[SPARC64]: Elminate all usage of hard-coded trap globals.

UltraSPARC has special sets of global registers which are switched to
for certain trap types.  There is one set for MMU related traps, one
set of Interrupt Vector processing, and another set (called the
Alternate globals) for all other trap types.

For what seems like forever we've hard coded the values in some of
these trap registers.  Some examples include:

1) Interrupt Vector global %g6 holds current processors interrupt
   work struct where received interrupts are managed for IRQ handler
   dispatch.

2) MMU global %g7 holds the base of the page tables of the currently
   active address space.

3) Alternate global %g6 held the current_thread_info() value.

Such hardcoding has resulted in some serious issues in many areas.
There are some code sequences where having another register available
would help clean up the implementation.  Taking traps such as
cross-calls from the OBP firmware requires some trick code sequences
wherein we have to save away and restore all of the special sets of
global registers when we enter/exit OBP.

We were also using the IMMU TSB register on SMP to hold the per-cpu
area base address, which doesn't work any longer now that we actually
use the TSB facility of the cpu.

The implementation is pretty straight forward.  One tricky bit is
getting the current processor ID as that is different on different cpu
variants.  We use a stub with a fancy calling convention which we
patch at boot time.  The calling convention is that the stub is
branched to and the (PC - 4) to return to is in register %g1.  The cpu
number is left in %g6.  This stub can be invoked by using the
__GET_CPUID macro.

We use an array of per-cpu trap state to store the current thread and
physical address of the current address space's page tables.  The
TRAP_LOAD_THREAD_REG loads %g6 with the current thread from this
table, it uses __GET_CPUID and also clobbers %g1.

TRAP_LOAD_IRQ_WORK is used by the interrupt vector processing to load
the current processor's IRQ software state into %g6.  It also uses
__GET_CPUID and clobbers %g1.

Finally, TRAP_LOAD_PGD_PHYS loads the physical address base of the
current address space's page tables into %g7, it clobbers %g1 and uses
__GET_CPUID.

Many refinements are possible, as well as some tuning, with this stuff
in place.

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

12 files changed, 188 insertions, 151 deletions

diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index a73553ae7e5..906b64ffdb1 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -50,7 +50,8 @@ do_fpdis:
         add             %g0, %g0, %g0
         ba,a,pt         %xcc, rtrap_clr_l6
 
-1:      ldub            [%g6 + TI_FPSAVED], %g5
+1:      TRAP_LOAD_THREAD_REG
+        ldub            [%g6 + TI_FPSAVED], %g5
         wr              %g0, FPRS_FEF, %fprs
         andcc           %g5, FPRS_FEF, %g0
         be,a,pt         %icc, 1f
@@ -189,6 +190,7 @@ fp_other_bounce:
         .globl          do_fpother_check_fitos
         .align          32
 do_fpother_check_fitos:
+        TRAP_LOAD_THREAD_REG
         sethi           %hi(fp_other_bounce - 4), %g7
         or              %g7, %lo(fp_other_bounce - 4), %g7
 
@@ -353,8 +355,6 @@ do_fptrap_after_fsr:
          *
          * With this method we can do most of the cross-call tlb/cache
          * flushing very quickly.
-         *
-         * Current CPU's IRQ worklist table is locked into %g6, don't touch.
          */
         .text
         .align          32
@@ -378,6 +378,8 @@ do_ivec:
         sllx            %g2, %g4, %g2
         sllx            %g4, 2, %g4
 
+        TRAP_LOAD_IRQ_WORK
+
         lduw            [%g6 + %g4], %g5        /* g5 = irq_work(cpu, pil) */
         stw             %g5, [%g3 + 0x00]       /* bucket->irq_chain = g5 */
         stw             %g3, [%g6 + %g4]        /* irq_work(cpu, pil) = bucket */
@@ -488,9 +490,24 @@ setcc:
         retl
          stx            %o1, [%o0 + PT_V9_TSTATE]
 
-        .globl          utrap, utrap_ill
-utrap:  brz,pn          %g1, etrap
+        .globl          utrap_trap
+utrap_trap:             /* %g3=handler,%g4=level */
+        TRAP_LOAD_THREAD_REG
+        ldx             [%g6 + TI_UTRAPS], %g1
+        brnz,pt         %g1, invoke_utrap
          nop
+
+        ba,pt           %xcc, etrap
+         rd             %pc, %g7
+        mov             %l4, %o1
+        call            bad_trap
+         add            %sp, PTREGS_OFF, %o0
+        ba,pt           %xcc, rtrap
+         clr            %l6
+
+invoke_utrap:
+        sllx            %g3, 3, %g3
+        ldx             [%g1 + %g3], %g1
         save            %sp, -128, %sp
         rdpr            %tstate, %l6
         rdpr            %cwp, %l7
@@ -500,17 +517,6 @@ utrap:	brz,pn		%g1, etrap
         rdpr            %tnpc, %l7
         wrpr            %g1, 0, %tnpc
         done
-utrap_ill:
-        call            bad_trap
-         add            %sp, PTREGS_OFF, %o0
-        ba,pt           %xcc, rtrap
-         clr            %l6
-
-        /* XXX Here is stuff we still need to write... -DaveM XXX */
-        .globl          netbsd_syscall
-netbsd_syscall:
-        retl
-         nop
 
         /* We need to carefully read the error status, ACK
          * the errors, prevent recursive traps, and pass the
@@ -1001,7 +1007,7 @@ dcpe_icpe_tl1_common:
          * %g3:         scratch
          * %g4:         AFSR
          * %g5:         AFAR
-         * %g6:         current thread ptr
+         * %g6:         unused, will have current thread ptr after etrap
          * %g7:         scratch
          */
 __cheetah_log_error:
@@ -1690,3 +1696,85 @@ __flushw_user:
          restore        %g0, %g0, %g0
 2:      retl
          nop
+
+        /* Read cpu ID from hardware, return in %g6.
+         * (callers_pc - 4) is in %g1.  Patched at boot time.
+         *
+         * Default is spitfire implementation.
+         *
+         * The instruction sequence needs to be 5 instructions
+         * in order to fit the longest implementation, which is
+         * currently starfire.
+         */
+        .align          32
+        .globl          __get_cpu_id
+__get_cpu_id:
+        ldxa            [%g0] ASI_UPA_CONFIG, %g6
+        srlx            %g6, 17, %g6
+        jmpl            %g1 + 0x4, %g0
+         and            %g6, 0x1f, %g6
+        nop
+
+__get_cpu_id_cheetah_safari:
+        ldxa            [%g0] ASI_SAFARI_CONFIG, %g6
+        srlx            %g6, 17, %g6
+        jmpl            %g1 + 0x4, %g0
+         and            %g6, 0x3ff, %g6
+        nop
+
+__get_cpu_id_cheetah_jbus:
+        ldxa            [%g0] ASI_JBUS_CONFIG, %g6
+        srlx            %g6, 17, %g6
+        jmpl            %g1 + 0x4, %g0
+         and            %g6, 0x1f, %g6
+        nop
+
+__get_cpu_id_starfire:
+        sethi           %hi(0x1fff40000d0 >> 9), %g6
+        sllx            %g6, 9, %g6
+        or              %g6, 0xd0, %g6
+        jmpl            %g1 + 0x4, %g0
+         lduwa          [%g6] ASI_PHYS_BYPASS_EC_E, %g6
+
+        .globl          per_cpu_patch
+per_cpu_patch:
+        sethi           %hi(this_is_starfire), %o0
+        lduw            [%o0 + %lo(this_is_starfire)], %o1
+        sethi           %hi(__get_cpu_id_starfire), %o0
+        brnz,pn         %o1, 10f
+         or             %o0, %lo(__get_cpu_id_starfire), %o0
+        sethi           %hi(tlb_type), %o0
+        lduw            [%o0 + %lo(tlb_type)], %o1
+        brz,pt          %o1, 11f
+         nop
+        rdpr            %ver, %o0
+        srlx            %o0, 32, %o0
+        sethi           %hi(0x003e0016), %o1
+        or              %o1, %lo(0x003e0016), %o1
+        cmp             %o0, %o1
+        sethi           %hi(__get_cpu_id_cheetah_jbus), %o0
+        be,pn           %icc, 10f
+         or             %o0, %lo(__get_cpu_id_cheetah_jbus), %o0
+        sethi           %hi(__get_cpu_id_cheetah_safari), %o0
+        or              %o0, %lo(__get_cpu_id_cheetah_safari), %o0
+10:
+        sethi           %hi(__get_cpu_id), %o1
+        or              %o1, %lo(__get_cpu_id), %o1
+        lduw            [%o0 + 0x00], %o2
+        stw             %o2, [%o1 + 0x00]
+        flush           %o1 + 0x00
+        lduw            [%o0 + 0x04], %o2
+        stw             %o2, [%o1 + 0x04]
+        flush           %o1 + 0x04
+        lduw            [%o0 + 0x08], %o2
+        stw             %o2, [%o1 + 0x08]
+        flush           %o1 + 0x08
+        lduw            [%o0 + 0x0c], %o2
+        stw             %o2, [%o1 + 0x0c]
+        flush           %o1 + 0x0c
+        lduw            [%o0 + 0x10], %o2
+        stw             %o2, [%o1 + 0x10]
+        flush           %o1 + 0x10
+11:
+        retl
+         nop
diff --git a/arch/sparc64/kernel/etrap.S b/arch/sparc64/kernel/etrap.S
index 567dbb765c3..8b3b6d720ed 100644
--- a/arch/sparc64/kernel/etrap.S
+++ b/arch/sparc64/kernel/etrap.S
@@ -31,6 +31,7 @@
                 .globl  etrap, etrap_irq, etraptl1
 etrap:          rdpr    %pil, %g2
 etrap_irq:
+                TRAP_LOAD_THREAD_REG
                 rdpr    %tstate, %g1
                 sllx    %g2, 20, %g3
                 andcc   %g1, TSTATE_PRIV, %g0
@@ -98,11 +99,7 @@ etrap_irq:
                 stx     %i7, [%sp + PTREGS_OFF + PT_V9_I7]
                 wrpr    %g0, ETRAP_PSTATE2, %pstate
                 mov     %l6, %g6
-#ifdef CONFIG_SMP
-#error IMMU TSB usage must be fixed
-                mov     TSB_REG, %g3
-                ldxa    [%g3] ASI_IMMU, %g5
-#endif
+                LOAD_PER_CPU_BASE(%g4, %g3)
                 jmpl    %l2 + 0x4, %g0
                  ldx    [%g6 + TI_TASK], %g4
 
@@ -126,6 +123,7 @@ etraptl1:	/* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
                  *      0x58    TL4's TT
                  *      0x60    TL
                  */
+                TRAP_LOAD_THREAD_REG
                 sub     %sp, ((4 * 8) * 4) + 8, %g2
                 rdpr    %tl, %g1
 
@@ -179,7 +177,9 @@ etraptl1:	/* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
 
                 .align  64
                 .globl  scetrap
-scetrap:        rdpr    %pil, %g2
+scetrap:
+                TRAP_LOAD_THREAD_REG
+                rdpr    %pil, %g2
                 rdpr    %tstate, %g1
                 sllx    %g2, 20, %g3
                 andcc   %g1, TSTATE_PRIV, %g0
@@ -248,11 +248,7 @@ scetrap:	rdpr	%pil, %g2
                 stx     %i6, [%sp + PTREGS_OFF + PT_V9_I6]
                 mov     %l6, %g6
                 stx     %i7, [%sp + PTREGS_OFF + PT_V9_I7]
-#ifdef CONFIG_SMP
-#error IMMU TSB usage must be fixed
-                mov     TSB_REG, %g3
-                ldxa    [%g3] ASI_IMMU, %g5
-#endif
+                LOAD_PER_CPU_BASE(%g4, %g3)
                 ldx     [%g6 + TI_TASK], %g4
                 done
 
diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index d00e20693be..82ce5bced9c 100644
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -26,6 +26,7 @@
 #include <asm/head.h>
 #include <asm/ttable.h>
 #include <asm/mmu.h>
+#include <asm/cpudata.h>
         
 /* This section from from _start to sparc64_boot_end should fit into
  * 0x0000000000404000 to 0x0000000000408000.
@@ -421,24 +422,6 @@ setup_trap_table:
         stxa    %g2, [%g1] ASI_DMMU
         membar  #Sync
 
-        /* The Linux trap handlers expect various trap global registers
-         * to be setup with some fixed values.  So here we set these
-         * up very carefully.  These globals are:
-         *
-         * Alternate Globals (PSTATE_AG):
-         *
-         * %g6                  --> current_thread_info()
-         *
-         * Interrupt Globals (PSTATE_IG, setup by init_irqwork_curcpu()):
-         *
-         * %g6                  --> __irq_work[smp_processor_id()]
-         */
-
-        rdpr    %pstate, %o1
-        mov     %g6, %o2
-        wrpr    %o1, PSTATE_AG, %pstate
-        mov     %o2, %g6
-
         /* Kill PROM timer */
         sethi   %hi(0x80000000), %o2
         sllx    %o2, 32, %o2
@@ -457,7 +440,6 @@ setup_trap_table:
 
 2:
         wrpr    %g0, %g0, %wstate
-        wrpr    %o1, 0x0, %pstate
 
         call    init_irqwork_curcpu
          nop
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index f7490ef629b..3e48af2769d 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -848,33 +848,9 @@ static void kill_prom_timer(void)
 
 void init_irqwork_curcpu(void)
 {
-        register struct irq_work_struct *workp asm("o2");
-        register unsigned long tmp asm("o3");
         int cpu = hard_smp_processor_id();
 
-        memset(__irq_work + cpu, 0, sizeof(*workp));
-
-        /* Make sure we are called with PSTATE_IE disabled.  */
-        __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
-                             : "=r" (tmp));
-        if (tmp & PSTATE_IE) {
-                prom_printf("BUG: init_irqwork_curcpu() called with "
-                            "PSTATE_IE enabled, bailing.\n");
-                __asm__ __volatile__("mov       %%i7, %0\n\t"
-                                     : "=r" (tmp));
-                prom_printf("BUG: Called from %lx\n", tmp);
-                prom_halt();
-        }
-
-        /* Set interrupt globals.  */
-        workp = &__irq_work[cpu];
-        __asm__ __volatile__(
-        "rdpr   %%pstate, %0\n\t"
-        "wrpr   %0, %1, %%pstate\n\t"
-        "mov    %2, %%g6\n\t"
-        "wrpr   %0, 0x0, %%pstate\n\t"
-        : "=&r" (tmp)
-        : "i" (PSTATE_IG), "r" (workp));
+        memset(__irq_work + cpu, 0, sizeof(struct irq_work_struct));
 }
 
 /* Only invoked on boot processor. */
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index 213eb4a9d8a..5a62ec5d531 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -223,12 +223,10 @@ rt_continue:	ldx			[%sp + PTREGS_OFF + PT_V9_G1], %g1
                 ldx                     [%sp + PTREGS_OFF + PT_V9_G3], %g3
                 ldx                     [%sp + PTREGS_OFF + PT_V9_G4], %g4
                 ldx                     [%sp + PTREGS_OFF + PT_V9_G5], %g5
-#ifdef CONFIG_SMP
-#error IMMU TSB usage must be fixed
-                mov                     TSB_REG, %g6
-                brnz,a,pn               %l3, 1f
-                 ldxa                   [%g6] ASI_IMMU, %g5
-#endif
+                brz,pt                  %l3, 1f
+                 nop
+                /* Must do this before thread reg is clobbered below.  */
+                LOAD_PER_CPU_BASE(%g6, %g7)
 1:
                 ldx                     [%sp + PTREGS_OFF + PT_V9_G6], %g6
                 ldx                     [%sp + PTREGS_OFF + PT_V9_G7], %g7
diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 158bd31e15b..59a70301a6c 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -507,6 +507,11 @@ void __init setup_arch(char **cmdline_p)
         /* Work out if we are starfire early on */
         check_if_starfire();
 
+        /* Now we know enough to patch the __get_cpu_id()
+         * trampoline used by trap code.
+         */
+        per_cpu_patch();
+
         boot_flags_init(*cmdline_p);
 
         idprom_init();
@@ -545,6 +550,9 @@ void __init setup_arch(char **cmdline_p)
         smp_setup_cpu_possible_map();
 
         paging_init();
+
+        /* Get boot processor trap_block[] setup.  */
+        init_cur_cpu_trap();
 }
 
 static int __init set_preferred_console(void)
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index d2d3369e7b5..8c245859d21 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -38,6 +38,7 @@
 #include <asm/timer.h>
 #include <asm/starfire.h>
 #include <asm/tlb.h>
+#include <asm/sections.h>
 
 extern void calibrate_delay(void);
 
@@ -87,10 +88,6 @@ void __init smp_store_cpu_info(int id)
         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
                                                      "clock-frequency", 0);
 
-        cpu_data(id).pgcache_size               = 0;
-        cpu_data(id).pte_cache[0]               = NULL;
-        cpu_data(id).pte_cache[1]               = NULL;
-        cpu_data(id).pgd_cache                  = NULL;
         cpu_data(id).idle_volume                = 1;
 
         cpu_data(id).dcache_size = prom_getintdefault(cpu_node, "dcache-size",
@@ -121,26 +118,15 @@ static volatile unsigned long callin_flag = 0;
 
 extern void inherit_locked_prom_mappings(int save_p);
 
-static inline void cpu_setup_percpu_base(unsigned long cpu_id)
-{
-#error IMMU TSB usage must be fixed
-        __asm__ __volatile__("mov       %0, %%g5\n\t"
-                             "stxa      %0, [%1] %2\n\t"
-                             "membar    #Sync"
-                             : /* no outputs */
-                             : "r" (__per_cpu_offset(cpu_id)),
-                               "r" (TSB_REG), "i" (ASI_IMMU));
-}
-
 void __init smp_callin(void)
 {
         int cpuid = hard_smp_processor_id();
 
         inherit_locked_prom_mappings(0);
 
-        __flush_tlb_all();
+        __local_per_cpu_offset = __per_cpu_offset(cpuid);
 
-        cpu_setup_percpu_base(cpuid);
+        __flush_tlb_all();
 
         smp_setup_percpu_timer();
 
@@ -1107,12 +1093,15 @@ void __init smp_setup_cpu_possible_map(void)
 
 void __devinit smp_prepare_boot_cpu(void)
 {
-        if (hard_smp_processor_id() >= NR_CPUS) {
+        int cpu = hard_smp_processor_id();
+
+        if (cpu >= NR_CPUS) {
                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
                 prom_halt();
         }
 
-        current_thread_info()->cpu = hard_smp_processor_id();
+        current_thread_info()->cpu = cpu;
+        __local_per_cpu_offset = __per_cpu_offset(cpu);
 
         cpu_set(smp_processor_id(), cpu_online_map);
         cpu_set(smp_processor_id(), phys_cpu_present_map);
@@ -1173,12 +1162,9 @@ void __init setup_per_cpu_areas(void)
 {
         unsigned long goal, size, i;
         char *ptr;
-        /* Created by linker magic */
-        extern char __per_cpu_start[], __per_cpu_end[];
 
         /* Copy section for each CPU (we discard the original) */
-        goal = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
-
+        goal = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
 #ifdef CONFIG_MODULES
         if (goal < PERCPU_ENOUGH_ROOM)
                 goal = PERCPU_ENOUGH_ROOM;
@@ -1187,31 +1173,10 @@ void __init setup_per_cpu_areas(void)
         for (size = 1UL; size < goal; size <<= 1UL)
                 __per_cpu_shift++;
 
-        /* Make sure the resulting __per_cpu_base value
-         * will fit in the 43-bit sign extended IMMU
-         * TSB register.
-         */
-        ptr = __alloc_bootmem(size * NR_CPUS, PAGE_SIZE,
-                              (unsigned long) __per_cpu_start);
+        ptr = alloc_bootmem(size * NR_CPUS);
 
         __per_cpu_base = ptr - __per_cpu_start;
 
-        if ((__per_cpu_shift < PAGE_SHIFT) ||
-            (__per_cpu_base & ~PAGE_MASK) ||
-            (__per_cpu_base != (((long) __per_cpu_base << 20) >> 20))) {
-                prom_printf("PER_CPU: Invalid layout, "
-                            "ptr[%p] shift[%lx] base[%lx]\n",
-                            ptr, __per_cpu_shift, __per_cpu_base);
-                prom_halt();
-        }
-
         for (i = 0; i < NR_CPUS; i++, ptr += size)
                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
-
-        /* Finally, load in the boot cpu's base value.
-         * We abuse the IMMU TSB register for trap handler
-         * entry and exit loading of %g5.  That is why it
-         * has to be page aligned.
-         */
-        cpu_setup_percpu_base(hard_smp_processor_id());
 }
diff --git a/arch/sparc64/kernel/trampoline.S b/arch/sparc64/kernel/trampoline.S
index 782d8c4973e..18c333f841e 100644
--- a/arch/sparc64/kernel/trampoline.S
+++ b/arch/sparc64/kernel/trampoline.S
@@ -287,21 +287,18 @@ do_unlock:
         wrpr            %g0, 0, %wstate
         wrpr            %g0, 0, %tl
 
-        /* Setup the trap globals, then we can resurface. */
-        rdpr            %pstate, %o1
-        mov             %g6, %o2
-        wrpr            %o1, PSTATE_AG, %pstate
+        /* Load TBA, then we can resurface. */
         sethi           %hi(sparc64_ttable_tl0), %g5
         wrpr            %g5, %tba
-        mov             %o2, %g6
 
-        wrpr            %o1, 0x0, %pstate
         ldx             [%g6 + TI_TASK], %g4
 
         wrpr            %g0, 0, %wstate
 
         call            init_irqwork_curcpu
          nop
+        call            init_cur_cpu_trap
+         nop
 
         /* Start using proper page size encodings in ctx register.  */
         sethi   %hi(sparc64_kern_pri_context), %g3
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 8d44ae5a15e..f47f4874253 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -2130,7 +2130,22 @@ void do_getpsr(struct pt_regs *regs)
         }
 }
 
+struct trap_per_cpu trap_block[NR_CPUS];
+
+/* This can get invoked before sched_init() so play it super safe
+ * and use hard_smp_processor_id().
+ */
+void init_cur_cpu_trap(void)
+{
+        int cpu = hard_smp_processor_id();
+        struct trap_per_cpu *p = &trap_block[cpu];
+
+        p->thread = current_thread_info();
+        p->pgd_paddr = 0;
+}
+
 extern void thread_info_offsets_are_bolixed_dave(void);
+extern void trap_per_cpu_offsets_are_bolixed_dave(void);
 
 /* Only invoked on boot processor. */
 void __init trap_init(void)
@@ -2165,6 +2180,10 @@ void __init trap_init(void)
             (TI_FPREGS & (64 - 1)))
                 thread_info_offsets_are_bolixed_dave();
 
+        if (TRAP_PER_CPU_THREAD != offsetof(struct trap_per_cpu, thread) ||
+            TRAP_PER_CPU_PGD_PADDR != offsetof(struct trap_per_cpu, pgd_paddr))
+                trap_per_cpu_offsets_are_bolixed_dave();
+
         /* Attach to the address space of init_task.  On SMP we
          * do this in smp.c:smp_callin for other cpus.
          */
diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S
index 44b9e6fed09..50752c51877 100644
--- a/arch/sparc64/kernel/tsb.S
+++ b/arch/sparc64/kernel/tsb.S
@@ -36,6 +36,15 @@ tsb_miss_itlb:
          nop
 
 tsb_miss_page_table_walk:
+        /* This clobbers %g1 and %g6, preserve them... */
+        mov             %g1, %g5
+        mov             %g6, %g2
+
+        TRAP_LOAD_PGD_PHYS
+
+        mov             %g2, %g6
+        mov             %g5, %g1
+
         USER_PGTABLE_WALK_TL1(%g4, %g7, %g5, %g2, tsb_do_fault)
 
 tsb_reload:
@@ -112,15 +121,20 @@ winfix_trampoline:
          * %o0: page table physical address
          * %o1: TSB address
          */
+        .align  32
         .globl  tsb_context_switch
 tsb_context_switch:
-        wrpr    %g0, PSTATE_MG | PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV, %pstate
+        rdpr    %pstate, %o5
+        wrpr    %o5, PSTATE_IE, %pstate
 
-        /* Set page table base alternate global.  */
-        mov     %o0, %g7
+        ldub    [%g6 + TI_CPU], %o3
+        sethi   %hi(trap_block), %o4
+        sllx    %o3, TRAP_BLOCK_SZ_SHIFT, %o3
+        or      %o4, %lo(trap_block), %o4
+        add     %o4, %o3, %o4
+        stx     %o0, [%o4 + TRAP_PER_CPU_PGD_PADDR]
 
-        /* XXX can this happen?  */
-        brz,pn  %o1, 9f
+        brgez   %o1, 9f
          nop
 
         /* Lock TSB into D-TLB.  */
@@ -163,7 +177,7 @@ tsb_context_switch:
         membar          #Sync
 
 9:
-        wrpr    %g0, PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE, %pstate
+        wrpr    %o5, %pstate
 
         retl
          mov    %o2, %o0
diff --git a/arch/sparc64/kernel/ttable.S b/arch/sparc64/kernel/ttable.S
index 56f060c8fbf..2fb7a33993c 100644
--- a/arch/sparc64/kernel/ttable.S
+++ b/arch/sparc64/kernel/ttable.S
@@ -128,7 +128,7 @@ tl0_flushw:	FLUSH_WINDOW_TRAP
 tl0_resv104:    BTRAP(0x104) BTRAP(0x105) BTRAP(0x106) BTRAP(0x107)
                 .globl tl0_solaris
 tl0_solaris:    SOLARIS_SYSCALL_TRAP
-tl0_netbsd:     NETBSD_SYSCALL_TRAP
+tl0_resv109:    BTRAP(0x109)
 tl0_resv10a:    BTRAP(0x10a) BTRAP(0x10b) BTRAP(0x10c) BTRAP(0x10d) BTRAP(0x10e)
 tl0_resv10f:    BTRAP(0x10f)
 tl0_linux32:    LINUX_32BIT_SYSCALL_TRAP
diff --git a/arch/sparc64/kernel/winfixup.S b/arch/sparc64/kernel/winfixup.S
index f5d93aa99cb..de588036df4 100644
--- a/arch/sparc64/kernel/winfixup.S
+++ b/arch/sparc64/kernel/winfixup.S
@@ -39,6 +39,7 @@ set_pcontext:
          */
         .globl  fill_fixup, spill_fixup
 fill_fixup:
+        TRAP_LOAD_THREAD_REG
         rdpr            %tstate, %g1
         andcc           %g1, TSTATE_PRIV, %g0
         or              %g4, FAULT_CODE_WINFIXUP, %g4
@@ -84,11 +85,7 @@ fill_fixup:
         wrpr            %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
         mov             %o7, %g6
         ldx             [%g6 + TI_TASK], %g4
-#ifdef CONFIG_SMP
-#error IMMU TSB usage must be fixed
-        mov             TSB_REG, %g1
-        ldxa            [%g1] ASI_IMMU, %g5
-#endif
+        LOAD_PER_CPU_BASE(%g1, %g2)
 
         /* This is the same as below, except we handle this a bit special
          * since we must preserve %l5 and %l6, see comment above.
@@ -107,6 +104,7 @@ fill_fixup:
          * do not touch %g7 or %g2 so we handle the two cases fine.
          */
 spill_fixup:
+        TRAP_LOAD_THREAD_REG
         ldx             [%g6 + TI_FLAGS], %g1
         andcc           %g1, _TIF_32BIT, %g0
         ldub            [%g6 + TI_WSAVED], %g1
@@ -182,6 +180,7 @@ winfix_mna:
         wrpr            %g3, %tnpc
         done
 fill_fixup_mna:
+        TRAP_LOAD_THREAD_REG
         rdpr            %tstate, %g1
         andcc           %g1, TSTATE_PRIV, %g0
         be,pt           %xcc, window_mna_from_user_common
@@ -209,17 +208,14 @@ fill_fixup_mna:
         wrpr            %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
         mov             %o7, %g6                        ! Get current back.
         ldx             [%g6 + TI_TASK], %g4            ! Finish it.
-#ifdef CONFIG_SMP
-#error IMMU TSB usage must be fixed
-        mov             TSB_REG, %g1
-        ldxa            [%g1] ASI_IMMU, %g5
-#endif
+        LOAD_PER_CPU_BASE(%g1, %g2)
         call            mem_address_unaligned
          add            %sp, PTREGS_OFF, %o0
 
         b,pt            %xcc, rtrap
          nop                                            ! yes, the nop is correct
 spill_fixup_mna:
+        TRAP_LOAD_THREAD_REG
         ldx             [%g6 + TI_FLAGS], %g1
         andcc           %g1, _TIF_32BIT, %g0
         ldub            [%g6 + TI_WSAVED], %g1
@@ -287,6 +283,7 @@ winfix_dax:
         wrpr            %g3, %tnpc
         done
 fill_fixup_dax:
+        TRAP_LOAD_THREAD_REG
         rdpr            %tstate, %g1
         andcc           %g1, TSTATE_PRIV, %g0
         be,pt           %xcc, window_dax_from_user_common
@@ -314,17 +311,14 @@ fill_fixup_dax:
         wrpr            %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
         mov             %o7, %g6                        ! Get current back.
         ldx             [%g6 + TI_TASK], %g4            ! Finish it.
-#ifdef CONFIG_SMP
-#error IMMU TSB usage must be fixed
-        mov             TSB_REG, %g1
-        ldxa            [%g1] ASI_IMMU, %g5
-#endif
+        LOAD_PER_CPU_BASE(%g1, %g2)
         call            spitfire_data_access_exception
          add            %sp, PTREGS_OFF, %o0
 
         b,pt            %xcc, rtrap
          nop                                            ! yes, the nop is correct
 spill_fixup_dax:
+        TRAP_LOAD_THREAD_REG
         ldx             [%g6 + TI_FLAGS], %g1
         andcc           %g1, _TIF_32BIT, %g0
         ldub            [%g6 + TI_WSAVED], %g1