Re: [RFC PATCH 19/35] subarch support for control register accesses

[Zachary Amsden]

Chris Wright wrote:
> +#define read_cr4_safe() ({			      \
> +	unsigned int __dummy;			      \
> +	/* This could fault if %cr4 does not exist */ \
> +	__asm__("1: movl %%cr4, %0		\n"   \
> +		"2:				\n"   \
> +		".section __ex_table,\"a\"	\n"   \
> +		".long 1b,2b			\n"   \
> +		".previous			\n"   \
> +		: "=r" (__dummy): "0" (0));	      \
> +	__dummy;				      \
> +})

I think you'll find trap and emulate quite sufficient for this one.

> +#define stts() write_cr0(8 | read_cr0())
>   

Nit: You shouldn't need to redefine stts() in the subarch.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/