hw/pc-testdev.c

   1 /*
   2  * QEMU x86 ISA testdev
   3  *
   4  * Copyright (c) 2012 Avi Kivity, Gerd Hoffmann, Marcelo Tosatti
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /*
  26  * This device is used to test KVM features specific to the x86 port, such
  27  * as emulation, power management, interrupt routing, among others. It's meant
  28  * to be used like:
  29  *
  30  * qemu-system-x86_64 -device pc-testdev -serial stdio \
  31  * -device isa-debug-exit,iobase=0xf4,iosize=0x4 \
  32  * -kernel /home/lmr/Code/virt-test.git/kvm/unittests/msr.flat
  33  *
  34  * Where msr.flat is one of the KVM unittests, present on a separate repo,
  35  * git://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
  36 */
  37
  38 #include "config-host.h"
  39 #if defined(CONFIG_POSIX)
  40 #include <sys/mman.h>
  41 #endif
  42 #include "hw/hw.h"
  43 #include "hw/qdev.h"
  44 #include "hw/isa.h"
  45
  46 #define IOMEM_LEN    0x10000
  47
  48 typedef struct PCTestdev {
  49     ISADevice parent_obj;
  50
  51     MemoryRegion ioport;
  52     MemoryRegion flush;
  53     MemoryRegion irq;
  54     MemoryRegion iomem;
  55     uint32_t ioport_data;
  56     char iomem_buf[IOMEM_LEN];
  57 } PCTestdev;
  58
  59 #define TYPE_TESTDEV "pc-testdev"
  60 #define TESTDEV(obj) \
  61      OBJECT_CHECK(PCTestdev, (obj), TYPE_TESTDEV)
  62
  63 static void test_irq_line(void *opaque, hwaddr addr, uint64_t data,
  64                           unsigned len)
  65 {
  66     PCTestdev *dev = opaque;
  67     ISADevice *isa = ISA_DEVICE(dev);
  68
  69     qemu_set_irq(isa_get_irq(isa, addr), !!data);
  70 }
  71
  72 static const MemoryRegionOps test_irq_ops = {
  73     .write = test_irq_line,
  74     .valid.min_access_size = 1,
  75     .valid.max_access_size = 1,
  76     .endianness = DEVICE_LITTLE_ENDIAN,
  77 };
  78
  79 static void test_ioport_write(void *opaque, hwaddr addr, uint64_t data,
  80                               unsigned len)
  81 {
  82     PCTestdev *dev = opaque;
  83     dev->ioport_data = data;
  84 }
  85
  86 static uint64_t test_ioport_read(void *opaque, hwaddr addr, unsigned len)
  87 {
  88     PCTestdev *dev = opaque;
  89     return dev->ioport_data;
  90 }
  91
  92 static const MemoryRegionOps test_ioport_ops = {
  93     .read = test_ioport_read,
  94     .write = test_ioport_write,
  95     .endianness = DEVICE_LITTLE_ENDIAN,
  96 };
  97
  98 static void test_flush_page(void *opaque, hwaddr addr, uint64_t data,
  99                             unsigned len)
 100 {
 101     hwaddr page = 4096;
 102     void *a = cpu_physical_memory_map(data & ~0xffful, &page, 0);
 103
 104     /* We might not be able to get the full page, only mprotect what we actually
 105        have mapped */
 106 #if defined(CONFIG_POSIX)
 107     mprotect(a, page, PROT_NONE);
 108     mprotect(a, page, PROT_READ|PROT_WRITE);
 109 #endif
 110     cpu_physical_memory_unmap(a, page, 0, 0);
 111 }
 112
 113 static const MemoryRegionOps test_flush_ops = {
 114     .write = test_flush_page,
 115     .valid.min_access_size = 4,
 116     .valid.max_access_size = 4,
 117     .endianness = DEVICE_LITTLE_ENDIAN,
 118 };
 119
 120 static uint64_t test_iomem_read(void *opaque, hwaddr addr, unsigned len)
 121 {
 122     PCTestdev *dev = opaque;
 123     uint64_t ret = 0;
 124     memcpy(&ret, &dev->iomem_buf[addr], len);
 125     ret = le64_to_cpu(ret);
 126
 127     return ret;
 128 }
 129
 130 static void test_iomem_write(void *opaque, hwaddr addr, uint64_t val,
 131                              unsigned len)
 132 {
 133     PCTestdev *dev = opaque;
 134     val = cpu_to_le64(val);
 135     memcpy(&dev->iomem_buf[addr], &val, len);
 136     dev->iomem_buf[addr] = val;
 137 }
 138
 139 static const MemoryRegionOps test_iomem_ops = {
 140     .read = test_iomem_read,
 141     .write = test_iomem_write,
 142     .endianness = DEVICE_LITTLE_ENDIAN,
 143 };
 144
 145 static int init_test_device(ISADevice *isa)
 146 {
 147     PCTestdev *dev = TESTDEV(isa);
 148     MemoryRegion *mem = isa_address_space(isa);
 149     MemoryRegion *io = isa_address_space_io(isa);
 150
 151     memory_region_init_io(&dev->ioport, &test_ioport_ops, dev,
 152                           "pc-testdev-ioport", 4);
 153     memory_region_init_io(&dev->flush, &test_flush_ops, dev,
 154                           "pc-testdev-flush-page", 4);
 155     memory_region_init_io(&dev->irq, &test_irq_ops, dev,
 156                           "pc-testdev-irq-line", 24);
 157     memory_region_init_io(&dev->iomem, &test_iomem_ops, dev,
 158                           "pc-testdev-iomem", IOMEM_LEN);
 159
 160     memory_region_add_subregion(io,  0xe0,       &dev->ioport);
 161     memory_region_add_subregion(io,  0xe4,       &dev->flush);
 162     memory_region_add_subregion(io,  0x2000,     &dev->irq);
 163     memory_region_add_subregion(mem, 0xff000000, &dev->iomem);
 164
 165     return 0;
 166 }
 167
 168 static void testdev_class_init(ObjectClass *klass, void *data)
 169 {
 170     ISADeviceClass *k = ISA_DEVICE_CLASS(klass);
 171
 172     k->init = init_test_device;
 173 }
 174
 175 static const TypeInfo testdev_info = {
 176     .name           = TYPE_TESTDEV,
 177     .parent         = TYPE_ISA_DEVICE,
 178     .instance_size  = sizeof(PCTestdev),
 179     .class_init     = testdev_class_init,
 180 };
 181
 182 static void testdev_register_types(void)
 183 {
 184     type_register_static(&testdev_info);
 185 }
 186
 187 type_init(testdev_register_types)