1 files changed, 223 insertions, 77 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 45d81976987f..16ab40daa738 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -195,11 +195,11 @@ exception_marker:
 #define EX_R12          24
 #define EX_R13          32
 #define EX_SRR0         40
-#define EX_R3           40      /* SLB miss saves R3, but not SRR0 */
 #define EX_DAR          48
-#define EX_LR           48      /* SLB miss saves LR, but not DAR */
 #define EX_DSISR        56
 #define EX_CCR          60
+#define EX_R3           64
+#define EX_LR           72
 
 #define EXCEPTION_PROLOG_PSERIES(area, label)                           \
         mfspr   r13,SPRN_SPRG3;         /* get paca address into r13 */ \
@@ -419,17 +419,22 @@ data_access_slb_pSeries:
         mtspr   SPRN_SPRG1,r13
         RUNLATCH_ON(r13)
         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
+        std     r3,PACA_EXSLB+EX_R3(r13)
+        mfspr   r3,SPRN_DAR
         std     r9,PACA_EXSLB+EX_R9(r13)        /* save r9 - r12 */
+        mfcr    r9
+#ifdef __DISABLED__
+        /* Keep that around for when we re-implement dynamic VSIDs */
+        cmpdi   r3,0
+        bge     slb_miss_user_pseries
+#endif /* __DISABLED__ */
         std     r10,PACA_EXSLB+EX_R10(r13)
         std     r11,PACA_EXSLB+EX_R11(r13)
         std     r12,PACA_EXSLB+EX_R12(r13)
-        std     r3,PACA_EXSLB+EX_R3(r13)
-        mfspr   r9,SPRN_SPRG1
-        std     r9,PACA_EXSLB+EX_R13(r13)
-        mfcr    r9
+        mfspr   r10,SPRN_SPRG1
+        std     r10,PACA_EXSLB+EX_R13(r13)
         mfspr   r12,SPRN_SRR1           /* and SRR1 */
-        mfspr   r3,SPRN_DAR
-        b       .do_slb_miss            /* Rel. branch works in real mode */
+        b       .slb_miss_realmode      /* Rel. branch works in real mode */
 
         STD_EXCEPTION_PSERIES(0x400, instruction_access)
 
@@ -440,17 +445,22 @@ instruction_access_slb_pSeries:
         mtspr   SPRN_SPRG1,r13
         RUNLATCH_ON(r13)
         mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
+        std     r3,PACA_EXSLB+EX_R3(r13)
+        mfspr   r3,SPRN_SRR0            /* SRR0 is faulting address */
         std     r9,PACA_EXSLB+EX_R9(r13)        /* save r9 - r12 */
+        mfcr    r9
+#ifdef __DISABLED__
+        /* Keep that around for when we re-implement dynamic VSIDs */
+        cmpdi   r3,0
+        bge     slb_miss_user_pseries
+#endif /* __DISABLED__ */
         std     r10,PACA_EXSLB+EX_R10(r13)
         std     r11,PACA_EXSLB+EX_R11(r13)
         std     r12,PACA_EXSLB+EX_R12(r13)
-        std     r3,PACA_EXSLB+EX_R3(r13)
-        mfspr   r9,SPRN_SPRG1
-        std     r9,PACA_EXSLB+EX_R13(r13)
-        mfcr    r9
+        mfspr   r10,SPRN_SPRG1
+        std     r10,PACA_EXSLB+EX_R13(r13)
         mfspr   r12,SPRN_SRR1           /* and SRR1 */
-        mfspr   r3,SPRN_SRR0                    /* SRR0 is faulting address */
-        b       .do_slb_miss            /* Rel. branch works in real mode */
+        b       .slb_miss_realmode      /* Rel. branch works in real mode */
 
         STD_EXCEPTION_PSERIES(0x500, hardware_interrupt)
         STD_EXCEPTION_PSERIES(0x600, alignment)
@@ -509,6 +519,38 @@ _GLOBAL(do_stab_bolted_pSeries)
         EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted)
 
 /*
+ * We have some room here  we use that to put
+ * the peries slb miss user trampoline code so it's reasonably
+ * away from slb_miss_user_common to avoid problems with rfid
+ *
+ * This is used for when the SLB miss handler has to go virtual,
+ * which doesn't happen for now anymore but will once we re-implement
+ * dynamic VSIDs for shared page tables
+ */
+#ifdef __DISABLED__
+slb_miss_user_pseries:
+        std     r10,PACA_EXGEN+EX_R10(r13)
+        std     r11,PACA_EXGEN+EX_R11(r13)
+        std     r12,PACA_EXGEN+EX_R12(r13)
+        mfspr   r10,SPRG1
+        ld      r11,PACA_EXSLB+EX_R9(r13)
+        ld      r12,PACA_EXSLB+EX_R3(r13)
+        std     r10,PACA_EXGEN+EX_R13(r13)
+        std     r11,PACA_EXGEN+EX_R9(r13)
+        std     r12,PACA_EXGEN+EX_R3(r13)
+        clrrdi  r12,r13,32
+        mfmsr   r10
+        mfspr   r11,SRR0                        /* save SRR0 */
+        ori     r12,r12,slb_miss_user_common@l  /* virt addr of handler */
+        ori     r10,r10,MSR_IR|MSR_DR|MSR_RI
+        mtspr   SRR0,r12
+        mfspr   r12,SRR1                        /* and SRR1 */
+        mtspr   SRR1,r10
+        rfid
+        b       .                               /* prevent spec. execution */
+#endif /* __DISABLED__ */
+
+/*
  * Vectors for the FWNMI option.  Share common code.
  */
         .globl system_reset_fwnmi
@@ -559,22 +601,59 @@ END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
         .globl  data_access_slb_iSeries
 data_access_slb_iSeries:
         mtspr   SPRN_SPRG1,r13          /* save r13 */
-        EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
+        mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
         std     r3,PACA_EXSLB+EX_R3(r13)
-        ld      r12,PACALPPACA+LPPACASRR1(r13)
         mfspr   r3,SPRN_DAR
-        b       .do_slb_miss
+        std     r9,PACA_EXSLB+EX_R9(r13)
+        mfcr    r9
+#ifdef __DISABLED__
+        cmpdi   r3,0
+        bge     slb_miss_user_iseries
+#endif
+        std     r10,PACA_EXSLB+EX_R10(r13)
+        std     r11,PACA_EXSLB+EX_R11(r13)
+        std     r12,PACA_EXSLB+EX_R12(r13)
+        mfspr   r10,SPRN_SPRG1
+        std     r10,PACA_EXSLB+EX_R13(r13)
+        ld      r12,PACALPPACA+LPPACASRR1(r13);
+        b       .slb_miss_realmode
 
         STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
 
         .globl  instruction_access_slb_iSeries
 instruction_access_slb_iSeries:
         mtspr   SPRN_SPRG1,r13          /* save r13 */
-        EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB)
+        mfspr   r13,SPRN_SPRG3          /* get paca address into r13 */
         std     r3,PACA_EXSLB+EX_R3(r13)
-        ld      r12,PACALPPACA+LPPACASRR1(r13)
-        ld      r3,PACALPPACA+LPPACASRR0(r13)
-        b       .do_slb_miss
+        ld      r3,PACALPPACA+LPPACASRR0(r13)   /* get SRR0 value */
+        std     r9,PACA_EXSLB+EX_R9(r13)
+        mfcr    r9
+#ifdef __DISABLED__
+        cmpdi   r3,0
+        bge     .slb_miss_user_iseries
+#endif
+        std     r10,PACA_EXSLB+EX_R10(r13)
+        std     r11,PACA_EXSLB+EX_R11(r13)
+        std     r12,PACA_EXSLB+EX_R12(r13)
+        mfspr   r10,SPRN_SPRG1
+        std     r10,PACA_EXSLB+EX_R13(r13)
+        ld      r12,PACALPPACA+LPPACASRR1(r13);
+        b       .slb_miss_realmode
+
+#ifdef __DISABLED__
+slb_miss_user_iseries:
+        std     r10,PACA_EXGEN+EX_R10(r13)
+        std     r11,PACA_EXGEN+EX_R11(r13)
+        std     r12,PACA_EXGEN+EX_R12(r13)
+        mfspr   r10,SPRG1
+        ld      r11,PACA_EXSLB+EX_R9(r13)
+        ld      r12,PACA_EXSLB+EX_R3(r13)
+        std     r10,PACA_EXGEN+EX_R13(r13)
+        std     r11,PACA_EXGEN+EX_R9(r13)
+        std     r12,PACA_EXGEN+EX_R3(r13)
+        EXCEPTION_PROLOG_ISERIES_2
+        b       slb_miss_user_common
+#endif
 
         MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt)
         STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN)
@@ -809,6 +888,126 @@ instruction_access_common:
         li      r5,0x400
         b       .do_hash_page           /* Try to handle as hpte fault */
 
+/*
+ * Here is the common SLB miss user that is used when going to virtual
+ * mode for SLB misses, that is currently not used
+ */
+#ifdef __DISABLED__
+        .align  7
+        .globl  slb_miss_user_common
+slb_miss_user_common:
+        mflr    r10
+        std     r3,PACA_EXGEN+EX_DAR(r13)
+        stw     r9,PACA_EXGEN+EX_CCR(r13)
+        std     r10,PACA_EXGEN+EX_LR(r13)
+        std     r11,PACA_EXGEN+EX_SRR0(r13)
+        bl      .slb_allocate_user
+
+        ld      r10,PACA_EXGEN+EX_LR(r13)
+        ld      r3,PACA_EXGEN+EX_R3(r13)
+        lwz     r9,PACA_EXGEN+EX_CCR(r13)
+        ld      r11,PACA_EXGEN+EX_SRR0(r13)
+        mtlr    r10
+        beq-    slb_miss_fault
+
+        andi.   r10,r12,MSR_RI          /* check for unrecoverable exception */
+        beq-    unrecov_user_slb
+        mfmsr   r10
+
+.machine push
+.machine "power4"
+        mtcrf   0x80,r9
+.machine pop
+
+        clrrdi  r10,r10,2               /* clear RI before setting SRR0/1 */
+        mtmsrd  r10,1
+
+        mtspr   SRR0,r11
+        mtspr   SRR1,r12
+
+        ld      r9,PACA_EXGEN+EX_R9(r13)
+        ld      r10,PACA_EXGEN+EX_R10(r13)
+        ld      r11,PACA_EXGEN+EX_R11(r13)
+        ld      r12,PACA_EXGEN+EX_R12(r13)
+        ld      r13,PACA_EXGEN+EX_R13(r13)
+        rfid
+        b       .
+
+slb_miss_fault:
+        EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN)
+        ld      r4,PACA_EXGEN+EX_DAR(r13)
+        li      r5,0
+        std     r4,_DAR(r1)
+        std     r5,_DSISR(r1)
+        b       .handle_page_fault
+
+unrecov_user_slb:
+        EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN)
+        DISABLE_INTS
+        bl      .save_nvgprs
+1:      addi    r3,r1,STACK_FRAME_OVERHEAD
+        bl      .unrecoverable_exception
+        b       1b
+
+#endif /* __DISABLED__ */
+
+
+/*
+ * r13 points to the PACA, r9 contains the saved CR,
+ * r12 contain the saved SRR1, SRR0 is still ready for return
+ * r3 has the faulting address
+ * r9 - r13 are saved in paca->exslb.
+ * r3 is saved in paca->slb_r3
+ * We assume we aren't going to take any exceptions during this procedure.
+ */
+_GLOBAL(slb_miss_realmode)
+        mflr    r10
+
+        stw     r9,PACA_EXSLB+EX_CCR(r13)       /* save CR in exc. frame */
+        std     r10,PACA_EXSLB+EX_LR(r13)       /* save LR */
+
+        bl      .slb_allocate_realmode
+
+        /* All done -- return from exception. */
+
+        ld      r10,PACA_EXSLB+EX_LR(r13)
+        ld      r3,PACA_EXSLB+EX_R3(r13)
+        lwz     r9,PACA_EXSLB+EX_CCR(r13)       /* get saved CR */
+#ifdef CONFIG_PPC_ISERIES
+        ld      r11,PACALPPACA+LPPACASRR0(r13)  /* get SRR0 value */
+#endif /* CONFIG_PPC_ISERIES */
+
+        mtlr    r10
+
+        andi.   r10,r12,MSR_RI  /* check for unrecoverable exception */
+        beq-    unrecov_slb
+
+.machine        push
+.machine        "power4"
+        mtcrf   0x80,r9
+        mtcrf   0x01,r9         /* slb_allocate uses cr0 and cr7 */
+.machine        pop
+
+#ifdef CONFIG_PPC_ISERIES
+        mtspr   SPRN_SRR0,r11
+        mtspr   SPRN_SRR1,r12
+#endif /* CONFIG_PPC_ISERIES */
+        ld      r9,PACA_EXSLB+EX_R9(r13)
+        ld      r10,PACA_EXSLB+EX_R10(r13)
+        ld      r11,PACA_EXSLB+EX_R11(r13)
+        ld      r12,PACA_EXSLB+EX_R12(r13)
+        ld      r13,PACA_EXSLB+EX_R13(r13)
+        rfid
+        b       .       /* prevent speculative execution */
+
+unrecov_slb:
+        EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
+        DISABLE_INTS
+        bl      .save_nvgprs
+1:      addi    r3,r1,STACK_FRAME_OVERHEAD
+        bl      .unrecoverable_exception
+        b       1b
+
         .align  7
         .globl hardware_interrupt_common
         .globl hardware_interrupt_entry
@@ -1139,62 +1338,6 @@ _GLOBAL(do_stab_bolted)
         b       .       /* prevent speculative execution */
 
 /*
- * r13 points to the PACA, r9 contains the saved CR,
- * r11 and r12 contain the saved SRR0 and SRR1.
- * r3 has the faulting address
- * r9 - r13 are saved in paca->exslb.
- * r3 is saved in paca->slb_r3
- * We assume we aren't going to take any exceptions during this procedure.
- */
-_GLOBAL(do_slb_miss)
-        mflr    r10
-
-        stw     r9,PACA_EXSLB+EX_CCR(r13)       /* save CR in exc. frame */
-        std     r10,PACA_EXSLB+EX_LR(r13)       /* save LR */
-
-        bl      .slb_allocate                   /* handle it */
-
-        /* All done -- return from exception. */
-
-        ld      r10,PACA_EXSLB+EX_LR(r13)
-        ld      r3,PACA_EXSLB+EX_R3(r13)
-        lwz     r9,PACA_EXSLB+EX_CCR(r13)       /* get saved CR */
-#ifdef CONFIG_PPC_ISERIES
-        ld      r11,PACALPPACA+LPPACASRR0(r13)  /* get SRR0 value */
-#endif /* CONFIG_PPC_ISERIES */
-
-        mtlr    r10
-
-        andi.   r10,r12,MSR_RI  /* check for unrecoverable exception */
-        beq-    unrecov_slb
-
-.machine        push
-.machine        "power4"
-        mtcrf   0x80,r9
-        mtcrf   0x01,r9         /* slb_allocate uses cr0 and cr7 */
-.machine        pop
-
-#ifdef CONFIG_PPC_ISERIES
-        mtspr   SPRN_SRR0,r11
-        mtspr   SPRN_SRR1,r12
-#endif /* CONFIG_PPC_ISERIES */
-        ld      r9,PACA_EXSLB+EX_R9(r13)
-        ld      r10,PACA_EXSLB+EX_R10(r13)
-        ld      r11,PACA_EXSLB+EX_R11(r13)
-        ld      r12,PACA_EXSLB+EX_R12(r13)
-        ld      r13,PACA_EXSLB+EX_R13(r13)
-        rfid
-        b       .       /* prevent speculative execution */
-
-unrecov_slb:
-        EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
-        DISABLE_INTS
-        bl      .save_nvgprs
-1:      addi    r3,r1,STACK_FRAME_OVERHEAD
-        bl      .unrecoverable_exception
-        b       1b
-
-/*
  * Space for CPU0's segment table.
  *
  * On iSeries, the hypervisor must fill in at least one entry before
@@ -1569,7 +1712,10 @@ _GLOBAL(__secondary_start)
 #endif
         /* Initialize the first segment table (or SLB) entry             */
         ld      r3,PACASTABVIRT(r13)    /* get addr of segment table     */
+BEGIN_FTR_SECTION
         bl      .stab_initialize
+END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
+        bl      .slb_initialize
 
         /* Initialize the kernel stack.  Just a repeat for iSeries.      */
         LOADADDR(r3,current_set)