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2009-06-04 Vladimir Serbinenko <phcoder@gmail.com>

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Allow a compilation without -mcmodel=large

	* kern/efi/mm.c (grub_efi_allocate_pages): don't allocate >4GiB
	when compiled without -mcmodel=large
	(filter_memory_map): remove memory post 4 GiB when compiled 
	without -mcmodel=large
	* configure.ac: fail gracefully and add -DMCMODEL_SMALL=1 to 
	TARGET_CFLAGS when -mcmodel=large isn't supported
This commit is contained in:
phcoder 2009-06-04 20:25:11 +00:00
parent e8df1d4eb3
commit c8600122db
3 changed files with 25 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

15
configure.ac
View file

@ -339,18 +339,23 @@ fi
if test "$target_cpu"-"$platform" = x86_64-efi; then
# Use large model to support 4G memory
AC_CACHE_CHECK([whether option -mcmodel=large works], grub_cv_cc_mcmodel, [
CFLAGS="-m64 -mcmodel=large"
SAVED_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS -m64 -mcmodel=large"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_cc_mcmodel=yes],
[grub_cv_cc_mcmodel=no])
])
if test "x$grub_cv_cc_no_mcmodel" = xno; then
AC_MSG_ERROR([-mcmodel=large not supported, upgrade your gcc])
if test "x$grub_cv_cc_mcmodel" = xno; then
CFLAGS="$SAVED_CFLAGS -m64 -DMCMODEL_SMALL=1"
TARGET_CFLAGS="$TARGET_CFLAGS -DMCMODEL_SMALL=1"
AC_MSG_WARN([-mcmodel=large not supported. You wan't be able to use the memory over 4GiB. Upgrade your gcc])
else
TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=large"
fi
# EFI writes to stack below %rsp, we must not use the red zone
AC_CACHE_CHECK([whether option -mno-red-zone works], grub_cv_cc_no_red_zone, [
CFLAGS="-m64 -mno-red-zone"
CFLAGS="$CFLAGS -m64 -mno-red-zone"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[grub_cv_cc_no_red_zone=yes],
[grub_cv_cc_no_red_zone=no])
@ -359,7 +364,7 @@ if test "$target_cpu"-"$platform" = x86_64-efi; then
AC_MSG_ERROR([-mno-red-zone not supported, upgrade your gcc])
fi
TARGET_CFLAGS="$TARGET_CFLAGS -mcmodel=large -mno-red-zone"
TARGET_CFLAGS="$TARGET_CFLAGS -mno-red-zone"
fi
#