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 "hw/sysbus.h"
  14 #include "hw/arm/boot.h"
  15 #include "hw/loader.h"
  16 #include "hw/qdev-properties.h"
  17 #include "elf.h"
  18 #include "sysemu/reset.h"
  19 #include "qemu/error-report.h"
  20 #include "qemu/module.h"
  21 #include "target/arm/idau.h"
  22
  23 /* Bitbanded IO.  Each word corresponds to a single bit.  */
  24
  25 /* Get the byte address of the real memory for a bitband access.  */
  26 static inline hwaddr bitband_addr(BitBandState *s, hwaddr offset)
  27 {
  28     return s->base | (offset & 0x1ffffff) >> 5;
  29 }
  30
  31 static MemTxResult bitband_read(void *opaque, hwaddr offset,
  32                                 uint64_t *data, unsigned size, MemTxAttrs attrs)
  33 {
  34     BitBandState *s = opaque;
  35     uint8_t buf[4];
  36     MemTxResult res;
  37     int bitpos, bit;
  38     hwaddr addr;
  39
  40     assert(size <= 4);
  41
  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);
  45     if (res) {
  46         return res;
  47     }
  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;
  52     *data = bit;
  53     return MEMTX_OK;
  54 }
  55
  56 static MemTxResult bitband_write(void *opaque, hwaddr offset, uint64_t value,
  57                                  unsigned size, MemTxAttrs attrs)
  58 {
  59     BitBandState *s = opaque;
  60     uint8_t buf[4];
  61     MemTxResult res;
  62     int bitpos, bit;
  63     hwaddr addr;
  64
  65     assert(size <= 4);
  66
  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);
  70     if (res) {
  71         return res;
  72     }
  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);
  77     if (value & 1) {
  78         buf[bitpos >> 3] |= bit;
  79     } else {
  80         buf[bitpos >> 3] &= ~bit;
  81     }
  82     return address_space_write(&s->source_as, addr, attrs, buf, size);
  83 }
  84
  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,
  93 };
  94
  95 static void bitband_init(Object *obj)
  96 {
  97     BitBandState *s = BITBAND(obj);
  98     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
  99
 100     memory_region_init_io(&s->iomem, obj, &bitband_ops, s,
 101                           "bitband", 0x02000000);
 102     sysbus_init_mmio(dev, &s->iomem);
 103 }
 104
 105 static void bitband_realize(DeviceState *dev, Error **errp)
 106 {
 107     BitBandState *s = BITBAND(dev);
 108
 109     if (!s->source_memory) {
 110         error_setg(errp, "source-memory property not set");
 111         return;
 112     }
 113
 114     address_space_init(&s->source_as, s->source_memory, "bitband-source");
 115 }
 116
 117 /* Board init.  */
 118
 119 static const hwaddr bitband_input_addr[ARMV7M_NUM_BITBANDS] = {
 120     0x20000000, 0x40000000
 121 };
 122
 123 static const hwaddr bitband_output_addr[ARMV7M_NUM_BITBANDS] = {
 124     0x22000000, 0x42000000
 125 };
 126
 127 static void armv7m_instance_init(Object *obj)
 128 {
 129     ARMv7MState *s = ARMV7M(obj);
 130     int i;
 131
 132     /* Can't init the cpu here, we don't yet know which model to use */
 133
 134     memory_region_init(&s->container, obj, "armv7m-container", UINT64_MAX);
 135
 136     object_initialize_child(obj, "nvic", &s->nvic, TYPE_NVIC);
 137     object_property_add_alias(obj, "num-irq",
 138                               OBJECT(&s->nvic), "num-irq");
 139
 140     for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
 141         object_initialize_child(obj, "bitband[*]", &s->bitband[i],
 142                                 TYPE_BITBAND);
 143     }
 144 }
 145
 146 static void armv7m_realize(DeviceState *dev, Error **errp)
 147 {
 148     ARMv7MState *s = ARMV7M(dev);
 149     SysBusDevice *sbd;
 150     Error *err = NULL;
 151     int i;
 152
 153     if (!s->board_memory) {
 154         error_setg(errp, "memory property was not set");
 155         return;
 156     }
 157
 158     memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
 159
 160     s->cpu = ARM_CPU(object_new_with_props(s->cpu_type, OBJECT(s), "cpu",
 161                                            &err, NULL));
 162     if (err != NULL) {
 163         error_propagate(errp, err);
 164         return;
 165     }
 166
 167     object_property_set_link(OBJECT(s->cpu), "memory", OBJECT(&s->container),
 168                              &error_abort);
 169     if (object_property_find(OBJECT(s->cpu), "idau")) {
 170         object_property_set_link(OBJECT(s->cpu), "idau", s->idau,
 171                                  &error_abort);
 172     }
 173     if (object_property_find(OBJECT(s->cpu), "init-svtor")) {
 174         if (!object_property_set_uint(OBJECT(s->cpu), "init-svtor",
 175                                       s->init_svtor, errp)) {
 176             return;
 177         }
 178     }
 179     if (object_property_find(OBJECT(s->cpu), "start-powered-off")) {
 180         if (!object_property_set_bool(OBJECT(s->cpu), "start-powered-off",
 181                                       s->start_powered_off, errp)) {
 182             return;
 183         }
 184     }
 185     if (object_property_find(OBJECT(s->cpu), "vfp")) {
 186         if (!object_property_set_bool(OBJECT(s->cpu), "vfp", s->vfp, errp)) {
 187             return;
 188         }
 189     }
 190     if (object_property_find(OBJECT(s->cpu), "dsp")) {
 191         if (!object_property_set_bool(OBJECT(s->cpu), "dsp", s->dsp, errp)) {
 192             return;
 193         }
 194     }
 195
 196     /*
 197      * Tell the CPU where the NVIC is; it will fail realize if it doesn't
 198      * have one. Similarly, tell the NVIC where its CPU is.
 199      */
 200     s->cpu->env.nvic = &s->nvic;
 201     s->nvic.cpu = s->cpu;
 202
 203     if (!qdev_realize(DEVICE(s->cpu), NULL, errp)) {
 204         return;
 205     }
 206
 207     /* Note that we must realize the NVIC after the CPU */
 208     if (!sysbus_realize(SYS_BUS_DEVICE(&s->nvic), errp)) {
 209         return;
 210     }
 211
 212     /* Alias the NVIC's input and output GPIOs as our own so the board
 213      * code can wire them up. (We do this in realize because the
 214      * NVIC doesn't create the input GPIO array until realize.)
 215      */
 216     qdev_pass_gpios(DEVICE(&s->nvic), dev, NULL);
 217     qdev_pass_gpios(DEVICE(&s->nvic), dev, "SYSRESETREQ");
 218     qdev_pass_gpios(DEVICE(&s->nvic), dev, "NMI");
 219
 220     /* Wire the NVIC up to the CPU */
 221     sbd = SYS_BUS_DEVICE(&s->nvic);
 222     sysbus_connect_irq(sbd, 0,
 223                        qdev_get_gpio_in(DEVICE(s->cpu), ARM_CPU_IRQ));
 224
 225     memory_region_add_subregion(&s->container, 0xe0000000,
 226                                 sysbus_mmio_get_region(sbd, 0));
 227
 228     for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
 229         if (s->enable_bitband) {
 230             Object *obj = OBJECT(&s->bitband[i]);
 231             SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
 232
 233             if (!object_property_set_int(obj, "base",
 234                                          bitband_input_addr[i], errp)) {
 235                 return;
 236             }
 237             object_property_set_link(obj, "source-memory",
 238                                      OBJECT(s->board_memory), &error_abort);
 239             if (!sysbus_realize(SYS_BUS_DEVICE(obj), errp)) {
 240                 return;
 241             }
 242
 243             memory_region_add_subregion(&s->container, bitband_output_addr[i],
 244                                         sysbus_mmio_get_region(sbd, 0));
 245         } else {
 246             object_unparent(OBJECT(&s->bitband[i]));
 247         }
 248     }
 249 }
 250
 251 static Property armv7m_properties[] = {
 252     DEFINE_PROP_STRING("cpu-type", ARMv7MState, cpu_type),
 253     DEFINE_PROP_LINK("memory", ARMv7MState, board_memory, TYPE_MEMORY_REGION,
 254                      MemoryRegion *),
 255     DEFINE_PROP_LINK("idau", ARMv7MState, idau, TYPE_IDAU_INTERFACE, Object *),
 256     DEFINE_PROP_UINT32("init-svtor", ARMv7MState, init_svtor, 0),
 257     DEFINE_PROP_BOOL("enable-bitband", ARMv7MState, enable_bitband, false),
 258     DEFINE_PROP_BOOL("start-powered-off", ARMv7MState, start_powered_off,
 259                      false),
 260     DEFINE_PROP_BOOL("vfp", ARMv7MState, vfp, true),
 261     DEFINE_PROP_BOOL("dsp", ARMv7MState, dsp, true),
 262     DEFINE_PROP_END_OF_LIST(),
 263 };
 264
 265 static void armv7m_class_init(ObjectClass *klass, void *data)
 266 {
 267     DeviceClass *dc = DEVICE_CLASS(klass);
 268
 269     dc->realize = armv7m_realize;
 270     device_class_set_props(dc, armv7m_properties);
 271 }
 272
 273 static const TypeInfo armv7m_info = {
 274     .name = TYPE_ARMV7M,
 275     .parent = TYPE_SYS_BUS_DEVICE,
 276     .instance_size = sizeof(ARMv7MState),
 277     .instance_init = armv7m_instance_init,
 278     .class_init = armv7m_class_init,
 279 };
 280
 281 static void armv7m_reset(void *opaque)
 282 {
 283     ARMCPU *cpu = opaque;
 284
 285     cpu_reset(CPU(cpu));
 286 }
 287
 288 void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
 289 {
 290     int image_size;
 291     uint64_t entry;
 292     int big_endian;
 293     AddressSpace *as;
 294     int asidx;
 295     CPUState *cs = CPU(cpu);
 296
 297 #ifdef TARGET_WORDS_BIGENDIAN
 298     big_endian = 1;
 299 #else
 300     big_endian = 0;
 301 #endif
 302
 303     if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
 304         asidx = ARMASIdx_S;
 305     } else {
 306         asidx = ARMASIdx_NS;
 307     }
 308     as = cpu_get_address_space(cs, asidx);
 309
 310     if (kernel_filename) {
 311         image_size = load_elf_as(kernel_filename, NULL, NULL, NULL,
 312                                  &entry, NULL, NULL,
 313                                  NULL, big_endian, EM_ARM, 1, 0, as);
 314         if (image_size < 0) {
 315             image_size = load_image_targphys_as(kernel_filename, 0,
 316                                                 mem_size, as);
 317         }
 318         if (image_size < 0) {
 319             error_report("Could not load kernel '%s'", kernel_filename);
 320             exit(1);
 321         }
 322     }
 323
 324     /* CPU objects (unlike devices) are not automatically reset on system
 325      * reset, so we must always register a handler to do so. Unlike
 326      * A-profile CPUs, we don't need to do anything special in the
 327      * handler to arrange that it starts correctly.
 328      * This is arguably the wrong place to do this, but it matches the
 329      * way A-profile does it. Note that this means that every M profile
 330      * board must call this function!
 331      */
 332     qemu_register_reset(armv7m_reset, cpu);
 333 }
 334
 335 static Property bitband_properties[] = {
 336     DEFINE_PROP_UINT32("base", BitBandState, base, 0),
 337     DEFINE_PROP_LINK("source-memory", BitBandState, source_memory,
 338                      TYPE_MEMORY_REGION, MemoryRegion *),
 339     DEFINE_PROP_END_OF_LIST(),
 340 };
 341
 342 static void bitband_class_init(ObjectClass *klass, void *data)
 343 {
 344     DeviceClass *dc = DEVICE_CLASS(klass);
 345
 346     dc->realize = bitband_realize;
 347     device_class_set_props(dc, bitband_properties);
 348 }
 349
 350 static const TypeInfo bitband_info = {
 351     .name          = TYPE_BITBAND,
 352     .parent        = TYPE_SYS_BUS_DEVICE,
 353     .instance_size = sizeof(BitBandState),
 354     .instance_init = bitband_init,
 355     .class_init    = bitband_class_init,
 356 };
 357
 358 static void armv7m_register_types(void)
 359 {
 360     type_register_static(&bitband_info);
 361     type_register_static(&armv7m_info);
 362 }
 363
 364 type_init(armv7m_register_types)