[Xen-devel] [Qemu-devel] [PATCH v7 24/42] hw/isa: Declare device little or big endian

tony.nguyen@bt.com posted 42 patches 6 years, 5 months ago
There is a newer version of this series
[Xen-devel] [Qemu-devel] [PATCH v7 24/42] hw/isa: Declare device little or big endian
Posted by tony.nguyen@bt.com 6 years, 5 months ago
For each device declared with DEVICE_NATIVE_ENDIAN, find the set of
targets from the set of target/hw/*/device.o.

If the set of targets are all little or all big endian, re-declare
the device endianness as DEVICE_LITTLE_ENDIAN or DEVICE_BIG_ENDIAN
respectively.

This *naive* deduction may result in genuinely native endian devices
being incorrectly declared as little or big endian, but should not
introduce regressions for current targets.

These devices should be re-declared as DEVICE_NATIVE_ENDIAN if 1) it
has a new target with an opposite endian or 2) someone informed knows
better =)

Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
---
 hw/isa/vt82c686.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 12c460590..adf65d3 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -108,7 +108,7 @@ static uint64_t superio_ioport_readb(void *opaque, hwaddr addr, unsigned size)
 static const MemoryRegionOps superio_ops = {
     .read = superio_ioport_readb,
     .write = superio_ioport_writeb,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_LITTLE_ENDIAN,
     .impl = {
         .min_access_size = 1,
         .max_access_size = 1,
--
1.8.3.1

?

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Re: [Qemu-devel] [PATCH v7 24/42] hw/isa: Declare device little or big endian
Posted by Philippe Mathieu-Daudé 6 years, 5 months ago
On 8/16/19 9:34 AM, tony.nguyen@bt.com wrote:
> For each device declared with DEVICE_NATIVE_ENDIAN, find the set of
> targets from the set of target/hw/*/device.o.
> 
> If the set of targets are all little or all big endian, re-declare
> the device endianness as DEVICE_LITTLE_ENDIAN or DEVICE_BIG_ENDIAN
> respectively.
> 
> This *naive* deduction may result in genuinely native endian devices
> being incorrectly declared as little or big endian, but should not
> introduce regressions for current targets.
> 
> These devices should be re-declared as DEVICE_NATIVE_ENDIAN if 1) it
> has a new target with an opposite endian or 2) someone informed knows
> better =)
> 
> Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
> ---
>  hw/isa/vt82c686.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
> index 12c460590..adf65d3 100644
> --- a/hw/isa/vt82c686.c
> +++ b/hw/isa/vt82c686.c
> @@ -108,7 +108,7 @@ static uint64_t superio_ioport_readb(void *opaque,
> hwaddr addr, unsigned size)
>  static const MemoryRegionOps superio_ops = {
>      .read = superio_ioport_readb,
>      .write = superio_ioport_writeb,
> -    .endianness = DEVICE_NATIVE_ENDIAN,
> +    .endianness = DEVICE_LITTLE_ENDIAN,

Being ioport, one is probably OK.

>      .impl = {
>          .min_access_size = 1,
>          .max_access_size = 1,
> -- 
> 1.8.3.1
> 
> ​
>