2 * ARMV7M System emulation.
4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licensed under the GPL.
10 #include "qemu/osdep.h"
11 #include "hw/arm/armv7m.h"
12 #include "qapi/error.h"
13 #include "qemu-common.h"
15 #include "hw/sysbus.h"
16 #include "hw/arm/arm.h"
17 #include "hw/loader.h"
19 #include "sysemu/qtest.h"
20 #include "qemu/error-report.h"
21 #include "exec/address-spaces.h"
23 /* Bitbanded IO. Each word corresponds to a single bit. */
25 /* Get the byte address of the real memory for a bitband access. */
26 static inline hwaddr
bitband_addr(BitBandState
*s
, hwaddr offset
)
28 return s
->base
| (offset
& 0x1ffffff) >> 5;
31 static MemTxResult
bitband_read(void *opaque
, hwaddr offset
,
32 uint64_t *data
, unsigned size
, MemTxAttrs attrs
)
34 BitBandState
*s
= opaque
;
42 /* Find address in underlying memory and round down to multiple of size */
43 addr
= bitband_addr(s
, offset
) & (-size
);
44 res
= address_space_read(&s
->source_as
, addr
, attrs
, buf
, size
);
48 /* Bit position in the N bytes read... */
49 bitpos
= (offset
>> 2) & ((size
* 8) - 1);
50 /* ...converted to byte in buffer and bit in byte */
51 bit
= (buf
[bitpos
>> 3] >> (bitpos
& 7)) & 1;
56 static MemTxResult
bitband_write(void *opaque
, hwaddr offset
, uint64_t value
,
57 unsigned size
, MemTxAttrs attrs
)
59 BitBandState
*s
= opaque
;
67 /* Find address in underlying memory and round down to multiple of size */
68 addr
= bitband_addr(s
, offset
) & (-size
);
69 res
= address_space_read(&s
->source_as
, addr
, attrs
, buf
, size
);
73 /* Bit position in the N bytes read... */
74 bitpos
= (offset
>> 2) & ((size
* 8) - 1);
75 /* ...converted to byte in buffer and bit in byte */
76 bit
= 1 << (bitpos
& 7);
78 buf
[bitpos
>> 3] |= bit
;
80 buf
[bitpos
>> 3] &= ~bit
;
82 return address_space_write(&s
->source_as
, addr
, attrs
, buf
, size
);
85 static const MemoryRegionOps bitband_ops
= {
86 .read_with_attrs
= bitband_read
,
87 .write_with_attrs
= bitband_write
,
88 .endianness
= DEVICE_NATIVE_ENDIAN
,
89 .impl
.min_access_size
= 1,
90 .impl
.max_access_size
= 4,
91 .valid
.min_access_size
= 1,
92 .valid
.max_access_size
= 4,
95 static void bitband_init(Object
*obj
)
97 BitBandState
*s
= BITBAND(obj
);
98 SysBusDevice
*dev
= SYS_BUS_DEVICE(obj
);
100 memory_region_init_io(&s
->iomem
, obj
, &bitband_ops
, s
,
101 "bitband", 0x02000000);
102 sysbus_init_mmio(dev
, &s
->iomem
);
105 static void bitband_realize(DeviceState
*dev
, Error
**errp
)
107 BitBandState
*s
= BITBAND(dev
);
109 if (!s
->source_memory
) {
110 error_setg(errp
, "source-memory property not set");
114 address_space_init(&s
->source_as
, s
->source_memory
, "bitband-source");
119 static const hwaddr bitband_input_addr
[ARMV7M_NUM_BITBANDS
] = {
120 0x20000000, 0x40000000
123 static const hwaddr bitband_output_addr
[ARMV7M_NUM_BITBANDS
] = {
124 0x22000000, 0x42000000
127 static void armv7m_instance_init(Object
*obj
)
129 ARMv7MState
*s
= ARMV7M(obj
);
132 /* Can't init the cpu here, we don't yet know which model to use */
134 memory_region_init(&s
->container
, obj
, "armv7m-container", UINT64_MAX
);
136 object_initialize(&s
->nvic
, sizeof(s
->nvic
), TYPE_NVIC
);
137 qdev_set_parent_bus(DEVICE(&s
->nvic
), sysbus_get_default());
138 object_property_add_alias(obj
, "num-irq",
139 OBJECT(&s
->nvic
), "num-irq", &error_abort
);
141 for (i
= 0; i
< ARRAY_SIZE(s
->bitband
); i
++) {
142 object_initialize(&s
->bitband
[i
], sizeof(s
->bitband
[i
]), TYPE_BITBAND
);
143 qdev_set_parent_bus(DEVICE(&s
->bitband
[i
]), sysbus_get_default());
147 static void armv7m_realize(DeviceState
*dev
, Error
**errp
)
149 ARMv7MState
*s
= ARMV7M(dev
);
154 if (!s
->board_memory
) {
155 error_setg(errp
, "memory property was not set");
159 memory_region_add_subregion_overlap(&s
->container
, 0, s
->board_memory
, -1);
161 s
->cpu
= ARM_CPU(object_new(s
->cpu_type
));
163 object_property_set_link(OBJECT(s
->cpu
), OBJECT(&s
->container
), "memory",
165 object_property_set_bool(OBJECT(s
->cpu
), true, "realized", &err
);
167 error_propagate(errp
, err
);
171 /* Note that we must realize the NVIC after the CPU */
172 object_property_set_bool(OBJECT(&s
->nvic
), true, "realized", &err
);
174 error_propagate(errp
, err
);
178 /* Alias the NVIC's input and output GPIOs as our own so the board
179 * code can wire them up. (We do this in realize because the
180 * NVIC doesn't create the input GPIO array until realize.)
182 qdev_pass_gpios(DEVICE(&s
->nvic
), dev
, NULL
);
183 qdev_pass_gpios(DEVICE(&s
->nvic
), dev
, "SYSRESETREQ");
185 /* Wire the NVIC up to the CPU */
186 sbd
= SYS_BUS_DEVICE(&s
->nvic
);
187 sysbus_connect_irq(sbd
, 0,
188 qdev_get_gpio_in(DEVICE(s
->cpu
), ARM_CPU_IRQ
));
189 s
->cpu
->env
.nvic
= &s
->nvic
;
191 memory_region_add_subregion(&s
->container
, 0xe000e000,
192 sysbus_mmio_get_region(sbd
, 0));
194 for (i
= 0; i
< ARRAY_SIZE(s
->bitband
); i
++) {
195 Object
*obj
= OBJECT(&s
->bitband
[i
]);
196 SysBusDevice
*sbd
= SYS_BUS_DEVICE(&s
->bitband
[i
]);
198 object_property_set_int(obj
, bitband_input_addr
[i
], "base", &err
);
200 error_propagate(errp
, err
);
203 object_property_set_link(obj
, OBJECT(s
->board_memory
),
204 "source-memory", &error_abort
);
205 object_property_set_bool(obj
, true, "realized", &err
);
207 error_propagate(errp
, err
);
211 memory_region_add_subregion(&s
->container
, bitband_output_addr
[i
],
212 sysbus_mmio_get_region(sbd
, 0));
216 static Property armv7m_properties
[] = {
217 DEFINE_PROP_STRING("cpu-type", ARMv7MState
, cpu_type
),
218 DEFINE_PROP_LINK("memory", ARMv7MState
, board_memory
, TYPE_MEMORY_REGION
,
220 DEFINE_PROP_END_OF_LIST(),
223 static void armv7m_class_init(ObjectClass
*klass
, void *data
)
225 DeviceClass
*dc
= DEVICE_CLASS(klass
);
227 dc
->realize
= armv7m_realize
;
228 dc
->props
= armv7m_properties
;
231 static const TypeInfo armv7m_info
= {
233 .parent
= TYPE_SYS_BUS_DEVICE
,
234 .instance_size
= sizeof(ARMv7MState
),
235 .instance_init
= armv7m_instance_init
,
236 .class_init
= armv7m_class_init
,
239 static void armv7m_reset(void *opaque
)
241 ARMCPU
*cpu
= opaque
;
246 /* Init CPU and memory for a v7-M based board.
247 mem_size is in bytes.
248 Returns the ARMv7M device. */
250 DeviceState
*armv7m_init(MemoryRegion
*system_memory
, int mem_size
, int num_irq
,
251 const char *kernel_filename
, const char *cpu_type
)
255 armv7m
= qdev_create(NULL
, TYPE_ARMV7M
);
256 qdev_prop_set_uint32(armv7m
, "num-irq", num_irq
);
257 qdev_prop_set_string(armv7m
, "cpu-type", cpu_type
);
258 object_property_set_link(OBJECT(armv7m
), OBJECT(get_system_memory()),
259 "memory", &error_abort
);
260 /* This will exit with an error if the user passed us a bad cpu_type */
261 qdev_init_nofail(armv7m
);
263 armv7m_load_kernel(ARM_CPU(first_cpu
), kernel_filename
, mem_size
);
267 void armv7m_load_kernel(ARMCPU
*cpu
, const char *kernel_filename
, int mem_size
)
274 #ifdef TARGET_WORDS_BIGENDIAN
280 if (!kernel_filename
&& !qtest_enabled()) {
281 fprintf(stderr
, "Guest image must be specified (using -kernel)\n");
285 if (kernel_filename
) {
286 image_size
= load_elf(kernel_filename
, NULL
, NULL
, &entry
, &lowaddr
,
287 NULL
, big_endian
, EM_ARM
, 1, 0);
288 if (image_size
< 0) {
289 image_size
= load_image_targphys(kernel_filename
, 0, mem_size
);
292 if (image_size
< 0) {
293 error_report("Could not load kernel '%s'", kernel_filename
);
298 /* CPU objects (unlike devices) are not automatically reset on system
299 * reset, so we must always register a handler to do so. Unlike
300 * A-profile CPUs, we don't need to do anything special in the
301 * handler to arrange that it starts correctly.
302 * This is arguably the wrong place to do this, but it matches the
303 * way A-profile does it. Note that this means that every M profile
304 * board must call this function!
306 qemu_register_reset(armv7m_reset
, cpu
);
309 static Property bitband_properties
[] = {
310 DEFINE_PROP_UINT32("base", BitBandState
, base
, 0),
311 DEFINE_PROP_LINK("source-memory", BitBandState
, source_memory
,
312 TYPE_MEMORY_REGION
, MemoryRegion
*),
313 DEFINE_PROP_END_OF_LIST(),
316 static void bitband_class_init(ObjectClass
*klass
, void *data
)
318 DeviceClass
*dc
= DEVICE_CLASS(klass
);
320 dc
->realize
= bitband_realize
;
321 dc
->props
= bitband_properties
;
324 static const TypeInfo bitband_info
= {
325 .name
= TYPE_BITBAND
,
326 .parent
= TYPE_SYS_BUS_DEVICE
,
327 .instance_size
= sizeof(BitBandState
),
328 .instance_init
= bitband_init
,
329 .class_init
= bitband_class_init
,
332 static void armv7m_register_types(void)
334 type_register_static(&bitband_info
);
335 type_register_static(&armv7m_info
);
338 type_init(armv7m_register_types
)