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 * https://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git 36 */ 37 38 #include "qemu/osdep.h" 39 #include "hw/hw.h" 40 #include "hw/qdev.h" 41 #include "qemu/module.h" 42 #include "hw/isa/isa.h" 43 44 #define IOMEM_LEN 0x10000 45 46 typedef struct PCTestdev { 47 ISADevice parent_obj; 48 49 MemoryRegion ioport; 50 MemoryRegion ioport_byte; 51 MemoryRegion flush; 52 MemoryRegion irq; 53 MemoryRegion iomem; 54 uint32_t ioport_data; 55 char iomem_buf[IOMEM_LEN]; 56 } PCTestdev; 57 58 #define TYPE_TESTDEV "pc-testdev" 59 #define TESTDEV(obj) \ 60 OBJECT_CHECK(PCTestdev, (obj), TYPE_TESTDEV) 61 62 static uint64_t test_irq_line_read(void *opaque, hwaddr addr, unsigned size) 63 { 64 return 0; 65 } 66 67 static void test_irq_line_write(void *opaque, hwaddr addr, uint64_t data, 68 unsigned len) 69 { 70 PCTestdev *dev = opaque; 71 ISADevice *isa = ISA_DEVICE(dev); 72 73 qemu_set_irq(isa_get_irq(isa, addr), !!data); 74 } 75 76 static const MemoryRegionOps test_irq_ops = { 77 .read = test_irq_line_read, 78 .write = test_irq_line_write, 79 .valid.min_access_size = 1, 80 .valid.max_access_size = 1, 81 .endianness = DEVICE_LITTLE_ENDIAN, 82 }; 83 84 static void test_ioport_write(void *opaque, hwaddr addr, uint64_t data, 85 unsigned len) 86 { 87 PCTestdev *dev = opaque; 88 int bits = len * 8; 89 int start_bit = (addr & 3) * 8; 90 uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit; 91 dev->ioport_data &= ~mask; 92 dev->ioport_data |= data << start_bit; 93 } 94 95 static uint64_t test_ioport_read(void *opaque, hwaddr addr, unsigned len) 96 { 97 PCTestdev *dev = opaque; 98 int bits = len * 8; 99 int start_bit = (addr & 3) * 8; 100 uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit; 101 return (dev->ioport_data & mask) >> start_bit; 102 } 103 104 static const MemoryRegionOps test_ioport_ops = { 105 .read = test_ioport_read, 106 .write = test_ioport_write, 107 .endianness = DEVICE_LITTLE_ENDIAN, 108 }; 109 110 static const MemoryRegionOps test_ioport_byte_ops = { 111 .read = test_ioport_read, 112 .write = test_ioport_write, 113 .valid.min_access_size = 1, 114 .valid.max_access_size = 4, 115 .impl.min_access_size = 1, 116 .impl.max_access_size = 1, 117 .endianness = DEVICE_LITTLE_ENDIAN, 118 }; 119 120 static uint64_t test_flush_page_read(void *opaque, hwaddr addr, unsigned size) 121 { 122 return 0; 123 } 124 125 static void test_flush_page_write(void *opaque, hwaddr addr, uint64_t data, 126 unsigned len) 127 { 128 hwaddr page = 4096; 129 void *a = cpu_physical_memory_map(data & ~0xffful, &page, 0); 130 131 /* We might not be able to get the full page, only mprotect what we actually 132 have mapped */ 133 #if defined(CONFIG_POSIX) 134 mprotect(a, page, PROT_NONE); 135 mprotect(a, page, PROT_READ|PROT_WRITE); 136 #endif 137 cpu_physical_memory_unmap(a, page, 0, 0); 138 } 139 140 static const MemoryRegionOps test_flush_ops = { 141 .read = test_flush_page_read, 142 .write = test_flush_page_write, 143 .valid.min_access_size = 4, 144 .valid.max_access_size = 4, 145 .endianness = DEVICE_LITTLE_ENDIAN, 146 }; 147 148 static uint64_t test_iomem_read(void *opaque, hwaddr addr, unsigned len) 149 { 150 PCTestdev *dev = opaque; 151 uint64_t ret = 0; 152 memcpy(&ret, &dev->iomem_buf[addr], len); 153 154 return ret; 155 } 156 157 static void test_iomem_write(void *opaque, hwaddr addr, uint64_t val, 158 unsigned len) 159 { 160 PCTestdev *dev = opaque; 161 memcpy(&dev->iomem_buf[addr], &val, len); 162 dev->iomem_buf[addr] = val; 163 } 164 165 static const MemoryRegionOps test_iomem_ops = { 166 .read = test_iomem_read, 167 .write = test_iomem_write, 168 .endianness = DEVICE_LITTLE_ENDIAN, 169 }; 170 171 static void testdev_realizefn(DeviceState *d, Error **errp) 172 { 173 ISADevice *isa = ISA_DEVICE(d); 174 PCTestdev *dev = TESTDEV(d); 175 MemoryRegion *mem = isa_address_space(isa); 176 MemoryRegion *io = isa_address_space_io(isa); 177 178 memory_region_init_io(&dev->ioport, OBJECT(dev), &test_ioport_ops, dev, 179 "pc-testdev-ioport", 4); 180 memory_region_init_io(&dev->ioport_byte, OBJECT(dev), 181 &test_ioport_byte_ops, dev, 182 "pc-testdev-ioport-byte", 4); 183 memory_region_init_io(&dev->flush, OBJECT(dev), &test_flush_ops, dev, 184 "pc-testdev-flush-page", 4); 185 memory_region_init_io(&dev->irq, OBJECT(dev), &test_irq_ops, dev, 186 "pc-testdev-irq-line", 24); 187 memory_region_init_io(&dev->iomem, OBJECT(dev), &test_iomem_ops, dev, 188 "pc-testdev-iomem", IOMEM_LEN); 189 190 memory_region_add_subregion(io, 0xe0, &dev->ioport); 191 memory_region_add_subregion(io, 0xe4, &dev->flush); 192 memory_region_add_subregion(io, 0xe8, &dev->ioport_byte); 193 memory_region_add_subregion(io, 0x2000, &dev->irq); 194 memory_region_add_subregion(mem, 0xff000000, &dev->iomem); 195 } 196 197 static void testdev_class_init(ObjectClass *klass, void *data) 198 { 199 DeviceClass *dc = DEVICE_CLASS(klass); 200 201 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 202 dc->realize = testdev_realizefn; 203 } 204 205 static const TypeInfo testdev_info = { 206 .name = TYPE_TESTDEV, 207 .parent = TYPE_ISA_DEVICE, 208 .instance_size = sizeof(PCTestdev), 209 .class_init = testdev_class_init, 210 }; 211 212 static void testdev_register_types(void) 213 { 214 type_register_static(&testdev_info); 215 } 216 217 type_init(testdev_register_types) 218