX_PAGES)
-#define VMEM_MAX_PHYS ((VMEM_MAX_PFN << PAGE_SHIFT) & ~((16 << 20) - 1))
-#define vmemmap ((struct page *) VMALLOC_END)
-
-/*
- * 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 length
- *
- * 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 bit */
-#define _PAGE_INVALID 0x400 /* HW invalid bit */
-
-/* Software bits in the page table entry */
-#define _PAGE_SWT 0x001 /* SW pte type bit t */
-#define _PAGE_SWX 0x002 /* SW pte type bit x */
-#define _PAGE_SPECIAL 0x004 /* SW associated with special page */
-#define __HAVE_ARCH_PTE_SPECIAL
-
-/* Set of bits not changed in pte_modify */
-#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL)
-
-/* Six different types of pages. */
-#define _PAGE_TYPE_EMPTY 0x400
-#define _PAGE_TYPE_NONE 0x401
-#define _PAGE_TYPE_SWAP 0x403
-#define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */
-#define _PAGE_TYPE_RO 0x200
-#define _PAGE_TYPE_RW 0x000
-#define _PAGE_TYPE_EX_RO 0x202
-#define _PAGE_TYPE_EX_RW 0x002
-
-/*
- * Only four types for huge pages, using the invalid bit and protection bit
- * of a segment table entry.
- */
-#define _HPAGE_TYPE_EMPTY 0x020 /* _SEGMENT_ENTRY_INV */
-#define _HPAGE_TYPE_NONE 0x220
-#define _HPAGE_TYPE_RO 0x200 /* _SEGMENT_ENTRY_RO */
-#define _HPAGE_TYPE_RW 0x000
-
-/*
- * PTE type bits are rather complicated. handle_pte_fault uses pte_present,
- * pte_none and pte_file to find out the pte type WITHOUT holding the page
- * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to
- * invalidate a given pte. ipte sets the hw invalid bit and clears all tlbs
- * for the page. The page table entry is set to _PAGE_TYPE_EMPTY afterwards.
- * This change is done while holding the lock, but the intermediate step
- * of a previously valid pte with the hw invalid bit set can be observed by
- * handle_pte_fault. That makes it necessary that all valid pte types with
- * the hw invalid bit set must be distinguishable from the four pte types
- * empty, none, swap and file.
- *
- * irxt ipte irxt
- * _PAGE_TYPE_EMPTY 1000 -> 1000
- * _PAGE_TYPE_NONE 1001 -> 1001
- * _PAGE_TYPE_SWAP 1011 -> 1011
- * _PAGE_TYPE_FILE 11?1 -> 11?1
- * _PAGE_TYPE_RO 0100 -> 1100
- * _PAGE_TYPE_RW 0000 -> 1000
- * _PAGE_TYPE_EX_RO 0110 -> 1110
- * _PAGE_TYPE_EX_RW 0010 -> 1010
- *
- * pte_none is true for bits combinations 1000, 1010, 1100, 1110
- * pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001
- * pte_file is true for bits combinations 1101, 1111
- * swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid.
- */
-
-/* Page status table bits for virtualization */
-#define RCP_PCL_BIT 55
-#define RCP_HR_BIT 54
-#define RCP_HC_BIT 53
-#define RCP_GR_BIT 50
-#define RCP_GC_BIT 49
-
-#ifndef __s390x__
-
-/* Bits in the segment table address-space-control-element */
-#define _ASCE_SPACE_SWITCH 0x80000000UL /* space switch event */
-#define _ASCE_ORIGIN_MASK 0x7ffff000UL /* segment table origin */
-#define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
-#define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
-#define _ASCE_TABLE_LENGTH 0x7f /* 128 x 64 entries = 8k */
-
-/* Bits in the segment table entry */
-#define _SEGMENT_ENTRY_ORIGIN 0x7fffffc0UL /* page table origin */
-#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
-#define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */
-#define _SEGMENT_ENTRY_PTL 0x0f /* page table length */
-
-#define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL)
-#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
-
-#else /* __s390x__ */
-
-/* Bits in the segment/region table address-space-control-element */
-#define _ASCE_ORIGIN ~0xfffUL/* segment table origin */
-#define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
-#define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
-#define _ASCE_SPACE_SWITCH 0x40 /* space switch event */
-#define _ASCE_REAL_SPACE 0x20 /* real space control */
-#define _ASCE_TYPE_MASK 0x0c /* asce table type mask */
-#define _ASCE_TYPE_REGION1 0x0c /* region first table type */
-#define _ASCE_TYPE_REGION2 0x08 /* region second table type */
-#define _ASCE_TYPE_REGION3 0x04 /* region third table type */
-#define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */
-#define _ASCE_TABLE_LENGTH 0x03 /* region table length */
-
-/* Bits in the region table entry */
-#define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */
-#define _REGION_ENTRY_INV 0x20 /* invalid region table entry */
-#define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */
-#define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */
-#define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */
-#define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */
-#define _REGION_ENTRY_LENGTH 0x03 /* region third length */
-
-#define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH)
-#define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INV)
-#define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH)
-#define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INV)
-#define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
-#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
-
-/* Bits in the segment table entry */
-#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
-#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
-#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
-
-#define _SEGMENT_ENTRY (0)
-#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
-
-#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
-#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
-
-#endif /* __s390x__ */
-
-/*
- * A user page table pointer has the space-switch-event bit, the
- * private-space-control bit and the storage-alteration-event-control
- * bit set. A kernel page table pointer doesn't need them.
- */
-#define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \
- _ASCE_ALT_EVENT)
-
-/* Bits int the storage key */
-#define _PAGE_CHANGED 0x02 /* HW changed bit */
-#define _PAGE_REFERENCED 0x04 /* HW referenced bit */
-
-/*
- * Page protection definitions.
- */
-#define PAGE_NONE __pgprot(_PAGE_TYPE_NONE)
-#define PAGE_RO __pgprot(_PAGE_TYPE_RO)
-#define PAGE_RW __pgprot(_PAGE_TYPE_RW)
-#define PAGE_EX_RO __pgprot(_PAGE_TYPE_EX_RO)
-#define PAGE_EX_RW __pgprot(_PAGE_TYPE_EX_RW)
-
-#define PAGE_KERNEL PAGE_RW
-#define PAGE_COPY PAGE_RO
-
-/*
- * Dependent on the EXEC_PROTECT option s390 can do execute protection.
- * Write permission always implies read permission. In theory with a
- * primary/secondary page table execute only can be implemented but
- * it would cost an additional bit in the pte to distinguish all the
- * different pte types. To avoid that execute permission currently
- * implies read permission as well.
- */
- /*xwr*/
-#define __P000 PAGE_NONE
-#define __P001 PAGE_RO
-#define __P010 PAGE_RO
-#define __P011 PAGE_RO
-#define __P100 PAGE_EX_RO
-#define __P101 PAGE_EX_RO
-#define __P110 PAGE_EX_RO
-#define __P111 PAGE_EX_RO
-
-#define __S000 PAGE_NONE
-#define __S001 PAGE_RO
-#define __S010 PAGE_RW
-#define __S011 PAGE_RW
-#define __S100 PAGE_EX_RO
-#define __S101 PAGE_EX_RO
-#define __S110 PAGE_EX_RW
-#define __S111 PAGE_EX_RW
-
-#ifndef __s390x__
-# define PxD_SHADOW_SHIFT 1
-#else /* __s390x__ */
-# define PxD_SHADOW_SHIFT 2
-#endif /* __s390x__ */
-
-static inline void *get_shadow_table(void *table)
-{
- unsigned long addr, offset;
- struct page *page;
-
- addr = (unsigned long) table;
- offset = addr & ((PAGE_SIZE << PxD_SHADOW_SHIFT) - 1);
- page = virt_to_page((void *)(addr ^ offset));
- return (void *)(addr_t)(page->index ? (page->index | offset) : 0UL);
-}
-
-/*
- * Certain architectures need to do special things when PTEs
- * within a page table are directly modified. Thus, the following
- * hook is made available.
- */
-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep, pte_t entry)
-{
- *ptep = entry;
- if (mm->context.noexec) {
- if (!(pte_val(entry) & _PAGE_INVALID) &&
- (pte_val(entry) & _PAGE_SWX))
- pte_val(entry) |= _PAGE_RO;
- else
- pte_val(entry) = _PAGE_TYPE_EMPTY;
- ptep[PTRS_PER_PTE] = entry;
- }
-}
-
-/*
- * pgd/pmd/pte query functions
- */
-#ifndef __s390x__
-
-static inline int pgd_present(pgd_t pgd) { return 1; }
-static inline int pgd_none(pgd_t pgd) { return 0; }
-static inline int pgd_bad(pgd_t pgd) { return 0; }
-
-static inline int pud_present(pud_t pud) { return 1; }
-static inline int pud_none(pud_t pud) { return 0; }
-static inline int pud_bad(pud_t pud) { return 0; }
-
-#else /* __s390x__ */
-
-static inline int pgd_present(pgd_t pgd)
-{
- if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
- return 1;
- return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
-}
-
-static inline int pgd_none(pgd_t pgd)
-{
- if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
- return 0;
- return (pgd_val(pgd) & _REGION_ENTRY_INV) != 0UL;
-}
-
-static inline int pgd_bad(pgd_t pgd)
-{
- /*
- * With dynamic page table levels the pgd can be a region table
- * entry or a segment table entry. Check for the bit that are
- * invalid for either table entry.
- */
- unsigned long mask =
- ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
- ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
- return (pgd_val(pgd) & mask) != 0;
-}
-
-static inline int pud_present(pud_t pud)
-{
- if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
- return 1;
- return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL;
-}
-
-static inline int pud_none(pud_t pud)
-{
- if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
- return 0;
- return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL;
-}
-
-static inline int pud_bad(pud_t pud)
-{
- /*
- * With dynamic page table levels the pud can be a region table
- * entry or a segment table entry. Check for the bit that are
- * invalid for either table entry.
- */
- unsigned long mask =
- ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
- ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
- return (pud_val(pud) & mask) != 0;
-}
-
-#endif /* __s390x__ */
-
-static inline int pmd_present(pmd_t pmd)
-{
- return (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) != 0UL;
-}
-
-static inline int pmd_none(pmd_t pmd)
-{
- return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) != 0UL;
-}
-
-static inline int pmd_bad(pmd_t pmd)
-{
- unsigned long mask = ~_SEGMENT_ENTRY_ORIGIN & ~_SEGMENT_ENTRY_INV;
- return (pmd_val(pmd) & mask) != _SEGMENT_ENTRY;
-}
-
-static inline int pte_none(pte_t pte)
-{
- return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT);
-}
-
-static inline int pte_present(pte_t pte)
-{
- unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT | _PAGE_SWX;
- return (pte_val(pte) & mask) == _PAGE_TYPE_NONE ||
- (!(pte_val(pte) & _PAGE_INVALID) &&
- !(pte_val(pte) & _PAGE_SWT));
-}
-
-static inline int pte_file(pte_t pte)
-{
- unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT;
- return (pte_val(pte) & mask) == _PAGE_TYPE_FILE;
-}
-
-static inline int pte_special(pte_t pte)
-{
- return (pte_val(pte) & _PAGE_SPECIAL);
-}
-
-#define __HAVE_ARCH_PTE_SAME
-#define pte_same(a,b) (pte_val(a) == pte_val(b))
-
-static inline void rcp_lock(pte_t *ptep)
-{
-#ifdef CONFIG_PGSTE
- unsigned long *pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
- preempt_disable();
- while (test_and_set_bit(RCP_PCL_BIT, pgste))
- ;
-#endif
-}
-
-static inline void rcp_unlock(pte_t *ptep)
-{
-#ifdef CONFIG_PGSTE
- unsigned long *pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
- clear_bit(RCP_PCL_BIT, pgste);
- preempt_enable();
-#endif
-}
-
-/* forward declaration for SetPageUptodate in page-flags.h*/
-static inline void page_clear_dirty(struct page *page);
-#include <linux/page-flags.h>
-
-static inline void ptep_rcp_copy(pte_t *ptep)
-{
-#ifdef CONFIG_PGSTE
- struct page *page = virt_to_page(pte_val(*ptep));
- unsigned int skey;
- unsigned long *pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
-
- skey = page_get_storage_key(page_to_phys(page));
- if (skey & _PAGE_CHANGED)
- set_bit_simple(RCP_GC_BIT, pgste);
- if (skey & _PAGE_REFERENCED)
- set_bit_simple(RCP_GR_BIT, pgste);
- if (test_and_clear_bit_simple(RCP_HC_BIT, pgste))
- SetPageDirty(page);
- if (test_and_clear_bit_simple(RCP_HR_BIT, pgste))
- SetPageReferenced(page);
-#endif
-}
-
-/*
- * query functions pte_write/pte_dirty/pte_young only work if
- * pte_present() is true. Undefined behaviour if not..
- */
-static inline int pte_write(pte_t pte)
-{
- return (pte_val(pte) & _PAGE_RO) == 0;
-}
-
-static 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;
-}
-
-static 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;
-}
-
-/*
- * pgd/pmd/pte modification functions
- */
-
-#ifndef __s390x__
-
-#define pgd_clear(pgd) do { } while (0)
-#define pud_clear(pud) do { } while (0)
-
-#else /* __s390x__ */
-
-static inline void pgd_clear_kernel(pgd_t * pgd)
-{
- if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
- pgd_val(*pgd) = _REGION2_ENTRY_EMPTY;
-}
-
-static inline void pgd_clear(pgd_t * pgd)
-{
- pgd_t *shadow = get_shadow_table(pgd);
-
- pgd_clear_kernel(pgd);
- if (shadow)
- pgd_clear_kernel(shadow);
-}
-
-static inline void pud_clear_kernel(pud_t *pud)
-{
- if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
- pud_val(*pud) = _REGION3_ENTRY_EMPTY;
-}
-
-static inline void pud_clear(pud_t *pud)
-{
- pud_t *shadow = get_shadow_table(pud);
-
- pud_clear_kernel(pud);
- if (shadow)
- pud_clear_kernel(shadow);
-}
-
-#endif /* __s390x__ */
-
-static inline void pmd_clear_kernel(pmd_t * pmdp)
-{
- pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
-}
-
-static inline void pmd_clear(pmd_t *pmd)
-{
- pmd_t *shadow = get_shadow_table(pmd);
-
- pmd_clear_kernel(pmd);
- if (shadow)
- pmd_clear_kernel(shadow);
-}
-
-static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
- if (mm->context.pgstes)
- ptep_rcp_copy(ptep);
- pte_val(*ptep) = _PAGE_TYPE_EMPTY;
- if (mm->context.noexec)
- pte_val(ptep[PTRS_PER_PTE]) = _PAGE_TYPE_EMPTY;
-}
-
-/*
- * The following pte modification functions only work if
- * pte_present() is true. Undefined behaviour if not..
- */
-static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
-{
- pte_val(pte) &= _PAGE_CHG_MASK;
- pte_val(pte) |= pgprot_val(newprot);
- return pte;
-}
-
-static inline pte_t pte_wrprotect(pte_t pte)
-{
- /* Do not clobber _PAGE_TYPE_NONE pages! */
- if (!(pte_val(pte) & _PAGE_INVALID))
- pte_val(pte) |= _PAGE_RO;
- return pte;
-}
-
-static inline pte_t pte_mkwrite(pte_t pte)
-{
- pte_val(pte) &= ~_PAGE_RO;
- return pte;
-}
-
-static 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;
-}
-
-static 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;
-}
-
-static 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;
-}
-
-static 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 pte_t pte_mkspecial(pte_t pte)
-{
- pte_val(pte) |= _PAGE_SPECIAL;
- return pte;
-}
-
-#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
-{
-#ifdef CONFIG_PGSTE
- unsigned long physpage;
- int young;
- unsigned long *pgste;
-
- if (!vma->vm_mm->context.pgstes)
- return 0;
- physpage = pte_val(*ptep) & PAGE_MASK;
- pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
-
- young = ((page_get_storage_key(physpage) & _PAGE_REFERENCED) != 0);
- rcp_lock(ptep);
- if (young)
- set_bit_simple(RCP_GR_BIT, pgste);
- young |= test_and_clear_bit_simple(RCP_HR_BIT, pgste);
- rcp_unlock(ptep);
- return young;
-#endif
- return 0;
-}
-
-#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
- unsigned long address, pte_t *ptep)
-{
- /* No need to flush TLB
- * On s390 reference bits are in storage key and never in TLB
- * With virtualization we handle the reference bit, without we
- * we can simply return */
-#ifdef CONFIG_PGSTE
- return ptep_test_and_clear_young(vma, address, ptep);
-#endif
- return 0;
-}
-
-static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
-{
- if (!(pte_val(*ptep) & _PAGE_INVALID)) {
-#ifndef __s390x__
- /* pto must point to the start of the segment table */
- pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
-#else
- /* ipte in zarch mode can do the math */
- pte_t *pto = ptep;
-#endif
- asm volatile(
- " ipte %2,%3"
- : "=m" (*ptep) : "m" (*ptep),
- "a" (pto), "a" (address));
- }
-}
-
-static inline void ptep_invalidate(struct mm_struct *mm,
- unsigned long address, pte_t *ptep)
-{
- if (mm->context.pgstes) {
- rcp_lock(ptep);
- __ptep_ipte(address, ptep);
- ptep_rcp_copy(ptep);
- pte_val(*ptep) = _PAGE_TYPE_EMPTY;
- rcp_unlock(ptep);
- return;
- }
- __ptep_ipte(address, ptep);
- pte_val(*ptep) = _PAGE_TYPE_EMPTY;
- if (mm->context.noexec) {
- __ptep_ipte(address, ptep + PTRS_PER_PTE);
- pte_val(*(ptep + PTRS_PER_PTE)) = _PAGE_TYPE_EMPTY;
- }
-}
-
-/*
- * This is hard to understand. ptep_get_and_clear and ptep_clear_flush
- * both clear the TLB for the unmapped pte. The reason is that
- * ptep_get_and_clear is used in common code (e.g. change_pte_range)
- * to modify an active pte. The sequence is
- * 1) ptep_get_and_clear
- * 2) set_pte_at
- * 3) flush_tlb_range
- * On s390 the tlb needs to get flushed with the modification of the pte
- * if the pte is active. The only way how this can be implemented is to
- * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range
- * is a nop.
- */
-#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
-#define ptep_get_and_clear(__mm, __address, __ptep) \
-({ \
- pte_t __pte = *(__ptep); \
- if (atomic_read(&(__mm)->mm_users) > 1 || \
- (__mm) != current->active_mm) \
- ptep_invalidate(__mm, __address, __ptep); \
- else \
- pte_clear((__mm), (__address), (__ptep)); \
- __pte; \
-})
-
-#define __HAVE_ARCH_PTEP_CLEAR_FLUSH
-static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
- unsigned long address, pte_t *ptep)
-{
- pte_t pte = *ptep;
- ptep_invalidate(vma->vm_mm, address, ptep);
- return pte;
-}
-
-/*
- * The batched pte unmap code uses ptep_get_and_clear_full to clear the
- * ptes. Here an optimization is possible. tlb_gather_mmu flushes all
- * tlbs of an mm if it can guarantee that the ptes of the mm_struct
- * cannot be accessed while the batched unmap is running. In this case
- * full==1 and a simple pte_clear is enough. See tlb.h.
- */
-#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
-static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
- unsigned long addr,
- pte_t *ptep, int full)
-{
- pte_t pte = *ptep;
-
- if (full)
- pte_clear(mm, addr, ptep);
- else
- ptep_invalidate(mm, addr, ptep);
- return pte;
-}
-
-#define __HAVE_ARCH_PTEP_SET_WRPROTECT
-#define ptep_set_wrprotect(__mm, __addr, __ptep) \
-({ \
- pte_t __pte = *(__ptep); \
- if (pte_write(__pte)) { \
- if (atomic_read(&(__mm)->mm_users) > 1 || \
- (__mm) != current->active_mm) \
- ptep_invalidate(__mm, __addr, __ptep); \
- set_pte_at(__mm, __addr, __ptep, pte_wrprotect(__pte)); \
- } \
-})
-
-#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
-#define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
-({ \
- int __changed = !pte_same(*(__ptep), __entry); \
- if (__changed) { \
- ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
- set_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
- } \
- __changed; \
-})
-
-/*
- * 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 __HAVE_ARCH_PAGE_TEST_DIRTY
-static inline int page_test_dirty(struct page *page)
-{
- return (page_get_storage_key(page_to_phys(page)) & _PAGE_CHANGED) != 0;
-}
-
-#define __HAVE_ARCH_PAGE_CLEAR_DIRTY
-static inline void page_clear_dirty(struct page *page)
-{
- page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY);
-}
-
-/*
- * Test and clear referenced bit in storage key.
- */
-#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
-static inline int page_test_and_clear_young(struct page *page)
-{
- unsigned long physpage = page_to_phys(page);
- int ccode;
-
- asm volatile(
- " rrbe 0,%1\n"
- " ipm %0\n"
- " srl %0,28\n"
- : "=d" (ccode) : "a" (physpage) : "cc" );
- return 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;
-}
-
-static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
-{
- unsigned long physpage = page_to_phys(page);
-
- return mk_pte_phys(physpage, pgprot);
-}
-
-#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
-#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
-#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
-#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
-
-#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-
-#ifndef __s390x__
-
-#define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
-#define pud_deref(pmd) ({ BUG(); 0UL; })
-#define pgd_deref(pmd) ({ BUG(); 0UL; })
-
-#define pud_offset(pgd, address) ((pud_t *) pgd)
-#define pmd_offset(pud, address) ((pmd_t *) pud + pmd_index(address))
-
-#else /* __s390x__ */
-
-#define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
-#define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN)
-#define pgd_deref(pgd) (pgd_val(pgd) & _REGION_ENTRY_ORIGIN)
-
-static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
-{
- pud_t *pud = (pud_t *) pgd;
- if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
- pud = (pud_t *) pgd_deref(*pgd);
- return pud + pud_index(address);
-}
-
-static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
-{
- pmd_t *pmd = (pmd_t *) pud;
- if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
- pmd = (pmd_t *) pud_deref(*pud);
- return pmd + pmd_index(address);
-}
-
-#endif /* __s390x__ */
-
-#define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot))
-#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
-#define pte_page(x) pfn_to_page(pte_pfn(x))
-
-#define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
-
-/* Find an entry in the lowest level page table.. */
-#define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
-#define pte_offset_kernel(pmd, address) pte_offset(pmd,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
-static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
-{
- pte_t pte;
- offset &= __SWP_OFFSET_MASK;
- pte_val(pte) = _PAGE_TYPE_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_TYPE_FILE })
-
-#endif /* !__ASSEMBLY__ */
-
-#define kern_addr_valid(addr) (1)
-
-extern int vmem_add_mapping(unsigned long start, unsigned long size);
-extern int vmem_remove_mapping(unsigned long start, unsigned long size);
-extern int s390_enable_sie(void);
-
-/*
- * No page table caches to initialise
- */
-#define pgtable_cache_init() do { } while (0)
-
-#include <asm-generic/pgtable.h>
-
-#endif /* _S390_PAGE_H */