![Paul Mundt](/assets/img/avatar_default.png)
Now that the SH-4 page clear/copy ops are generic, they can be used for all platforms with CONFIG_MMU=y. SH-5 remains the odd one out, but it too will gradually be converted over to using this interface. SH-3 platforms which do not contain aliases will see no impact from this change, while aliasing SH-3 platforms will get the same interface as SH-4. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/*
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* arch/sh/mm/pg-mmu.c
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*
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* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
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* Copyright (C) 2002 - 2009 Paul Mundt
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*
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* Released under the terms of the GNU GPL v2.0.
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*/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/fs.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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#define kmap_get_fixmap_pte(vaddr) \
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pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
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static pte_t *kmap_coherent_pte;
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void __init kmap_coherent_init(void)
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{
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#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
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unsigned long vaddr;
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/* cache the first coherent kmap pte */
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vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
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kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
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#endif
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}
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static inline void *kmap_coherent(struct page *page, unsigned long addr)
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{
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enum fixed_addresses idx;
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unsigned long vaddr, flags;
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pte_t pte;
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inc_preempt_count();
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idx = (addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT;
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vaddr = __fix_to_virt(FIX_CMAP_END - idx);
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pte = mk_pte(page, PAGE_KERNEL);
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local_irq_save(flags);
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flush_tlb_one(get_asid(), vaddr);
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local_irq_restore(flags);
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update_mmu_cache(NULL, vaddr, pte);
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set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
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return (void *)vaddr;
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}
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static inline void kunmap_coherent(struct page *page)
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{
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dec_preempt_count();
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preempt_check_resched();
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}
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void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
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!test_bit(PG_dcache_dirty, &page->flags)) {
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void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
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memcpy(vto, src, len);
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kunmap_coherent(vto);
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} else {
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memcpy(dst, src, len);
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if (boot_cpu_data.dcache.n_aliases)
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set_bit(PG_dcache_dirty, &page->flags);
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}
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if (vma->vm_flags & VM_EXEC)
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flush_cache_page(vma, vaddr, page_to_pfn(page));
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}
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void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
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!test_bit(PG_dcache_dirty, &page->flags)) {
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void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
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memcpy(dst, vfrom, len);
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kunmap_coherent(vfrom);
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} else {
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memcpy(dst, src, len);
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if (boot_cpu_data.dcache.n_aliases)
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set_bit(PG_dcache_dirty, &page->flags);
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}
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}
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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void *vfrom, *vto;
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vto = kmap_atomic(to, KM_USER1);
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if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
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!test_bit(PG_dcache_dirty, &from->flags)) {
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vfrom = kmap_coherent(from, vaddr);
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copy_page(vto, vfrom);
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kunmap_coherent(vfrom);
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} else {
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vfrom = kmap_atomic(from, KM_USER0);
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copy_page(vto, vfrom);
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kunmap_atomic(vfrom, KM_USER0);
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}
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if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
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__flush_wback_region(vto, PAGE_SIZE);
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kunmap_atomic(vto, KM_USER1);
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/* Make sure this page is cleared on other CPU's too before using it */
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smp_wmb();
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}
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EXPORT_SYMBOL(copy_user_highpage);
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void clear_user_highpage(struct page *page, unsigned long vaddr)
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{
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void *kaddr = kmap_atomic(page, KM_USER0);
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clear_page(kaddr);
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if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
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__flush_wback_region(kaddr, PAGE_SIZE);
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kunmap_atomic(kaddr, KM_USER0);
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}
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EXPORT_SYMBOL(clear_user_highpage);
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