[PARISC] Further work for multiple page sizes

More work towards supporing multiple page sizes on 64-bit. Convert
some assumptions that 64bit uses 3 level page tables into testing
PT_NLEVELS. Also some BUG() to BUG_ON() conversions and some cleanups
to assembler.

Signed-off-by: Helge Deller <deller@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 32 insertions, 22 deletions

diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index 6d6436a6b624..94dcc03a28ed 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -6,6 +6,7 @@
  *    Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
  *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
  *    Copyright (C) 2003 James Bottomley <jejb with parisc-linux.org>
+ *    Copyright (C) 2006 Helge Deller <deller@gmx.de>
  *
  *
  *    This program is free software; you can redistribute it and/or modify
@@ -27,6 +28,7 @@
 /* needed for the processor specific cache alignment size */    
 #include <asm/cache.h>
 #include <asm/page.h>
+#include <asm/asm-offsets.h>
         
 /* ld script to make hppa Linux kernel */
 #ifndef CONFIG_64BIT
@@ -68,7 +70,7 @@ SECTIONS
   RODATA
 
   /* writeable */
-  . = ALIGN(4096);              /* Make sure this is page aligned so
+  . = ALIGN(ASM_PAGE_SIZE);     /* Make sure this is page aligned so
                                    that we can properly leave these
                                    as writable */
   data_start = .;
@@ -81,23 +83,17 @@ SECTIONS
   __start___unwind = .;         /* unwind info */
   .PARISC.unwind : { *(.PARISC.unwind) }
   __stop___unwind = .;
- 
+
+  /* rarely changed data like cpu maps */
+  . = ALIGN(16);
+  .data.read_mostly : { *(.data.read_mostly) }
+
+  . = ALIGN(L1_CACHE_BYTES);
   .data : {                     /* Data */
         *(.data)
-        *(.data.vm0.pmd)
-        *(.data.vm0.pgd)
-        *(.data.vm0.pte)
         CONSTRUCTORS
         }
 
-  . = ALIGN(4096);
-  /* nosave data is really only used for software suspend...it's here
-   * just in case we ever implement it */
-  __nosave_begin = .;
-  .data_nosave : { *(.data.nosave) }
-  . = ALIGN(4096);
-  __nosave_end = .;
-
   . = ALIGN(L1_CACHE_BYTES);
   .data.cacheline_aligned : { *(.data.cacheline_aligned) }
 
@@ -105,12 +101,29 @@ SECTIONS
   . = ALIGN(16);
   .data.lock_aligned : { *(.data.lock_aligned) }
 
-  /* rarely changed data like cpu maps */
-  . = ALIGN(16);
-  .data.read_mostly : { *(.data.read_mostly) }
+  . = ALIGN(ASM_PAGE_SIZE);
+  /* nosave data is really only used for software suspend...it's here
+   * just in case we ever implement it */
+  __nosave_begin = .;
+  .data_nosave : { *(.data.nosave) }
+  . = ALIGN(ASM_PAGE_SIZE);
+  __nosave_end = .;
 
   _edata = .;                   /* End of data section */
 
+  __bss_start = .;              /* BSS */
+  /* page table entries need to be PAGE_SIZE aligned */
+  . = ALIGN(ASM_PAGE_SIZE);
+  .data.vmpages : {
+        *(.data.vm0.pmd)
+        *(.data.vm0.pgd)
+        *(.data.vm0.pte)
+        }
+  .bss : { *(.bss) *(COMMON) }
+  __bss_stop = .;
+
+
+  /* assembler code expects init_task to be 16k aligned */
   . = ALIGN(16384);             /* init_task */
   .data.init_task : { *(.data.init_task) }
 
@@ -126,6 +139,7 @@ SECTIONS
   .dlt : { *(.dlt) }
 #endif
 
+  /* reserve space for interrupt stack by aligning __init* to 16k */
   . = ALIGN(16384);
   __init_begin = .;
   .init.text : { 
@@ -166,7 +180,7 @@ SECTIONS
      from .altinstructions and .eh_frame */
   .exit.text : { *(.exit.text) }
   .exit.data : { *(.exit.data) }
-  . = ALIGN(4096);
+  . = ALIGN(ASM_PAGE_SIZE);
   __initramfs_start = .;
   .init.ramfs : { *(.init.ramfs) }
   __initramfs_end = .;
@@ -174,14 +188,10 @@ SECTIONS
   __per_cpu_start = .;
   .data.percpu  : { *(.data.percpu) }
   __per_cpu_end = .;
-  . = ALIGN(4096);
+  . = ALIGN(ASM_PAGE_SIZE);
   __init_end = .;
   /* freed after init ends here */
         
-  __bss_start = .;              /* BSS */
-  .bss : { *(.bss) *(COMMON) }
-  __bss_stop = .; 
-
   _end = . ;
 
   /* Sections to be discarded */