Re: [coLinux-devel] 0.5.4 on old CPU

[Dan A. <da...@gm...>]

On Thu, Feb 26, 2004 at 09:34:21PM +0600, Dmitriy Kazimirow wrote:

> +++ colinux-20040225/src/Makefile       2004-02-25 08:13:22.000000000 +0600
> @@ -81,7 +81,7 @@
>  
>  HOST_API_CFLAGS=-DCO_HOST_API
>  
> -AR=i586-pc-cygwin-ar
> +AR=i686-pc-cygwin-ar
>  
>[snip]
>  
>  ifeq ($(COLINUX_ARCH),i386)
> -CROSS_TARGET=i586-pc-cygwin-
> +CROSS_TARGET=i686-pc-cygwin-
>  else
>  $(error Other Windows architectures not supported yet!)
>  endif
> diff -r -u colinux-20040225.k6/src/colinux/os/winnt/build/Makefile colinux-20040225/src/colinux/os/winnt/build/Makefile
> --- colinux-20040225.k6/src/colinux/os/winnt/build/Makefile     2004-02-26 03:29:09.109092800 +0600
> +++ colinux-20040225/src/colinux/os/winnt/build/Makefile        2004-02-25 05:21:30.000000000 +0600
> @@ -24,7 +24,7 @@
>  
>  CLEAN_FILES += $(BUILD_PATH)/driver.base.tmp
>  $(BUILD_PATH)/driver.base.tmp: $(BUILD_PATH)/driver.o
> -       i586-pc-cygwin-gcc -Wl,--base-file,$@ \
> +       i686-pc-cygwin-gcc -Wl,--base-file,$@ \
>         -Wl,--entry,_DriverEntry@8 \
>         -nostartfiles -nostdlib \
>          -o junk.tmp $^ -lntoskrnl -lhal -lgcc
> @@ -32,12 +32,12 @@

The prefix of the cygwin's tool chain executables denotes about the 
platform of the compiler and not about the code it produces, e.g, you 
can compile an i686 code by passing -march=i686 to i586-pc-cygwin-gcc 
and compile an i586 code by passing -march=i586 to i686-pc-cygwin-gcc.

AFAIK, the default compilation target is i386 unless specified 
otherwise. Both the Windows driver and userspace supplied with the 
binary distribution of coLinux are compiled without any '-march='-style 
parameters meaning that they are compatible with i386.

So, the meaningful part in your patch is the where you replace fx* 
instructions with f*. I plan for future versions of coLinux to detect 
whether fxsave can be used or not and then choose the right passage 
page code.

Another remark is that the vmlinux file distributed with coLinux 
versions up to 0.5.4 was compiled with -march=i386. In 0.5.4, it was 
compiled with -march=i686. This change will be reverted in the next 
versions.

-- 
Dan Aloni
da...@gm...