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Diffstat (limited to 'arch/sh/mm/pg-sh7705.c')
| -rw-r--r-- | arch/sh/mm/pg-sh7705.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/sh/mm/pg-sh7705.c b/arch/sh/mm/pg-sh7705.c new file mode 100644 index 000000000000..ff9ece986cbc --- /dev/null +++ b/arch/sh/mm/pg-sh7705.c @@ -0,0 +1,137 @@ +/* + * arch/sh/mm/pg-sh7705.c + * + * Copyright (C) 1999, 2000 Niibe Yutaka + * Copyright (C) 2004 Alex Song + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + */ + +#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> + +static inline void __flush_purge_virtual_region(void *p1, void *virt, int size) +{ + unsigned long v; + unsigned long begin, end; + unsigned long p1_begin; + + + begin = L1_CACHE_ALIGN((unsigned long)virt); + end = L1_CACHE_ALIGN((unsigned long)virt + size); + + p1_begin = (unsigned long)p1 & ~(L1_CACHE_BYTES - 1); + + /* do this the slow way as we may not have TLB entries + * for virt yet. */ + for (v = begin; v < end; v += L1_CACHE_BYTES) { + unsigned long p; + unsigned long ways, addr; + + p = __pa(p1_begin); + + ways = cpu_data->dcache.ways; + addr = CACHE_OC_ADDRESS_ARRAY; + + do { + unsigned long data; + + addr |= (v & cpu_data->dcache.entry_mask); + + data = ctrl_inl(addr); + if ((data & CACHE_PHYSADDR_MASK) == + (p & CACHE_PHYSADDR_MASK)) { + data &= ~(SH_CACHE_UPDATED|SH_CACHE_VALID); + ctrl_outl(data, addr); + } + + addr += cpu_data->dcache.way_incr; + } while (--ways); + + p1_begin += L1_CACHE_BYTES; + } +} + +/* + * clear_user_page + * @to: P1 address + * @address: U0 address to be mapped + */ +void clear_user_page(void *to, unsigned long address, struct page *pg) +{ + struct page *page = virt_to_page(to); + + __set_bit(PG_mapped, &page->flags); + if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) { + clear_page(to); + __flush_wback_region(to, PAGE_SIZE); + } else { + __flush_purge_virtual_region(to, + (void *)(address & 0xfffff000), + PAGE_SIZE); + clear_page(to); + __flush_wback_region(to, PAGE_SIZE); + } +} + +/* + * copy_user_page + * @to: P1 address + * @from: P1 address + * @address: U0 address to be mapped + */ +void copy_user_page(void *to, void *from, unsigned long address, struct page *pg) +{ + struct page *page = virt_to_page(to); + + + __set_bit(PG_mapped, &page->flags); + if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) { + copy_page(to, from); + __flush_wback_region(to, PAGE_SIZE); + } else { + __flush_purge_virtual_region(to, + (void *)(address & 0xfffff000), + PAGE_SIZE); + copy_page(to, from); + __flush_wback_region(to, PAGE_SIZE); + } +} + +/* + * For SH7705, we have our own implementation for ptep_get_and_clear + * Copied from pg-sh4.c + */ +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; +} + |