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From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
	linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
	Michal Marek <mmarek@suse.cz>,
	Joseph Cihula <joseph.cihula@intel.com>,
	Shane Wang <shane.wang@intel.com>
Subject: Re: [PATCH 02/23] x86, realmode: realmode.bin infrastructure
Date: Tue, 08 May 2012 12:14:39 -0700	[thread overview]
Message-ID: <4FA9709F.6020700@linux.intel.com> (raw)
In-Reply-To: <20120508185349.GA12013@merkur.ravnborg.org>

On 05/08/2012 11:53 AM, Sam Ravnborg wrote:
+# How to compile the 16-bit code.  Note we always compile for -march=i386,
+# that way we can complain to the user if the CPU is insufficient.
+KBUILD_CFLAGS	:= $(LINUXINCLUDE) -m32 -g -Os -D_SETUP -D__KERNEL__ \
+		   -DDISABLE_BRANCH_PROFILING \
+		   -Wall -Wstrict-prototypes \
+		   -march=i386 -mregparm=3 \
+		   -include $(srctree)/$(src)/../../boot/code16gcc.h \
+		   -fno-strict-aliasing -fomit-frame-pointer \
+		   $(call cc-option, -ffreestanding) \
+		   $(call cc-option, -fno-toplevel-reorder,\
+			$(call cc-option, -fno-unit-at-a-time)) \
+		   $(call cc-option, -fno-stack-protector) \
+		   $(call cc-option, -mpreferred-stack-boundary=2)
+KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__


> 
> How much is needed to avoid this misuse of kernel-internal build rules?
> This was and is an ugly hack.
> 

It is more or less the same as for arch/x86/boot and other things.  If
there are better ways to do it suggestions are very much appreciated.

However, it is a bit of a tricky bit because we need *some* of the bits
of the target compiler configuration and some not (this is the same as
arch/x86/boot etc.)  It is not "pure target" but it's also most
definitely not host.

	-hpa

  reply	other threads:[~2012-05-08 19:15 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-08 18:22 [PATCH 00/23] x86, realmode: new infrastructure for realmode code Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 01/23] x86, realmode: 16-bit real-mode code support for relocs tool Jarkko Sakkinen
2012-05-08 22:13   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 02/23] x86, realmode: realmode.bin infrastructure Jarkko Sakkinen
2012-05-08 18:53   ` Sam Ravnborg
2012-05-08 19:14     ` H. Peter Anvin [this message]
2012-05-08 20:15       ` H. Peter Anvin
2012-05-08 21:11         ` Sam Ravnborg
2012-05-08 21:21           ` H. Peter Anvin
2012-05-08 22:14   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-09 15:49   ` [PATCH 02/23] " H. Peter Anvin
     [not found]     ` <alpine.DEB.2.02.1205092256240.31031@jsakkine-mobl1.(null)>
2012-05-09 20:06       ` H. Peter Anvin
2012-05-08 18:22 ` [PATCH 03/23] x86, realmode: Relocator for realmode code Jarkko Sakkinen
2012-05-08 22:15   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 04/23] x86, realmode: Move reboot_32.S to unified " Jarkko Sakkinen
2012-05-08 22:16   ` [tip:x86/trampoline] x86, realmode: Move reboot_32. S " tip-bot for Jarkko Sakkinen
2012-05-09  7:12   ` [PATCH 04/23] x86, realmode: Move reboot_32.S " Paolo Bonzini
     [not found]     ` <alpine.DEB.2.02.1205091525100.6943@jsakkine-mobl2.(null)>
2012-05-09 13:53       ` H. Peter Anvin
2012-05-09 14:15         ` Paolo Bonzini
2012-05-09 14:18           ` H. Peter Anvin
2012-05-08 18:22 ` [PATCH 05/23] x86, realmode: Move SMP trampoline " Jarkko Sakkinen
2012-05-08 22:17   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 06/23] x86, realmode: Move ACPI wakeup " Jarkko Sakkinen
2012-05-08 22:18   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 07/23] x86, realmode: Set permission for real mode pages Jarkko Sakkinen
2012-05-08 22:19   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 08/23] x86, realmode: Allow absolute pa_* symbols in the realmode code Jarkko Sakkinen
2012-05-08 22:19   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 09/23] x86, realmode: Add .text64 section, make barrier symbols absolute Jarkko Sakkinen
2012-05-08 22:20   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 10/23] x86, realmode: Move bits to the proper sections in trampoline_64.S Jarkko Sakkinen
2012-05-08 22:21   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 11/23] x86, realmode: Align .data section in trampoline_32.S Jarkko Sakkinen
2012-05-08 22:22   ` [tip:x86/trampoline] x86, realmode: Align . data " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 12/23] x86, realmode: Remove indirect jumps in trampoline_64.S Jarkko Sakkinen
2012-05-08 22:23   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 13/23] x86, realmode: Remove indirect jumps in trampoline_32 and wakeup_asm Jarkko Sakkinen
2012-05-08 22:24   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 14/23] x86, realmode: Replace open-coded ljmpw with a macro Jarkko Sakkinen
2012-05-08 22:24   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 15/23] x86, realmode: Move trampoline_*.S early in the link order Jarkko Sakkinen
2012-05-08 22:25   ` [tip:x86/trampoline] x86, realmode: Move trampoline_*. S " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 16/23] x86, realmode: Fix always-zero test in reboot_32.S Jarkko Sakkinen
2012-05-08 22:26   ` [tip:x86/trampoline] " tip-bot for H. Peter Anvin
2012-05-08 18:22 ` [PATCH 17/23] x86, realmode: fix 64-bit wakeup sequence Jarkko Sakkinen
2012-05-08 22:27   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 18/23] x86, realmode: don't copy real_mode_header Jarkko Sakkinen
2012-05-08 22:28   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 19/23] x86, realmode: flattened rm hierachy Jarkko Sakkinen
2012-05-08 22:29   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 20/23] x86, realmode: header for trampoline code Jarkko Sakkinen
2012-05-08 22:29   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 21/23] x86, realmode: move relocs from scripts/ to arch/x86/tools Jarkko Sakkinen
2012-05-08 22:30   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 22/23] x86, realmode: fixes compilation issue in tboot.c Jarkko Sakkinen
2012-05-08 22:31   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-08 18:22 ` [PATCH 23/23] x86, realmode: read cr4 and EFER from kernel for 64-bit trampoline Jarkko Sakkinen
2012-05-08 22:32   ` [tip:x86/trampoline] " tip-bot for Jarkko Sakkinen
2012-05-16 20:37   ` [tip:x86/trampoline] x86, realmode: Mask out EFER. LMA when saving trampoline EFER tip-bot for H. Peter Anvin
  -- strict thread matches above, loose matches on Subject: below --
2012-05-08 18:20 [PATCH 00/23] x86, realmode: new infrastructure for realmode code Jarkko Sakkinen
2012-05-08 18:20 ` [PATCH 02/23] x86, realmode: realmode.bin infrastructure Jarkko Sakkinen

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