Re: [Xen-devel] [PATCH v5 01/22] arm/acpi: Emulate io ports for arm

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 26 Feb 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> Add macros to emulate x86 style ports for arm. This avoids modification in
> common code for acpi. Here just print a warning on ARM.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


> V5: not write to the address, just print warning
> V4: print warning
> ---
>  xen/include/asm-arm/arm64/io.h | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/xen/include/asm-arm/arm64/io.h b/xen/include/asm-arm/arm64/io.h
> index 37abc47..f80156f 100644
> --- a/xen/include/asm-arm/arm64/io.h
> +++ b/xen/include/asm-arm/arm64/io.h
> @@ -20,6 +20,7 @@
>  #ifndef _ARM_ARM64_IO_H
>  #define _ARM_ARM64_IO_H
>  
> +#include <asm/system.h>
>  #include <asm/byteorder.h>
>  
>  /*
> @@ -109,4 +110,26 @@ static inline u64 __raw_readq(const volatile void 
> __iomem *addr)
>  #define writel(v,c)             ({ __iowmb(); writel_relaxed((v),(c)); })
>  #define writeq(v,c)             ({ __iowmb(); writeq_relaxed((v),(c)); })
>  
> +/*
> + * Emulate x86 io ports for ARM.
> + */
> +static inline int emulate_read(u64 addr)
> +{
> +    printk(XENLOG_G_WARNING "Can't access IO %lx\n", addr);
> +    return 0;
> +}
> +
> +static inline void emulate_write(u64 addr)
> +{
> +    printk(XENLOG_G_WARNING "Can't access IO %lx\n", addr);
> +}
> +
> +#define inb(c) ( emulate_read(c) )
> +#define inw(c) ( emulate_read(c) )
> +#define inl(c) ( emulate_read(c) )
> +
> +#define outb(v, c) ( emulate_write(c) )
> +#define outw(v, c) ( emulate_write(c) )
> +#define outl(v, c) ( emulate_write(c) )
> +
>  #endif /* _ARM_ARM64_IO_H */

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