Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

[pandora-kernel.git] / arch / sparc64 / kernel / head.S

diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 03ffaf8..35feacb 100644 (file)
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -78,11 +78,7 @@ sparc_ramdisk_image64:
 
        /* PROM cif handler code address is in %o4.  */
 sparc64_boot:
-1:     rd      %pc, %g7
-       set     1b, %g1
-       cmp     %g1, %g7
-       be,pn   %xcc, sparc64_boot_after_remap
-        mov    %o4, %l7
+       mov     %o4, %l7
 
        /* We need to remap the kernel.  Use position independant
         * code to remap us to KERNBASE.
@@ -295,7 +291,6 @@ is_sun4v:
 
        add     %sp, (192 + 128), %sp
 
-sparc64_boot_after_remap:
        sethi   %hi(prom_root_compatible), %g1
        or      %g1, %lo(prom_root_compatible), %g1
        sethi   %hi(prom_sun4v_name), %g7
@@ -463,7 +458,6 @@ tlb_fixup_done:
        or      %g6, %lo(init_thread_union), %g6
        ldx     [%g6 + TI_TASK], %g4
        mov     %sp, %l6
-       mov     %o4, %l7
 
        wr      %g0, ASI_P, %asi
        mov     1, %g1
@@ -528,7 +522,7 @@ tlb_fixup_done:
 #else
        mov     0, %o0
 #endif
-       stb     %o0, [%g6 + TI_CPU]
+       sth     %o0, [%g6 + TI_CPU]
 
        /* Off we go.... */
        call    start_kernel
@@ -658,33 +652,54 @@ setup_tba:
         restore
 sparc64_boot_end:
 
-#include "ktlb.S"
-#include "tsb.S"
 #include "etrap.S"
 #include "rtrap.S"
 #include "winfixup.S"
 #include "entry.S"
 #include "sun4v_tlb_miss.S"
 #include "sun4v_ivec.S"
+#include "ktlb.S"
+#include "tsb.S"
 
 /*
  * 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.
  *
  * We align to a 32K boundary, then we have the 32K kernel TSB,
- * then the 32K aligned trap table.
+ * the 64K kernel 4MB TSB, and then the 32K aligned trap table.
  */
 1:
        .skip   0x4000 + _start - 1b
 
+! 0x0000000000408000
+
        .globl  swapper_tsb
 swapper_tsb:
        .skip   (32 * 1024)
 
-! 0x0000000000408000
+       .globl  swapper_4m_tsb
+swapper_4m_tsb:
+       .skip   (64 * 1024)
+
+! 0x0000000000420000
 
+       /* Some care needs to be exercised if you try to move the
+        * location of the trap table relative to other things.  For
+        * one thing there are br* instructions in some of the
+        * trap table entires which branch back to code in ktlb.S
+        * Those instructions can only handle a signed 16-bit
+        * displacement.
+        *
+        * There is a binutils bug (bugzilla #4558) which causes
+        * the relocation overflow checks for such instructions to
+        * not be done correctly.  So bintuils will not notice the
+        * error and will instead write junk into the relocation and
+        * you'll have an unbootable kernel.
+        */
 #include "ttable.S"
 
+! 0x0000000000428000
+
 #include "systbls.S"
 
        .data