1 files changed, 62 insertions, 22 deletions

diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c
index 79aedaf36f2..7b7fe2d7b9d 100644
--- a/arch/powerpc/mm/hash_native_64.c
+++ b/arch/powerpc/mm/hash_native_64.c
@@ -26,6 +26,7 @@
 #include <asm/tlb.h>
 #include <asm/cputable.h>
 #include <asm/udbg.h>
+#include <asm/kexec.h>
 
 #ifdef DEBUG_LOW
 #define DBG_LOW(fmt...) udbg_printf(fmt)
@@ -340,31 +341,70 @@ static void native_hpte_invalidate(unsigned long slot, unsigned long va,
 	local_irq_restore(flags);
 }
 
-/*
- * XXX This need fixing based on page size. It's only used by
- * native_hpte_clear() for now which needs fixing too so they
- * make a good pair...
- */
-static unsigned long slot2va(unsigned long hpte_v, unsigned long slot)
-{
-	unsigned long avpn = HPTE_V_AVPN_VAL(hpte_v);
-	unsigned long va;
+#define LP_SHIFT	12
+#define LP_BITS		8
+#define LP_MASK(i)	((0xFF >> (i)) << LP_SHIFT)
 
-	va = avpn << 23;
+static void hpte_decode(hpte_t *hpte, unsigned long slot,
+			int *psize, unsigned long *va)
+{
+	unsigned long hpte_r = hpte->r;
+	unsigned long hpte_v = hpte->v;
+	unsigned long avpn;
+	int i, size, shift, penc, avpnm_bits;
+
+	if (!(hpte_v & HPTE_V_LARGE))
+		size = MMU_PAGE_4K;
+	else {
+		for (i = 0; i < LP_BITS; i++) {
+			if ((hpte_r & LP_MASK(i+1)) == LP_MASK(i+1))
+				break;
+		}
+		penc = LP_MASK(i+1) >> LP_SHIFT;
+		for (size = 0; size < MMU_PAGE_COUNT; size++) {
 
-	if (! (hpte_v & HPTE_V_LARGE)) {
-		unsigned long vpi, pteg;
+			/* 4K pages are not represented by LP */
+			if (size == MMU_PAGE_4K)
+				continue;
 
-		pteg = slot / HPTES_PER_GROUP;
-		if (hpte_v & HPTE_V_SECONDARY)
-			pteg = ~pteg;
+			/* valid entries have a shift value */
+			if (!mmu_psize_defs[size].shift)
+				continue;
 
-		vpi = ((va >> 28) ^ pteg) & htab_hash_mask;
+			if (penc == mmu_psize_defs[size].penc)
+				break;
+		}
+	}
 
-		va |= vpi << PAGE_SHIFT;
+	/*
+	 * FIXME, the code below works for 16M, 64K, and 4K pages as these
+	 * fall under the p<=23 rules for calculating the virtual address.
+	 * In the case of 16M pages, an extra bit is stolen from the AVPN
+	 * field to achieve the requisite 24 bits.
+	 *
+	 * Does not work for 16G pages or 1 TB segments.
+	 */
+	shift = mmu_psize_defs[size].shift;
+	if (mmu_psize_defs[size].avpnm)
+		avpnm_bits = __ilog2_u64(mmu_psize_defs[size].avpnm) + 1;
+	else
+		avpnm_bits = 0;
+	if (shift - avpnm_bits <= 23) {
+		avpn = HPTE_V_AVPN_VAL(hpte_v) << 23;
+
+		if (shift < 23) {
+			unsigned long vpi, pteg;
+
+			pteg = slot / HPTES_PER_GROUP;
+			if (hpte_v & HPTE_V_SECONDARY)
+				pteg = ~pteg;
+			vpi = ((avpn >> 28) ^ pteg) & htab_hash_mask;
+			avpn |= (vpi << mmu_psize_defs[size].shift);
+		}
 	}
 
-	return va;
+	*va = avpn;
+	*psize = size;
 }
 
 /*
@@ -374,15 +414,14 @@ static unsigned long slot2va(unsigned long hpte_v, unsigned long slot)
  *
  * TODO: add batching support when enabled.  remember, no dynamic memory here,
  * athough there is the control page available...
- *
- * XXX FIXME: 4k only for now !
  */
 static void native_hpte_clear(void)
 {
 	unsigned long slot, slots, flags;
 	hpte_t *hptep = htab_address;
-	unsigned long hpte_v;
+	unsigned long hpte_v, va;
 	unsigned long pteg_count;
+	int psize;
 
 	pteg_count = htab_hash_mask + 1;
 
@@ -408,8 +447,9 @@ static void native_hpte_clear(void)
 		 * already hold the native_tlbie_lock.
 		 */
 		if (hpte_v & HPTE_V_VALID) {
+			hpte_decode(hptep, slot, &psize, &va);
 			hptep->v = 0;
-			__tlbie(slot2va(hpte_v, slot), MMU_PAGE_4K);
+			__tlbie(va, psize);
 		}
 	}