Merge commit 'v2.6.27-rc6' into core/rcu

[linux-2.6-omap-h63xx.git] / arch / sh / mm / pg-sh4.c

diff --git a/arch/sh/mm/pg-sh4.c b/arch/sh/mm/pg-sh4.c
index df69da9ca69c7685e48a709924e58c175836ebe3..38870e0fc182af3347ed90986d9fb3b31578fadb 100644 (file)
--- a/arch/sh/mm/pg-sh4.c
+++ b/arch/sh/mm/pg-sh4.c
@@ -2,19 +2,47 @@
  * arch/sh/mm/pg-sh4.c
  *
  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
- * Copyright (C) 2002 - 2005  Paul Mundt
+ * Copyright (C) 2002 - 2007  Paul Mundt
  *
  * Released under the terms of the GNU GPL v2.0.
  */
 #include <linux/mm.h>
 #include <linux/mutex.h>
+#include <linux/fs.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 
-extern struct mutex p3map_mutex[];
-
 #define CACHE_ALIAS (current_cpu_data.dcache.alias_mask)
 
+static inline void *kmap_coherent(struct page *page, unsigned long addr)
+{
+       enum fixed_addresses idx;
+       unsigned long vaddr, flags;
+       pte_t pte;
+
+       inc_preempt_count();
+
+       idx = (addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT;
+       vaddr = __fix_to_virt(FIX_CMAP_END - idx);
+       pte = mk_pte(page, PAGE_KERNEL);
+
+       local_irq_save(flags);
+       flush_tlb_one(get_asid(), vaddr);
+       local_irq_restore(flags);
+
+       update_mmu_cache(NULL, vaddr, pte);
+
+       return (void *)vaddr;
+}
+
+static inline void kunmap_coherent(struct page *page)
+{
+       dec_preempt_count();
+       preempt_check_resched();
+}
+
 /*
  * clear_user_page
  * @to: P1 address
@@ -24,71 +52,66 @@ extern struct mutex p3map_mutex[];
 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 {
-               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, PAGE_KERNEL);
-               mutex_lock(&p3map_mutex[(address & CACHE_ALIAS)>>12]);
-               set_pte(pte, entry);
-               local_irq_save(flags);
-               flush_tlb_one(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);
-               mutex_unlock(&p3map_mutex[(address & CACHE_ALIAS)>>12]);
-       }
+
+       clear_page(to);
+       if ((((address & PAGE_MASK) ^ (unsigned long)to) & CACHE_ALIAS))
+               __flush_wback_region(to, PAGE_SIZE);
 }
 
-/*
- * 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)
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+                      unsigned long vaddr, void *dst, const void *src,
+                      unsigned long len)
 {
+       void *vto;
+
        __set_bit(PG_mapped, &page->flags);
-       if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
-               copy_page(to, from);
-       else {
-               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, PAGE_KERNEL);
-               mutex_lock(&p3map_mutex[(address & CACHE_ALIAS)>>12]);
-               set_pte(pte, entry);
-               local_irq_save(flags);
-               flush_tlb_one(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);
-               mutex_unlock(&p3map_mutex[(address & CACHE_ALIAS)>>12]);
-       }
+
+       vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+       memcpy(vto, src, len);
+       kunmap_coherent(vto);
+
+       if (vma->vm_flags & VM_EXEC)
+               flush_cache_page(vma, vaddr, page_to_pfn(page));
+}
+
+void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
+                        unsigned long vaddr, void *dst, const void *src,
+                        unsigned long len)
+{
+       void *vfrom;
+
+       __set_bit(PG_mapped, &page->flags);
+
+       vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+       memcpy(dst, vfrom, len);
+       kunmap_coherent(vfrom);
+}
+
+void copy_user_highpage(struct page *to, struct page *from,
+                       unsigned long vaddr, struct vm_area_struct *vma)
+{
+       void *vfrom, *vto;
+
+       __set_bit(PG_mapped, &to->flags);
+
+       vto = kmap_atomic(to, KM_USER1);
+       vfrom = kmap_coherent(from, vaddr);
+       copy_page(vto, vfrom);
+       kunmap_coherent(vfrom);
+
+       if (((vaddr ^ (unsigned long)vto) & CACHE_ALIAS))
+               __flush_wback_region(vto, PAGE_SIZE);
+
+       kunmap_atomic(vto, KM_USER1);
+       /* Make sure this page is cleared on other CPU's too before using it */
+       smp_wmb();
 }
+EXPORT_SYMBOL(copy_user_highpage);
 
 /*
  * 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 ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
        pte_t pte = *ptep;