/* * arch/sh/mm/pg-sh4.c * * Copyright (C) 1999, 2000, 2002 Niibe Yutaka * Copyright (C) 2002 - 2005 Paul Mundt * * Released under the terms of the GNU GPL v2.0. */ #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[]; #define CACHE_ALIAS (cpu_data->dcache.alias_mask) /* * 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 *pgd = pgd_offset_k(p3_addr); pud_t *pud = pud_offset(pgd, p3_addr); pmd_t *pmd = pmd_offset(pud, 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 *pgd = pgd_offset_k(p3_addr); pud_t *pud = pud_offset(pgd, p3_addr); pmd_t *pmd = pmd_offset(pud, 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; }