From e959a30a6a5a781606431f3c65e7ed6356940d6e Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Mon, 8 Jul 2013 11:48:03 -0700
Subject: Optimize memory layout.

Minimizing the amount of padding between page-aligned data structures.
---
 init.c     |  3 ++-
 pal.S      |  2 +-
 palcode.ld | 11 ++++++++---
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/init.c b/init.c
index b2c4f5a..324bc91 100644
--- a/init.c
+++ b/init.c
@@ -53,7 +53,8 @@ extern char _end[] __attribute__((visibility("hidden"), nocommon));
 
 struct pcb_struct pcb __attribute__((section(".sbss")));
 
-static unsigned long page_dir[1024] __attribute__((aligned(PAGE_SIZE)));
+static unsigned long page_dir[1024]
+  __attribute__((aligned(PAGE_SIZE), section(".bss.page_dir")));
 
 /* The HWRPB must be aligned because it is exported at INIT_HWRPB.  */
 struct hwrpb_combine hwrpb __attribute__((aligned(PAGE_SIZE)));
diff --git a/pal.S b/pal.S
index 1d579aa..c314bd7 100644
--- a/pal.S
+++ b/pal.S
@@ -1905,7 +1905,7 @@ Sys_EnterConsole:
  * Allocate the initial bootup stack.
  */
 
-	.section .bss
+	.section .bss.stack
 	.align 3
 	.globl	stack
 	.type	stack,@object
diff --git a/palcode.ld b/palcode.ld
index 59efb04..b525cbd 100644
--- a/palcode.ld
+++ b/palcode.ld
@@ -6,12 +6,17 @@ SECTIONS
   . = 0xfffffc0000000000;
   .text : { *(.text*) }
   .rodata : { *(.rodata*) }
-  .data ALIGN(8192) : { *(.data.hwrpb) *(.data*) }
+  .data ALIGN(8192) : { *(.data*) }
   .got : { *(.got.plt) *(.got) }
   .sdata : { *(.sdata*) }
   .sbss : { *(.sbss) *(.scommon) }
-  .bss : { *(.bss) *(COMMON) }
-  PROVIDE (_end = .);
+  .bss : {
+    *(.bss.page_dir)
+    *(.bss.stack)
+    *(COMMON)
+    *(.bss)
+    PROVIDE (_end = .);
+  }
 
   /* DWARF debug sections.
      Symbols in the DWARF debugging sections are relative to the beginning
-- 
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