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Diffstat (limited to '')
| -rw-r--r-- | arch/sparc/include/asm/pgtable_32.h | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h new file mode 100644 index 000000000..7d1d10a8f --- /dev/null +++ b/arch/sparc/include/asm/pgtable_32.h @@ -0,0 +1,433 @@ +/* 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> + +#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 <asm-generic/pgtable-nopud.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 PTRS_PER_PTE 64 +#define PTRS_PER_PMD 64 +#define PTRS_PER_PGD 256 +#define USER_PTRS_PER_PGD PAGE_OFFSET / PGDIR_SIZE +#define FIRST_USER_ADDRESS 0UL +#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; + +/* 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 __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(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)); +} + +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; \ +}) + +#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) */ |