[Xen-devel] [PATCH v3 09/62] arm/acpi: Add basic ACPI initialization
Stefano Stabellini
stefano.stabellini at eu.citrix.com
Mon Nov 23 03:52:07 PST 2015
On Tue, 17 Nov 2015, shannon.zhao at linaro.org wrote:
> From: Parth Dixit <parth.dixit at linaro.org>
>
> acpi_boot_table_init() will be called in start_xen to get the RSDP and
> all the table pointers. With this patch, we can get ACPI boot-time
> tables from firmware on ARM64.
The patch looks good, only one comment below.
> Signed-off-by: Naresh Bhat <naresh.bhat at linaro.org>
> Signed-off-by: Parth Dixit <parth.dixit at linaro.org>
> Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
> ---
> xen/arch/arm/acpi/Makefile | 1 +
> xen/arch/arm/acpi/boot.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++
> xen/arch/arm/setup.c | 4 +++
> 3 files changed, 67 insertions(+)
> create mode 100644 xen/arch/arm/acpi/boot.c
>
> diff --git a/xen/arch/arm/acpi/Makefile b/xen/arch/arm/acpi/Makefile
> index b5be22d..196c40a 100644
> --- a/xen/arch/arm/acpi/Makefile
> +++ b/xen/arch/arm/acpi/Makefile
> @@ -1 +1,2 @@
> obj-y += lib.o
> +obj-y += boot.o
> diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
> new file mode 100644
> index 0000000..ad51afc
> --- /dev/null
> +++ b/xen/arch/arm/acpi/boot.c
> @@ -0,0 +1,62 @@
> +/*
> + * ARM Specific Low-Level ACPI Boot Support
> + *
> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh at intel.com>
> + * Copyright (C) 2001 Jun Nakajima <jun.nakajima at intel.com>
> + * Copyright (C) 2014, Naresh Bhat <naresh.bhat at linaro.org>
> + * Copyright (C) 2015, Shannon Zhao <shannon.zhao at linaro.org>
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + */
> +
> +#include <xen/init.h>
> +#include <xen/acpi.h>
> +
> +#include <asm/acpi.h>
> +
> +/*
> + * acpi_boot_table_init() called from setup_arch(), always.
> + * 1. find RSDP and get its address, and then find XSDT
> + * 2. extract all tables and checksums them all
> + *
> + * return value: (currently ignored)
> + * 0: success
> + * !0: failure
> + *
> + * We can parse ACPI boot-time tables such as FADT, MADT after
> + * this function is called.
> + */
> +int __init acpi_boot_table_init(void)
> +{
> + int error;
> +
> + /* If acpi_disabled, bail out */
> + if ( acpi_disabled )
> + return 1;
> +
> + /* Initialize the ACPI boot-time table parser. */
> + error = acpi_table_init();
> + if ( error )
> + {
> + disable_acpi();
> + return error;
> + }
> +
> + return 0;
> +}
> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> index 3b29904..768312f 100644
> --- a/xen/arch/arm/setup.c
> +++ b/xen/arch/arm/setup.c
> @@ -36,6 +36,7 @@
> #include <xen/pfn.h>
> #include <xen/vmap.h>
> #include <xen/libfdt/libfdt.h>
> +#include <xen/acpi.h>
> #include <asm/page.h>
> #include <asm/current.h>
> #include <asm/setup.h>
> @@ -753,6 +754,9 @@ void __init start_xen(unsigned long boot_phys_offset,
>
> setup_mm(fdt_paddr, fdt_size);
>
> + /* Parse the ACPI tables for possible boot-time configuration */
> + acpi_boot_table_init();
Are you sure that you need to call acpi_boot_table_init before vm_init?
> vm_init();
> dt_unflatten_host_device_tree();
>
> --
> 2.1.0
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel at lists.xen.org
> http://lists.xen.org/xen-devel
>
More information about the linux-arm-kernel
mailing list