From: ebiederm@xmission.com (Eric W. Biederman)
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Horms <horms@verge.net.au>,
vgoyal@in.ibm.com, fastboot@osdl.org,
linux-kernel@vger.kernel.org,
Jan Kratochvil <lace@jankratochvil.net>,
Magnus Damm <magnus.damm@gmail.com>,
Linda Wang <lwang@redhat.com>
Subject: Re: [RFC] ELF Relocatable x86 and x86_64 bzImages
Date: Mon, 07 Aug 2006 23:04:51 -0600 [thread overview]
Message-ID: <m1ac6fakcs.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <44D813D7.3050004@zytor.com> (H. Peter Anvin's message of "Mon, 07 Aug 2006 21:32:23 -0700")
"H. Peter Anvin" <hpa@zytor.com> writes:
> Horms wrote:
>> I also agree that it is non-intitive. But I wonder if a cleaner
>> fix would be to remove CONFIG_PHYSICAL_START all together. Isn't
>> it just a work around for the kernel not being relocatable, or
>> are there uses for it that relocation can't replace?
>>
>
> Yes, booting with the 2^n existing bootloaders.
Which is something we certainly have to be careful with.
> Relocation, as far as I've understood this patch, refers to loaded address, not
> runtime address.
Actually it refers to both.
Basically we detect if we were loaded with a clueless bootloader,
aka at 1MB. If so we just load to whatever address the code was built
to run at. Otherwise the code stays put.
To be loaded and run at a different address is what is needed for the
crash dump scenario. Where we have to run at some reserved area
of physical memory that the original kernel did not run from.
Eric
next prev parent reply other threads:[~2006-08-08 5:06 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 10:58 [RFC] ELF Relocatable x86 and x86_64 bzImages Eric W. Biederman
2006-08-01 11:03 ` [PATCH 1/33] i386: vmlinux.lds.S Distinguish absolute symbols Eric W. Biederman
2006-08-01 19:06 ` Sam Ravnborg
2006-08-01 11:03 ` [PATCH 2/33] i386: define __pa_symbol Eric W. Biederman
2006-08-01 19:06 ` Andi Kleen
2006-08-02 2:19 ` Eric W. Biederman
2006-08-02 3:04 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 3/33] i386 setup.c: Reserve kernel memory starting from _text Eric W. Biederman
2006-08-01 11:03 ` [PATCH 4/33] i386: CONFIG_PHYSICAL_START cleanup Eric W. Biederman
2006-08-01 19:08 ` Sam Ravnborg
2006-08-02 2:23 ` Eric W. Biederman
2006-08-02 16:14 ` Eric W. Biederman
2006-08-03 14:05 ` Sam Ravnborg
2006-08-01 11:03 ` [PATCH 5/33] i386 Kconfig: Add a range definition to config PHYSICAL_START Eric W. Biederman
2006-08-01 11:03 ` [PATCH 6/33] Make linux/elf.h safe to be included in assembly files Eric W. Biederman
2006-08-01 11:03 ` [PATCH 7/33] elf: Add ELFOSABI_STANDALONE to elf.h Eric W. Biederman
2006-08-01 11:03 ` [PATCH 8/33] kallsyms.c: Generate relocatable symbols Eric W. Biederman
2006-08-01 11:36 ` Paulo Marques
2006-08-01 11:52 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 9/33] i386 boot: Add serial output support to the decompressor Eric W. Biederman
2006-08-01 19:19 ` Andi Kleen
2006-08-02 2:30 ` Eric W. Biederman
2006-08-02 3:07 ` Andi Kleen
2006-08-02 4:57 ` Eric W. Biederman
2006-08-02 5:21 ` Andi Kleen
2006-08-02 6:44 ` Eric W. Biederman
2006-08-02 3:06 ` Eric W. Biederman
2006-08-02 3:10 ` Andi Kleen
2006-08-02 5:27 ` Eric W. Biederman
2006-08-02 5:44 ` Andi Kleen
2006-08-02 7:14 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 10/33] i386: Relocatable kernel support Eric W. Biederman
2006-08-01 13:34 ` Mika Penttilä
2006-08-01 18:07 ` Eric W. Biederman
2006-08-01 18:11 ` Sam Ravnborg
2006-08-01 18:16 ` Mika Penttilä
2006-08-01 11:03 ` [PATCH 11/33] i386 boot: Add an ELF header to bzImage Eric W. Biederman
2006-08-01 22:10 ` Jeremy Fitzhardinge
2006-08-02 2:38 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 12/33] x86_64: fixup indentation in e820.c Eric W. Biederman
2006-08-01 11:03 ` [PATCH 13/33] x86_64: Remove assumptions about the kernel start address from e820/bad_addr() Eric W. Biederman
2006-08-01 11:03 ` [PATCH 14/33] x86_64: Properly report in /proc/iomem the kernel address Eric W. Biederman
2006-08-01 11:03 ` [PATCH 15/33] x86_64: Fix kernel direct mapping size check Eric W. Biederman
2006-08-01 11:03 ` [PATCH 16/33] x86_64: Assembly safe page.h and pgtable.h Eric W. Biederman
2006-08-01 11:03 ` [PATCH 17/33] x86_64: Separate normal memory map initialization from the hotplug case Eric W. Biederman
2006-08-01 11:03 ` [PATCH 18/33] x86_64: Kill temp_boot_pmds Eric W. Biederman
2006-08-01 19:02 ` Andi Kleen
2006-08-02 2:08 ` Eric W. Biederman
2006-08-01 19:04 ` [PATCH 18/33] x86_64: Kill temp_boot_pmds II Andi Kleen
2006-08-02 2:11 ` Eric W. Biederman
2006-08-02 3:07 ` Andi Kleen
2006-08-02 5:35 ` Eric W. Biederman
2006-08-01 11:03 ` [PATCH 19/33] x86_64: Cleanup the early boot page table Eric W. Biederman
2006-08-01 11:03 ` [PATCH 20/33] x86_64: fix early_printk to use the standard ISA mapping Eric W. Biederman
2006-08-01 11:03 ` [PATCH 21/33] x86_64: modify copy_bootdata to use virtual addresses Eric W. Biederman
2006-08-01 11:03 ` [PATCH 22/33] x86_64: Fix gdt table size in trampoline.S Eric W. Biederman
2006-08-01 18:59 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 23/33] x86_64: cleanup segments Eric W. Biederman
2006-08-01 11:03 ` [PATCH 24/33] x86_64: Add EFER to the set registers saved by save_processor_state Eric W. Biederman
2006-08-01 11:03 ` [PATCH 25/33] x86_64: 64bit PIC SMP trampoline Eric W. Biederman
2006-08-01 19:13 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 26/33] x86_64: 64bit PIC ACPI wakeup Eric W. Biederman
2006-08-01 19:10 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 27/33] x86_64: Modify discover_ebda to use virtual addresses Eric W. Biederman
2006-08-01 11:03 ` [PATCH 28/33] x86_64: Remove the identity mapping as early as possible Eric W. Biederman
2006-08-01 19:15 ` Andi Kleen
2006-08-01 11:03 ` [PATCH 29/33] x86_64: __pa and __pa_symbol address space separation Eric W. Biederman
2006-08-01 11:03 ` [PATCH 30/33] x86_64: Remove CONFIG_PHYSICAL_START Eric W. Biederman
2006-08-01 11:03 ` [PATCH 31/33] x86_64 boot: Add serial output support to the decompressor Eric W. Biederman
2006-08-01 11:03 ` [PATCH 32/33] x86_64: Relocatable kernel support Eric W. Biederman
2006-08-01 19:11 ` Andi Kleen
2006-08-02 2:25 ` Eric W. Biederman
2006-11-05 6:02 ` Yinghai Lu
2006-11-05 6:52 ` Eric W. Biederman
2006-11-05 7:15 ` Yinghai Lu
2006-08-01 11:03 ` [PATCH 33/33] x86_64: Make bzImage a valid 64bit elf executable Eric W. Biederman
2006-08-01 19:26 ` [RFC] ELF Relocatable x86 and x86_64 bzImages Vivek Goyal
2006-08-01 20:13 ` Jan Kratochvil
2006-08-01 20:25 ` H. Peter Anvin
2006-08-02 2:02 ` Eric W. Biederman
2006-08-01 20:40 ` Vivek Goyal
2006-08-02 2:40 ` Eric W. Biederman
2006-08-02 6:34 ` Magnus Damm
2006-08-02 7:09 ` Eric W. Biederman
2006-08-02 8:34 ` Magnus Damm
2006-08-02 9:59 ` Eric W. Biederman
2006-08-02 18:37 ` [Fastboot] " Don Zickus
2006-08-03 1:00 ` Eric W. Biederman
2006-08-03 4:53 ` H. Peter Anvin
2006-08-04 22:56 ` Vivek Goyal
2006-08-04 23:14 ` Eric W. Biederman
2006-08-04 23:38 ` Dave Jones
2006-08-04 23:47 ` H. Peter Anvin
2006-08-05 8:01 ` Eric W. Biederman
2006-08-08 3:34 ` Horms
2006-08-08 4:32 ` H. Peter Anvin
2006-08-08 4:57 ` Magnus Damm
2006-08-08 5:04 ` Eric W. Biederman [this message]
2006-08-08 6:09 ` Horms
2006-08-08 7:23 ` Eric W. Biederman
2006-08-08 7:58 ` Horms
2006-08-09 14:56 ` D. Hazelton
2006-08-17 18:44 ` Vivek Goyal
2006-08-11 13:11 ` [Fastboot] " Rachita Kothiyal
2006-08-11 13:36 ` Vivek Goyal
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