1 files changed, 26 insertions, 35 deletions

diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 4c942f71184d..b49dcd4504b0 100644
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -28,19 +28,14 @@
 #include <asm/mmu.h>
         
 /* This section from from _start to sparc64_boot_end should fit into
- * 0x0000.0000.0040.4000 to 0x0000.0000.0040.8000 and will be sharing space
- * with bootup_user_stack, which is from 0x0000.0000.0040.4000 to
- * 0x0000.0000.0040.6000 and empty_bad_page, which is from
- * 0x0000.0000.0040.6000 to 0x0000.0000.0040.8000. 
+ * 0x0000000000404000 to 0x0000000000408000.
  */
-
         .text
         .globl  start, _start, stext, _stext
 _start:
 start:
 _stext:
 stext:
-bootup_user_stack:
 ! 0x0000000000404000
         b       sparc64_boot
          flushw                                 /* Flush register file.      */
@@ -392,31 +387,30 @@ tlb_fixup_done:
          * former does use this code, the latter does not yet due
          * to some complexities.  That should be fixed up at some
          * point.
+         *
+         * There used to be enormous complexity wrt. transferring
+         * over from the firwmare's trap table to the Linux kernel's.
+         * For example, there was a chicken & egg problem wrt. building
+         * the OBP page tables, yet needing to be on the Linux kernel
+         * trap table (to translate PAGE_OFFSET addresses) in order to
+         * do that.
+         *
+         * We now handle OBP tlb misses differently, via linear lookups
+         * into the prom_trans[] array.  So that specific problem no
+         * longer exists.  Yet, unfortunately there are still some issues
+         * preventing trampoline.S from using this code... ho hum.
          */
         .globl  setup_trap_table
 setup_trap_table:
         save    %sp, -192, %sp
 
-        /* Force interrupts to be disabled.  Transferring over to
-         * the Linux trap table is a very delicate operation.
-         * Until we are actually on the Linux trap table, we cannot
-         * get the PAGE_OFFSET linear mappings translated.  We need
-         * that mapping to be setup in order to initialize the firmware
-         * page tables.
-         *
-         * So there is this window of time, from the return from
-         * prom_set_trap_table() until inherit_prom_mappings_post()
-         * (in arch/sparc64/mm/init.c) completes, during which no
-         * firmware address space accesses can be made.
-         */
+        /* Force interrupts to be disabled. */
         rdpr    %pstate, %o1
         andn    %o1, PSTATE_IE, %o1
         wrpr    %o1, 0x0, %pstate
         wrpr    %g0, 15, %pil
 
-        /* Ok, now make the final valid firmware call to jump over
-         * to the Linux trap table.
-         */
+        /* Make the firmware call to jump over to the Linux trap table.  */
         call    prom_set_trap_table
          sethi  %hi(sparc64_ttable_tl0), %o0
 
@@ -540,15 +534,21 @@ setup_tba:	/* i0 = is_starfire */
 
         ret
          restore
+sparc64_boot_end:
+
+#include "systbls.S"
+#include "ktlb.S"
+#include "etrap.S"
+#include "rtrap.S"
+#include "winfixup.S"
+#include "entry.S"
 
 /*
- * The following skips make sure the trap table in ttable.S is aligned
+ * The following skip makes sure the trap table in ttable.S is aligned
  * on a 32K boundary as required by the v9 specs for TBA register.
  */
-sparc64_boot_end:
-        .skip   0x2000 + _start - sparc64_boot_end
-bootup_user_stack_end:
-        .skip   0x2000
+1:
+        .skip   0x4000 + _start - 1b
 
 #ifdef CONFIG_SBUS
 /* This is just a hack to fool make depend config.h discovering
@@ -560,15 +560,6 @@ bootup_user_stack_end:
 ! 0x0000000000408000
 
 #include "ttable.S"
-#include "systbls.S"
-#include "ktlb.S"
-#include "etrap.S"
-#include "rtrap.S"
-#include "winfixup.S"
-#include "entry.S"
-
-        /* This is just anal retentiveness on my part... */
-        .align  16384
 
         .data
         .align  8