diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/include/asm/pgtable.h')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/include/asm/pgtable.h | 1248 |
1 files changed, 0 insertions, 1248 deletions
diff --git a/ANDROID_3.4.5/arch/s390/include/asm/pgtable.h b/ANDROID_3.4.5/arch/s390/include/asm/pgtable.h deleted file mode 100644 index 011358c1..00000000 --- a/ANDROID_3.4.5/arch/s390/include/asm/pgtable.h +++ /dev/null @@ -1,1248 +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/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); -extern void fault_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) - -/* - * 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 is_zero_pfn is_zero_pfn -static inline int is_zero_pfn(unsigned long pfn) -{ - extern unsigned long zero_pfn; - unsigned long offset_from_zero_pfn = pfn - zero_pfn; - return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); -} - -#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr)) - -#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) / 128GB (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. - */ -extern unsigned long VMALLOC_START; -extern unsigned long VMALLOC_END; -extern struct page *vmemmap; - -#define VMEM_MAX_PHYS ((unsigned long) vmemmap) - -/* - * 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_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_SWC 0x004 /* SW pte changed bit (for KVM) */ -#define _PAGE_SWR 0x008 /* SW pte referenced bit (for KVM) */ -#define _PAGE_SPECIAL 0x010 /* 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_SWC | _PAGE_SWR) - -/* 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 - -/* - * 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 - * - * 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. - */ - -#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_RO 0x200 /* page protection bit */ -#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) - -/* Page status table bits for virtualization */ -#define RCP_ACC_BITS 0xf0000000UL -#define RCP_FP_BIT 0x08000000UL -#define RCP_PCL_BIT 0x00800000UL -#define RCP_HR_BIT 0x00400000UL -#define RCP_HC_BIT 0x00200000UL -#define RCP_GR_BIT 0x00040000UL -#define RCP_GC_BIT 0x00020000UL - -/* User dirty / referenced bit for KVM's migration feature */ -#define KVM_UR_BIT 0x00008000UL -#define KVM_UC_BIT 0x00004000UL - -#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 */ - -/* Page status table bits for virtualization */ -#define RCP_ACC_BITS 0xf000000000000000UL -#define RCP_FP_BIT 0x0800000000000000UL -#define RCP_PCL_BIT 0x0080000000000000UL -#define RCP_HR_BIT 0x0040000000000000UL -#define RCP_HC_BIT 0x0020000000000000UL -#define RCP_GR_BIT 0x0004000000000000UL -#define RCP_GC_BIT 0x0002000000000000UL - -/* User dirty / referenced bit for KVM's migration feature */ -#define KVM_UR_BIT 0x0000800000000000UL -#define KVM_UC_BIT 0x0000400000000000UL - -#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) - -/* - * 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_KERNEL PAGE_RW -#define PAGE_COPY PAGE_RO - -/* - * 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_RO -#define __P010 PAGE_RO -#define __P011 PAGE_RO -#define __P100 PAGE_RO -#define __P101 PAGE_RO -#define __P110 PAGE_RO -#define __P111 PAGE_RO - -#define __S000 PAGE_NONE -#define __S001 PAGE_RO -#define __S010 PAGE_RW -#define __S011 PAGE_RW -#define __S100 PAGE_RO -#define __S101 PAGE_RO -#define __S110 PAGE_RW -#define __S111 PAGE_RW - -static inline int mm_exclusive(struct mm_struct *mm) -{ - return likely(mm == current->active_mm && - atomic_read(&mm->context.attach_count) <= 1); -} - -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 __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 -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 RCP_PCL_BIT in old */ - " oihh %1,0x0080\n" /* set RCP_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"); -#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 RCP_PCL_BIT */ - " stg %1,%0\n" - : "=Q" (ptep[PTRS_PER_PTE]) - : "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc"); - preempt_enable(); -#endif -} - -static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste) -{ -#ifdef CONFIG_PGSTE - unsigned long address, bits; - unsigned char skey; - - if (!pte_present(*ptep)) - return pgste; - address = pte_val(*ptep) & PAGE_MASK; - skey = page_get_storage_key(address); - bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED); - /* Clear page changed & referenced bit in the storage key */ - if (bits & _PAGE_CHANGED) - page_set_storage_key(address, skey ^ bits, 1); - else if (bits) - page_reset_referenced(address); - /* Transfer page changed & referenced bit to guest bits in pgste */ - pgste_val(pgste) |= bits << 48; /* RCP_GR_BIT & RCP_GC_BIT */ - /* Get host changed & referenced bits from pgste */ - bits |= (pgste_val(pgste) & (RCP_HR_BIT | RCP_HC_BIT)) >> 52; - /* Clear host bits in pgste. */ - pgste_val(pgste) &= ~(RCP_HR_BIT | RCP_HC_BIT); - pgste_val(pgste) &= ~(RCP_ACC_BITS | RCP_FP_BIT); - /* Copy page access key and fetch protection bit to pgste */ - pgste_val(pgste) |= - (unsigned long) (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56; - /* Transfer changed and referenced to kvm user bits */ - pgste_val(pgste) |= bits << 45; /* KVM_UR_BIT & KVM_UC_BIT */ - /* Transfer changed & referenced to pte sofware bits */ - pte_val(*ptep) |= bits << 1; /* _PAGE_SWR & _PAGE_SWC */ -#endif - return pgste; - -} - -static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste) -{ -#ifdef CONFIG_PGSTE - int young; - - if (!pte_present(*ptep)) - return pgste; - young = page_reset_referenced(pte_val(*ptep) & PAGE_MASK); - /* Transfer page referenced bit to pte software bit (host view) */ - if (young || (pgste_val(pgste) & RCP_HR_BIT)) - pte_val(*ptep) |= _PAGE_SWR; - /* Clear host referenced bit in pgste. */ - pgste_val(pgste) &= ~RCP_HR_BIT; - /* Transfer page referenced bit to guest bit in pgste */ - pgste_val(pgste) |= (unsigned long) young << 50; /* set RCP_GR_BIT */ -#endif - return pgste; - -} - -static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry) -{ -#ifdef CONFIG_PGSTE - unsigned long address; - unsigned long okey, nkey; - - if (!pte_present(entry)) - return; - address = pte_val(entry) & PAGE_MASK; - okey = nkey = page_get_storage_key(address); - nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT); - /* Set page access key and fetch protection bit from pgste */ - nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56; - if (okey != nkey) - page_set_storage_key(address, nkey, 1); -#endif -} - -/** - * 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; - struct list_head crst_list; -}; - -/** - * struct gmap_rmap - reverse mapping for segment table entries - * @next: pointer to the next gmap_rmap structure in the list - * @entry: pointer to a segment table entry - */ -struct gmap_rmap { - struct list_head list; - unsigned long *entry; -}; - -/** - * 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 maping a page table - */ -struct gmap_pgtable { - unsigned long vmaddr; - struct list_head mapper; -}; - -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 length); -int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); -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 *); - -/* - * 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_pte(ptep, pgste, entry); - *ptep = entry; - pgste_set_unlock(ptep, pgste); - } else - *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_RO) == 0; -} - -static inline int pte_dirty(pte_t pte) -{ -#ifdef CONFIG_PGSTE - if (pte_val(pte) & _PAGE_SWC) - return 1; -#endif - return 0; -} - -static inline int pte_young(pte_t pte) -{ -#ifdef CONFIG_PGSTE - if (pte_val(pte) & _PAGE_SWR) - return 1; -#endif - return 0; -} - -/* - * pgd/pmd/pte modification functions - */ - -static inline void pgd_clear(pgd_t *pgd) -{ -#ifdef __s390x__ - 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 __s390x__ - 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_EMPTY; -} - -static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) -{ - pte_val(*ptep) = _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) -{ -#ifdef CONFIG_PGSTE - pte_val(pte) &= ~_PAGE_SWC; -#endif - return pte; -} - -static inline pte_t pte_mkdirty(pte_t pte) -{ - return pte; -} - -static inline pte_t pte_mkold(pte_t pte) -{ -#ifdef CONFIG_PGSTE - pte_val(pte) &= ~_PAGE_SWR; -#endif - return pte; -} - -static inline pte_t pte_mkyoung(pte_t pte) -{ - 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) -{ - /* - * PROT_NONE needs to be remapped from the pte type to the ste type. - * The HW invalid bit is also different for pte and ste. The pte - * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE - * bit, so we don't have to clear it. - */ - if (pte_val(pte) & _PAGE_INVALID) { - if (pte_val(pte) & _PAGE_SWT) - pte_val(pte) |= _HPAGE_TYPE_NONE; - pte_val(pte) |= _SEGMENT_ENTRY_INV; - } - /* - * Clear SW pte bits SWT and SWX, there are no SW bits in a segment - * table entry. - */ - pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX); - /* - * Also set the change-override bit because we don't need dirty bit - * tracking for hugetlbfs pages. - */ - pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO); - 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) & KVM_UC_BIT); - pgste_val(pgste) &= ~KVM_UC_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) & KVM_UR_BIT); - pgste_val(pgste) &= ~KVM_UR_BIT; - pgste_set_unlock(ptep, pgste); - } - return young; -} - -#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; - - if (mm_has_pgste(vma->vm_mm)) { - pgste = pgste_get_lock(ptep); - pgste = pgste_update_young(ptep, pgste); - pte = *ptep; - *ptep = pte_mkold(pte); - pgste_set_unlock(ptep, pgste); - return pte_young(pte); - } - 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 */ - return ptep_test_and_clear_young(vma, address, ptep); -} - -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)); - } -} - -/* - * 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; - - mm->context.flush_mm = 1; - if (mm_has_pgste(mm)) - pgste = pgste_get_lock(ptep); - - pte = *ptep; - if (!mm_exclusive(mm)) - __ptep_ipte(address, ptep); - pte_val(*ptep) = _PAGE_TYPE_EMPTY; - - 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) -{ - pte_t pte; - - mm->context.flush_mm = 1; - if (mm_has_pgste(mm)) - pgste_get_lock(ptep); - - pte = *ptep; - if (!mm_exclusive(mm)) - __ptep_ipte(address, ptep); - return pte; -} - -static inline void ptep_modify_prot_commit(struct mm_struct *mm, - unsigned long address, - pte_t *ptep, pte_t pte) -{ - *ptep = pte; - if (mm_has_pgste(mm)) - pgste_set_unlock(ptep, *(pgste_t *)(ptep + PTRS_PER_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); - - pte = *ptep; - __ptep_ipte(address, ptep); - pte_val(*ptep) = _PAGE_TYPE_EMPTY; - - 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 (mm_has_pgste(mm)) - pgste = pgste_get_lock(ptep); - - pte = *ptep; - if (!full) - __ptep_ipte(address, ptep); - pte_val(*ptep) = _PAGE_TYPE_EMPTY; - - if (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)) { - mm->context.flush_mm = 1; - if (mm_has_pgste(mm)) - pgste = pgste_get_lock(ptep); - - if (!mm_exclusive(mm)) - __ptep_ipte(address, ptep); - *ptep = pte_wrprotect(pte); - - if (mm_has_pgste(mm)) - pgste_set_unlock(ptep, pgste); - } - 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); - - __ptep_ipte(address, ptep); - *ptep = entry; - - if (mm_has_pgste(vma->vm_mm)) - pgste_set_unlock(ptep, pgste); - 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; -} - -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_unmap(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 */ |