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Diffstat (limited to 'include/asm-s390/pgtable.h')
| -rw-r--r-- | include/asm-s390/pgtable.h | 1093 |
1 files changed, 0 insertions, 1093 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h deleted file mode 100644 index 0bdb704..0000000 --- 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 */ |