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"
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
