diff options
Diffstat (limited to 'arch/sh/mm/pg-sh4.c')
| -rw-r--r-- | arch/sh/mm/pg-sh4.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/arch/sh/mm/pg-sh4.c b/arch/sh/mm/pg-sh4.c new file mode 100644 index 00000000000..e5907c7330e --- /dev/null +++ b/arch/sh/mm/pg-sh4.c @@ -0,0 +1,122 @@ +/* + * arch/sh/mm/pg-sh4.c + * + * Copyright (C) 1999, 2000, 2002 Niibe Yutaka + * Copyright (C) 2002 Paul Mundt + * + * Released under the terms of the GNU GPL v2.0. + */ +#include <linux/config.h> +#include <linux/init.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/threads.h> +#include <asm/addrspace.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/processor.h> +#include <asm/cache.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/pgalloc.h> +#include <asm/mmu_context.h> +#include <asm/cacheflush.h> + +extern struct semaphore p3map_sem[]; + +/* + * clear_user_page + * @to: P1 address + * @address: U0 address to be mapped + * @page: page (virt_to_page(to)) + */ +void clear_user_page(void *to, unsigned long address, struct page *page) +{ + __set_bit(PG_mapped, &page->flags); + if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) + clear_page(to); + else { + pgprot_t pgprot = __pgprot(_PAGE_PRESENT | + _PAGE_RW | _PAGE_CACHABLE | + _PAGE_DIRTY | _PAGE_ACCESSED | + _PAGE_HW_SHARED | _PAGE_FLAGS_HARD); + unsigned long phys_addr = PHYSADDR(to); + unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); + pgd_t *dir = pgd_offset_k(p3_addr); + pmd_t *pmd = pmd_offset(dir, p3_addr); + pte_t *pte = pte_offset_kernel(pmd, p3_addr); + pte_t entry; + unsigned long flags; + + entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot); + down(&p3map_sem[(address & CACHE_ALIAS)>>12]); + set_pte(pte, entry); + local_irq_save(flags); + __flush_tlb_page(get_asid(), p3_addr); + local_irq_restore(flags); + update_mmu_cache(NULL, p3_addr, entry); + __clear_user_page((void *)p3_addr, to); + pte_clear(&init_mm, p3_addr, pte); + up(&p3map_sem[(address & CACHE_ALIAS)>>12]); + } +} + +/* + * copy_user_page + * @to: P1 address + * @from: P1 address + * @address: U0 address to be mapped + * @page: page (virt_to_page(to)) + */ +void copy_user_page(void *to, void *from, unsigned long address, + struct page *page) +{ + __set_bit(PG_mapped, &page->flags); + if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) + copy_page(to, from); + else { + pgprot_t pgprot = __pgprot(_PAGE_PRESENT | + _PAGE_RW | _PAGE_CACHABLE | + _PAGE_DIRTY | _PAGE_ACCESSED | + _PAGE_HW_SHARED | _PAGE_FLAGS_HARD); + unsigned long phys_addr = PHYSADDR(to); + unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); + pgd_t *dir = pgd_offset_k(p3_addr); + pmd_t *pmd = pmd_offset(dir, p3_addr); + pte_t *pte = pte_offset_kernel(pmd, p3_addr); + pte_t entry; + unsigned long flags; + + entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot); + down(&p3map_sem[(address & CACHE_ALIAS)>>12]); + set_pte(pte, entry); + local_irq_save(flags); + __flush_tlb_page(get_asid(), p3_addr); + local_irq_restore(flags); + update_mmu_cache(NULL, p3_addr, entry); + __copy_user_page((void *)p3_addr, from, to); + pte_clear(&init_mm, p3_addr, pte); + up(&p3map_sem[(address & CACHE_ALIAS)>>12]); + } +} + +/* + * For SH-4, we have our own implementation for ptep_get_and_clear + */ +inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ + pte_t pte = *ptep; + + pte_clear(mm, addr, ptep); + if (!pte_not_present(pte)) { + unsigned long pfn = pte_pfn(pte); + if (pfn_valid(pfn)) { + struct page *page = pfn_to_page(pfn); + struct address_space *mapping = page_mapping(page); + if (!mapping || !mapping_writably_mapped(mapping)) + __clear_bit(PG_mapped, &page->flags); + } + } + return pte; +} + |