powerpc: merge tlbflush.h

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 146 insertions, 0 deletions

diff --git a/include/asm-powerpc/tlbflush.h b/include/asm-powerpc/tlbflush.h
new file mode 100644
index 000000000000..ca3655672bbc
--- /dev/null
+++ b/include/asm-powerpc/tlbflush.h
@@ -0,0 +1,146 @@
+#ifndef _ASM_POWERPC_TLBFLUSH_H
+#define _ASM_POWERPC_TLBFLUSH_H
+/*
+ * TLB flushing:
+ *
+ *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ *  - flush_tlb_page(vma, vmaddr) flushes one page
+ *  - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
+ *  - flush_tlb_range(vma, start, end) flushes a range of pages
+ *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
+ *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ */
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+
+struct mm_struct;
+
+#ifdef CONFIG_PPC64
+
+#include <linux/percpu.h>
+#include <asm/page.h>
+
+#define PPC64_TLB_BATCH_NR 192
+
+struct ppc64_tlb_batch {
+        unsigned long index;
+        struct mm_struct *mm;
+        pte_t pte[PPC64_TLB_BATCH_NR];
+        unsigned long vaddr[PPC64_TLB_BATCH_NR];
+        unsigned int large;
+};
+DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
+
+extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);
+
+static inline void flush_tlb_pending(void)
+{
+        struct ppc64_tlb_batch *batch = &get_cpu_var(ppc64_tlb_batch);
+
+        if (batch->index)
+                __flush_tlb_pending(batch);
+        put_cpu_var(ppc64_tlb_batch);
+}
+
+extern void flush_hash_page(unsigned long va, pte_t pte, int local);
+void flush_hash_range(unsigned long number, int local);
+
+#else /* CONFIG_PPC64 */
+
+#include <linux/mm.h>
+
+extern void _tlbie(unsigned long address);
+extern void _tlbia(void);
+
+/*
+ * TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
+ * flush_tlb_kernel_range are best implemented as tlbia vs
+ * specific tlbie's
+ */
+
+#if (defined(CONFIG_4xx) && !defined(CONFIG_44x)) || defined(CONFIG_8xx)
+#define flush_tlb_pending()     asm volatile ("tlbia; sync" : : : "memory")
+#elif defined(CONFIG_4xx) || defined(CONFIG_FSL_BOOKE)
+#define flush_tlb_pending()     _tlbia()
+#endif
+
+/*
+ * This gets called at the end of handling a page fault, when
+ * the kernel has put a new PTE into the page table for the process.
+ * We use it to ensure coherency between the i-cache and d-cache
+ * for the page which has just been mapped in.
+ * On machines which use an MMU hash table, we use this to put a
+ * corresponding HPTE into the hash table ahead of time, instead of
+ * waiting for the inevitable extra hash-table miss exception.
+ */
+extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
+
+#endif /* CONFIG_PPC64 */
+
+#if defined(CONFIG_PPC64) || defined(CONFIG_4xx) || \
+        defined(CONFIG_FSL_BOOKE) || defined(CONFIG_8xx)
+
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+        flush_tlb_pending();
+}
+
+static inline void flush_tlb_page(struct vm_area_struct *vma,
+                                unsigned long vmaddr)
+{
+#ifdef CONFIG_PPC64
+        flush_tlb_pending();
+#else
+        _tlbie(vmaddr);
+#endif
+}
+
+static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
+                                         unsigned long vmaddr)
+{
+#ifndef CONFIG_PPC64
+        _tlbie(vmaddr);
+#endif
+}
+
+static inline void flush_tlb_range(struct vm_area_struct *vma,
+                unsigned long start, unsigned long end)
+{
+        flush_tlb_pending();
+}
+
+static inline void flush_tlb_kernel_range(unsigned long start,
+                unsigned long end)
+{
+        flush_tlb_pending();
+}
+
+#else   /* 6xx, 7xx, 7xxx cpus */
+
+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_nohash(struct vm_area_struct *vma, unsigned long addr);
+extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+                            unsigned long end);
+extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
+
+#endif
+
+/*
+ * This is called in munmap when we have freed up some page-table
+ * pages.  We don't need to do anything here, there's nothing special
+ * about our page-table pages.  -- paulus
+ */
+static inline void flush_tlb_pgtables(struct mm_struct *mm,
+                unsigned long start, unsigned long end)
+{
+}
+
+#endif /*__KERNEL__ */
+#endif /* _ASM_POWERPC_TLBFLUSH_H */