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/* 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 <linux/const.h> #ifndef __ASSEMBLY__ #include <asm-generic/4level-fixup.h> #include <linux/spinlock.h> #include <linux/mm_types.h> #include <asm/types.h> #include <asm/pgtsrmmu.h> #include <asm/vaddrs.h> #include <asm/oplib.h> #include <asm/cpu_type.h> 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 PMD_SHIFT 22 #define PMD_SIZE (1UL << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) #define PGDIR_SHIFT SRMMU_PGDIR_SHIFT #define PGDIR_SIZE SRMMU_PGDIR_SIZE #define PGDIR_MASK SRMMU_PGDIR_MASK #define PTRS_PER_PTE 1024 #define PTRS_PER_PMD SRMMU_PTRS_PER_PMD #define PTRS_PER_PGD SRMMU_PTRS_PER_PGD #define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE #define FIRST_USER_ADDRESS 0UL #define PTE_SIZE (PTRS_PER_PTE4) #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; / xwr / #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY #define __P011 PAGE_COPY #define __P100 PAGE_READONLY #define __P101 PAGE_READONLY #define __P110 PAGE_COPY #define __P111 PAGE_COPY #define __S000 PAGE_NONE #define __S001 PAGE_READONLY #define __S010 PAGE_SHARED #define __S011 PAGE_SHARED #define __S100 PAGE_READONLY #define __S101 PAGE_READONLY #define __S110 PAGE_SHARED #define __S111 PAGE_SHARED / 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)); } #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) static inline int srmmu_device_memory(unsigned long x) { return ((x & 0xF0000000) != 0); } static inline struct page pmd_page(pmd_t pmd) { if (srmmu_device_memory(pmd_val(pmd))) BUG(); return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); } static inline unsigned long pgd_page_vaddr(pgd_t pgd) { if (srmmu_device_memory(pgd_val(pgd))) { return ~0; } else { unsigned long v = pgd_val(pgd) & SRMMU_PTD_PMASK; return (unsigned long)__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) { int i; for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) set_pte((pte_t )&pmdp->pmdv[i], __pte(0)); } static inline int pgd_none(pgd_t pgd) { return !(pgd_val(pgd) & 0xFFFFFFF); } static inline int pgd_bad(pgd_t pgd) { return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; } static inline int pgd_present(pgd_t pgd) { return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); } static inline void pgd_clear(pgd_t pgdp) { set_pte((pte_t )pgdp, __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 int pte_special(pte_t pte) { return 0; } 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 pte_mkspecial(pte) (pte) #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) >> (PAGE_SHIFT-4); } #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)); } #define pgd_index(address) ((address) >> PGDIR_SHIFT) /* to find an entry in a page-table-directory / #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) / to find an entry in a kernel page-table-directory / #define pgd_offset_k(address) pgd_offset(&init_mm, address) / Find an entry in the second-level page table.. / static inline pmd_t pmd_offset(pgd_t * dir, unsigned long address) { return (pmd_t ) pgd_page_vaddr(dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); } /* Find an entry in the third-level page table.. / pte_t pte_offset_kernel(pmd_t * dir, unsigned long address); /* * This shortcut works on sun4m (and sun4d) because the nocache area is static. / #define pte_offset_map(d, a) pte_offset_kernel(d,a) #define pte_unmap(pte) do{}while(0) 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) 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 and de-code a swap entry / 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 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; } } extern unsigned long sparc_valid_addr_bitmap; /* Needs to be defined here and not in linux/mm.h, as it is arch dependent / #define kern_addr_valid(addr) \ (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) / * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> 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_at((__vma)->vm_mm, (__address), __ptep, __entry); \ flush_tlb_page(__vma, __address); \ } \ __changed; \ }) #include <asm-generic/pgtable.h> #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 #endif / !(_SPARC_PGTABLE_H) */

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