Re: [Xen-devel] [PATCH 01/12 v3] xen/arm: vpl011: Move vgic register access functions to vreg.h

[Julien Grall <julien.grall@xxxxxxx>]

Hi Bhupinder,

On 10/05/17 15:24, Bhupinder Thakur wrote:
> These functions are generic in nature and can be reused by other emulation
> code in Xen. One recent example is pl011 emulation, which needs similar
> funictions to read/write the registers.
s/funictions/functions/

[...]

> -static inline void vgic_reg##sz##_clearbits(uint##sz##_t *reg,          \
> -                                            register_t bits,            \
> -                                            const mmio_info_t *info)    \
> -{                                                                       \
> -    unsigned long tmp = *reg;                                           \
> -                                                                        \
> -    vgic_reg_clearbits(&tmp, bits, info->gpa & offmask,                 \
> -                       info->dabt.size);                                \
> -                                                                        \
> -    *reg = tmp;                                                         \
> -}
> -
>  /*
>   * 64 bits registers are only supported on platform with 64-bit long.
>   * This is also allow us to optimize the 32 bit case by using
Can you explain why you didn't move the definition of the helpers below? E.g

/*
 * 64 bits registers are only supported on platform with 64-bit long.
 * This is also allow us to optimize the 32 bit case by using
 * unsigned long rather than uint64_t
 */
#if BITS_PER_LONG == 64
VGIC_REG_HELPERS(64, 0x7);
#endif
VGIC_REG_HELPERS(32, 0x3);

#undef VGIC_REG_HELPERS

Cheers,

--
Julien Grall

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