Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/mm/pg-sh4.c |
| 3 | * |
| 4 | * Copyright (C) 1999, 2000, 2002 Niibe Yutaka |
| 5 | * Copyright (C) 2002 Paul Mundt |
| 6 | * |
| 7 | * Released under the terms of the GNU GPL v2.0. |
| 8 | */ |
| 9 | #include <linux/config.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/mman.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/threads.h> |
| 14 | #include <asm/addrspace.h> |
| 15 | #include <asm/page.h> |
| 16 | #include <asm/pgtable.h> |
| 17 | #include <asm/processor.h> |
| 18 | #include <asm/cache.h> |
| 19 | #include <asm/io.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | #include <asm/pgalloc.h> |
| 22 | #include <asm/mmu_context.h> |
| 23 | #include <asm/cacheflush.h> |
| 24 | |
| 25 | extern struct semaphore p3map_sem[]; |
| 26 | |
| 27 | /* |
| 28 | * clear_user_page |
| 29 | * @to: P1 address |
| 30 | * @address: U0 address to be mapped |
| 31 | * @page: page (virt_to_page(to)) |
| 32 | */ |
| 33 | void clear_user_page(void *to, unsigned long address, struct page *page) |
| 34 | { |
| 35 | __set_bit(PG_mapped, &page->flags); |
| 36 | if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) |
| 37 | clear_page(to); |
| 38 | else { |
| 39 | pgprot_t pgprot = __pgprot(_PAGE_PRESENT | |
| 40 | _PAGE_RW | _PAGE_CACHABLE | |
| 41 | _PAGE_DIRTY | _PAGE_ACCESSED | |
| 42 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD); |
| 43 | unsigned long phys_addr = PHYSADDR(to); |
| 44 | unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); |
| 45 | pgd_t *dir = pgd_offset_k(p3_addr); |
| 46 | pmd_t *pmd = pmd_offset(dir, p3_addr); |
| 47 | pte_t *pte = pte_offset_kernel(pmd, p3_addr); |
| 48 | pte_t entry; |
| 49 | unsigned long flags; |
| 50 | |
| 51 | entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot); |
| 52 | down(&p3map_sem[(address & CACHE_ALIAS)>>12]); |
| 53 | set_pte(pte, entry); |
| 54 | local_irq_save(flags); |
| 55 | __flush_tlb_page(get_asid(), p3_addr); |
| 56 | local_irq_restore(flags); |
| 57 | update_mmu_cache(NULL, p3_addr, entry); |
| 58 | __clear_user_page((void *)p3_addr, to); |
| 59 | pte_clear(&init_mm, p3_addr, pte); |
| 60 | up(&p3map_sem[(address & CACHE_ALIAS)>>12]); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * copy_user_page |
| 66 | * @to: P1 address |
| 67 | * @from: P1 address |
| 68 | * @address: U0 address to be mapped |
| 69 | * @page: page (virt_to_page(to)) |
| 70 | */ |
| 71 | void copy_user_page(void *to, void *from, unsigned long address, |
| 72 | struct page *page) |
| 73 | { |
| 74 | __set_bit(PG_mapped, &page->flags); |
| 75 | if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) |
| 76 | copy_page(to, from); |
| 77 | else { |
| 78 | pgprot_t pgprot = __pgprot(_PAGE_PRESENT | |
| 79 | _PAGE_RW | _PAGE_CACHABLE | |
| 80 | _PAGE_DIRTY | _PAGE_ACCESSED | |
| 81 | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD); |
| 82 | unsigned long phys_addr = PHYSADDR(to); |
| 83 | unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); |
| 84 | pgd_t *dir = pgd_offset_k(p3_addr); |
| 85 | pmd_t *pmd = pmd_offset(dir, p3_addr); |
| 86 | pte_t *pte = pte_offset_kernel(pmd, p3_addr); |
| 87 | pte_t entry; |
| 88 | unsigned long flags; |
| 89 | |
| 90 | entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot); |
| 91 | down(&p3map_sem[(address & CACHE_ALIAS)>>12]); |
| 92 | set_pte(pte, entry); |
| 93 | local_irq_save(flags); |
| 94 | __flush_tlb_page(get_asid(), p3_addr); |
| 95 | local_irq_restore(flags); |
| 96 | update_mmu_cache(NULL, p3_addr, entry); |
| 97 | __copy_user_page((void *)p3_addr, from, to); |
| 98 | pte_clear(&init_mm, p3_addr, pte); |
| 99 | up(&p3map_sem[(address & CACHE_ALIAS)>>12]); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * For SH-4, we have our own implementation for ptep_get_and_clear |
| 105 | */ |
| 106 | inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
| 107 | { |
| 108 | pte_t pte = *ptep; |
| 109 | |
| 110 | pte_clear(mm, addr, ptep); |
| 111 | if (!pte_not_present(pte)) { |
| 112 | unsigned long pfn = pte_pfn(pte); |
| 113 | if (pfn_valid(pfn)) { |
| 114 | struct page *page = pfn_to_page(pfn); |
| 115 | struct address_space *mapping = page_mapping(page); |
| 116 | if (!mapping || !mapping_writably_mapped(mapping)) |
| 117 | __clear_bit(PG_mapped, &page->flags); |
| 118 | } |
| 119 | } |
| 120 | return pte; |
| 121 | } |
| 122 | |