/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_SW64_PGTABLE_H #define _ASM_SW64_PGTABLE_H #include /* * This file contains the functions and defines necessary to modify and use * the sw64 page table tree. * * This hopefully works with any standard sw64 page-size, as defined * in (currently 8192). */ #include #include #include /* For TASK_SIZE */ #include struct mm_struct; struct vm_area_struct; /* Certain architectures need to do special things when PTEs * within a page table are directly modified. Thus, the following * hook is made available. */ #define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval)) static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval) { set_pte(ptep, pteval); } #define set_pmd(pmdptr, pmdval) ((*(pmdptr)) = (pmdval)) static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmdval) { set_pmd(pmdp, pmdval); } /* PGDIR_SHIFT determines what a forth-level page table entry can map */ #define PGDIR_SHIFT (PAGE_SHIFT + 3 * (PAGE_SHIFT - 3)) #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE - 1)) /* PUD_SHIFT determines the size of the area a third-level page table can map */ #define PUD_SHIFT (PAGE_SHIFT + 2 * (PAGE_SHIFT - 3)) #define PUD_SIZE (1UL << PUD_SHIFT) #define PUD_MASK (~(PUD_SIZE-1)) /* PMD_SHIFT determines the size of the area a second-level page table can map */ #define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3)) #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE - 1)) /* * Entries per page directory level: the sw64 is three-level, with * all levels having a one-page page table. */ #define PTRS_PER_PTE (1UL << (PAGE_SHIFT - 3)) #define PTRS_PER_PMD (1UL << (PAGE_SHIFT - 3)) #define PTRS_PER_PGD (1UL << (PAGE_SHIFT - 3)) #define PTRS_PER_PUD (1UL << (PAGE_SHIFT - 3)) #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) #define FIRST_USER_ADDRESS 0UL /* Number of pointers that fit on a page: this will go away. */ #define PTRS_PER_PAGE (1UL << (PAGE_SHIFT - 3)) #define VMALLOC_START (-2 * PGDIR_SIZE) #ifndef CONFIG_SPARSEMEM_VMEMMAP #define VMALLOC_END (-PGDIR_SIZE) #else #define VMEMMAP_END (-PGDIR_SIZE) #define vmemmap ((struct page *)VMEMMAP_END - (1UL << (3 * (PAGE_SHIFT - 3)))) #define VMALLOC_END ((unsigned long)vmemmap) #endif /* * HMcode-imposed page table bits */ #define _PAGE_VALID 0x0001 #define _PAGE_FOR 0x0002 /* used for page protection (fault on read) */ #define _PAGE_FOW 0x0004 /* used for page protection (fault on write) */ #define _PAGE_FOE 0x0008 /* used for page protection (fault on exec) */ #define _PAGE_ASM 0x0010 #define _PAGE_PHU 0x0020 /* used for 256M page size bit */ #define _PAGE_PSE 0x0040 /* used for 8M page size bit */ #define _PAGE_PROTNONE 0x0080 /* used for numa page balancing */ #define _PAGE_SPECIAL 0x0100 #define _PAGE_KRE 0x0400 /* xxx - see below on the "accessed" bit */ #define _PAGE_URE 0x0800 /* xxx */ #define _PAGE_KWE 0x4000 /* used to do the dirty bit in software */ #define _PAGE_UWE 0x8000 /* used to do the dirty bit in software */ /* .. and these are ours ... */ #define _PAGE_DIRTY 0x20000 #define _PAGE_ACCESSED 0x40000 #define _PAGE_BIT_ACCESSED 18 /* bit of _PAGE_ACCESSED */ #define _PAGE_BIT_FOW 2 /* bit of _PAGE_FOW */ #define _PAGE_SPLITTING 0x200000 /* For Transparent Huge Page */ #define _PAGE_BIT_SPLITTING 21 /* bit of _PAGE_SPLITTING */ /* * NOTE! The "accessed" bit isn't necessarily exact: it can be kept exactly * by software (use the KRE/URE/KWE/UWE bits appropriately), but I'll fake it. * Under Linux/sw64, the "accessed" bit just means "read", and I'll just use * the KRE/URE bits to watch for it. That way we don't need to overload the * KWE/UWE bits with both handling dirty and accessed. * * Note that the kernel uses the accessed bit just to check whether to page * out a page or not, so it doesn't have to be exact anyway. */ #define __DIRTY_BITS (_PAGE_DIRTY | _PAGE_KWE | _PAGE_UWE) #define __ACCESS_BITS (_PAGE_ACCESSED | _PAGE_KRE | _PAGE_URE) #define _PFN_MASK 0xFFFFFFFFF0000000UL #define _PFN_BITS 36 #define _PTE_FLAGS_BITS (64 - _PFN_BITS) #define _PAGE_TABLE (_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS) #define _PAGE_CHG_MASK (_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS | _PAGE_SPECIAL) #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_PHU) /* * All the normal masks have the "page accessed" bits on, as any time they are used, * the page is accessed. They are cleared only by the page-out routines */ #define PAGE_NONE __pgprot(__ACCESS_BITS | _PAGE_FOR | _PAGE_FOW | _PAGE_FOE | _PAGE_PROTNONE) #define PAGE_SHARED __pgprot(_PAGE_VALID | __ACCESS_BITS) #define PAGE_COPY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW) #define PAGE_READONLY __pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW) #define PAGE_KERNEL __pgprot(_PAGE_VALID | _PAGE_ASM | _PAGE_KRE | _PAGE_KWE) #define _PAGE_NORMAL(x) __pgprot(_PAGE_VALID | __ACCESS_BITS | (x)) #define _PAGE_P(x) _PAGE_NORMAL((x) | _PAGE_FOW) #define _PAGE_S(x) _PAGE_NORMAL(x) /* * The hardware can handle write-only mappings, but as the sw64 * architecture does byte-wide writes with a read-modify-write * sequence, it's not practical to have write-without-read privs. * Thus the "-w- -> rw-" and "-wx -> rwx" mapping here (and in * arch/sw_64/mm/fault.c) */ /* xwr */ #define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR) #define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW) #define __P010 _PAGE_P(_PAGE_FOE) #define __P011 _PAGE_P(_PAGE_FOE) #define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR) #define __P101 _PAGE_P(_PAGE_FOW) #define __P110 _PAGE_P(0) #define __P111 _PAGE_P(0) #define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR) #define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW) #define __S010 _PAGE_S(_PAGE_FOE) #define __S011 _PAGE_S(_PAGE_FOE) #define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR) #define __S101 _PAGE_S(_PAGE_FOW) #define __S110 _PAGE_S(0) #define __S111 _PAGE_S(0) /* * pgprot_noncached() is only for infiniband pci support, and a real * implementation for RAM would be more complicated. */ #define pgprot_noncached(prot) (prot) /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ extern struct page *empty_zero_page; #define ZERO_PAGE(vaddr) (empty_zero_page) /* number of bits that fit into a memory pointer */ #define BITS_PER_PTR (8 * sizeof(unsigned long)) /* to align the pointer to a pointer address */ #define PTR_MASK (~(sizeof(void *) - 1)) /* sizeof(void*)==1<> (PAGE_SHIFT - SIZEOF_PTR_LOG2) & PTR_MASK & ~PAGE_MASK) #define PHYS_TWIDDLE(pfn) (pfn) /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ #define page_to_pa(page) (page_to_pfn(page) << PAGE_SHIFT) #define pmd_pfn(pmd) (pmd_val(pmd) >> _PTE_FLAGS_BITS) #define pte_pfn(pte) (pte_val(pte) >> _PTE_FLAGS_BITS) #ifndef CONFIG_DISCONTIGMEM #define pte_page(pte) pfn_to_page(pte_pfn(pte)) #define mk_pte(page, pgprot) \ ({ \ pte_t pte; \ \ pte_val(pte) = (page_to_pfn(page) << _PTE_FLAGS_BITS) | pgprot_val(pgprot); \ pte; \ }) #endif static inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot) { pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << _PTE_FLAGS_BITS) | pgprot_val(pgprot); return pte; } static inline pmd_t pfn_pmd(unsigned long physpfn, pgprot_t pgprot) { pmd_t pmd; pmd_val(pmd) = (PHYS_TWIDDLE(physpfn) << _PTE_FLAGS_BITS) | pgprot_val(pgprot); return pmd; } static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) { pmd_val(pmd) = (pmd_val(pmd) & _HPAGE_CHG_MASK) | pgprot_val(newprot); return pmd; } static inline void pmd_set(pmd_t *pmdp, pte_t *ptep) { pmd_val(*pmdp) = _PAGE_TABLE | (__pa(ptep) << (_PTE_FLAGS_BITS - PAGE_SHIFT)); } static inline void pud_set(pud_t *pudp, pmd_t *pmdp) { pud_val(*pudp) = _PAGE_TABLE | (__pa(pmdp) << (_PTE_FLAGS_BITS - PAGE_SHIFT)); } static inline void p4d_set(p4d_t *p4dp, pud_t *pudp) { p4d_val(*p4dp) = _PAGE_TABLE | (__pa(pudp) << (_PTE_FLAGS_BITS - PAGE_SHIFT)); } static inline unsigned long pmd_page_vaddr(pmd_t pmd) { return ((pmd_val(pmd) & _PFN_MASK) >> (_PTE_FLAGS_BITS-PAGE_SHIFT)) + PAGE_OFFSET; } #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> _PTE_FLAGS_BITS)) #define pud_page(pud) (pfn_to_page(pud_val(pud) >> _PTE_FLAGS_BITS)) #define p4d_page(p4d) (pfn_to_page(p4d_val(p4d) >> _PTE_FLAGS_BITS)) static inline pud_t *p4d_pgtable(p4d_t p4d) { return (pud_t *)(PAGE_OFFSET + ((p4d_val(p4d) & _PFN_MASK) >> (_PTE_FLAGS_BITS-PAGE_SHIFT))); } static inline pmd_t *pud_pgtable(pud_t pud) { return (pmd_t *)(PAGE_OFFSET + ((pud_val(pud) & _PFN_MASK) >> (_PTE_FLAGS_BITS-PAGE_SHIFT))); } static inline int pte_none(pte_t pte) { return !pte_val(pte); } static inline int pte_present(pte_t pte) { return pte_val(pte) & (_PAGE_VALID | _PAGE_PROTNONE); } static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; } static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_val(*ptep) = 0; } #define pte_accessible pte_accessible static inline bool pte_accessible(struct mm_struct *mm, pte_t a) { if (pte_val(a) & _PAGE_VALID) return true; if ((pte_val(a) & _PAGE_PROTNONE) && mm_tlb_flush_pending(mm)) return true; return false; } static inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); } static inline int pmd_bad(pmd_t pmd) { return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; } static inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & (_PAGE_VALID | _PAGE_PROTNONE); } static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; } static inline int pmd_dirty(pmd_t pmd) { return pmd_val(pmd) & _PAGE_DIRTY; } static inline int pmd_young(pmd_t pmd) { return pmd_val(pmd) & _PAGE_ACCESSED; } #define __HAVE_ARCH_PMD_WRITE #define pmd_write pmd_write static inline int pmd_write(pmd_t pmd) { return !(pmd_val(pmd) & _PAGE_FOW); } static inline pmd_t pmd_wrprotect(pmd_t pmd) { pmd_val(pmd) |= _PAGE_FOW; return pmd; } static inline pmd_t pmd_mkinvalid(pmd_t pmd) { pmd_val(pmd) &= ~(_PAGE_VALID | _PAGE_PROTNONE); return pmd; } static inline pmd_t pmd_mkclean(pmd_t pmd) { pmd_val(pmd) &= ~(__DIRTY_BITS); pmd_val(pmd) |= _PAGE_FOW; return pmd; } static inline pmd_t pmd_mkold(pmd_t pmd) { pmd_val(pmd) &= ~(__ACCESS_BITS); return pmd; } static inline pmd_t pmd_mkwrite(pmd_t pmd) { pmd_val(pmd) &= ~_PAGE_FOW; return pmd; } static inline pmd_t pmd_mkdirty(pmd_t pmd) { pmd_val(pmd) |= __DIRTY_BITS; return pmd; } static inline pmd_t pmd_mkyoung(pmd_t pmd) { pmd_val(pmd) |= __ACCESS_BITS; return pmd; } static inline pmd_t pmd_mkhuge(pmd_t pmd) { pmd_val(pmd) |= _PAGE_PSE; return pmd; } static inline int pud_none(pud_t pud) { return !pud_val(pud); } static inline int pud_bad(pud_t pud) { return (pud_val(pud) & ~_PFN_MASK) != _PAGE_TABLE; } static inline int pud_present(pud_t pud) { return pud_val(pud) & _PAGE_VALID; } static inline void pud_clear(pud_t *pudp) { pud_val(*pudp) = 0; } static inline int p4d_none(p4d_t p4d) { return !p4d_val(p4d); } static inline int p4d_bad(p4d_t p4d) { return (p4d_val(p4d) & ~_PFN_MASK) != _PAGE_TABLE; } static inline int p4d_present(p4d_t p4d) { return p4d_val(p4d) & _PAGE_VALID; } static inline void p4d_clear(p4d_t *p4dp) { p4d_val(*p4dp) = 0; } /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); pte_val(pte) |= _PAGE_FOW; return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; } static inline pte_t pte_mkhuge(pte_t pte) { pte_val(pte) |= _PAGE_PSE; return pte; } static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } #ifdef CONFIG_NUMA_BALANCING /* * See the comment in include/asm-generic/pgtable.h */ static inline int pte_protnone(pte_t pte) { return (pte_val(pte) & (_PAGE_PROTNONE | _PAGE_VALID)) == _PAGE_PROTNONE; } static inline int pmd_protnone(pmd_t pmd) { return (pmd_val(pmd) & (_PAGE_PROTNONE | _PAGE_VALID)) == _PAGE_PROTNONE; } #endif #ifdef CONFIG_TRANSPARENT_HUGEPAGE /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/ #define pmdp_establish generic_pmdp_establish static inline int pmd_trans_splitting(pmd_t pmd) { return pmd_val(pmd) & _PAGE_SPLITTING; } static inline int pmd_trans_huge(pmd_t pmd) { return pmd_val(pmd) & _PAGE_PSE; } static inline int has_transparent_hugepage(void) { return 1; } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #define __HAVE_ARCH_PMDP_GET_AND_CLEAR static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp) { unsigned long pmd_val = xchg(&pmdp->pmd, 0); pmd_t pmd = (pmd_t){pmd_val}; return pmd; } #define __HAVE_ARCH_PMDP_SET_WRPROTECT static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp) { set_bit(_PAGE_BIT_FOW, (unsigned long *)pmdp); } #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) #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_TEST_AND_CLEAR_YOUNG extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp); #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_PMDP_SPLITTING_FLUSH extern void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp); #define PAGE_DIR_OFFSET(tsk, address) pgd_offset((tsk), (address)) /* to find an entry in a kernel page-table-directory */ #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) /* to find an entry in a page-table-directory. */ #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) extern pgd_t swapper_pg_dir[1024]; /* * The sw64 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, pmd) do { } while (0) /* * Encode and decode a swap entry: * * Format of swap PTE: * bit 0: _PAGE_VALID (must be zero) * bit 6: _PAGE_PSE (must be zero) * bit 7: _PAGE_PROTNONE (must be zero) * bits 8-15: swap type * bits 16-63: swap offset */ #define __SWP_TYPE_SHIFT 8 #define __SWP_TYPE_BITS 8 #define __SWP_OFFSET_BITS 48 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) #define __swp_entry(type, offset) \ ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) #if defined(CONFIG_FLATMEM) #define kern_addr_valid(addr) (1) #elif defined(CONFIG_DISCONTIGMEM) /* XXX: FIXME -- wli */ #define kern_addr_valid(kaddr) (0) #elif defined(CONFIG_SPARSEMEM) #define kern_addr_valid(addr) (1) #endif #define pte_ERROR(e) \ pr_err("%s: %d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) #define pmd_ERROR(e) \ pr_err("%s: %d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) #define pud_ERROR(e) \ pr_err("%s: %d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) #define pgd_ERROR(e) \ pr_err("%s: %d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e)) extern void paging_init(void); /* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT. */ #define HAVE_ARCH_UNMAPPED_AREA #endif /* _ASM_SW64_PGTABLE_H */