}
}
+#define flush_dcache_mmap_lock(mapping) \
+ spin_lock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_unlock(mapping) \
+ spin_unlock_irq(&(mapping)->tree_lock)
+
#define flush_icache_page(vma,page) do { flush_kernel_dcache_page(page_address(page)); flush_kernel_icache_page(page_address(page)); } while (0)
#define flush_icache_range(s,e) do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0)
-#define flush_icache_user_range(vma, page, addr, len) do { \
- flush_user_dcache_range(addr, addr + len); \
- flush_user_icache_range(addr, addr + len); } while (0)
-
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
do { memcpy(dst, src, len); \
- flush_icache_user_range(vma, page, vaddr, len); \
+ flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \
} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
}
}
-static inline void
-flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
+/* Simple function to work out if we have an existing address translation
+ * for a user space vma. */
+static inline int translation_exists(struct vm_area_struct *vma,
+ unsigned long addr)
{
- int sr3;
+ pgd_t *pgd = pgd_offset(vma->vm_mm, addr);
+ pmd_t *pmd;
+ pte_t *pte;
- if (!vma->vm_mm->context) {
- BUG();
- return;
- }
+ if(pgd_none(*pgd))
+ return 0;
- sr3 = mfsp(3);
- if (vma->vm_mm->context == sr3) {
- flush_user_dcache_range(vmaddr,vmaddr + PAGE_SIZE);
+ pmd = pmd_offset(pgd, addr);
+ if(pmd_none(*pmd) || pmd_bad(*pmd))
+ return 0;
+
+ pte = pte_offset_map(pmd, addr);
+
+ /* The PA flush mappings show up as pte_none, but they're
+ * valid none the less */
+ if(pte_none(*pte) && ((pte_val(*pte) & _PAGE_FLUSH) == 0))
+ return 0;
+ return 1;
+}
+
+
+/* Private function to flush a page from the cache of a non-current
+ * process. cr25 contains the Page Directory of the current user
+ * process; we're going to hijack both it and the user space %sr3 to
+ * temporarily make the non-current process current. We have to do
+ * this because cache flushing may cause a non-access tlb miss which
+ * the handlers have to fill in from the pgd of the non-current
+ * process. */
+static inline void
+flush_user_cache_page_non_current(struct vm_area_struct *vma,
+ unsigned long vmaddr)
+{
+ /* save the current process space and pgd */
+ unsigned long space = mfsp(3), pgd = mfctl(25);
+
+ /* we don't mind taking interrups since they may not
+ * do anything with user space, but we can't
+ * be preempted here */
+ preempt_disable();
+
+ /* make us current */
+ mtctl(__pa(vma->vm_mm->pgd), 25);
+ mtsp(vma->vm_mm->context, 3);
+
+ flush_user_dcache_page(vmaddr);
+ if(vma->vm_flags & VM_EXEC)
+ flush_user_icache_page(vmaddr);
+
+ /* put the old current process back */
+ mtsp(space, 3);
+ mtctl(pgd, 25);
+ preempt_enable();
+}
+
+static inline void
+__flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+ if (likely(vma->vm_mm->context == mfsp(3))) {
+ flush_user_dcache_page(vmaddr);
if (vma->vm_flags & VM_EXEC)
- flush_user_icache_range(vmaddr,vmaddr + PAGE_SIZE);
+ flush_user_icache_page(vmaddr);
} else {
- if (vma->vm_flags & VM_EXEC)
- flush_cache_all();
- else
- flush_data_cache();
+ flush_user_cache_page_non_current(vma, vmaddr);
}
}
+
+static inline void
+flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+ BUG_ON(!vma->vm_mm->context);
+
+ if(likely(translation_exists(vma, vmaddr)))
+ __flush_cache_page(vma, vmaddr);
+
+}
#endif