[SPARC64]: Preserve nucleus ctx page size during TLB flushes.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 14 deletions

diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S
index 363770893797..8dfa825eca51 100644
--- a/arch/sparc64/mm/ultra.S
+++ b/arch/sparc64/mm/ultra.S
@@ -10,6 +10,7 @@
 #include <asm/page.h>
 #include <asm/spitfire.h>
 #include <asm/mmu_context.h>
+#include <asm/mmu.h>
 #include <asm/pil.h>
 #include <asm/head.h>
 #include <asm/thread_info.h>
@@ -45,6 +46,8 @@ __flush_tlb_mm: /* %o0=(ctx & TAG_CONTEXT_BITS), %o1=SECONDARY_CONTEXT */
         nop
         nop
         nop
+        nop
+        nop
 
         .align          32
         .globl          __flush_tlb_pending
@@ -73,6 +76,9 @@ __flush_tlb_pending:
         retl
          wrpr           %g7, 0x0, %pstate
         nop
+        nop
+        nop
+        nop
 
         .align          32
         .globl          __flush_tlb_kernel_range
@@ -224,16 +230,8 @@ __update_mmu_cache:	/* %o0=hw_context, %o1=address, %o2=pte, %o3=fault_code */
          or             %o5, %o0, %o5
         ba,a,pt         %xcc, __prefill_itlb
 
-        /* Cheetah specific versions, patched at boot time.
-         *
-         * This writes of the PRIMARY_CONTEXT register in this file are
-         * safe even on Cheetah+ and later wrt. the page size fields.
-         * The nucleus page size fields do not matter because we make
-         * no data references, and these instructions execute out of a
-         * locked I-TLB entry sitting in the fully assosciative I-TLB.
-         * This sequence should also never trap.
-         */
-__cheetah_flush_tlb_mm: /* 15 insns */
+        /* Cheetah specific versions, patched at boot time. */
+__cheetah_flush_tlb_mm: /* 18 insns */
         rdpr            %pstate, %g7
         andn            %g7, PSTATE_IE, %g2
         wrpr            %g2, 0x0, %pstate
@@ -241,6 +239,9 @@ __cheetah_flush_tlb_mm: /* 15 insns */
         mov             PRIMARY_CONTEXT, %o2
         mov             0x40, %g3
         ldxa            [%o2] ASI_DMMU, %g2
+        srlx            %g2, CTX_PGSZ1_NUC_SHIFT, %o1
+        sllx            %o1, CTX_PGSZ1_NUC_SHIFT, %o1
+        or              %o0, %o1, %o0   /* Preserve nucleus page size fields */
         stxa            %o0, [%o2] ASI_DMMU
         stxa            %g0, [%g3] ASI_DMMU_DEMAP
         stxa            %g0, [%g3] ASI_IMMU_DEMAP
@@ -250,7 +251,7 @@ __cheetah_flush_tlb_mm: /* 15 insns */
         retl
          wrpr           %g7, 0x0, %pstate
 
-__cheetah_flush_tlb_pending:    /* 23 insns */
+__cheetah_flush_tlb_pending:    /* 26 insns */
         /* %o0 = context, %o1 = nr, %o2 = vaddrs[] */
         rdpr            %pstate, %g7
         sllx            %o1, 3, %o1
@@ -259,6 +260,9 @@ __cheetah_flush_tlb_pending:	/* 23 insns */
         wrpr            %g0, 1, %tl
         mov             PRIMARY_CONTEXT, %o4
         ldxa            [%o4] ASI_DMMU, %g2
+        srlx            %g2, CTX_PGSZ1_NUC_SHIFT, %o3
+        sllx            %o3, CTX_PGSZ1_NUC_SHIFT, %o3
+        or              %o0, %o3, %o0   /* Preserve nucleus page size fields */
         stxa            %o0, [%o4] ASI_DMMU
 1:      sub             %o1, (1 << 3), %o1
         ldx             [%o2 + %o1], %o3
@@ -311,14 +315,14 @@ cheetah_patch_cachetlbops:
         sethi           %hi(__cheetah_flush_tlb_mm), %o1
         or              %o1, %lo(__cheetah_flush_tlb_mm), %o1
         call            cheetah_patch_one
-         mov            15, %o2
+         mov            18, %o2
 
         sethi           %hi(__flush_tlb_pending), %o0
         or              %o0, %lo(__flush_tlb_pending), %o0
         sethi           %hi(__cheetah_flush_tlb_pending), %o1
         or              %o1, %lo(__cheetah_flush_tlb_pending), %o1
         call            cheetah_patch_one
-         mov            23, %o2
+         mov            26, %o2
 
 #ifdef DCACHE_ALIASING_POSSIBLE
         sethi           %hi(__flush_dcache_page), %o0
@@ -352,9 +356,12 @@ cheetah_patch_cachetlbops:
         .globl          xcall_flush_tlb_mm
 xcall_flush_tlb_mm:
         mov             PRIMARY_CONTEXT, %g2
-        mov             0x40, %g4
         ldxa            [%g2] ASI_DMMU, %g3
+        srlx            %g3, CTX_PGSZ1_NUC_SHIFT, %g4
+        sllx            %g4, CTX_PGSZ1_NUC_SHIFT, %g4
+        or              %g5, %g4, %g5   /* Preserve nucleus page size fields */
         stxa            %g5, [%g2] ASI_DMMU
+        mov             0x40, %g4
         stxa            %g0, [%g4] ASI_DMMU_DEMAP
         stxa            %g0, [%g4] ASI_IMMU_DEMAP
         stxa            %g3, [%g2] ASI_DMMU
@@ -366,6 +373,10 @@ xcall_flush_tlb_pending:
         sllx            %g1, 3, %g1
         mov             PRIMARY_CONTEXT, %g4
         ldxa            [%g4] ASI_DMMU, %g2
+        srlx            %g2, CTX_PGSZ1_NUC_SHIFT, %g4
+        sllx            %g4, CTX_PGSZ1_NUC_SHIFT, %g4
+        or              %g5, %g4, %g5
+        mov             PRIMARY_CONTEXT, %g4
         stxa            %g5, [%g4] ASI_DMMU
 1:      sub             %g1, (1 << 3), %g1
         ldx             [%g7 + %g1], %g5