Thread (36 messages) 36 messages, 4 authors, 2009-04-30

Re: [PATCH 2/2] powerpc: Add 2.06 tlbie mnemonics

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2009-04-27 01:22:14

On Fri, 2009-04-24 at 16:24 +1000, Michael Neuling wrote:
From: Milton Miller <redacted>

This adds the PowerPC 2.06 tlbie mnemonics and keeps backwards
compatibilty for CPUs before 2.06.

Only useful for bare metal systems.  
I'd rather stick that in mmu features rather than cpu features to
save space in the later...

Cheers,
Ben.
quoted hunk ↗ jump to hunk
Signed-off-by: Milton Miller <redacted>
Signed-off-by: Michael Neuling <redacted>
---
As they say, better out than in....
---

 arch/powerpc/include/asm/cputable.h |    3 ++-
 arch/powerpc/mm/hash_native_64.c    |   13 +++++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

Index: linux-2.6-ozlabs/arch/powerpc/include/asm/cputable.h
===================================================================
--- linux-2.6-ozlabs.orig/arch/powerpc/include/asm/cputable.h
+++ linux-2.6-ozlabs/arch/powerpc/include/asm/cputable.h
@@ -195,6 +195,7 @@ extern const char *powerpc_base_platform
 #define CPU_FTR_SAO			LONG_ASM_CONST(0x0020000000000000)
 #define CPU_FTR_CP_USE_DCBTZ		LONG_ASM_CONST(0x0040000000000000)
 #define CPU_FTR_UNALIGNED_LD_STD	LONG_ASM_CONST(0x0080000000000000)
+#define CPU_FTR_TLBIE_206		LONG_ASM_CONST(0x0100000000000000)
 
 #ifndef __ASSEMBLY__
 
@@ -409,7 +410,7 @@ extern const char *powerpc_base_platform
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | CPU_FTR_LOCKLESS_TLBIE | \
 	    CPU_FTR_PURR | CPU_FTR_SPURR | CPU_FTR_REAL_LE | \
-	    CPU_FTR_DSCR | CPU_FTR_SAO)
+	    CPU_FTR_DSCR | CPU_FTR_SAO | CPU_FTR_TLBIE_206)
 #define CPU_FTRS_CELL	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
Index: linux-2.6-ozlabs/arch/powerpc/mm/hash_native_64.c
===================================================================
--- linux-2.6-ozlabs.orig/arch/powerpc/mm/hash_native_64.c
+++ linux-2.6-ozlabs/arch/powerpc/mm/hash_native_64.c
@@ -38,6 +38,9 @@
 
 static DEFINE_SPINLOCK(native_tlbie_lock);
 
+#define TLBIE(lp,a) \
+	stringify_in_c(.long 0x7c000264 | ((a) << 11) | ((lp) << 21))
+
 static inline void __tlbie(unsigned long va, int psize, int ssize)
 {
 	unsigned int penc;
@@ -49,14 +52,19 @@ static inline void __tlbie(unsigned long
 	case MMU_PAGE_4K:
 		va &= ~0xffful;
 		va |= ssize << 8;
-		asm volatile("tlbie %0,0" : : "r" (va) : "memory");
+ 		asm volatile(ASM_FTR_IFCLR("tlbie %0,0", TLBIE(%1,%0), %2)
+			     : : "r" (va), "r"(0), "i" (CPU_FTR_TLBIE_206)
+			     : "memory");
 		break;
 	default:
 		penc = mmu_psize_defs[psize].penc;
 		va &= ~((1ul << mmu_psize_defs[psize].shift) - 1);
 		va |= penc << 12;
 		va |= ssize << 8;
-		asm volatile("tlbie %0,1" : : "r" (va) : "memory");
+		va |= 1; /* L */
+ 		asm volatile(ASM_FTR_IFCLR("tlbie %0,1", TLBIE(%1,%0), %2)
+			     : : "r" (va), "r"(0), "i" (CPU_FTR_TLBIE_206)
+			     : "memory");
 		break;
 	}
 }
@@ -80,6 +88,7 @@ static inline void __tlbiel(unsigned lon
 		va &= ~((1ul << mmu_psize_defs[psize].shift) - 1);
 		va |= penc << 12;
 		va |= ssize << 8;
+		va |= 1; /* L */
 		asm volatile(".long 0x7c000224 | (%0 << 11) | (1 << 21)"
 			     : : "r"(va) : "memory");
 		break;
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