Re: [Xen-devel] [PATCH v4 05/21] arm/acpi: Add basic ACPI initialization

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 23 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> 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.
> 
> Signed-off-by: Naresh Bhat <naresh.bhat@xxxxxxxxxx>
> Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> ---
>  xen/arch/arm/acpi/Makefile |  1 +
>  xen/arch/arm/acpi/boot.c   | 58 
> ++++++++++++++++++++++++++++++++++++++++++++++
>  xen/arch/arm/setup.c       |  4 ++++
>  3 files changed, 63 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..1570f7e
> --- /dev/null
> +++ b/xen/arch/arm/acpi/boot.c
> @@ -0,0 +1,58 @@
> +/*
> + *  ARM Specific Low-Level ACPI Boot Support
> + *
> + *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@xxxxxxxxx>
> + *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@xxxxxxxxx>
> + *  Copyright (C) 2014, Naresh Bhat <naresh.bhat@xxxxxxxxxx>
> + *  Copyright (C) 2015, Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + *
> + *  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;
> +
> +    /* 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 0ba601e..c15a09d 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>
> @@ -749,6 +750,9 @@ 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();

As I asked before, why do you need to call acpi_boot_table_init() before
vm_init?  If you called acpi_boot_table_init() after vm_init(), you
could implement __acpi_map_table with vmap, which would be better.



>      end_boot_allocator();
>  
>      vm_init();
> -- 
> 2.0.4
> 
> 

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