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"
22 #include "target/arm/idau.h"
24 /* Bitbanded IO. Each word corresponds to a single bit. */
26 /* Get the byte address of the real memory for a bitband access. */
27 static inline hwaddr bitband_addr(BitBandState *s, hwaddr offset)
29 return s->base | (offset & 0x1ffffff) >> 5;
32 static MemTxResult bitband_read(void *opaque, hwaddr offset,
33 uint64_t *data, unsigned size, MemTxAttrs attrs)
35 BitBandState *s = opaque;
43 /* Find address in underlying memory and round down to multiple of size */
44 addr = bitband_addr(s, offset) & (-size);
45 res = address_space_read(&s->source_as, addr, attrs, buf, size);
49 /* Bit position in the N bytes read... */
50 bitpos = (offset >> 2) & ((size * 8) - 1);
51 /* ...converted to byte in buffer and bit in byte */
52 bit = (buf[bitpos >> 3] >> (bitpos & 7)) & 1;
57 static MemTxResult bitband_write(void *opaque, hwaddr offset, uint64_t value,
58 unsigned size, MemTxAttrs attrs)
60 BitBandState *s = opaque;
68 /* Find address in underlying memory and round down to multiple of size */
69 addr = bitband_addr(s, offset) & (-size);
70 res = address_space_read(&s->source_as, addr, attrs, buf, size);
74 /* Bit position in the N bytes read... */
75 bitpos = (offset >> 2) & ((size * 8) - 1);
76 /* ...converted to byte in buffer and bit in byte */
77 bit = 1 << (bitpos & 7);
79 buf[bitpos >> 3] |= bit;
81 buf[bitpos >> 3] &= ~bit;
83 return address_space_write(&s->source_as, addr, attrs, buf, size);
86 static const MemoryRegionOps bitband_ops = {
87 .read_with_attrs = bitband_read,
88 .write_with_attrs = bitband_write,
89 .endianness = DEVICE_NATIVE_ENDIAN,
90 .impl.min_access_size = 1,
91 .impl.max_access_size = 4,
92 .valid.min_access_size = 1,
93 .valid.max_access_size = 4,
96 static void bitband_init(Object *obj)
98 BitBandState *s = BITBAND(obj);
99 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
101 memory_region_init_io(&s->iomem, obj, &bitband_ops, s,
102 "bitband", 0x02000000);
103 sysbus_init_mmio(dev, &s->iomem);
106 static void bitband_realize(DeviceState *dev, Error **errp)
108 BitBandState *s = BITBAND(dev);
110 if (!s->source_memory) {
111 error_setg(errp, "source-memory property not set");
115 address_space_init(&s->source_as, s->source_memory, "bitband-source");
120 static const hwaddr bitband_input_addr[ARMV7M_NUM_BITBANDS] = {
121 0x20000000, 0x40000000
124 static const hwaddr bitband_output_addr[ARMV7M_NUM_BITBANDS] = {
125 0x22000000, 0x42000000
128 static void armv7m_instance_init(Object *obj)
130 ARMv7MState *s = ARMV7M(obj);
133 /* Can't init the cpu here, we don't yet know which model to use */
135 memory_region_init(&s->container, obj, "armv7m-container", UINT64_MAX);
137 sysbus_init_child_obj(obj, "nvnic", &s->nvic, sizeof(s->nvic), TYPE_NVIC);
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 sysbus_init_child_obj(obj, "bitband[*]", &s->bitband[i],
143 sizeof(s->bitband[i]), TYPE_BITBAND);
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_with_props(s->cpu_type, OBJECT(s), "cpu",
164 error_propagate(errp, err);
168 object_property_set_link(OBJECT(s->cpu), OBJECT(&s->container), "memory",
170 if (object_property_find(OBJECT(s->cpu), "idau", NULL)) {
171 object_property_set_link(OBJECT(s->cpu), s->idau, "idau", &err);
173 error_propagate(errp, err);
177 if (object_property_find(OBJECT(s->cpu), "init-svtor", NULL)) {
178 object_property_set_uint(OBJECT(s->cpu), s->init_svtor,
181 error_propagate(errp, err);
185 if (object_property_find(OBJECT(s->cpu), "start-powered-off", NULL)) {
186 object_property_set_bool(OBJECT(s->cpu), s->start_powered_off,
187 "start-powered-off", &err);
189 error_propagate(errp, err);
195 * Tell the CPU where the NVIC is; it will fail realize if it doesn't
196 * have one. Similarly, tell the NVIC where its CPU is.
198 s->cpu->env.nvic = &s->nvic;
199 s->nvic.cpu = s->cpu;
201 object_property_set_bool(OBJECT(s->cpu), true, "realized", &err);
203 error_propagate(errp, err);
207 /* Note that we must realize the NVIC after the CPU */
208 object_property_set_bool(OBJECT(&s->nvic), true, "realized", &err);
210 error_propagate(errp, err);
214 /* Alias the NVIC's input and output GPIOs as our own so the board
215 * code can wire them up. (We do this in realize because the
216 * NVIC doesn't create the input GPIO array until realize.)
218 qdev_pass_gpios(DEVICE(&s->nvic), dev, NULL);
219 qdev_pass_gpios(DEVICE(&s->nvic), dev, "SYSRESETREQ");
220 qdev_pass_gpios(DEVICE(&s->nvic), dev, "NMI");
222 /* Wire the NVIC up to the CPU */
223 sbd = SYS_BUS_DEVICE(&s->nvic);
224 sysbus_connect_irq(sbd, 0,
225 qdev_get_gpio_in(DEVICE(s->cpu), ARM_CPU_IRQ));
227 memory_region_add_subregion(&s->container, 0xe000e000,
228 sysbus_mmio_get_region(sbd, 0));
230 if (s->enable_bitband) {
231 for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
232 Object *obj = OBJECT(&s->bitband[i]);
233 SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
235 object_property_set_int(obj, bitband_input_addr[i], "base", &err);
237 error_propagate(errp, err);
240 object_property_set_link(obj, OBJECT(s->board_memory),
241 "source-memory", &error_abort);
242 object_property_set_bool(obj, true, "realized", &err);
244 error_propagate(errp, err);
248 memory_region_add_subregion(&s->container, bitband_output_addr[i],
249 sysbus_mmio_get_region(sbd, 0));
254 static Property armv7m_properties[] = {
255 DEFINE_PROP_STRING("cpu-type", ARMv7MState, cpu_type),
256 DEFINE_PROP_LINK("memory", ARMv7MState, board_memory, TYPE_MEMORY_REGION,
258 DEFINE_PROP_LINK("idau", ARMv7MState, idau, TYPE_IDAU_INTERFACE, Object *),
259 DEFINE_PROP_UINT32("init-svtor", ARMv7MState, init_svtor, 0),
260 DEFINE_PROP_BOOL("enable-bitband", ARMv7MState, enable_bitband, false),
261 DEFINE_PROP_BOOL("start-powered-off", ARMv7MState, start_powered_off,
263 DEFINE_PROP_END_OF_LIST(),
266 static void armv7m_class_init(ObjectClass *klass, void *data)
268 DeviceClass *dc = DEVICE_CLASS(klass);
270 dc->realize = armv7m_realize;
271 dc->props = armv7m_properties;
274 static const TypeInfo armv7m_info = {
276 .parent = TYPE_SYS_BUS_DEVICE,
277 .instance_size = sizeof(ARMv7MState),
278 .instance_init = armv7m_instance_init,
279 .class_init = armv7m_class_init,
282 static void armv7m_reset(void *opaque)
284 ARMCPU *cpu = opaque;
289 void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
297 CPUState *cs = CPU(cpu);
299 #ifdef TARGET_WORDS_BIGENDIAN
305 if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
310 as = cpu_get_address_space(cs, asidx);
312 if (kernel_filename) {
313 image_size = load_elf_as(kernel_filename, NULL, NULL, &entry, &lowaddr,
314 NULL, big_endian, EM_ARM, 1, 0, as);
315 if (image_size < 0) {
316 image_size = load_image_targphys_as(kernel_filename, 0,
320 if (image_size < 0) {
321 error_report("Could not load kernel '%s'", kernel_filename);
326 /* CPU objects (unlike devices) are not automatically reset on system
327 * reset, so we must always register a handler to do so. Unlike
328 * A-profile CPUs, we don't need to do anything special in the
329 * handler to arrange that it starts correctly.
330 * This is arguably the wrong place to do this, but it matches the
331 * way A-profile does it. Note that this means that every M profile
332 * board must call this function!
334 qemu_register_reset(armv7m_reset, cpu);
337 static Property bitband_properties[] = {
338 DEFINE_PROP_UINT32("base", BitBandState, base, 0),
339 DEFINE_PROP_LINK("source-memory", BitBandState, source_memory,
340 TYPE_MEMORY_REGION, MemoryRegion *),
341 DEFINE_PROP_END_OF_LIST(),
344 static void bitband_class_init(ObjectClass *klass, void *data)
346 DeviceClass *dc = DEVICE_CLASS(klass);
348 dc->realize = bitband_realize;
349 dc->props = bitband_properties;
352 static const TypeInfo bitband_info = {
353 .name = TYPE_BITBAND,
354 .parent = TYPE_SYS_BUS_DEVICE,
355 .instance_size = sizeof(BitBandState),
356 .instance_init = bitband_init,
357 .class_init = bitband_class_init,
360 static void armv7m_register_types(void)
362 type_register_static(&bitband_info);
363 type_register_static(&armv7m_info);
366 type_init(armv7m_register_types)