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-rw-r--r--arch/powerpc/include/asm/nohash/tlbflush.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nohash/tlbflush.h b/arch/powerpc/include/asm/nohash/tlbflush.h
new file mode 100644
index 000000000..bdaf34ad4
--- /dev/null
+++ b/arch/powerpc/include/asm/nohash/tlbflush.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_NOHASH_TLBFLUSH_H
+#define _ASM_POWERPC_NOHASH_TLBFLUSH_H
+
+/*
+ * TLB flushing:
+ *
+ * - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ * - flush_tlb_page(vma, vmaddr) flushes one page
+ * - local_flush_tlb_mm(mm, full) flushes the specified mm context on
+ * the local processor
+ * - local_flush_tlb_page(vma, vmaddr) flushes one page on the local processor
+ * - flush_tlb_range(vma, start, end) flushes a range of pages
+ * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
+ *
+ */
+
+/*
+ * TLB flushing for software loaded TLB chips
+ *
+ * TODO: (CONFIG_PPC_85xx) determine if flush_tlb_range &
+ * flush_tlb_kernel_range are best implemented as tlbia vs
+ * specific tlbie's
+ */
+
+struct vm_area_struct;
+struct mm_struct;
+
+#define MMU_NO_CONTEXT ((unsigned int)-1)
+
+extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end);
+
+#ifdef CONFIG_PPC_8xx
+static inline void local_flush_tlb_mm(struct mm_struct *mm)
+{
+ unsigned int pid = READ_ONCE(mm->context.id);
+
+ if (pid != MMU_NO_CONTEXT)
+ asm volatile ("sync; tlbia; isync" : : : "memory");
+}
+
+static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+ asm volatile ("tlbie %0; sync" : : "r" (vmaddr) : "memory");
+}
+
+static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ start &= PAGE_MASK;
+
+ if (end - start <= PAGE_SIZE)
+ asm volatile ("tlbie %0; sync" : : "r" (start) : "memory");
+ else
+ asm volatile ("sync; tlbia; isync" : : : "memory");
+}
+#else
+extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
+extern void local_flush_tlb_mm(struct mm_struct *mm);
+extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+
+extern void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
+ int tsize, int ind);
+#endif
+
+#ifdef CONFIG_SMP
+extern void flush_tlb_mm(struct mm_struct *mm);
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+extern void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
+ int tsize, int ind);
+#else
+#define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
+#define flush_tlb_page(vma,addr) local_flush_tlb_page(vma,addr)
+#define __flush_tlb_page(mm,addr,p,i) __local_flush_tlb_page(mm,addr,p,i)
+#endif
+
+#endif /* _ASM_POWERPC_NOHASH_TLBFLUSH_H */