On Tue, Nov 05, 2024 at 02:04:21PM +0100, Philippe Mathieu-Daudé wrote: > Per the datasheet (reference added in file header, p.9) > 'Programming Model' -> 'Register Data Types and Organization': > > "The XPS INTC registers are read as big-endian data" Hi Phil, Some of these devices exist in both big and little endian versions. So far we've reused the same model by using DEVICE_NATIVE_ENDIAN. Here's the little endian version: https://docs.amd.com/v/u/en-US/ds747_axi_intc Can we have add property to select the endianess? For the Xilinx use-cases I think it may be a good idea to default it to little endian and have the big-endian machines explicitly set it. Cheers, Edgar > > Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> > --- > hw/intc/xilinx_intc.c | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/hw/intc/xilinx_intc.c b/hw/intc/xilinx_intc.c > index 1762b34564e..71f743a1f14 100644 > --- a/hw/intc/xilinx_intc.c > +++ b/hw/intc/xilinx_intc.c > @@ -3,6 +3,9 @@ > * > * Copyright (c) 2009 Edgar E. Iglesias. > * > + * https://docs.amd.com/v/u/en-US/xps_intc > + * DS572: LogiCORE IP XPS Interrupt Controller (v2.01a) > + * > * Permission is hereby granted, free of charge, to any person obtaining a copy > * of this software and associated documentation files (the "Software"), to deal > * in the Software without restriction, including without limitation the rights > @@ -143,12 +146,20 @@ static void pic_write(void *opaque, hwaddr addr, > static const MemoryRegionOps pic_ops = { > .read = pic_read, > .write = pic_write, > - .endianness = DEVICE_NATIVE_ENDIAN, > + /* The XPS INTC registers are read as big-endian data. */ > + .endianness = DEVICE_BIG_ENDIAN, > .impl = { > .min_access_size = 4, > .max_access_size = 4, > }, > .valid = { > + /* > + * All XPS INTC registers are accessed through the PLB interface. > + * The base address for these registers is provided by the > + * configuration parameter, C_BASEADDR. Each register is 32 bits > + * although some bits may be unused and is accessed on a 4-byte > + * boundary offset from the base address. > + */ > .min_access_size = 4, > .max_access_size = 4, > }, > -- > 2.45.2 >
