/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _SPARC_PGTABLE_H #define _SPARC_PGTABLE_H /* asm/pgtable.h: Defines and functions used to work * with Sparc page tables. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include #define PMD_SHIFT 18 #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) #define PGDIR_SHIFT 24 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) #define PGDIR_ALIGN(__addr) (((__addr) + ~PGDIR_MASK) & PGDIR_MASK) #ifndef __ASSEMBLY__ #include #include #include #include #include #include #include #include struct vm_area_struct; struct page; void load_mmu(void); unsigned long calc_highpages(void); unsigned long __init bootmem_init(unsigned long *pages_avail); #define pte_ERROR(e) __builtin_trap() #define pmd_ERROR(e) __builtin_trap() #define pgd_ERROR(e) __builtin_trap() #define PTRS_PER_PTE 64 #define PTRS_PER_PMD 64 #define PTRS_PER_PGD 256 #define USER_PTRS_PER_PGD PAGE_OFFSET / PGDIR_SIZE #define PTE_SIZE (PTRS_PER_PTE*4) #define PAGE_NONE SRMMU_PAGE_NONE #define PAGE_SHARED SRMMU_PAGE_SHARED #define PAGE_COPY SRMMU_PAGE_COPY #define PAGE_READONLY SRMMU_PAGE_RDONLY #define PAGE_KERNEL SRMMU_PAGE_KERNEL /* Top-level page directory - dummy used by init-mm. * srmmu.c will assign the real one (which is dynamically sized) */ #define swapper_pg_dir NULL void paging_init(void); extern unsigned long ptr_in_current_pgd; /* First physical page can be anywhere, the following is needed so that * va-->pa and vice versa conversions work properly without performance * hit for all __pa()/__va() operations. */ extern unsigned long phys_base; extern unsigned long pfn_base; /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) /* * In general all page table modifications should use the V8 atomic * swap instruction. This insures the mmu and the cpu are in sync * with respect to ref/mod bits in the page tables. */ static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) { __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr) : "memory"); return value; } /* Certain architectures need to do special things when pte's * within a page table are directly modified. Thus, the following * hook is made available. */ static inline void set_pte(pte_t *ptep, pte_t pteval) { srmmu_swap((unsigned long *)ptep, pte_val(pteval)); } static inline int srmmu_device_memory(unsigned long x) { return ((x & 0xF0000000) != 0); } static inline unsigned long pmd_pfn(pmd_t pmd) { return (pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4); } static inline struct page *pmd_page(pmd_t pmd) { if (srmmu_device_memory(pmd_val(pmd))) BUG(); return pfn_to_page(pmd_pfn(pmd)); } static inline unsigned long __pmd_page(pmd_t pmd) { unsigned long v; if (srmmu_device_memory(pmd_val(pmd))) BUG(); v = pmd_val(pmd) & SRMMU_PTD_PMASK; return (unsigned long)__nocache_va(v << 4); } static inline unsigned long pmd_page_vaddr(pmd_t pmd) { unsigned long v = pmd_val(pmd) & SRMMU_PTD_PMASK; return (unsigned long)__nocache_va(v << 4); } static inline pmd_t *pud_pgtable(pud_t pud) { if (srmmu_device_memory(pud_val(pud))) { return (pmd_t *)~0; } else { unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK; return (pmd_t *)__nocache_va(v << 4); } } static inline int pte_present(pte_t pte) { return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE); } static inline int pte_none(pte_t pte) { return !pte_val(pte); } static inline void __pte_clear(pte_t *ptep) { set_pte(ptep, __pte(0)); } static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { __pte_clear(ptep); } static inline int pmd_bad(pmd_t pmd) { return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; } static inline int pmd_present(pmd_t pmd) { return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); } static inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); } static inline void pmd_clear(pmd_t *pmdp) { set_pte((pte_t *)&pmd_val(*pmdp), __pte(0)); } static inline int pud_none(pud_t pud) { return !(pud_val(pud) & 0xFFFFFFF); } static inline int pud_bad(pud_t pud) { return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD; } static inline int pud_present(pud_t pud) { return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD); } static inline void pud_clear(pud_t *pudp) { set_pte((pte_t *)pudp, __pte(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) & SRMMU_WRITE; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SRMMU_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & SRMMU_REF; } static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~SRMMU_WRITE); } static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~SRMMU_DIRTY); } static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~SRMMU_REF); } static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) | SRMMU_WRITE); } static inline pte_t pte_mkdirty(pte_t pte) { return __pte(pte_val(pte) | SRMMU_DIRTY); } static inline pte_t pte_mkyoung(pte_t pte) { return __pte(pte_val(pte) | SRMMU_REF); } #define PFN_PTE_SHIFT (PAGE_SHIFT - 4) #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) static inline unsigned long pte_pfn(pte_t pte) { if (srmmu_device_memory(pte_val(pte))) { /* Just return something that will cause * pfn_valid() to return false. This makes * copy_one_pte() to just directly copy to * PTE over. */ return ~0UL; } return (pte_val(pte) & SRMMU_PTE_PMASK) >> PFN_PTE_SHIFT; } #define pte_page(pte) pfn_to_page(pte_pfn(pte)) /* * 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(struct page *page, pgprot_t pgprot) { return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot)); } static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot) { return __pte(((page) >> 4) | pgprot_val(pgprot)); } static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space) { return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot)); } #define pgprot_noncached pgprot_noncached static inline pgprot_t pgprot_noncached(pgprot_t prot) { pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE)); return prot; } static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { return __pte((pte_val(pte) & SRMMU_CHG_MASK) | pgprot_val(newprot)); } /* only used by the huge vmap code, should never be called */ #define pud_page(pud) NULL struct seq_file; void mmu_info(struct seq_file *m); /* Fault handler stuff... */ #define FAULT_CODE_PROT 0x1 #define FAULT_CODE_WRITE 0x2 #define FAULT_CODE_USER 0x4 #define update_mmu_cache(vma, address, ptep) do { } while (0) #define update_mmu_cache_range(vmf, vma, address, ptep, nr) do { } while (0) void srmmu_mapiorange(unsigned int bus, unsigned long xpa, unsigned long xva, unsigned int len); void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len); /* * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that * are !pte_none() && !pte_present(). * * Format of swap PTEs: * * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 * <-------------- offset ---------------> < type -> E 0 0 0 0 0 0 */ static inline unsigned long __swp_type(swp_entry_t entry) { return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; } static inline unsigned long __swp_offset(swp_entry_t entry) { return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK; } static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) { return (swp_entry_t) { (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT }; } #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & SRMMU_SWP_EXCLUSIVE; } static inline pte_t pte_swp_mkexclusive(pte_t pte) { return __pte(pte_val(pte) | SRMMU_SWP_EXCLUSIVE); } static inline pte_t pte_swp_clear_exclusive(pte_t pte) { return __pte(pte_val(pte) & ~SRMMU_SWP_EXCLUSIVE); } static inline unsigned long __get_phys (unsigned long addr) { switch (sparc_cpu_model){ case sun4m: case sun4d: return ((srmmu_get_pte (addr) & 0xffffff00) << 4); default: return 0; } } static inline int __get_iospace (unsigned long addr) { switch (sparc_cpu_model){ case sun4m: case sun4d: return (srmmu_get_pte (addr) >> 28); default: return -1; } } /* * For sparc32&64, the pfn in io_remap_pfn_range() carries in * its high 4 bits. These macros/functions put it there or get it from there. */ #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) #define GET_PFN(pfn) (pfn & 0x0fffffffUL) int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long, unsigned long, pgprot_t); static inline int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot) { unsigned long long offset, space, phys_base; offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT; space = GET_IOSPACE(pfn); phys_base = offset | (space << 32ULL); return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot); } #define io_remap_pfn_range io_remap_pfn_range #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ ({ \ int __changed = !pte_same(*(__ptep), __entry); \ if (__changed) { \ set_pte(__ptep, __entry); \ flush_tlb_page(__vma, __address); \ } \ __changed; \ }) #endif /* !(__ASSEMBLY__) */ #define VMALLOC_START _AC(0xfe600000,UL) #define VMALLOC_END _AC(0xffc00000,UL) /* We provide our own get_unmapped_area to cope with VA holes for userland */ #define HAVE_ARCH_UNMAPPED_AREA #define pmd_pgtable(pmd) ((pgtable_t)__pmd_page(pmd)) #endif /* !(_SPARC_PGTABLE_H) */