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linux_dsm_epyc7002/arch/s390/include/asm/pgtable.h
Martin Schwidefsky 0944fe3f4a s390/mm: implement software referenced bits 
The last remaining use for the storage key of the s390 architecture
is reference counting. The alternative is to make page table entries
invalid while they are old. On access the fault handler marks the
pte/pmd as young which makes the pte/pmd valid if the access rights
allow read access. The pte/pmd invalidations required for software
managed reference bits cost a bit of performance, on the other hand
the RRBE/RRBM instructions to read and reset the referenced bits are
quite expensive as well.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-08-29 13:20:11 +02:00

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/*
* S390 version
* Copyright IBM Corp. 1999, 2000
* 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 <linux/page-flags.h>
#include <asm/bug.h>
#include <asm/page.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, ptep) do { } while (0)
#define update_mmu_cache_pmd(vma, address, ptep) do { } while (0)
/*
* ZERO_PAGE is a global shared page that is always zero; used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;
#define ZERO_PAGE(vaddr) \
(virt_to_page((void *)(empty_zero_page + \
(((unsigned long)(vaddr)) &zero_page_mask))))
#define __HAVE_COLOR_ZERO_PAGE
/* TODO: s390 cannot support io_remap_pfn_range... */
#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 CONFIG_64BIT
# define PMD_SHIFT 20
# define PUD_SHIFT 20
# define PGDIR_SHIFT 20
#else /* CONFIG_64BIT */
# define PMD_SHIFT 20
# define PUD_SHIFT 31
# define PGDIR_SHIFT 42
#endif /* CONFIG_64BIT */
#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 CONFIG_64BIT
#define PTRS_PER_PMD 1
#define PTRS_PER_PUD 1
#else /* CONFIG_64BIT */
#define PTRS_PER_PMD 2048
#define PTRS_PER_PUD 2048
#endif /* CONFIG_64BIT */
#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 and module area will always be on the topmost area of the kernel
* mapping. We reserve 96MB (31bit) / 128GB (64bit) for vmalloc and modules.
* On 64 bit kernels we have a 2GB area at the top of the vmalloc area where
* modules will reside. That makes sure that inter module branches always
* happen without trampolines and in addition the placement within a 2GB frame
* is branch prediction unit friendly.
*/
extern unsigned long VMALLOC_START;
extern unsigned long VMALLOC_END;
extern struct page *vmemmap;
#define VMEM_MAX_PHYS ((unsigned long) vmemmap)
#ifdef CONFIG_64BIT
extern unsigned long MODULES_VADDR;
extern unsigned long MODULES_END;
#define MODULES_VADDR MODULES_VADDR
#define MODULES_END MODULES_END
#define MODULES_LEN (1UL << 31)
#endif
/*
* 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 |0IPC| OS |
* 0000000000111111111122222222223333333333444444444455555555556666
* 0123456789012345678901234567890123456789012345678901234567890123
*
* I Page-Invalid Bit: Page is not available for address-translation
* P Page-Protection Bit: Store access not possible for page
* C Change-bit override: HW is not required to set change bit
*
* 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_CO 0x100 /* HW Change-bit override */
#define _PAGE_PROTECT 0x200 /* HW read-only bit */
#define _PAGE_INVALID 0x400 /* HW invalid bit */
#define _PAGE_LARGE 0x800 /* Bit to mark a large pte */
/* Software bits in the page table entry */
#define _PAGE_PRESENT 0x001 /* SW pte present bit */
#define _PAGE_TYPE 0x002 /* SW pte type bit */
#define _PAGE_YOUNG 0x004 /* SW pte young bit */
#define _PAGE_DIRTY 0x008 /* SW pte dirty bit */
#define _PAGE_READ 0x010 /* SW pte read bit */
#define _PAGE_WRITE 0x020 /* SW pte write bit */
#define _PAGE_SPECIAL 0x040 /* 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 | _PAGE_CO | \
_PAGE_DIRTY | _PAGE_YOUNG)
/*
* handle_pte_fault uses pte_present, pte_none and pte_file to find out the
* pte type WITHOUT holding the page table lock. The _PAGE_PRESENT bit
* is used to distinguish present from not-present ptes. It is changed only
* with the page table lock held.
*
* The following table gives the different possible bit combinations for
* the pte hardware and software bits in the last 12 bits of a pte:
*
* 842100000000
* 000084210000
* 000000008421
* .IR...wrdytp
* empty .10...000000
* swap .10...xxxx10
* file .11...xxxxx0
* prot-none, clean, old .11...000001
* prot-none, clean, young .11...000101
* prot-none, dirty, old .10...001001
* prot-none, dirty, young .10...001101
* read-only, clean, old .11...010001
* read-only, clean, young .01...010101
* read-only, dirty, old .11...011001
* read-only, dirty, young .01...011101
* read-write, clean, old .11...110001
* read-write, clean, young .01...110101
* read-write, dirty, old .10...111001
* read-write, dirty, young .00...111101
*
* pte_present is true for the bit pattern .xx...xxxxx1, (pte & 0x001) == 0x001
* pte_none is true for the bit pattern .10...xxxx00, (pte & 0x603) == 0x400
* pte_file is true for the bit pattern .11...xxxxx0, (pte & 0x601) == 0x600
* pte_swap is true for the bit pattern .10...xxxx10, (pte & 0x603) == 0x402
*/
#ifndef CONFIG_64BIT
/* 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_BITS 0x7fffffffUL /* Valid segment table bits */
#define _SEGMENT_ENTRY_ORIGIN 0x7fffffc0UL /* page table origin */
#define _SEGMENT_ENTRY_PROTECT 0x200 /* page protection bit */
#define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */
#define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */
#define _SEGMENT_ENTRY_PTL 0x0f /* page table length */
#define _SEGMENT_ENTRY_NONE _SEGMENT_ENTRY_PROTECT
#define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL)
#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID)
/*
* Segment table entry encoding (I = invalid, R = read-only bit):
* ..R...I.....
* prot-none ..1...1.....
* read-only ..1...0.....
* read-write ..0...0.....
* empty ..0...1.....
*/
/* Page status table bits for virtualization */
#define PGSTE_ACC_BITS 0xf0000000UL
#define PGSTE_FP_BIT 0x08000000UL
#define PGSTE_PCL_BIT 0x00800000UL
#define PGSTE_HR_BIT 0x00400000UL
#define PGSTE_HC_BIT 0x00200000UL
#define PGSTE_GR_BIT 0x00040000UL
#define PGSTE_GC_BIT 0x00020000UL
#define PGSTE_IN_BIT 0x00008000UL /* IPTE notify bit */
#else /* CONFIG_64BIT */
/* 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_PROTECT 0x200 /* region protection bit */
#define _REGION_ENTRY_INVALID 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_INVALID)
#define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH)
#define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID)
#define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID)
#define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */
#define _REGION3_ENTRY_RO 0x200 /* page protection bit */
#define _REGION3_ENTRY_CO 0x100 /* change-recording override */
/* Bits in the segment table entry */
#define _SEGMENT_ENTRY_BITS 0xfffffffffffffe33UL
#define _SEGMENT_ENTRY_BITS_LARGE 0xfffffffffff1ff33UL
#define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address */
#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
#define _SEGMENT_ENTRY_PROTECT 0x200 /* page protection bit */
#define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */
#define _SEGMENT_ENTRY (0)
#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID)
#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
#define _SEGMENT_ENTRY_SPLIT 0x001 /* THP splitting bit */
#define _SEGMENT_ENTRY_YOUNG 0x002 /* SW segment young bit */
#define _SEGMENT_ENTRY_NONE _SEGMENT_ENTRY_YOUNG
/*
* Segment table entry encoding (R = read-only, I = invalid, y = young bit):
* ..R...I...y.
* prot-none, old ..0...1...1.
* prot-none, young ..1...1...1.
* read-only, old ..1...1...0.
* read-only, young ..1...0...1.
* read-write, old ..0...1...0.
* read-write, young ..0...0...1.
* The segment table origin is used to distinguish empty (origin==0) from
* read-write, old segment table entries (origin!=0)
*/
#define _SEGMENT_ENTRY_SPLIT_BIT 0 /* THP splitting bit number */
/* Set of bits not changed in pmd_modify */
#define _SEGMENT_CHG_MASK (_SEGMENT_ENTRY_ORIGIN | _SEGMENT_ENTRY_LARGE \
| _SEGMENT_ENTRY_SPLIT | _SEGMENT_ENTRY_CO)
/* Page status table bits for virtualization */
#define PGSTE_ACC_BITS 0xf000000000000000UL
#define PGSTE_FP_BIT 0x0800000000000000UL
#define PGSTE_PCL_BIT 0x0080000000000000UL
#define PGSTE_HR_BIT 0x0040000000000000UL
#define PGSTE_HC_BIT 0x0020000000000000UL
#define PGSTE_GR_BIT 0x0004000000000000UL
#define PGSTE_GC_BIT 0x0002000000000000UL
#define PGSTE_IN_BIT 0x0000800000000000UL /* IPTE notify bit */
#endif /* CONFIG_64BIT */
/*
* 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)
/*
* Page protection definitions.
*/
#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_INVALID)
#define PAGE_READ __pgprot(_PAGE_PRESENT | _PAGE_READ | \
_PAGE_INVALID | _PAGE_PROTECT)
#define PAGE_WRITE __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_PAGE_INVALID | _PAGE_PROTECT)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_PAGE_YOUNG | _PAGE_DIRTY)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_PAGE_YOUNG | _PAGE_DIRTY)
#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_YOUNG | \
_PAGE_PROTECT)
/*
* On s390 the page table entry has an invalid bit and a read-only bit.
* Read permission implies execute permission and write permission
* implies read permission.
*/
/*xwr*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READ
#define __P010 PAGE_READ
#define __P011 PAGE_READ
#define __P100 PAGE_READ
#define __P101 PAGE_READ
#define __P110 PAGE_READ
#define __P111 PAGE_READ
#define __S000 PAGE_NONE
#define __S001 PAGE_READ
#define __S010 PAGE_WRITE
#define __S011 PAGE_WRITE
#define __S100 PAGE_READ
#define __S101 PAGE_READ
#define __S110 PAGE_WRITE
#define __S111 PAGE_WRITE
/*
* Segment entry (large page) protection definitions.
*/
#define SEGMENT_NONE __pgprot(_SEGMENT_ENTRY_INVALID | \
_SEGMENT_ENTRY_NONE)
#define SEGMENT_READ __pgprot(_SEGMENT_ENTRY_INVALID | \
_SEGMENT_ENTRY_PROTECT)
#define SEGMENT_WRITE __pgprot(_SEGMENT_ENTRY_INVALID)
static inline int mm_has_pgste(struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
if (unlikely(mm->context.has_pgste))
return 1;
#endif
return 0;
}
/*
* pgd/pmd/pte query functions
*/
#ifndef CONFIG_64BIT
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_large(pud_t pud) { return 0; }
static inline int pud_bad(pud_t pud) { return 0; }
#else /* CONFIG_64BIT */
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_INVALID) != 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_INVALID &
~_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_INVALID) != 0UL;
}
static inline int pud_large(pud_t pud)
{
if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3)
return 0;
return !!(pud_val(pud) & _REGION3_ENTRY_LARGE);
}
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_INVALID &
~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
return (pud_val(pud) & mask) != 0;
}
#endif /* CONFIG_64BIT */
static inline int pmd_present(pmd_t pmd)
{
return pmd_val(pmd) != _SEGMENT_ENTRY_INVALID;
}
static inline int pmd_none(pmd_t pmd)
{
return pmd_val(pmd) == _SEGMENT_ENTRY_INVALID;
}
static inline int pmd_large(pmd_t pmd)
{
#ifdef CONFIG_64BIT
return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0;
#else
return 0;
#endif
}
static inline int pmd_prot_none(pmd_t pmd)
{
return (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) &&
(pmd_val(pmd) & _SEGMENT_ENTRY_NONE);
}
static inline int pmd_bad(pmd_t pmd)
{
#ifdef CONFIG_64BIT
if (pmd_large(pmd))
return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS_LARGE) != 0;
#endif
return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0;
}
#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
extern void pmdp_splitting_flush(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp);
#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
extern int pmdp_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp,
pmd_t entry, int dirty);
#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
#define __HAVE_ARCH_PMD_WRITE
static inline int pmd_write(pmd_t pmd)
{
if (pmd_prot_none(pmd))
return 0;
return (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT) == 0;
}
static inline int pmd_young(pmd_t pmd)
{
int young = 0;
#ifdef CONFIG_64BIT
if (pmd_prot_none(pmd))
young = (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT) != 0;
else
young = (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;
#endif
return young;
}
static inline int pte_present(pte_t pte)
{
/* Bit pattern: (pte & 0x001) == 0x001 */
return (pte_val(pte) & _PAGE_PRESENT) != 0;
}
static inline int pte_none(pte_t pte)
{
/* Bit pattern: pte == 0x400 */
return pte_val(pte) == _PAGE_INVALID;
}
static inline int pte_file(pte_t pte)
{
/* Bit pattern: (pte & 0x601) == 0x600 */
return (pte_val(pte) & (_PAGE_INVALID | _PAGE_PROTECT | _PAGE_PRESENT))
== (_PAGE_INVALID | _PAGE_PROTECT);
}
static inline int pte_special(pte_t pte)
{
return (pte_val(pte) & _PAGE_SPECIAL);
}
#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t a, pte_t b)
{
return pte_val(a) == pte_val(b);
}
static inline pgste_t pgste_get_lock(pte_t *ptep)
{
unsigned long new = 0;
#ifdef CONFIG_PGSTE
unsigned long old;
preempt_disable();
asm(
" lg %0,%2\n"
"0: lgr %1,%0\n"
" nihh %0,0xff7f\n" /* clear PCL bit in old */
" oihh %1,0x0080\n" /* set PCL bit in new */
" csg %0,%1,%2\n"
" jl 0b\n"
: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
: "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");
#endif
return __pgste(new);
}
static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
asm(
" nihh %1,0xff7f\n" /* clear PCL bit */
" stg %1,%0\n"
: "=Q" (ptep[PTRS_PER_PTE])
: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])
: "cc", "memory");
preempt_enable();
#endif
}
static inline pgste_t pgste_get(pte_t *ptep)
{
unsigned long pgste = 0;
#ifdef CONFIG_PGSTE
pgste = *(unsigned long *)(ptep + PTRS_PER_PTE);
#endif
return __pgste(pgste);
}
static inline void pgste_set(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
*(pgste_t *)(ptep + PTRS_PER_PTE) = pgste;
#endif
}
static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
unsigned long address, bits, skey;
if (pte_val(*ptep) & _PAGE_INVALID)
return pgste;
address = pte_val(*ptep) & PAGE_MASK;
skey = (unsigned long) page_get_storage_key(address);
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
if (!(pgste_val(pgste) & PGSTE_HC_BIT) && (bits & _PAGE_CHANGED)) {
/* Transfer dirty + referenced bit to host bits in pgste */
pgste_val(pgste) |= bits << 52;
page_set_storage_key(address, skey ^ bits, 0);
} else if (!(pgste_val(pgste) & PGSTE_HR_BIT) &&
(bits & _PAGE_REFERENCED)) {
/* Transfer referenced bit to host bit in pgste */
pgste_val(pgste) |= PGSTE_HR_BIT;
page_reset_referenced(address);
}
/* Transfer page changed & referenced bit to guest bits in pgste */
pgste_val(pgste) |= bits << 48; /* GR bit & GC bit */
/* Copy page access key and fetch protection bit to pgste */
pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
#endif
return pgste;
}
static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
if (pte_val(*ptep) & _PAGE_INVALID)
return pgste;
/* Get referenced bit from storage key */
if (page_reset_referenced(pte_val(*ptep) & PAGE_MASK))
pgste_val(pgste) |= PGSTE_HR_BIT | PGSTE_GR_BIT;
#endif
return pgste;
}
static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry)
{
#ifdef CONFIG_PGSTE
unsigned long address;
unsigned long nkey;
if (pte_val(entry) & _PAGE_INVALID)
return;
VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
address = pte_val(entry) & PAGE_MASK;
/*
* Set page access key and fetch protection bit from pgste.
* The guest C/R information is still in the PGSTE, set real
* key C/R to 0.
*/
nkey = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
page_set_storage_key(address, nkey, 0);
#endif
}
static inline void pgste_set_pte(pte_t *ptep, pte_t entry)
{
if (!MACHINE_HAS_ESOP && (pte_val(entry) & _PAGE_WRITE)) {
/*
* Without enhanced suppression-on-protection force
* the dirty bit on for all writable ptes.
*/
pte_val(entry) |= _PAGE_DIRTY;
pte_val(entry) &= ~_PAGE_PROTECT;
}
*ptep = entry;
}
/**
* struct gmap_struct - guest address space
* @mm: pointer to the parent mm_struct
* @table: pointer to the page directory
* @asce: address space control element for gmap page table
* @crst_list: list of all crst tables used in the guest address space
*/
struct gmap {
struct list_head list;
struct mm_struct *mm;
unsigned long *table;
unsigned long asce;
void *private;
struct list_head crst_list;
};
/**
* struct gmap_rmap - reverse mapping for segment table entries
* @gmap: pointer to the gmap_struct
* @entry: pointer to a segment table entry
* @vmaddr: virtual address in the guest address space
*/
struct gmap_rmap {
struct list_head list;
struct gmap *gmap;
unsigned long *entry;
unsigned long vmaddr;
};
/**
* struct gmap_pgtable - gmap information attached to a page table
* @vmaddr: address of the 1MB segment in the process virtual memory
* @mapper: list of segment table entries mapping a page table
*/
struct gmap_pgtable {
unsigned long vmaddr;
struct list_head mapper;
};
/**
* struct gmap_notifier - notify function block for page invalidation
* @notifier_call: address of callback function
*/
struct gmap_notifier {
struct list_head list;
void (*notifier_call)(struct gmap *gmap, unsigned long address);
};
struct gmap *gmap_alloc(struct mm_struct *mm);
void gmap_free(struct gmap *gmap);
void gmap_enable(struct gmap *gmap);
void gmap_disable(struct gmap *gmap);
int gmap_map_segment(struct gmap *gmap, unsigned long from,
unsigned long to, unsigned long len);
int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
unsigned long __gmap_translate(unsigned long address, struct gmap *);
unsigned long gmap_translate(unsigned long address, struct gmap *);
unsigned long __gmap_fault(unsigned long address, struct gmap *);
unsigned long gmap_fault(unsigned long address, struct gmap *);
void gmap_discard(unsigned long from, unsigned long to, struct gmap *);
void gmap_register_ipte_notifier(struct gmap_notifier *);
void gmap_unregister_ipte_notifier(struct gmap_notifier *);
int gmap_ipte_notify(struct gmap *, unsigned long start, unsigned long len);
void gmap_do_ipte_notify(struct mm_struct *, unsigned long addr, pte_t *);
static inline pgste_t pgste_ipte_notify(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
if (pgste_val(pgste) & PGSTE_IN_BIT) {
pgste_val(pgste) &= ~PGSTE_IN_BIT;
gmap_do_ipte_notify(mm, addr, ptep);
}
#endif
return pgste;
}
/*
* 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)
{
pgste_t pgste;
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste_set_key(ptep, pgste, entry);
pgste_set_pte(ptep, entry);
pgste_set_unlock(ptep, pgste);
} else {
if (!(pte_val(entry) & _PAGE_INVALID) && MACHINE_HAS_EDAT1)
pte_val(entry) |= _PAGE_CO;
*ptep = entry;
}
}
/*
* 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_WRITE) != 0;
}
static inline int pte_dirty(pte_t pte)
{
return (pte_val(pte) & _PAGE_DIRTY) != 0;
}
static inline int pte_young(pte_t pte)
{
return (pte_val(pte) & _PAGE_YOUNG) != 0;
}
/*
* pgd/pmd/pte modification functions
*/
static inline void pgd_clear(pgd_t *pgd)
{
#ifdef CONFIG_64BIT
if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
pgd_val(*pgd) = _REGION2_ENTRY_EMPTY;
#endif
}
static inline void pud_clear(pud_t *pud)
{
#ifdef CONFIG_64BIT
if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
pud_val(*pud) = _REGION3_ENTRY_EMPTY;
#endif
}
static inline void pmd_clear(pmd_t *pmdp)
{
pmd_val(*pmdp) = _SEGMENT_ENTRY_INVALID;
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_val(*ptep) = _PAGE_INVALID;
}
/*
* 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);
/*
* newprot for PAGE_NONE, PAGE_READ and PAGE_WRITE has the
* invalid bit set, clear it again for readable, young pages
*/
if ((pte_val(pte) & _PAGE_YOUNG) && (pte_val(pte) & _PAGE_READ))
pte_val(pte) &= ~_PAGE_INVALID;
/*
* newprot for PAGE_READ and PAGE_WRITE has the page protection
* bit set, clear it again for writable, dirty pages
*/
if ((pte_val(pte) & _PAGE_DIRTY) && (pte_val(pte) & _PAGE_WRITE))
pte_val(pte) &= ~_PAGE_PROTECT;
return pte;
}
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~_PAGE_WRITE;
pte_val(pte) |= _PAGE_PROTECT;
return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= _PAGE_WRITE;
if (pte_val(pte) & _PAGE_DIRTY)
pte_val(pte) &= ~_PAGE_PROTECT;
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~_PAGE_DIRTY;
pte_val(pte) |= _PAGE_PROTECT;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= _PAGE_DIRTY;
if (pte_val(pte) & _PAGE_WRITE)
pte_val(pte) &= ~_PAGE_PROTECT;
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~_PAGE_YOUNG;
pte_val(pte) |= _PAGE_INVALID;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_YOUNG;
if (pte_val(pte) & _PAGE_READ)
pte_val(pte) &= ~_PAGE_INVALID;
return pte;
}
static inline pte_t pte_mkspecial(pte_t pte)
{
pte_val(pte) |= _PAGE_SPECIAL;
return pte;
}
#ifdef CONFIG_HUGETLB_PAGE
static inline pte_t pte_mkhuge(pte_t pte)
{
pte_val(pte) |= _PAGE_LARGE;
return pte;
}
#endif
/*
* Get (and clear) the user dirty bit for a pte.
*/
static inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm,
pte_t *ptep)
{
pgste_t pgste;
int dirty = 0;
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_update_all(ptep, pgste);
dirty = !!(pgste_val(pgste) & PGSTE_HC_BIT);
pgste_val(pgste) &= ~PGSTE_HC_BIT;
pgste_set_unlock(ptep, pgste);
return dirty;
}
return dirty;
}
/*
* Get (and clear) the user referenced bit for a pte.
*/
static inline int ptep_test_and_clear_user_young(struct mm_struct *mm,
pte_t *ptep)
{
pgste_t pgste;
int young = 0;
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_update_young(ptep, pgste);
young = !!(pgste_val(pgste) & PGSTE_HR_BIT);
pgste_val(pgste) &= ~PGSTE_HR_BIT;
pgste_set_unlock(ptep, pgste);
}
return young;
}
static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
{
if (!(pte_val(*ptep) & _PAGE_INVALID)) {
#ifndef CONFIG_64BIT
/* 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_flush_lazy(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
int active = (mm == current->active_mm) ? 1 : 0;
if (atomic_read(&mm->context.attach_count) > active)
__ptep_ipte(address, ptep);
else
mm->context.flush_mm = 1;
}
#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)
{
pgste_t pgste;
pte_t pte;
int young;
if (mm_has_pgste(vma->vm_mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_ipte_notify(vma->vm_mm, addr, ptep, pgste);
}
pte = *ptep;
__ptep_ipte(addr, ptep);
young = pte_young(pte);
pte = pte_mkold(pte);
if (mm_has_pgste(vma->vm_mm)) {
pgste_set_pte(ptep, pte);
pgste_set_unlock(ptep, pgste);
} else
*ptep = pte;
return young;
}
#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)
{
return ptep_test_and_clear_young(vma, address, ptep);
}
/*
* 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
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
pgste_t pgste;
pte_t pte;
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
}
pte = *ptep;
ptep_flush_lazy(mm, address, ptep);
pte_val(*ptep) = _PAGE_INVALID;
if (mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
pgste_set_unlock(ptep, pgste);
}
return pte;
}
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
unsigned long address,
pte_t *ptep)
{
pgste_t pgste;
pte_t pte;
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste_ipte_notify(mm, address, ptep, pgste);
}
pte = *ptep;
ptep_flush_lazy(mm, address, ptep);
pte_val(*ptep) |= _PAGE_INVALID;
if (mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
pgste_set(ptep, pgste);
}
return pte;
}
static inline void ptep_modify_prot_commit(struct mm_struct *mm,
unsigned long address,
pte_t *ptep, pte_t pte)
{
pgste_t pgste;
if (mm_has_pgste(mm)) {
pgste = pgste_get(ptep);
pgste_set_key(ptep, pgste, pte);
pgste_set_pte(ptep, pte);
pgste_set_unlock(ptep, pgste);
} else
*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)
{
pgste_t pgste;
pte_t pte;
if (mm_has_pgste(vma->vm_mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste);
}
pte = *ptep;
__ptep_ipte(address, ptep);
pte_val(*ptep) = _PAGE_INVALID;
if (mm_has_pgste(vma->vm_mm)) {
pgste = pgste_update_all(&pte, pgste);
pgste_set_unlock(ptep, pgste);
}
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 address,
pte_t *ptep, int full)
{
pgste_t pgste;
pte_t pte;
if (!full && mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
}
pte = *ptep;
if (!full)
ptep_flush_lazy(mm, address, ptep);
pte_val(*ptep) = _PAGE_INVALID;
if (!full && mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
pgste_set_unlock(ptep, pgste);
}
return pte;
}
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
static inline pte_t ptep_set_wrprotect(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
pgste_t pgste;
pte_t pte = *ptep;
if (pte_write(pte)) {
if (mm_has_pgste(mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
}
ptep_flush_lazy(mm, address, ptep);
pte = pte_wrprotect(pte);
if (mm_has_pgste(mm)) {
pgste_set_pte(ptep, pte);
pgste_set_unlock(ptep, pgste);
} else
*ptep = pte;
}
return pte;
}
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
static inline int ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep,
pte_t entry, int dirty)
{
pgste_t pgste;
if (pte_same(*ptep, entry))
return 0;
if (mm_has_pgste(vma->vm_mm)) {
pgste = pgste_get_lock(ptep);
pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste);
}
__ptep_ipte(address, ptep);
if (mm_has_pgste(vma->vm_mm)) {
pgste_set_pte(ptep, entry);
pgste_set_unlock(ptep, pgste);
} else
*ptep = entry;
return 1;
}
/*
* 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_mkyoung(__pte);
}
static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
{
unsigned long physpage = page_to_phys(page);
pte_t __pte = mk_pte_phys(physpage, pgprot);
if (pte_write(__pte) && PageDirty(page))
__pte = pte_mkdirty(__pte);
return __pte;
}
#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 CONFIG_64BIT
#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 /* CONFIG_64BIT */
#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 /* CONFIG_64BIT */
#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_unmap(pte) do { } while (0)
static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
{
unsigned long sto = (unsigned long) pmdp -
pmd_index(address) * sizeof(pmd_t);
if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INVALID)) {
asm volatile(
" .insn rrf,0xb98e0000,%2,%3,0,0"
: "=m" (*pmdp)
: "m" (*pmdp), "a" (sto),
"a" ((address & HPAGE_MASK))
: "cc"
);
}
}
static inline void __pmd_csp(pmd_t *pmdp)
{
register unsigned long reg2 asm("2") = pmd_val(*pmdp);
register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
_SEGMENT_ENTRY_INVALID;
register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
asm volatile(
" csp %1,%3"
: "=m" (*pmdp)
: "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
}
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)
static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
{
/*
* pgprot is PAGE_NONE, PAGE_READ, or PAGE_WRITE (see __Pxxx / __Sxxx)
* Convert to segment table entry format.
*/
if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))
return pgprot_val(SEGMENT_NONE);
if (pgprot_val(pgprot) == pgprot_val(PAGE_READ))
return pgprot_val(SEGMENT_READ);
return pgprot_val(SEGMENT_WRITE);
}
static inline pmd_t pmd_mkyoung(pmd_t pmd)
{
#ifdef CONFIG_64BIT
if (pmd_prot_none(pmd)) {
pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
} else {
pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG;
pmd_val(pmd) &= ~_SEGMENT_ENTRY_INVALID;
}
#endif
return pmd;
}
static inline pmd_t pmd_mkold(pmd_t pmd)
{
#ifdef CONFIG_64BIT
if (pmd_prot_none(pmd)) {
pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
} else {
pmd_val(pmd) &= ~_SEGMENT_ENTRY_YOUNG;
pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID;
}
#endif
return pmd;
}
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
int young;
young = pmd_young(pmd);
pmd_val(pmd) &= _SEGMENT_CHG_MASK;
pmd_val(pmd) |= massage_pgprot_pmd(newprot);
if (young)
pmd = pmd_mkyoung(pmd);
return pmd;
}
static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
{
pmd_t __pmd;
pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
return pmd_mkyoung(__pmd);
}
static inline pmd_t pmd_mkwrite(pmd_t pmd)
{
/* Do not clobber PROT_NONE segments! */
if (!pmd_prot_none(pmd))
pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
return pmd;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define __HAVE_ARCH_PGTABLE_DEPOSIT
extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable);
#define __HAVE_ARCH_PGTABLE_WITHDRAW
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
static inline int pmd_trans_splitting(pmd_t pmd)
{
return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
}
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t entry)
{
if (!(pmd_val(entry) & _SEGMENT_ENTRY_INVALID) && MACHINE_HAS_EDAT1)
pmd_val(entry) |= _SEGMENT_ENTRY_CO;
*pmdp = entry;
}
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
return pmd;
}
static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
/* Do not clobber PROT_NONE segments! */
if (!pmd_prot_none(pmd))
pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
return pmd;
}
static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
/* No dirty bit in the segment table entry. */
return pmd;
}
#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
pmd_t pmd;
pmd = *pmdp;
__pmd_idte(address, pmdp);
*pmdp = pmd_mkold(pmd);
return pmd_young(pmd);
}
#define __HAVE_ARCH_PMDP_GET_AND_CLEAR
static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
unsigned long address, pmd_t *pmdp)
{
pmd_t pmd = *pmdp;
__pmd_idte(address, pmdp);
pmd_clear(pmdp);
return pmd;
}
#define __HAVE_ARCH_PMDP_CLEAR_FLUSH
static inline pmd_t pmdp_clear_flush(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
return pmdp_get_and_clear(vma->vm_mm, address, pmdp);
}
#define __HAVE_ARCH_PMDP_INVALIDATE
static inline void pmdp_invalidate(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
__pmd_idte(address, pmdp);
}
#define __HAVE_ARCH_PMDP_SET_WRPROTECT
static inline void pmdp_set_wrprotect(struct mm_struct *mm,
unsigned long address, pmd_t *pmdp)
{
pmd_t pmd = *pmdp;
if (pmd_write(pmd)) {
__pmd_idte(address, pmdp);
set_pmd_at(mm, address, pmdp, pmd_wrprotect(pmd));
}
}
#define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
static inline int pmd_trans_huge(pmd_t pmd)
{
return pmd_val(pmd) & _SEGMENT_ENTRY_LARGE;
}
static inline int has_transparent_hugepage(void)
{
return MACHINE_HAS_HPAGE ? 1 : 0;
}
static inline unsigned long pmd_pfn(pmd_t pmd)
{
return pmd_val(pmd) >> PAGE_SHIFT;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
/*
* 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.
* Bits 21, 22, 30 and 31 are used to indicate the page type.
* A swap pte is indicated by bit pattern (pte & 0x603) == 0x402
* 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.
* Bits 53, 54, 62 and 63 are used to indicate the page type.
* A swap pte is indicated by bit pattern (pte & 0x603) == 0x402
* 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 CONFIG_64BIT
#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_INVALID | _PAGE_TYPE | ((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 CONFIG_64BIT
# define PTE_FILE_MAX_BITS 26
#else /* CONFIG_64BIT */
# define PTE_FILE_MAX_BITS 59
#endif /* CONFIG_64BIT */
#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 | _PAGE_PROTECT })
#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
*/
static inline void pgtable_cache_init(void) { }
static inline void check_pgt_cache(void) { }
#include <asm-generic/pgtable.h>
#endif /* _S390_PAGE_H */
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