Re: [Qemu-devel] [PATCH v3 05/39] cirrus: simplify mmio BAR 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>
> ---
>   hw/cirrus_vga.c |   78 +++++-------------------------------------------------
>   1 files changed, 8 insertions(+), 70 deletions(-)
>
> diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
> index d1475dd..6e1aa75 100644
> --- a/hw/cirrus_vga.c
> +++ b/hw/cirrus_vga.c
> @@ -2828,12 +2828,11 @@ static void cirrus_vga_ioport_write(void *opaque, uint32_t addr, uint32_t val)
>    *
>    ***************************************/
>
> -static uint32_t cirrus_mmio_readb(void *opaque, target_phys_addr_t addr)
> +static uint64_t cirrus_mmio_read(void *opaque, target_phys_addr_t addr,
> +                                 unsigned size)
>   {
>       CirrusVGAState *s = opaque;
>
> -    addr&= CIRRUS_PNPMMIO_SIZE - 1;
> -
>       if (addr>= 0x100) {
>           return cirrus_mmio_blt_read(s, addr - 0x100);
>       } else {
> @@ -2841,33 +2840,11 @@ static uint32_t cirrus_mmio_readb(void *opaque, target_phys_addr_t addr)
>       }
>   }
>
> -static uint32_t cirrus_mmio_readw(void *opaque, target_phys_addr_t addr)
> -{
> -    uint32_t v;
> -
> -    v = cirrus_mmio_readb(opaque, addr);
> -    v |= cirrus_mmio_readb(opaque, addr + 1)<<  8;
> -    return v;
> -}
> -
> -static uint32_t cirrus_mmio_readl(void *opaque, target_phys_addr_t addr)
> -{
> -    uint32_t v;
> -
> -    v = cirrus_mmio_readb(opaque, addr);
> -    v |= cirrus_mmio_readb(opaque, addr + 1)<<  8;
> -    v |= cirrus_mmio_readb(opaque, addr + 2)<<  16;
> -    v |= cirrus_mmio_readb(opaque, addr + 3)<<  24;
> -    return v;
> -}
> -
> -static void cirrus_mmio_writeb(void *opaque, target_phys_addr_t addr,
> -			       uint32_t val)
> +static void cirrus_mmio_write(void *opaque, target_phys_addr_t addr,
> +                              uint64_t val, unsigned size)
>   {
>       CirrusVGAState *s = opaque;
>
> -    addr&= CIRRUS_PNPMMIO_SIZE - 1;
> -
>       if (addr>= 0x100) {
>   	cirrus_mmio_blt_write(s, addr - 0x100, val);
>       } else {
> @@ -2875,53 +2852,14 @@ static void cirrus_mmio_writeb(void *opaque, target_phys_addr_t addr,
>       }
>   }
>
> -static void cirrus_mmio_writew(void *opaque, target_phys_addr_t addr,
> -			       uint32_t val)
> -{
> -    cirrus_mmio_writeb(opaque, addr, val&  0xff);
> -    cirrus_mmio_writeb(opaque, addr + 1, (val>>  8)&  0xff);
> -}
> -
> -static void cirrus_mmio_writel(void *opaque, target_phys_addr_t addr,
> -			       uint32_t val)
> -{
> -    cirrus_mmio_writeb(opaque, addr, val&  0xff);
> -    cirrus_mmio_writeb(opaque, addr + 1, (val>>  8)&  0xff);
> -    cirrus_mmio_writeb(opaque, addr + 2, (val>>  16)&  0xff);
> -    cirrus_mmio_writeb(opaque, addr + 3, (val>>  24)&  0xff);
> -}
> -
> -
> -static uint64_t cirrus_mmio_read(void *opaque, target_phys_addr_t addr,
> -                                 unsigned size)
> -{
> -    CirrusVGAState *s = opaque;
> -
> -    switch (size) {
> -    case 1: return cirrus_mmio_readb(s, addr);
> -    case 2: return cirrus_mmio_readw(s, addr);
> -    case 4: return cirrus_mmio_readl(s, addr);
> -    default: abort();
> -    }
> -};
> -
> -static void cirrus_mmio_write(void *opaque, target_phys_addr_t addr,
> -                              uint64_t data, unsigned size)
> -{
> -    CirrusVGAState *s = opaque;
> -
> -    switch (size) {
> -    case 1: return cirrus_mmio_writeb(s, addr, data);
> -    case 2: return cirrus_mmio_writew(s, addr, data);
> -    case 4: return cirrus_mmio_writel(s, addr, data);
> -    default: abort();
> -    }
> -};
> -
>   static const MemoryRegionOps cirrus_mmio_io_ops = {
>       .read = cirrus_mmio_read,
>       .write = cirrus_mmio_write,
>       .endianness = DEVICE_LITTLE_ENDIAN,
> +    .impl = {
> +        .min_access_size = 1,
> +        .max_access_size = 1,
> +    },
>   };

old_mmio?

Regards,

Anthony Liguori

>   /* load/save state */