hw/misc/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/isa.h"
  45
  46 #define IOMEM_LEN    0x10000
  47
  48 typedef struct PCTestdev {
  49     ISADevice parent_obj;
  50
  51     MemoryRegion ioport;
  52     MemoryRegion ioport_byte;
  53     MemoryRegion flush;
  54     MemoryRegion irq;
  55     MemoryRegion iomem;
  56     uint32_t ioport_data;
  57     char iomem_buf[IOMEM_LEN];
  58 } PCTestdev;
  59
  60 #define TYPE_TESTDEV "pc-testdev"
  61 #define TESTDEV(obj) \
  62      OBJECT_CHECK(PCTestdev, (obj), TYPE_TESTDEV)
  63
  64 static void test_irq_line(void *opaque, hwaddr addr, uint64_t data,
  65                           unsigned len)
  66 {
  67     PCTestdev *dev = opaque;
  68     ISADevice *isa = ISA_DEVICE(dev);
  69
  70     qemu_set_irq(isa_get_irq(isa, addr), !!data);
  71 }
  72
  73 static const MemoryRegionOps test_irq_ops = {
  74     .write = test_irq_line,
  75     .valid.min_access_size = 1,
  76     .valid.max_access_size = 1,
  77     .endianness = DEVICE_LITTLE_ENDIAN,
  78 };
  79
  80 static void test_ioport_write(void *opaque, hwaddr addr, uint64_t data,
  81                               unsigned len)
  82 {
  83     PCTestdev *dev = opaque;
  84     int bits = len * 8;
  85     int start_bit = (addr & 3) * 8;
  86     uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit;
  87     dev->ioport_data &= ~mask;
  88     dev->ioport_data |= data << start_bit;
  89 }
  90
  91 static uint64_t test_ioport_read(void *opaque, hwaddr addr, unsigned len)
  92 {
  93     PCTestdev *dev = opaque;
  94     int bits = len * 8;
  95     int start_bit = (addr & 3) * 8;
  96     uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit;
  97     return (dev->ioport_data & mask) >> start_bit;
  98 }
  99
 100 static const MemoryRegionOps test_ioport_ops = {
 101     .read = test_ioport_read,
 102     .write = test_ioport_write,
 103     .endianness = DEVICE_LITTLE_ENDIAN,
 104 };
 105
 106 static const MemoryRegionOps test_ioport_byte_ops = {
 107     .read = test_ioport_read,
 108     .write = test_ioport_write,
 109     .valid.min_access_size = 1,
 110     .valid.max_access_size = 4,
 111     .impl.min_access_size = 1,
 112     .impl.max_access_size = 1,
 113     .endianness = DEVICE_LITTLE_ENDIAN,
 114 };
 115
 116 static void test_flush_page(void *opaque, hwaddr addr, uint64_t data,
 117                             unsigned len)
 118 {
 119     hwaddr page = 4096;
 120     void *a = cpu_physical_memory_map(data & ~0xffful, &page, 0);
 121
 122     /* We might not be able to get the full page, only mprotect what we actually
 123        have mapped */
 124 #if defined(CONFIG_POSIX)
 125     mprotect(a, page, PROT_NONE);
 126     mprotect(a, page, PROT_READ|PROT_WRITE);
 127 #endif
 128     cpu_physical_memory_unmap(a, page, 0, 0);
 129 }
 130
 131 static const MemoryRegionOps test_flush_ops = {
 132     .write = test_flush_page,
 133     .valid.min_access_size = 4,
 134     .valid.max_access_size = 4,
 135     .endianness = DEVICE_LITTLE_ENDIAN,
 136 };
 137
 138 static uint64_t test_iomem_read(void *opaque, hwaddr addr, unsigned len)
 139 {
 140     PCTestdev *dev = opaque;
 141     uint64_t ret = 0;
 142     memcpy(&ret, &dev->iomem_buf[addr], len);
 143
 144     return ret;
 145 }
 146
 147 static void test_iomem_write(void *opaque, hwaddr addr, uint64_t val,
 148                              unsigned len)
 149 {
 150     PCTestdev *dev = opaque;
 151     memcpy(&dev->iomem_buf[addr], &val, len);
 152     dev->iomem_buf[addr] = val;
 153 }
 154
 155 static const MemoryRegionOps test_iomem_ops = {
 156     .read = test_iomem_read,
 157     .write = test_iomem_write,
 158     .endianness = DEVICE_LITTLE_ENDIAN,
 159 };
 160
 161 static void testdev_realizefn(DeviceState *d, Error **errp)
 162 {
 163     ISADevice *isa = ISA_DEVICE(d);
 164     PCTestdev *dev = TESTDEV(d);
 165     MemoryRegion *mem = isa_address_space(isa);
 166     MemoryRegion *io = isa_address_space_io(isa);
 167
 168     memory_region_init_io(&dev->ioport, OBJECT(dev), &test_ioport_ops, dev,
 169                           "pc-testdev-ioport", 4);
 170     memory_region_init_io(&dev->ioport_byte, OBJECT(dev),
 171                           &test_ioport_byte_ops, dev,
 172                           "pc-testdev-ioport-byte", 4);
 173     memory_region_init_io(&dev->flush, OBJECT(dev), &test_flush_ops, dev,
 174                           "pc-testdev-flush-page", 4);
 175     memory_region_init_io(&dev->irq, OBJECT(dev), &test_irq_ops, dev,
 176                           "pc-testdev-irq-line", 24);
 177     memory_region_init_io(&dev->iomem, OBJECT(dev), &test_iomem_ops, dev,
 178                           "pc-testdev-iomem", IOMEM_LEN);
 179
 180     memory_region_add_subregion(io,  0xe0,       &dev->ioport);
 181     memory_region_add_subregion(io,  0xe4,       &dev->flush);
 182     memory_region_add_subregion(io,  0xe8,       &dev->ioport_byte);
 183     memory_region_add_subregion(io,  0x2000,     &dev->irq);
 184     memory_region_add_subregion(mem, 0xff000000, &dev->iomem);
 185 }
 186
 187 static void testdev_class_init(ObjectClass *klass, void *data)
 188 {
 189     DeviceClass *dc = DEVICE_CLASS(klass);
 190
 191     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 192     dc->realize = testdev_realizefn;
 193 }
 194
 195 static const TypeInfo testdev_info = {
 196     .name           = TYPE_TESTDEV,
 197     .parent         = TYPE_ISA_DEVICE,
 198     .instance_size  = sizeof(PCTestdev),
 199     .class_init     = testdev_class_init,
 200 };
 201
 202 static void testdev_register_types(void)
 203 {
 204     type_register_static(&testdev_info);
 205 }
 206
 207 type_init(testdev_register_types)