hw/arm/armv7m.c

   1 /*
   2  * ARMV7M System emulation.
   3  *
   4  * Copyright (c) 2006-2007 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "hw/arm/armv7m.h"
  12 #include "qapi/error.h"
  13 #include "cpu.h"
  14 #include "hw/sysbus.h"
  15 #include "hw/arm/boot.h"
  16 #include "hw/loader.h"
  17 #include "hw/qdev-properties.h"
  18 #include "elf.h"
  19 #include "sysemu/qtest.h"
  20 #include "sysemu/reset.h"
  21 #include "qemu/error-report.h"
  22 #include "qemu/module.h"
  23 #include "exec/address-spaces.h"
  24 #include "target/arm/idau.h"
  25
  26 /* Bitbanded IO.  Each word corresponds to a single bit.  */
  27
  28 /* Get the byte address of the real memory for a bitband access.  */
  29 static inline hwaddr bitband_addr(BitBandState *s, hwaddr offset)
  30 {
  31     return s->base | (offset & 0x1ffffff) >> 5;
  32 }
  33
  34 static MemTxResult bitband_read(void *opaque, hwaddr offset,
  35                                 uint64_t *data, unsigned size, MemTxAttrs attrs)
  36 {
  37     BitBandState *s = opaque;
  38     uint8_t buf[4];
  39     MemTxResult res;
  40     int bitpos, bit;
  41     hwaddr addr;
  42
  43     assert(size <= 4);
  44
  45     /* Find address in underlying memory and round down to multiple of size */
  46     addr = bitband_addr(s, offset) & (-size);
  47     res = address_space_read(&s->source_as, addr, attrs, buf, size);
  48     if (res) {
  49         return res;
  50     }
  51     /* Bit position in the N bytes read... */
  52     bitpos = (offset >> 2) & ((size * 8) - 1);
  53     /* ...converted to byte in buffer and bit in byte */
  54     bit = (buf[bitpos >> 3] >> (bitpos & 7)) & 1;
  55     *data = bit;
  56     return MEMTX_OK;
  57 }
  58
  59 static MemTxResult bitband_write(void *opaque, hwaddr offset, uint64_t value,
  60                                  unsigned size, MemTxAttrs attrs)
  61 {
  62     BitBandState *s = opaque;
  63     uint8_t buf[4];
  64     MemTxResult res;
  65     int bitpos, bit;
  66     hwaddr addr;
  67
  68     assert(size <= 4);
  69
  70     /* Find address in underlying memory and round down to multiple of size */
  71     addr = bitband_addr(s, offset) & (-size);
  72     res = address_space_read(&s->source_as, addr, attrs, buf, size);
  73     if (res) {
  74         return res;
  75     }
  76     /* Bit position in the N bytes read... */
  77     bitpos = (offset >> 2) & ((size * 8) - 1);
  78     /* ...converted to byte in buffer and bit in byte */
  79     bit = 1 << (bitpos & 7);
  80     if (value & 1) {
  81         buf[bitpos >> 3] |= bit;
  82     } else {
  83         buf[bitpos >> 3] &= ~bit;
  84     }
  85     return address_space_write(&s->source_as, addr, attrs, buf, size);
  86 }
  87
  88 static const MemoryRegionOps bitband_ops = {
  89     .read_with_attrs = bitband_read,
  90     .write_with_attrs = bitband_write,
  91     .endianness = DEVICE_NATIVE_ENDIAN,
  92     .impl.min_access_size = 1,
  93     .impl.max_access_size = 4,
  94     .valid.min_access_size = 1,
  95     .valid.max_access_size = 4,
  96 };
  97
  98 static void bitband_init(Object *obj)
  99 {
 100     BitBandState *s = BITBAND(obj);
 101     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 102
 103     memory_region_init_io(&s->iomem, obj, &bitband_ops, s,
 104                           "bitband", 0x02000000);
 105     sysbus_init_mmio(dev, &s->iomem);
 106 }
 107
 108 static void bitband_realize(DeviceState *dev, Error **errp)
 109 {
 110     BitBandState *s = BITBAND(dev);
 111
 112     if (!s->source_memory) {
 113         error_setg(errp, "source-memory property not set");
 114         return;
 115     }
 116
 117     address_space_init(&s->source_as, s->source_memory, "bitband-source");
 118 }
 119
 120 /* Board init.  */
 121
 122 static const hwaddr bitband_input_addr[ARMV7M_NUM_BITBANDS] = {
 123     0x20000000, 0x40000000
 124 };
 125
 126 static const hwaddr bitband_output_addr[ARMV7M_NUM_BITBANDS] = {
 127     0x22000000, 0x42000000
 128 };
 129
 130 static void armv7m_instance_init(Object *obj)
 131 {
 132     ARMv7MState *s = ARMV7M(obj);
 133     int i;
 134
 135     /* Can't init the cpu here, we don't yet know which model to use */
 136
 137     memory_region_init(&s->container, obj, "armv7m-container", UINT64_MAX);
 138
 139     object_initialize_child(obj, "nvnic", &s->nvic, TYPE_NVIC);
 140     object_property_add_alias(obj, "num-irq",
 141                               OBJECT(&s->nvic), "num-irq");
 142
 143     for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
 144         object_initialize_child(obj, "bitband[*]", &s->bitband[i],
 145                                 TYPE_BITBAND);
 146     }
 147 }
 148
 149 static void armv7m_realize(DeviceState *dev, Error **errp)
 150 {
 151     ARMv7MState *s = ARMV7M(dev);
 152     SysBusDevice *sbd;
 153     Error *err = NULL;
 154     int i;
 155
 156     if (!s->board_memory) {
 157         error_setg(errp, "memory property was not set");
 158         return;
 159     }
 160
 161     memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
 162
 163     s->cpu = ARM_CPU(object_new_with_props(s->cpu_type, OBJECT(s), "cpu",
 164                                            &err, NULL));
 165     if (err != NULL) {
 166         error_propagate(errp, err);
 167         return;
 168     }
 169
 170     object_property_set_link(OBJECT(s->cpu), "memory", OBJECT(&s->container),
 171                              &error_abort);
 172     if (object_property_find(OBJECT(s->cpu), "idau", NULL)) {
 173         object_property_set_link(OBJECT(s->cpu), "idau", s->idau,
 174                                  &error_abort);
 175     }
 176     if (object_property_find(OBJECT(s->cpu), "init-svtor", NULL)) {
 177         if (!object_property_set_uint(OBJECT(s->cpu), "init-svtor",
 178                                       s->init_svtor, &err)) {
 179             error_propagate(errp, err);
 180             return;
 181         }
 182     }
 183     if (object_property_find(OBJECT(s->cpu), "start-powered-off", NULL)) {
 184         if (!object_property_set_bool(OBJECT(s->cpu), "start-powered-off",
 185                                       s->start_powered_off, &err)) {
 186             error_propagate(errp, err);
 187             return;
 188         }
 189     }
 190     if (object_property_find(OBJECT(s->cpu), "vfp", NULL)) {
 191         if (!object_property_set_bool(OBJECT(s->cpu), "vfp", s->vfp, &err)) {
 192             error_propagate(errp, err);
 193             return;
 194         }
 195     }
 196     if (object_property_find(OBJECT(s->cpu), "dsp", NULL)) {
 197         if (!object_property_set_bool(OBJECT(s->cpu), "dsp", s->dsp, &err)) {
 198             error_propagate(errp, err);
 199             return;
 200         }
 201     }
 202
 203     /*
 204      * Tell the CPU where the NVIC is; it will fail realize if it doesn't
 205      * have one. Similarly, tell the NVIC where its CPU is.
 206      */
 207     s->cpu->env.nvic = &s->nvic;
 208     s->nvic.cpu = s->cpu;
 209
 210     if (!qdev_realize(DEVICE(s->cpu), NULL, &err)) {
 211         error_propagate(errp, err);
 212         return;
 213     }
 214
 215     /* Note that we must realize the NVIC after the CPU */
 216     if (!sysbus_realize(SYS_BUS_DEVICE(&s->nvic), &err)) {
 217         error_propagate(errp, err);
 218         return;
 219     }
 220
 221     /* Alias the NVIC's input and output GPIOs as our own so the board
 222      * code can wire them up. (We do this in realize because the
 223      * NVIC doesn't create the input GPIO array until realize.)
 224      */
 225     qdev_pass_gpios(DEVICE(&s->nvic), dev, NULL);
 226     qdev_pass_gpios(DEVICE(&s->nvic), dev, "SYSRESETREQ");
 227     qdev_pass_gpios(DEVICE(&s->nvic), dev, "NMI");
 228
 229     /* Wire the NVIC up to the CPU */
 230     sbd = SYS_BUS_DEVICE(&s->nvic);
 231     sysbus_connect_irq(sbd, 0,
 232                        qdev_get_gpio_in(DEVICE(s->cpu), ARM_CPU_IRQ));
 233
 234     memory_region_add_subregion(&s->container, 0xe000e000,
 235                                 sysbus_mmio_get_region(sbd, 0));
 236
 237     for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
 238         if (s->enable_bitband) {
 239             Object *obj = OBJECT(&s->bitband[i]);
 240             SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
 241
 242             if (!object_property_set_int(obj, "base",
 243                                          bitband_input_addr[i], &err)) {
 244                 error_propagate(errp, err);
 245                 return;
 246             }
 247             object_property_set_link(obj, "source-memory",
 248                                      OBJECT(s->board_memory), &error_abort);
 249             if (!sysbus_realize(SYS_BUS_DEVICE(obj), &err)) {
 250                 error_propagate(errp, err);
 251                 return;
 252             }
 253
 254             memory_region_add_subregion(&s->container, bitband_output_addr[i],
 255                                         sysbus_mmio_get_region(sbd, 0));
 256         } else {
 257             object_unparent(OBJECT(&s->bitband[i]));
 258         }
 259     }
 260 }
 261
 262 static Property armv7m_properties[] = {
 263     DEFINE_PROP_STRING("cpu-type", ARMv7MState, cpu_type),
 264     DEFINE_PROP_LINK("memory", ARMv7MState, board_memory, TYPE_MEMORY_REGION,
 265                      MemoryRegion *),
 266     DEFINE_PROP_LINK("idau", ARMv7MState, idau, TYPE_IDAU_INTERFACE, Object *),
 267     DEFINE_PROP_UINT32("init-svtor", ARMv7MState, init_svtor, 0),
 268     DEFINE_PROP_BOOL("enable-bitband", ARMv7MState, enable_bitband, false),
 269     DEFINE_PROP_BOOL("start-powered-off", ARMv7MState, start_powered_off,
 270                      false),
 271     DEFINE_PROP_BOOL("vfp", ARMv7MState, vfp, true),
 272     DEFINE_PROP_BOOL("dsp", ARMv7MState, dsp, true),
 273     DEFINE_PROP_END_OF_LIST(),
 274 };
 275
 276 static void armv7m_class_init(ObjectClass *klass, void *data)
 277 {
 278     DeviceClass *dc = DEVICE_CLASS(klass);
 279
 280     dc->realize = armv7m_realize;
 281     device_class_set_props(dc, armv7m_properties);
 282 }
 283
 284 static const TypeInfo armv7m_info = {
 285     .name = TYPE_ARMV7M,
 286     .parent = TYPE_SYS_BUS_DEVICE,
 287     .instance_size = sizeof(ARMv7MState),
 288     .instance_init = armv7m_instance_init,
 289     .class_init = armv7m_class_init,
 290 };
 291
 292 static void armv7m_reset(void *opaque)
 293 {
 294     ARMCPU *cpu = opaque;
 295
 296     cpu_reset(CPU(cpu));
 297 }
 298
 299 void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
 300 {
 301     int image_size;
 302     uint64_t entry;
 303     uint64_t lowaddr;
 304     int big_endian;
 305     AddressSpace *as;
 306     int asidx;
 307     CPUState *cs = CPU(cpu);
 308
 309 #ifdef TARGET_WORDS_BIGENDIAN
 310     big_endian = 1;
 311 #else
 312     big_endian = 0;
 313 #endif
 314
 315     if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
 316         asidx = ARMASIdx_S;
 317     } else {
 318         asidx = ARMASIdx_NS;
 319     }
 320     as = cpu_get_address_space(cs, asidx);
 321
 322     if (kernel_filename) {
 323         image_size = load_elf_as(kernel_filename, NULL, NULL, NULL,
 324                                  &entry, &lowaddr, NULL,
 325                                  NULL, big_endian, EM_ARM, 1, 0, as);
 326         if (image_size < 0) {
 327             image_size = load_image_targphys_as(kernel_filename, 0,
 328                                                 mem_size, as);
 329             lowaddr = 0;
 330         }
 331         if (image_size < 0) {
 332             error_report("Could not load kernel '%s'", kernel_filename);
 333             exit(1);
 334         }
 335     }
 336
 337     /* CPU objects (unlike devices) are not automatically reset on system
 338      * reset, so we must always register a handler to do so. Unlike
 339      * A-profile CPUs, we don't need to do anything special in the
 340      * handler to arrange that it starts correctly.
 341      * This is arguably the wrong place to do this, but it matches the
 342      * way A-profile does it. Note that this means that every M profile
 343      * board must call this function!
 344      */
 345     qemu_register_reset(armv7m_reset, cpu);
 346 }
 347
 348 static Property bitband_properties[] = {
 349     DEFINE_PROP_UINT32("base", BitBandState, base, 0),
 350     DEFINE_PROP_LINK("source-memory", BitBandState, source_memory,
 351                      TYPE_MEMORY_REGION, MemoryRegion *),
 352     DEFINE_PROP_END_OF_LIST(),
 353 };
 354
 355 static void bitband_class_init(ObjectClass *klass, void *data)
 356 {
 357     DeviceClass *dc = DEVICE_CLASS(klass);
 358
 359     dc->realize = bitband_realize;
 360     device_class_set_props(dc, bitband_properties);
 361 }
 362
 363 static const TypeInfo bitband_info = {
 364     .name          = TYPE_BITBAND,
 365     .parent        = TYPE_SYS_BUS_DEVICE,
 366     .instance_size = sizeof(BitBandState),
 367     .instance_init = bitband_init,
 368     .class_init    = bitband_class_init,
 369 };
 370
 371 static void armv7m_register_types(void)
 372 {
 373     type_register_static(&bitband_info);
 374     type_register_static(&armv7m_info);
 375 }
 376
 377 type_init(armv7m_register_types)