From a90dc34f976cd37da23af526120f2ac480cb131f Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sat, 19 Mar 2016 02:45:52 +0100
Subject: Make kernel mapping start address configurable

and move it to 16MiB by default to free 24bit DMA area

* i386/configfrag.ac (--with-_START_MAP): Add option, default to 0x1000000.
* i386/Makefrag.am (_START_MAP): Set to $(_START_MAP).
(_START): Set to _START_MAP+0xC0000000.
---
 i386/Makefrag.am   | 4 ++--
 i386/configfrag.ac | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/i386/Makefrag.am b/i386/Makefrag.am
index 8b0ef7f0..c61a3f6f 100644
--- a/i386/Makefrag.am
+++ b/i386/Makefrag.am
@@ -225,8 +225,8 @@ EXTRA_DIST += \
 	i386/ldscript
 if PLATFORM_at
 gnumach_LINKFLAGS += \
-	--defsym _START=0xC0100000 \
-	--defsym _START_MAP=0x100000 \
+	--defsym _START_MAP=$(_START_MAP) \
+	--defsym _START=_START_MAP+0xC0000000 \
 	-T '$(srcdir)'/i386/ldscript
 endif
 
diff --git a/i386/configfrag.ac b/i386/configfrag.ac
index 48744b12..3c29bdf9 100644
--- a/i386/configfrag.ac
+++ b/i386/configfrag.ac
@@ -119,6 +119,11 @@ if [ x"$enable_pae" = xyes ]; then]
 [else]
   AM_CONDITIONAL([enable_pae], [false])
 [fi]
+
+AC_ARG_WITH([_START_MAP],
+  AS_HELP_STRING([--with-_START_MAP=0x1000000], [specify kernel mapping start address]),
+  [_START_MAP="$withval"], [_START_MAP=0x1000000])
+AC_SUBST(_START_MAP)
 
 dnl Local Variables:
 dnl mode: autoconf
-- 
cgit v1.2.3