From: "H. Peter Anvin" <hpa@zytor.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Tejun Heo <tj@kernel.org>, Thomas Renninger <trenn@suse.de>,
Tang Chen <tangchen@cn.fujitsu.com>,
linux-kernel@vger.kernel.org, Jacob Shin <jacob.shin@amd.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
linux-acpi@vger.kernel.org
Subject: Re: [PATCH v2 08/20] x86, ACPI: Find acpi tables in initrd early from head_32.S/head64.c
Date: Thu, 04 Apr 2013 13:25:37 -0700 [thread overview]
Message-ID: <515DE1C1.6080000@zytor.com> (raw)
In-Reply-To: <CAOJsxLG2Qg7vmLWirWK-GOBp65NxogGcAU5guoVphDu2G=BsjA@mail.gmail.com>
On 03/10/2013 03:25 AM, Pekka Enberg wrote:
>
> What is preventing us from making the 64-bit variant also work in flat
> mode to make the code consistent and not hiding the differences under
> the rug? What am I missing here?
>
There is no such thing as "flat mode" in 64-bit mode. We use a #PF
handler to emulate it, but we add the normal kernel offset when doing so.
In the 32-bit case the problem is that the kernel offset is not
available while in linear mode. It *could* be created using segment
bases, but that would break Xen, I'm pretty sure, and possibly some
other too-clever environments.
-hpa
next prev parent reply other threads:[~2013-04-04 20:26 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-10 6:44 [PATCH v2 00/20] x86, ACPI, numa: Parse numa info early Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 01/20] x86: Change get_ramdisk_image() to global Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 02/20] x86, microcode: Use common get_ramdisk_image() Yinghai Lu
2013-04-04 17:48 ` Tejun Heo
2013-04-04 17:59 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 03/20] x86, ACPI, mm: Kill max_low_pfn_mapped Yinghai Lu
2013-03-10 6:44 ` Yinghai Lu
2013-04-04 17:36 ` Tejun Heo
2013-04-04 18:20 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 04/20] x86, ACPI: Increase override tables number limit Yinghai Lu
2013-04-04 17:50 ` Tejun Heo
2013-04-04 18:03 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 05/20] x86, ACPI: Split acpi_initrd_override to find/copy two functions Yinghai Lu
2013-04-04 18:07 ` Tejun Heo
2013-04-04 19:29 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 06/20] x86, ACPI: Store override acpi tables phys addr in cpio files info array Yinghai Lu
2013-04-04 18:27 ` Tejun Heo
2013-04-04 18:30 ` Tejun Heo
2013-04-04 19:40 ` Yinghai Lu
2013-04-04 20:03 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 07/20] x86, ACPI: Make acpi_initrd_override_find work with 32bit flat mode Yinghai Lu
2013-04-04 18:35 ` Tejun Heo
2013-04-04 20:22 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 08/20] x86, ACPI: Find acpi tables in initrd early from head_32.S/head64.c Yinghai Lu
2013-03-10 10:25 ` Pekka Enberg
2013-03-10 16:47 ` Yinghai Lu
2013-03-10 17:42 ` H. Peter Anvin
2013-04-04 20:25 ` H. Peter Anvin [this message]
2013-03-10 6:44 ` [PATCH v2 09/20] x86, mm, numa: Move two functions calling on successful path later Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 10/20] x86, mm, numa: Call numa_meminfo_cover_memory() checking early Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 11/20] x86, mm, numa: Move node_map_pfn alignment() to x86 Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 12/20] x86, mm, numa: Use numa_meminfo to check node_map_pfn alignment Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 13/20] x86, mm, numa: Set memblock nid later Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 14/20] x86, mm, numa: Move node_possible_map setting later Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 15/20] x86, mm, numa: Move emulation handling down Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 16/20] x86, ACPI, numa, ia64: split SLIT handling out Yinghai Lu
2013-03-10 6:44 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 17/20] x86, mm, numa: Add early_initmem_init() stub Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 18/20] x86, mm: Parse numa info early Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 19/20] x86, mm: Make init_mem_mapping be able to be called several times Yinghai Lu
2013-03-11 13:16 ` Konrad Rzeszutek Wilk
2013-03-11 20:28 ` Yinghai Lu
2013-03-10 6:44 ` [PATCH v2 20/20] x86, mm, numa: Put pagetable on local node ram for 64bit Yinghai Lu
2013-03-11 5:49 ` Tang Chen
2013-03-11 6:29 ` Yinghai Lu
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