Merge tag 'pull-hex-20221003' of https://github.com/quic/qemu into staging
[qemu.git] / 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 * https://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
36 */
37
38 #include "qemu/osdep.h"
39 #include "qemu/module.h"
40 #include "hw/irq.h"
41 #include "hw/isa/isa.h"
42 #include "qom/object.h"
43
44 #define IOMEM_LEN 0x10000
45
46 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 };
57
58 #define TYPE_TESTDEV "pc-testdev"
59 OBJECT_DECLARE_SIMPLE_TYPE(PCTestdev, TESTDEV)
60
61 static uint64_t test_irq_line_read(void *opaque, hwaddr addr, unsigned size)
62 {
63 return 0;
64 }
65
66 static void test_irq_line_write(void *opaque, hwaddr addr, uint64_t data,
67 unsigned len)
68 {
69 PCTestdev *dev = opaque;
70 ISADevice *isa = ISA_DEVICE(dev);
71
72 qemu_set_irq(isa_get_irq(isa, addr), !!data);
73 }
74
75 static const MemoryRegionOps test_irq_ops = {
76 .read = test_irq_line_read,
77 .write = test_irq_line_write,
78 .valid.min_access_size = 1,
79 .valid.max_access_size = 1,
80 .endianness = DEVICE_LITTLE_ENDIAN,
81 };
82
83 static void test_ioport_write(void *opaque, hwaddr addr, uint64_t data,
84 unsigned len)
85 {
86 PCTestdev *dev = opaque;
87 int bits = len * 8;
88 int start_bit = (addr & 3) * 8;
89 uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit;
90 dev->ioport_data &= ~mask;
91 dev->ioport_data |= data << start_bit;
92 }
93
94 static uint64_t test_ioport_read(void *opaque, hwaddr addr, unsigned len)
95 {
96 PCTestdev *dev = opaque;
97 int bits = len * 8;
98 int start_bit = (addr & 3) * 8;
99 uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit;
100 return (dev->ioport_data & mask) >> start_bit;
101 }
102
103 static const MemoryRegionOps test_ioport_ops = {
104 .read = test_ioport_read,
105 .write = test_ioport_write,
106 .endianness = DEVICE_LITTLE_ENDIAN,
107 };
108
109 static const MemoryRegionOps test_ioport_byte_ops = {
110 .read = test_ioport_read,
111 .write = test_ioport_write,
112 .valid.min_access_size = 1,
113 .valid.max_access_size = 4,
114 .impl.min_access_size = 1,
115 .impl.max_access_size = 1,
116 .endianness = DEVICE_LITTLE_ENDIAN,
117 };
118
119 static uint64_t test_flush_page_read(void *opaque, hwaddr addr, unsigned size)
120 {
121 return 0;
122 }
123
124 static void test_flush_page_write(void *opaque, hwaddr addr, uint64_t data,
125 unsigned len)
126 {
127 hwaddr page = 4096;
128 void *a = cpu_physical_memory_map(data & ~0xffful, &page, false);
129
130 /* We might not be able to get the full page, only mprotect what we actually
131 have mapped */
132 #if defined(CONFIG_POSIX)
133 mprotect(a, page, PROT_NONE);
134 mprotect(a, page, PROT_READ|PROT_WRITE);
135 #endif
136 cpu_physical_memory_unmap(a, page, 0, 0);
137 }
138
139 static const MemoryRegionOps test_flush_ops = {
140 .read = test_flush_page_read,
141 .write = test_flush_page_write,
142 .valid.min_access_size = 4,
143 .valid.max_access_size = 4,
144 .endianness = DEVICE_LITTLE_ENDIAN,
145 };
146
147 static uint64_t test_iomem_read(void *opaque, hwaddr addr, unsigned len)
148 {
149 PCTestdev *dev = opaque;
150 uint64_t ret = 0;
151 memcpy(&ret, &dev->iomem_buf[addr], len);
152
153 return ret;
154 }
155
156 static void test_iomem_write(void *opaque, hwaddr addr, uint64_t val,
157 unsigned len)
158 {
159 PCTestdev *dev = opaque;
160 memcpy(&dev->iomem_buf[addr], &val, len);
161 dev->iomem_buf[addr] = val;
162 }
163
164 static const MemoryRegionOps test_iomem_ops = {
165 .read = test_iomem_read,
166 .write = test_iomem_write,
167 .endianness = DEVICE_LITTLE_ENDIAN,
168 };
169
170 static void testdev_realizefn(DeviceState *d, Error **errp)
171 {
172 ISADevice *isa = ISA_DEVICE(d);
173 PCTestdev *dev = TESTDEV(d);
174 MemoryRegion *mem = isa_address_space(isa);
175 MemoryRegion *io = isa_address_space_io(isa);
176
177 memory_region_init_io(&dev->ioport, OBJECT(dev), &test_ioport_ops, dev,
178 "pc-testdev-ioport", 4);
179 memory_region_init_io(&dev->ioport_byte, OBJECT(dev),
180 &test_ioport_byte_ops, dev,
181 "pc-testdev-ioport-byte", 4);
182 memory_region_init_io(&dev->flush, OBJECT(dev), &test_flush_ops, dev,
183 "pc-testdev-flush-page", 4);
184 memory_region_init_io(&dev->irq, OBJECT(dev), &test_irq_ops, dev,
185 "pc-testdev-irq-line", 24);
186 memory_region_init_io(&dev->iomem, OBJECT(dev), &test_iomem_ops, dev,
187 "pc-testdev-iomem", IOMEM_LEN);
188
189 memory_region_add_subregion(io, 0xe0, &dev->ioport);
190 memory_region_add_subregion(io, 0xe4, &dev->flush);
191 memory_region_add_subregion(io, 0xe8, &dev->ioport_byte);
192 memory_region_add_subregion(io, 0x2000, &dev->irq);
193 memory_region_add_subregion(mem, 0xff000000, &dev->iomem);
194 }
195
196 static void testdev_class_init(ObjectClass *klass, void *data)
197 {
198 DeviceClass *dc = DEVICE_CLASS(klass);
199
200 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
201 dc->realize = testdev_realizefn;
202 }
203
204 static const TypeInfo testdev_info = {
205 .name = TYPE_TESTDEV,
206 .parent = TYPE_ISA_DEVICE,
207 .instance_size = sizeof(PCTestdev),
208 .class_init = testdev_class_init,
209 };
210
211 static void testdev_register_types(void)
212 {
213 type_register_static(&testdev_info);
214 }
215
216 type_init(testdev_register_types)