diff options
Diffstat (limited to 'include/asm-s390/pgtable.h')
| -rw-r--r-- | include/asm-s390/pgtable.h | 219 |
1 files changed, 96 insertions, 123 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h index b424ab21f8bd..f9f59a805e5d 100644 --- a/include/asm-s390/pgtable.h +++ b/include/asm-s390/pgtable.h @@ -35,9 +35,6 @@ #include <asm/bug.h> #include <asm/processor.h> -struct vm_area_struct; /* forward declaration (include/linux/mm.h) */ -struct mm_struct; - extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096))); extern void paging_init(void); extern void vmem_map_init(void); @@ -221,6 +218,8 @@ extern unsigned long vmalloc_end; /* 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 */ @@ -264,60 +263,75 @@ extern unsigned long vmalloc_end; #ifndef __s390x__ -/* Bits in the segment table entry */ -#define _PAGE_TABLE_LEN 0xf /* only full page-tables */ -#define _PAGE_TABLE_COM 0x10 /* common page-table */ -#define _PAGE_TABLE_INV 0x20 /* invalid page-table */ -#define _SEG_PRESENT 0x001 /* Software (overlap with PTL) */ - -/* Bits int the storage key */ -#define _PAGE_CHANGED 0x02 /* HW changed bit */ -#define _PAGE_REFERENCED 0x04 /* HW referenced bit */ - -#define _USER_SEG_TABLE_LEN 0x7f /* user-segment-table up to 2 GB */ -#define _KERNEL_SEG_TABLE_LEN 0x7f /* kernel-segment-table up to 2 GB */ - -/* - * User and Kernel pagetables are identical - */ -#define _PAGE_TABLE _PAGE_TABLE_LEN -#define _KERNPG_TABLE _PAGE_TABLE_LEN - -/* - * The Kernel segment-tables includes the User segment-table - */ +/* 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 */ -#define _SEGMENT_TABLE (_USER_SEG_TABLE_LEN|0x80000000|0x100) -#define _KERNSEG_TABLE _KERNEL_SEG_TABLE_LEN +/* 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 USER_STD_MASK 0x00000080UL +#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 _PMD_ENTRY_INV 0x20 /* invalid segment table entry */ -#define _PMD_ENTRY 0x00 +#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 */ -/* Bits in the region third table entry */ -#define _PGD_ENTRY_INV 0x20 /* invalid region table entry */ -#define _PGD_ENTRY 0x07 +#define _SEGMENT_ENTRY (0) +#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV) + +#endif /* __s390x__ */ /* - * User and kernel page directory + * 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 _REGION_THIRD 0x4 -#define _REGION_THIRD_LEN 0x3 -#define _REGION_TABLE (_REGION_THIRD|_REGION_THIRD_LEN|0x40|0x100) -#define _KERN_REGION_TABLE (_REGION_THIRD|_REGION_THIRD_LEN) - -#define USER_STD_MASK 0x0000000000000080UL +#define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \ + _ASCE_ALT_EVENT) -/* Bits in the storage key */ +/* Bits int the storage key */ #define _PAGE_CHANGED 0x02 /* HW changed bit */ #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ -#endif /* __s390x__ */ - /* * Page protection definitions. */ @@ -358,65 +372,38 @@ extern unsigned long vmalloc_end; #define __S111 PAGE_EX_RW #ifndef __s390x__ -# define PMD_SHADOW_SHIFT 1 -# define PGD_SHADOW_SHIFT 1 +# define PxD_SHADOW_SHIFT 1 #else /* __s390x__ */ -# define PMD_SHADOW_SHIFT 2 -# define PGD_SHADOW_SHIFT 2 +# define PxD_SHADOW_SHIFT 2 #endif /* __s390x__ */ static inline struct page *get_shadow_page(struct page *page) { - if (s390_noexec && !list_empty(&page->lru)) - return virt_to_page(page->lru.next); - return NULL; -} - -static inline pte_t *get_shadow_pte(pte_t *ptep) -{ - unsigned long pteptr = (unsigned long) (ptep); - - if (s390_noexec) { - unsigned long offset = pteptr & (PAGE_SIZE - 1); - void *addr = (void *) (pteptr ^ offset); - struct page *page = virt_to_page(addr); - if (!list_empty(&page->lru)) - return (pte_t *) ((unsigned long) page->lru.next | - offset); - } + if (s390_noexec && page->index) + return virt_to_page((void *)(addr_t) page->index); return NULL; } -static inline pmd_t *get_shadow_pmd(pmd_t *pmdp) +static inline void *get_shadow_pte(void *table) { - unsigned long pmdptr = (unsigned long) (pmdp); + unsigned long addr, offset; + struct page *page; - if (s390_noexec) { - unsigned long offset = pmdptr & - ((PAGE_SIZE << PMD_SHADOW_SHIFT) - 1); - void *addr = (void *) (pmdptr ^ offset); - struct page *page = virt_to_page(addr); - if (!list_empty(&page->lru)) - return (pmd_t *) ((unsigned long) page->lru.next | - offset); - } - return NULL; + addr = (unsigned long) table; + offset = addr & (PAGE_SIZE - 1); + page = virt_to_page((void *)(addr ^ offset)); + return (void *)(addr_t)(page->index ? (page->index | offset) : 0UL); } -static inline pgd_t *get_shadow_pgd(pgd_t *pgdp) +static inline void *get_shadow_table(void *table) { - unsigned long pgdptr = (unsigned long) (pgdp); + unsigned long addr, offset; + struct page *page; - if (s390_noexec) { - unsigned long offset = pgdptr & - ((PAGE_SIZE << PGD_SHADOW_SHIFT) - 1); - void *addr = (void *) (pgdptr ^ offset); - struct page *page = virt_to_page(addr); - if (!list_empty(&page->lru)) - return (pgd_t *) ((unsigned long) page->lru.next | - offset); - } - return NULL; + 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); } /* @@ -448,47 +435,42 @@ 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 pmd_present(pmd_t pmd) { return pmd_val(pmd) & _SEG_PRESENT; } -static inline int pmd_none(pmd_t pmd) { return pmd_val(pmd) & _PAGE_TABLE_INV; } -static inline int pmd_bad(pmd_t pmd) -{ - return (pmd_val(pmd) & (~PAGE_MASK & ~_PAGE_TABLE_INV)) != _PAGE_TABLE; -} - #else /* __s390x__ */ static inline int pgd_present(pgd_t pgd) { - return (pgd_val(pgd) & ~PAGE_MASK) == _PGD_ENTRY; + return pgd_val(pgd) & _REGION_ENTRY_ORIGIN; } static inline int pgd_none(pgd_t pgd) { - return pgd_val(pgd) & _PGD_ENTRY_INV; + return pgd_val(pgd) & _REGION_ENTRY_INV; } static inline int pgd_bad(pgd_t pgd) { - return (pgd_val(pgd) & (~PAGE_MASK & ~_PGD_ENTRY_INV)) != _PGD_ENTRY; + unsigned long mask = ~_REGION_ENTRY_ORIGIN & ~_REGION_ENTRY_INV; + return (pgd_val(pgd) & mask) != _REGION3_ENTRY; } +#endif /* __s390x__ */ + static inline int pmd_present(pmd_t pmd) { - return (pmd_val(pmd) & ~PAGE_MASK) == _PMD_ENTRY; + return pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN; } static inline int pmd_none(pmd_t pmd) { - return pmd_val(pmd) & _PMD_ENTRY_INV; + return pmd_val(pmd) & _SEGMENT_ENTRY_INV; } static inline int pmd_bad(pmd_t pmd) { - return (pmd_val(pmd) & (~PAGE_MASK & ~_PMD_ENTRY_INV)) != _PMD_ENTRY; + unsigned long mask = ~_SEGMENT_ENTRY_ORIGIN & ~_SEGMENT_ENTRY_INV; + return (pmd_val(pmd) & mask) != _SEGMENT_ENTRY; } -#endif /* __s390x__ */ - static inline int pte_none(pte_t pte) { return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT); @@ -548,31 +530,22 @@ static inline void pgd_clear(pgd_t * pgdp) { } static inline void pmd_clear_kernel(pmd_t * pmdp) { - pmd_val(pmdp[0]) = _PAGE_TABLE_INV; - pmd_val(pmdp[1]) = _PAGE_TABLE_INV; - pmd_val(pmdp[2]) = _PAGE_TABLE_INV; - pmd_val(pmdp[3]) = _PAGE_TABLE_INV; -} - -static inline void pmd_clear(pmd_t * pmdp) -{ - pmd_t *shadow_pmd = get_shadow_pmd(pmdp); - - pmd_clear_kernel(pmdp); - if (shadow_pmd) - pmd_clear_kernel(shadow_pmd); + pmd_val(pmdp[0]) = _SEGMENT_ENTRY_EMPTY; + pmd_val(pmdp[1]) = _SEGMENT_ENTRY_EMPTY; + pmd_val(pmdp[2]) = _SEGMENT_ENTRY_EMPTY; + pmd_val(pmdp[3]) = _SEGMENT_ENTRY_EMPTY; } #else /* __s390x__ */ static inline void pgd_clear_kernel(pgd_t * pgdp) { - pgd_val(*pgdp) = _PGD_ENTRY_INV | _PGD_ENTRY; + pgd_val(*pgdp) = _REGION3_ENTRY_EMPTY; } static inline void pgd_clear(pgd_t * pgdp) { - pgd_t *shadow_pgd = get_shadow_pgd(pgdp); + pgd_t *shadow_pgd = get_shadow_table(pgdp); pgd_clear_kernel(pgdp); if (shadow_pgd) @@ -581,21 +554,21 @@ static inline void pgd_clear(pgd_t * pgdp) static inline void pmd_clear_kernel(pmd_t * pmdp) { - pmd_val(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY; - pmd_val1(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY; + pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY; + pmd_val1(*pmdp) = _SEGMENT_ENTRY_EMPTY; } +#endif /* __s390x__ */ + static inline void pmd_clear(pmd_t * pmdp) { - pmd_t *shadow_pmd = get_shadow_pmd(pmdp); + pmd_t *shadow_pmd = get_shadow_table(pmdp); pmd_clear_kernel(pmdp); if (shadow_pmd) pmd_clear_kernel(shadow_pmd); } -#endif /* __s390x__ */ - static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_t *shadow_pte = get_shadow_pte(ptep); |