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qemu-usb: support read/write of unused IO ranges

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The XHCI model reserves 0x4000 of IO memory but uses only 0x530.
Implement read (0) and write (nop) for these regions as real hardware
does.

fixes #4902
This commit is contained in:
Sebastian Sumpf 2023-05-16 19:30:56 +02:00 committed by Christian Helmuth
parent f8bcb1999e
commit ccc04a7082
1 changed files with 14 additions and 6 deletions
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20
repos/libports/src/lib/qemu-usb/qemu_emul.cc
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@ -633,18 +633,28 @@ struct Controller : public Qemu::Controller
MemoryRegionOps const *ops;
} mmio_regions [max_numports() + 4 /* number of HC MMIO regions */];
uint64_t _mmio_size;
typedef Genode::Hex Hex;
/*
* The device model does not implement the whole _mmio_size, add read/write
* for the gaps.
*/
static uint64_t _read_unsued(void *, hwaddr, unsigned) { return 0ul; }
static void _write_unsused(void *, hwaddr, uint64_t, unsigned) { }
MemoryRegionOps _ops { _read_unsued, _write_unsused };
Mmio _unused_region { 0, 0, 0, &_ops };
Controller()
{
Genode::memset(mmio_regions, 0, sizeof(mmio_regions));
}
void mmio_add_region(uint64_t size) { _mmio_size = size; }
void mmio_add_region(uint64_t size) { _mmio_size = size; }
void mmio_add_region_io(Genode::addr_t id, uint64_t size, MemoryRegionOps const *ops)
void mmio_add_region_io(Genode::addr_t id, uint64_t size, MemoryRegionOps const *ops)
{
for (Mmio &mmio : mmio_regions) {
if (mmio.id != 0) continue;
@ -664,12 +674,10 @@ struct Controller : public Qemu::Controller
return mmio;
}
Genode::error("could not find MMIO region for offset: ",
Genode::Hex(offset));
throw -1;
return _unused_region;
}
void mmio_add_sub_region(Genode::addr_t id, Genode::off_t offset)
void mmio_add_sub_region(Genode::addr_t id, Genode::off_t offset)
{
for (Mmio &mmio : mmio_regions) {
if (mmio.id != id) continue;