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/*
* QEMU x86 ISA testdev
*
* Copyright (c) 2012 Avi Kivity, Gerd Hoffmann, Marcelo Tosatti
*
* 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* This device is used to test KVM features specific to the x86 port, such
* as emulation, power management, interrupt routing, among others. It's meant
* to be used like:
*
* qemu-system-x86_64 -device pc-testdev -serial stdio \
* -device isa-debug-exit,iobase=0xf4,iosize=0x4 \
* -kernel /home/lmr/Code/virt-test.git/kvm/unittests/msr.flat
*
* Where msr.flat is one of the KVM unittests, present on a separate repo,
* https://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
*/
#include "qemu/osdep.h"
#include "qemu/module.h"
#include "hw/irq.h"
#include "hw/isa/isa.h"
#include "qom/object.h"
#define IOMEM_LEN 0x10000
struct PCTestdev {
ISADevice parent_obj;
MemoryRegion ioport;
MemoryRegion ioport_byte;
MemoryRegion flush;
MemoryRegion irq;
MemoryRegion iomem;
uint32_t ioport_data;
char iomem_buf[IOMEM_LEN];
};
#define TYPE_TESTDEV "pc-testdev"
OBJECT_DECLARE_SIMPLE_TYPE(PCTestdev, TESTDEV)
static uint64_t test_irq_line_read(void *opaque, hwaddr addr, unsigned size)
{
return 0;
}
static void test_irq_line_write(void *opaque, hwaddr addr, uint64_t data,
unsigned len)
{
PCTestdev *dev = opaque;
ISADevice *isa = ISA_DEVICE(dev);
qemu_set_irq(isa_get_irq(isa, addr), !!data);
}
static const MemoryRegionOps test_irq_ops = {
.read = test_irq_line_read,
.write = test_irq_line_write,
.valid.min_access_size = 1,
.valid.max_access_size = 1,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void test_ioport_write(void *opaque, hwaddr addr, uint64_t data,
unsigned len)
{
PCTestdev *dev = opaque;
int bits = len * 8;
int start_bit = (addr & 3) * 8;
uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit;
dev->ioport_data &= ~mask;
dev->ioport_data |= data << start_bit;
}
static uint64_t test_ioport_read(void *opaque, hwaddr addr, unsigned len)
{
PCTestdev *dev = opaque;
int bits = len * 8;
int start_bit = (addr & 3) * 8;
uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit;
return (dev->ioport_data & mask) >> start_bit;
}
static const MemoryRegionOps test_ioport_ops = {
.read = test_ioport_read,
.write = test_ioport_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static const MemoryRegionOps test_ioport_byte_ops = {
.read = test_ioport_read,
.write = test_ioport_write,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
.impl.min_access_size = 1,
.impl.max_access_size = 1,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t test_flush_page_read(void *opaque, hwaddr addr, unsigned size)
{
return 0;
}
static void test_flush_page_write(void *opaque, hwaddr addr, uint64_t data,
unsigned len)
{
hwaddr page = 4096;
void *a = cpu_physical_memory_map(data & ~0xffful, &page, false);
/* We might not be able to get the full page, only mprotect what we actually
have mapped */
#if defined(CONFIG_POSIX)
mprotect(a, page, PROT_NONE);
mprotect(a, page, PROT_READ|PROT_WRITE);
#endif
cpu_physical_memory_unmap(a, page, 0, 0);
}
static const MemoryRegionOps test_flush_ops = {
.read = test_flush_page_read,
.write = test_flush_page_write,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t test_iomem_read(void *opaque, hwaddr addr, unsigned len)
{
PCTestdev *dev = opaque;
uint64_t ret = 0;
memcpy(&ret, &dev->iomem_buf[addr], len);
return ret;
}
static void test_iomem_write(void *opaque, hwaddr addr, uint64_t val,
unsigned len)
{
PCTestdev *dev = opaque;
memcpy(&dev->iomem_buf[addr], &val, len);
dev->iomem_buf[addr] = val;
}
static const MemoryRegionOps test_iomem_ops = {
.read = test_iomem_read,
.write = test_iomem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void testdev_realizefn(DeviceState *d, Error **errp)
{
ISADevice *isa = ISA_DEVICE(d);
PCTestdev *dev = TESTDEV(d);
MemoryRegion *mem = isa_address_space(isa);
MemoryRegion *io = isa_address_space_io(isa);
memory_region_init_io(&dev->ioport, OBJECT(dev), &test_ioport_ops, dev,
"pc-testdev-ioport", 4);
memory_region_init_io(&dev->ioport_byte, OBJECT(dev),
&test_ioport_byte_ops, dev,
"pc-testdev-ioport-byte", 4);
memory_region_init_io(&dev->flush, OBJECT(dev), &test_flush_ops, dev,
"pc-testdev-flush-page", 4);
memory_region_init_io(&dev->irq, OBJECT(dev), &test_irq_ops, dev,
"pc-testdev-irq-line", 24);
memory_region_init_io(&dev->iomem, OBJECT(dev), &test_iomem_ops, dev,
"pc-testdev-iomem", IOMEM_LEN);
memory_region_add_subregion(io, 0xe0, &dev->ioport);
memory_region_add_subregion(io, 0xe4, &dev->flush);
memory_region_add_subregion(io, 0xe8, &dev->ioport_byte);
memory_region_add_subregion(io, 0x2000, &dev->irq);
memory_region_add_subregion(mem, 0xff000000, &dev->iomem);
}
static void testdev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
dc->realize = testdev_realizefn;
}
static const TypeInfo testdev_info = {
.name = TYPE_TESTDEV,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(PCTestdev),
.class_init = testdev_class_init,
};
static void testdev_register_types(void)
{
type_register_static(&testdev_info);
}
type_init(testdev_register_types)
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