linux-kernel - Re: [PATCH v7 02/17] ARM64 / ACPI: Get RSDP and ACPI boot-time tables

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Date:	Thu, 15 Jan 2015 12:45:03 -0600
From:	Mark Langsdorf <mlangsdo@...hat.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>
CC:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, phoenix.liyi@...wei.com,
	Timur Tabi <timur@...eaurora.org>,
	suravee.suthikulpanit@....com, wangyijing@...wei.com,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	Al Stone <al.stone@...aro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH v7 02/17] ARM64 / ACPI: Get RSDP and ACPI boot-time tables

On 01/14/2015 09:04 AM, Hanjun Guo wrote:
> From: Al Stone <al.stone@...aro.org>
>
> As we want to get ACPI tables to parse and then use the information
> for system initialization, we should get the RSDP (Root System
> Description Pointer) first, it then locates Extended Root Description
> Table (XSDT) which contains all the 64-bit physical address that
> pointer to other boot-time tables.
>
> Introduce acpi.c and its related head file in this patch to provide
> fundamental needs of extern variables and functions for ACPI core,
> and then get boot-time tables as needed.
>    - asm/acenv.h for arch specific ACPICA environments and
>      implementation, It is needed unconditionally by ACPI core;
>    - asm/acpi.h for arch specific variables and functions needed by
>      ACPI driver core;
>    - acpi.c for ARM64 related ACPI implementation for ACPI driver
>      core;
>
> acpi_boot_table_init() is introduced to get RSDP and boot-time tables,
> it will be called in setup_arch() before paging_init(), so we should
> use eary_memremap() mechanism here to get the RSDP and all the table
> pointers.
>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Tested-by: Yijing Wang <wangyijing@...wei.com>
> Signed-off-by: Al Stone <al.stone@...aro.org>
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
Tested-by: Mark Langsdorf <mlangsdo@...hat.com>

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