Re: [Qemu-devel] [PATCH v3 07/39] cirrus: simplify vga window mmio access functions

[Anthony Liguori <anthony@codemonkey.ws>]

On 08/04/2011 08:06 AM, Avi Kivity wrote:
> Make use of the memory API's ability to satisfy multi-byte accesses via
> multiple single-byte accesses.
>
> Reviewed-by: Richard Henderson<rth@twiddle.net>
> Signed-off-by: Avi Kivity<avi@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>   hw/cirrus_vga.c |   79 +++++++-----------------------------------------------
>   1 files changed, 11 insertions(+), 68 deletions(-)
>
> diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
> index b8a51b4..92696d9 100644
> --- a/hw/cirrus_vga.c
> +++ b/hw/cirrus_vga.c
> @@ -1955,7 +1955,9 @@ static void cirrus_mem_writeb_mode4and5_16bpp(CirrusVGAState * s,
>    *
>    ***************************************/
>
> -static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
> +static uint64_t cirrus_vga_mem_read(void *opaque,
> +                                    target_phys_addr_t addr,
> +                                    uint32_t size)
>   {
>       CirrusVGAState *s = opaque;
>       unsigned bank_index;
> @@ -1966,8 +1968,6 @@ static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
>   	return vga_mem_readb(s, addr);
>       }
>
> -    addr&= 0x1ffff;
> -
>       if (addr<  0x10000) {
>   	/* XXX handle bitblt */
>   	/* video memory */
> @@ -1999,28 +1999,10 @@ static uint32_t cirrus_vga_mem_readb(void *opaque, target_phys_addr_t addr)
>       return val;
>   }
>
> -static uint32_t cirrus_vga_mem_readw(void *opaque, target_phys_addr_t addr)
> -{
> -    uint32_t v;
> -
> -    v = cirrus_vga_mem_readb(opaque, addr);
> -    v |= cirrus_vga_mem_readb(opaque, addr + 1)<<  8;
> -    return v;
> -}
> -
> -static uint32_t cirrus_vga_mem_readl(void *opaque, target_phys_addr_t addr)
> -{
> -    uint32_t v;
> -
> -    v = cirrus_vga_mem_readb(opaque, addr);
> -    v |= cirrus_vga_mem_readb(opaque, addr + 1)<<  8;
> -    v |= cirrus_vga_mem_readb(opaque, addr + 2)<<  16;
> -    v |= cirrus_vga_mem_readb(opaque, addr + 3)<<  24;
> -    return v;
> -}
> -
> -static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
> -                                  uint32_t mem_value)
> +static void cirrus_vga_mem_write(void *opaque,
> +                                 target_phys_addr_t addr,
> +                                 uint64_t mem_value,
> +                                 uint32_t size)
>   {
>       CirrusVGAState *s = opaque;
>       unsigned bank_index;
> @@ -2032,8 +2014,6 @@ static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
>           return;
>       }
>
> -    addr&= 0x1ffff;
> -
>       if (addr<  0x10000) {
>   	if (s->cirrus_srcptr != s->cirrus_srcptr_end) {
>   	    /* bitblt */
> @@ -2083,51 +2063,14 @@ static void cirrus_vga_mem_writeb(void *opaque, target_phys_addr_t addr,
>       }
>   }
>
> -static void cirrus_vga_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
> -{
> -    cirrus_vga_mem_writeb(opaque, addr, val&  0xff);
> -    cirrus_vga_mem_writeb(opaque, addr + 1, (val>>  8)&  0xff);
> -}
> -
> -static void cirrus_vga_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
> -{
> -    cirrus_vga_mem_writeb(opaque, addr, val&  0xff);
> -    cirrus_vga_mem_writeb(opaque, addr + 1, (val>>  8)&  0xff);
> -    cirrus_vga_mem_writeb(opaque, addr + 2, (val>>  16)&  0xff);
> -    cirrus_vga_mem_writeb(opaque, addr + 3, (val>>  24)&  0xff);
> -}
> -
> -static uint64_t cirrus_vga_mem_read(void *opaque,
> -                                    target_phys_addr_t addr,
> -                                    uint32_t size)
> -{
> -    CirrusVGAState *s = opaque;
> -
> -    switch (size) {
> -    case 1: return cirrus_vga_mem_readb(s, addr);
> -    case 2: return cirrus_vga_mem_readw(s, addr);
> -    case 4: return cirrus_vga_mem_readl(s, addr);
> -    default: abort();
> -    }
> -}
> -
> -static void cirrus_vga_mem_write(void *opaque, target_phys_addr_t addr,
> -                                 uint64_t data, unsigned size)
> -{
> -    CirrusVGAState *s = opaque;
> -
> -    switch (size) {
> -    case 1: return cirrus_vga_mem_writeb(s, addr, data);
> -    case 2: return cirrus_vga_mem_writew(s, addr, data);
> -    case 4: return cirrus_vga_mem_writel(s, addr, data);
> -    default: abort();
> -    }
> -};
> -
>   static const MemoryRegionOps cirrus_vga_mem_ops = {
>       .read = cirrus_vga_mem_read,
>       .write = cirrus_vga_mem_write,
>       .endianness = DEVICE_LITTLE_ENDIAN,
> +    .impl = {
> +        .min_access_size = 1,
> +        .max_access_size = 1,
> +    },
>   };
>
>   /***************************************