linux-kernel - Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

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Date:	Fri, 23 Mar 2012 18:05:18 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Renninger <trenn@...e.de>
Cc:	eric.piel@...mplin-utc.net, vojcek@...n.pl, dsdt@...gusch.at,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, Lin Ming <ming.m.lin@...el.com>, lenb@...nel.org,
	robert.moore@...el.com, hpa@...or.com
Subject: Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

On Fri, Mar 23, 2012 at 1:54 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Fri, Mar 23, 2012 at 7:29 AM, Thomas Renninger <trenn@...e.de> wrote:
>> Details can be found in:
>> Documentation/acpi/initrd_table_override.txt
>>
>> Additional dmesg output of a booted system with
>> FACP (FADT), DSDT and SSDT (the 9th dynamically loaded one)
>> tables overridden (with ### marked comments):
>>
>> ### ACPI tables found glued to initrd
>> DSDT ACPI table found in initrd - size: 16234
>> FACP ACPI table found in initrd - size: 116
>> SSDT ACPI table found in initrd - size: 334
>> ### Re-printed e820 map via e820_update() with additionally created
>> ### ACPI data section at 0xcff55000 where the ACPI tables passed via
>> ### initrd where copied to
>> modified physical RAM map:
>> ...
>>  ### New ACPI data section:
>>  modified: 00000000cff55000 - 00000000cff5912c (ACPI data)
>>  ### BIOS e820 provided ACPI data section:
>>  modified: 00000000cff60000 - 00000000cff69000 (ACPI data)
>> ...
>> ### Total size of all ACPI tables glued to initrd
>> ### The address is initrd_start which gets updated to
>> ### initrd_start = initrd_start + "size of all ACPI tables glued to initrd"
>> Found acpi tables of size: 16684 at 0xffff8800374c4000
>>
>> Disabling lock debugging due to kernel taint
>> ### initrd provided FACP and DSDT tables are used instead of BIOS provided ones
>> ACPI: FACP @ 0x00000000cff68dd8 Phys table override, replaced with:
>> ACPI: FACP 00000000cff58f6a 00074 (v01 INTEL  TUMWATER 06040000 PTL  00000003)
>> ACPI: DSDT @ 0x00000000cff649d4 Phys table override, replaced with:
>> ACPI: DSDT 00000000cff55000 04404 (v01  Intel BLAKFORD 06040000 MSFT 0100000E)
>> ...
>> ### Much later, the 9th (/sys/firmware/acpi/table/dynamic/SSDT9) dynamically
>> ### loaded ACPI table matches and gets overridden:
>> ACPI: SSDT @ 0x00000000cff64824 Phys table override, replaced with:
>> ACPI: SSDT 00000000cff58fde 0014E (v01  PmRef  Cpu7Ist 00003000 INTL 20110316)
>> ACPI: Dynamic OEM Table Load:
>> ACPI: SSDT           (null) 0014E (v01  PmRef  Cpu7Ist 00003000 INTL 20110316)
>> ...
>>
>> If the initrd does not start with a valid ACPI table signature or the ACPI
>> table's checksum is wrong, there is no functional change.

updated it a little bit to remove 2 #ifdef. please check attached.

Yinghai

View attachment "thomas_renninger_acpi_override.patch" of type "text/x-patch" (17150 bytes)