powerpc/mm: Split low level tlb invalidate for nohash processors

Currently, the various forms of low level TLB invalidations are all
implemented in misc_32.S for 32-bit processors, in a fairly scary
mess of #ifdef's and with interesting duplication such as a whole
bunch of code for FSL _tlbie and _tlbia which are no longer used.

This moves things around such that _tlbie is now defined in
hash_low_32.S and is only used by the 32-bit hash code, and all
nohash CPUs use the various _tlbil_* forms that are now moved to
a new file, tlb_nohash_low.S.

I moved all the definitions for that stuff out of
include/asm/tlbflush.h as they are really internal mm stuff, into
mm/mmu_decl.h

The code should have no functional changes.  I kept some variants
inline for trivial forms on things like 40x and 8xx.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index b4344fd30f2..4314b39b6fa 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -22,10 +22,58 @@
 #include <asm/tlbflush.h>
 #include <asm/mmu.h>
 
+#ifdef CONFIG_PPC_MMU_NOHASH
+
+/*
+ * On 40x and 8xx, we directly inline tlbia and tlbivax
+ */
+#if defined(CONFIG_40x) || defined(CONFIG_8xx)
+static inline void _tlbil_all(void)
+{
+        asm volatile ("sync; tlbia; isync" : : : "memory")
+}
+static inline void _tlbil_pid(unsigned int pid)
+{
+        asm volatile ("sync; tlbia; isync" : : : "memory")
+}
+#else /* CONFIG_40x || CONFIG_8xx */
+extern void _tlbil_all(void);
+extern void _tlbil_pid(unsigned int pid);
+#endif /* !(CONFIG_40x || CONFIG_8xx) */
+
+/*
+ * On 8xx, we directly inline tlbie, on others, it's extern
+ */
+#ifdef CONFIG_8xx
+static inline void _tlbil_va(unsigned long address, unsigned int pid)
+{
+        asm volatile ("tlbie %0; sync" : : "r" (address) : "memory")
+}
+#else /* CONFIG_8xx */
+extern void _tlbil_va(unsigned long address, unsigned int pid);
+#endif /* CONIFG_8xx */
+
+/*
+ * As of today, we don't support tlbivax broadcast on any
+ * implementation. When that becomes the case, this will be
+ * an extern.
+ */
+static inline void _tlbivax_bcast(unsigned long address, unsigned int pid)
+{
+        BUG();
+}
+
+#else /* CONFIG_PPC_MMU_NOHASH */
+
 extern void hash_preload(struct mm_struct *mm, unsigned long ea,
                          unsigned long access, unsigned long trap);
 
 
+extern void _tlbie(unsigned long address);
+extern void _tlbia(void);
+
+#endif /* CONFIG_PPC_MMU_NOHASH */
+
 #ifdef CONFIG_PPC32
 extern void mapin_ram(void);
 extern int map_page(unsigned long va, phys_addr_t pa, int flags);