xref: /openbmc/qemu/hw/misc/pc-testdev.c (revision c122bca9)
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"
OBJECT_DECLARE_SIMPLE_TYPE(PCTestdev,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 
test_irq_line_write(void * opaque,hwaddr addr,uint64_t data,unsigned len)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 
test_ioport_write(void * opaque,hwaddr addr,uint64_t data,unsigned len)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 
test_ioport_read(void * opaque,hwaddr addr,unsigned len)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 
test_flush_page_read(void * opaque,hwaddr addr,unsigned size)119 static uint64_t test_flush_page_read(void *opaque, hwaddr addr, unsigned size)
120 {
121     return 0;
122 }
123 
test_flush_page_write(void * opaque,hwaddr addr,uint64_t data,unsigned len)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 
test_iomem_read(void * opaque,hwaddr addr,unsigned len)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 
test_iomem_write(void * opaque,hwaddr addr,uint64_t val,unsigned len)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 
testdev_realizefn(DeviceState * d,Error ** errp)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 
testdev_class_init(ObjectClass * klass,void * data)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 
testdev_register_types(void)211 static void testdev_register_types(void)
212 {
213     type_register_static(&testdev_info);
214 }
215 
216 type_init(testdev_register_types)
217