From: Arnd Bergmann <arnd@arndb.de>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>,
Nicolas Pitre <nico@fluxnic.net>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation
Date: Mon, 10 Sep 2012 13:53:34 +0000 [thread overview]
Message-ID: <201209101353.34325.arnd@arndb.de> (raw)
In-Reply-To: <20120910125137.GC27042@arm.com>
On Monday 10 September 2012, Catalin Marinas wrote:
> On Mon, Sep 10, 2012 at 06:53:39AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On 19:29 Sun 09 Sep , Nicolas Pitre wrote:
> > > On Sun, 9 Sep 2012, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > On 17:26 Fri 07 Sep , Catalin Marinas wrote:
> > > > > +The image must be placed at the specified offset (currently 0x80000)
> > > > > +from the start of the system RAM and called there. The start of the
> > > > > +system RAM must be aligned to 2MB.
> > > > can we drop this
> > >
> > > Drop what?
> > > And why?
> > This contrain the must be loadable at any address
>
> You can't easily load the kernel image at any address, unless it can
> relocate itself and you have a way to specify PHYS_OFFSET. We don't want
> a compile-time PHYS_OFFSET, the kernel detects it at boot time based on
> the load address.
I think a bunch of other architectures can have relocatable kernels, which
is useful e.g. for kdump. It does imply a small runtime cost and may have
other disadvantages though.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 02/31] arm64: Kernel booting and initialisation
Date: Mon, 10 Sep 2012 13:53:34 +0000 [thread overview]
Message-ID: <201209101353.34325.arnd@arndb.de> (raw)
In-Reply-To: <20120910125137.GC27042@arm.com>
On Monday 10 September 2012, Catalin Marinas wrote:
> On Mon, Sep 10, 2012 at 06:53:39AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > On 19:29 Sun 09 Sep , Nicolas Pitre wrote:
> > > On Sun, 9 Sep 2012, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > On 17:26 Fri 07 Sep , Catalin Marinas wrote:
> > > > > +The image must be placed at the specified offset (currently 0x80000)
> > > > > +from the start of the system RAM and called there. The start of the
> > > > > +system RAM must be aligned to 2MB.
> > > > can we drop this
> > >
> > > Drop what?
> > > And why?
> > This contrain the must be loadable at any address
>
> You can't easily load the kernel image at any address, unless it can
> relocate itself and you have a way to specify PHYS_OFFSET. We don't want
> a compile-time PHYS_OFFSET, the kernel detects it at boot time based on
> the load address.
I think a bunch of other architectures can have relocatable kernels, which
is useful e.g. for kdump. It does imply a small runtime cost and may have
other disadvantages though.
Arnd
next prev parent reply other threads:[~2012-09-10 13:53 UTC|newest]
Thread overview: 232+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-07 16:26 [PATCH v3 00/31] AArch64 Linux kernel port Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 01/31] arm64: Assembly macros and definitions Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 02/31] arm64: Kernel booting and initialisation Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:07 ` Arnd Bergmann
2012-09-07 19:07 ` Arnd Bergmann
2012-09-09 17:20 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-09 17:20 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-09 23:29 ` Nicolas Pitre
2012-09-09 23:29 ` Nicolas Pitre
2012-09-10 5:53 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 5:53 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 12:51 ` Catalin Marinas
2012-09-10 12:51 ` Catalin Marinas
2012-09-10 13:53 ` Arnd Bergmann [this message]
2012-09-10 13:53 ` Arnd Bergmann
2012-09-10 14:12 ` Nicolas Pitre
2012-09-10 14:12 ` Nicolas Pitre
2012-09-10 14:48 ` Arnd Bergmann
2012-09-10 14:48 ` Arnd Bergmann
2012-09-10 14:48 ` Arnd Bergmann
2012-09-10 14:53 ` Catalin Marinas
2012-09-10 14:53 ` Catalin Marinas
2012-09-10 15:00 ` Nicolas Pitre
2012-09-10 15:00 ` Nicolas Pitre
2012-09-10 15:21 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 15:21 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 15:21 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 16:08 ` Catalin Marinas
2012-09-10 16:08 ` Catalin Marinas
2012-09-10 16:29 ` Nicolas Pitre
2012-09-10 16:29 ` Nicolas Pitre
2012-09-10 20:28 ` Jon Masters
2012-09-10 20:28 ` Jon Masters
2012-09-10 16:11 ` Catalin Marinas
2012-09-10 16:11 ` Catalin Marinas
2012-09-12 12:08 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 12:08 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-12 13:49 ` Catalin Marinas
2012-09-12 13:49 ` Catalin Marinas
2012-09-13 15:56 ` Christopher Covington
2012-09-13 15:56 ` Christopher Covington
2012-09-13 17:11 ` Catalin Marinas
2012-09-13 17:11 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 03/31] arm64: Exception handling Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:09 ` Arnd Bergmann
2012-09-07 19:09 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 04/31] arm64: MMU definitions Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:10 ` Arnd Bergmann
2012-09-07 19:10 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 05/31] arm64: MMU initialisation Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:10 ` Arnd Bergmann
2012-09-07 19:10 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 06/31] arm64: MMU fault handling and page table management Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:11 ` Arnd Bergmann
2012-09-07 19:11 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 07/31] arm64: Process management Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:20 ` Arnd Bergmann
2012-09-07 19:20 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 08/31] arm64: CPU support Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:24 ` Arnd Bergmann
2012-09-07 19:24 ` Arnd Bergmann
2012-09-10 16:43 ` Catalin Marinas
2012-09-10 16:43 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 09/31] arm64: Cache maintenance routines Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:28 ` Arnd Bergmann
2012-09-07 19:28 ` Arnd Bergmann
2012-09-10 16:48 ` Catalin Marinas
2012-09-10 16:48 ` Catalin Marinas
2012-09-10 17:29 ` Nicolas Pitre
2012-09-10 17:29 ` Nicolas Pitre
2012-09-14 16:53 ` Catalin Marinas
2012-09-14 16:53 ` Catalin Marinas
2012-09-07 19:35 ` Simon Baatz
2012-09-07 19:35 ` Simon Baatz
2012-09-12 9:29 ` Catalin Marinas
2012-09-12 9:29 ` Catalin Marinas
2012-09-12 21:55 ` Simon Baatz
2012-09-12 21:55 ` Simon Baatz
2012-09-13 12:38 ` Catalin Marinas
2012-09-13 12:38 ` Catalin Marinas
2012-09-13 20:14 ` Simon Baatz
2012-09-13 20:14 ` Simon Baatz
2012-09-07 16:26 ` [PATCH v3 10/31] arm64: TLB maintenance functionality Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:28 ` Arnd Bergmann
2012-09-07 19:28 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 11/31] arm64: IRQ handling Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:37 ` Arnd Bergmann
2012-09-07 19:37 ` Arnd Bergmann
2012-09-12 10:24 ` Catalin Marinas
2012-09-12 10:24 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 12/31] arm64: Atomic operations Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:37 ` Arnd Bergmann
2012-09-07 19:37 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 13/31] arm64: Device specific operations Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 14/31] arm64: DMA mapping API Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:38 ` Arnd Bergmann
2012-09-07 19:38 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 15/31] arm64: SMP support Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:39 ` Arnd Bergmann
2012-09-07 19:39 ` Arnd Bergmann
2015-08-06 0:46 ` Timur Tabi
2015-08-06 9:56 ` Catalin Marinas
2015-08-10 11:00 ` Hanjun Guo
2015-08-10 17:05 ` Timur Tabi
2015-08-21 16:45 ` Timur Tabi
2015-08-24 12:14 ` Hanjun Guo
2015-08-27 22:15 ` Timur Tabi
2012-09-07 16:26 ` [PATCH v3 16/31] arm64: ELF definitions Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:40 ` Arnd Bergmann
2012-09-07 19:40 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 17/31] arm64: System calls handling Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:43 ` Arnd Bergmann
2012-09-07 19:43 ` Arnd Bergmann
2012-09-07 19:54 ` Al Viro
2012-09-07 19:54 ` Al Viro
2012-09-10 9:56 ` Catalin Marinas
2012-09-10 9:56 ` Catalin Marinas
2012-09-10 13:51 ` Arnd Bergmann
2012-09-10 13:51 ` Arnd Bergmann
2012-09-10 14:01 ` Catalin Marinas
2012-09-10 14:01 ` Catalin Marinas
2012-09-10 14:24 ` Arnd Bergmann
2012-09-10 14:24 ` Arnd Bergmann
2012-09-10 15:50 ` Catalin Marinas
2012-09-10 15:50 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 18/31] arm64: VDSO support Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:44 ` Arnd Bergmann
2012-09-07 19:44 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 19/31] arm64: Signal handling support Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 20/31] arm64: User access library functions Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:46 ` Arnd Bergmann
2012-09-07 19:46 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 21/31] arm64: 32-bit (compat) applications support Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:47 ` Arnd Bergmann
2012-09-07 19:47 ` Arnd Bergmann
2012-09-13 9:07 ` Catalin Marinas
2012-09-13 9:07 ` Catalin Marinas
2012-09-13 9:07 ` Catalin Marinas
2012-09-13 11:03 ` Arnd Bergmann
2012-09-13 11:03 ` Arnd Bergmann
2012-09-13 15:50 ` Catalin Marinas
2012-09-13 15:50 ` Catalin Marinas
2012-09-13 15:50 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 22/31] arm64: Floating point and SIMD Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 16:26 ` [PATCH v3 23/31] arm64: Debugging support Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 19:49 ` Arnd Bergmann
2012-09-07 19:49 ` Arnd Bergmann
2012-09-07 16:26 ` [PATCH v3 24/31] arm64: Add support for /proc/sys/debug/exception-trace Catalin Marinas
2012-09-07 16:26 ` Catalin Marinas
2012-09-07 16:27 ` [PATCH v3 25/31] arm64: Performance counters support Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-07 16:27 ` [PATCH v3 26/31] arm64: Miscellaneous library functions Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-07 19:52 ` Arnd Bergmann
2012-09-07 19:52 ` Arnd Bergmann
2012-09-12 21:12 ` Catalin Marinas
2012-09-12 21:12 ` Catalin Marinas
2012-09-12 21:12 ` Catalin Marinas
2012-09-13 10:48 ` Arnd Bergmann
2012-09-13 10:48 ` Arnd Bergmann
2012-09-07 16:27 ` [PATCH v3 27/31] arm64: Loadable modules Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-07 19:52 ` Arnd Bergmann
2012-09-07 19:52 ` Arnd Bergmann
2012-09-07 16:27 ` [PATCH v3 28/31] arm64: Generic timers support Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-07 19:53 ` Arnd Bergmann
2012-09-07 19:53 ` Arnd Bergmann
2012-09-08 8:28 ` Shilimkar, Santosh
2012-09-08 8:28 ` Shilimkar, Santosh
2012-09-08 8:28 ` Shilimkar, Santosh
2012-09-07 16:27 ` [PATCH v3 29/31] arm64: Miscellaneous header files Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-07 19:54 ` Arnd Bergmann
2012-09-07 19:54 ` Arnd Bergmann
2012-09-07 16:27 ` [PATCH v3 30/31] arm64: Build infrastructure Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-07 19:55 ` Arnd Bergmann
2012-09-07 19:55 ` Arnd Bergmann
2012-09-07 16:27 ` [PATCH v3 31/31] arm64: MAINTAINERS update Catalin Marinas
2012-09-07 16:27 ` Catalin Marinas
2012-09-09 16:31 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-09 16:31 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-09 16:31 ` Jean-Christophe PLAGNIOL-VILLARD
2012-09-10 17:57 ` Nicolas Pitre
2012-09-10 17:57 ` Nicolas Pitre
2012-09-10 21:17 ` Russell King - ARM Linux
2012-09-10 21:17 ` Russell King - ARM Linux
2012-09-10 23:31 ` Nicolas Pitre
2012-09-10 23:31 ` Nicolas Pitre
2012-09-10 23:31 ` Nicolas Pitre
2012-09-07 23:25 ` [PATCH v3 00/31] AArch64 Linux kernel port Olof Johansson
2012-09-07 23:25 ` Olof Johansson
2012-09-12 14:54 ` Catalin Marinas
2012-09-12 14:54 ` Catalin Marinas
2012-09-08 9:18 ` Santosh Shilimkar
2012-09-08 9:18 ` Santosh Shilimkar
2012-09-08 13:59 ` Nicolas Pitre
2012-09-08 13:59 ` Nicolas Pitre
2012-09-08 14:42 ` Shilimkar, Santosh
2012-09-08 14:42 ` Shilimkar, Santosh
2012-09-10 17:53 ` Nicolas Pitre
2012-09-10 17:53 ` Nicolas Pitre
2012-09-10 20:22 ` Jon Masters
2012-09-10 20:22 ` Jon Masters
2012-09-12 11:54 ` Arnd Bergmann
2012-09-12 11:54 ` Arnd Bergmann
2012-09-12 11:54 ` Arnd Bergmann
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