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, "nvic", &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")) {
 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")) {
 177         if (!object_property_set_uint(OBJECT(s->cpu), "init-svtor",
 178                                       s->init_svtor, errp)) {
 179             return;
 180         }
 181     }
 182     if (object_property_find(OBJECT(s->cpu), "start-powered-off")) {
 183         if (!object_property_set_bool(OBJECT(s->cpu), "start-powered-off",
 184                                       s->start_powered_off, errp)) {
 185             return;
 186         }
 187     }
 188     if (object_property_find(OBJECT(s->cpu), "vfp")) {
 189         if (!object_property_set_bool(OBJECT(s->cpu), "vfp", s->vfp, errp)) {
 190             return;
 191         }
 192     }
 193     if (object_property_find(OBJECT(s->cpu), "dsp")) {
 194         if (!object_property_set_bool(OBJECT(s->cpu), "dsp", s->dsp, errp)) {
 195             return;
 196         }
 197     }
 198
 199     /*
 200      * Tell the CPU where the NVIC is; it will fail realize if it doesn't
 201      * have one. Similarly, tell the NVIC where its CPU is.
 202      */
 203     s->cpu->env.nvic = &s->nvic;
 204     s->nvic.cpu = s->cpu;
 205
 206     if (!qdev_realize(DEVICE(s->cpu), NULL, errp)) {
 207         return;
 208     }
 209
 210     /* Note that we must realize the NVIC after the CPU */
 211     if (!sysbus_realize(SYS_BUS_DEVICE(&s->nvic), errp)) {
 212         return;
 213     }
 214
 215     /* Alias the NVIC's input and output GPIOs as our own so the board
 216      * code can wire them up. (We do this in realize because the
 217      * NVIC doesn't create the input GPIO array until realize.)
 218      */
 219     qdev_pass_gpios(DEVICE(&s->nvic), dev, NULL);
 220     qdev_pass_gpios(DEVICE(&s->nvic), dev, "SYSRESETREQ");
 221     qdev_pass_gpios(DEVICE(&s->nvic), dev, "NMI");
 222
 223     /* Wire the NVIC up to the CPU */
 224     sbd = SYS_BUS_DEVICE(&s->nvic);
 225     sysbus_connect_irq(sbd, 0,
 226                        qdev_get_gpio_in(DEVICE(s->cpu), ARM_CPU_IRQ));
 227
 228     memory_region_add_subregion(&s->container, 0xe0000000,
 229                                 sysbus_mmio_get_region(sbd, 0));
 230
 231     for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
 232         if (s->enable_bitband) {
 233             Object *obj = OBJECT(&s->bitband[i]);
 234             SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
 235
 236             if (!object_property_set_int(obj, "base",
 237                                          bitband_input_addr[i], errp)) {
 238                 return;
 239             }
 240             object_property_set_link(obj, "source-memory",
 241                                      OBJECT(s->board_memory), &error_abort);
 242             if (!sysbus_realize(SYS_BUS_DEVICE(obj), errp)) {
 243                 return;
 244             }
 245
 246             memory_region_add_subregion(&s->container, bitband_output_addr[i],
 247                                         sysbus_mmio_get_region(sbd, 0));
 248         } else {
 249             object_unparent(OBJECT(&s->bitband[i]));
 250         }
 251     }
 252 }
 253
 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,
 257                      MemoryRegion *),
 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,
 262                      false),
 263     DEFINE_PROP_BOOL("vfp", ARMv7MState, vfp, true),
 264     DEFINE_PROP_BOOL("dsp", ARMv7MState, dsp, true),
 265     DEFINE_PROP_END_OF_LIST(),
 266 };
 267
 268 static void armv7m_class_init(ObjectClass *klass, void *data)
 269 {
 270     DeviceClass *dc = DEVICE_CLASS(klass);
 271
 272     dc->realize = armv7m_realize;
 273     device_class_set_props(dc, armv7m_properties);
 274 }
 275
 276 static const TypeInfo armv7m_info = {
 277     .name = TYPE_ARMV7M,
 278     .parent = TYPE_SYS_BUS_DEVICE,
 279     .instance_size = sizeof(ARMv7MState),
 280     .instance_init = armv7m_instance_init,
 281     .class_init = armv7m_class_init,
 282 };
 283
 284 static void armv7m_reset(void *opaque)
 285 {
 286     ARMCPU *cpu = opaque;
 287
 288     cpu_reset(CPU(cpu));
 289 }
 290
 291 void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
 292 {
 293     int image_size;
 294     uint64_t entry;
 295     int big_endian;
 296     AddressSpace *as;
 297     int asidx;
 298     CPUState *cs = CPU(cpu);
 299
 300 #ifdef TARGET_WORDS_BIGENDIAN
 301     big_endian = 1;
 302 #else
 303     big_endian = 0;
 304 #endif
 305
 306     if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
 307         asidx = ARMASIdx_S;
 308     } else {
 309         asidx = ARMASIdx_NS;
 310     }
 311     as = cpu_get_address_space(cs, asidx);
 312
 313     if (kernel_filename) {
 314         image_size = load_elf_as(kernel_filename, NULL, NULL, NULL,
 315                                  &entry, NULL, NULL,
 316                                  NULL, big_endian, EM_ARM, 1, 0, as);
 317         if (image_size < 0) {
 318             image_size = load_image_targphys_as(kernel_filename, 0,
 319                                                 mem_size, as);
 320         }
 321         if (image_size < 0) {
 322             error_report("Could not load kernel '%s'", kernel_filename);
 323             exit(1);
 324         }
 325     }
 326
 327     /* CPU objects (unlike devices) are not automatically reset on system
 328      * reset, so we must always register a handler to do so. Unlike
 329      * A-profile CPUs, we don't need to do anything special in the
 330      * handler to arrange that it starts correctly.
 331      * This is arguably the wrong place to do this, but it matches the
 332      * way A-profile does it. Note that this means that every M profile
 333      * board must call this function!
 334      */
 335     qemu_register_reset(armv7m_reset, cpu);
 336 }
 337
 338 static Property bitband_properties[] = {
 339     DEFINE_PROP_UINT32("base", BitBandState, base, 0),
 340     DEFINE_PROP_LINK("source-memory", BitBandState, source_memory,
 341                      TYPE_MEMORY_REGION, MemoryRegion *),
 342     DEFINE_PROP_END_OF_LIST(),
 343 };
 344
 345 static void bitband_class_init(ObjectClass *klass, void *data)
 346 {
 347     DeviceClass *dc = DEVICE_CLASS(klass);
 348
 349     dc->realize = bitband_realize;
 350     device_class_set_props(dc, bitband_properties);
 351 }
 352
 353 static const TypeInfo bitband_info = {
 354     .name          = TYPE_BITBAND,
 355     .parent        = TYPE_SYS_BUS_DEVICE,
 356     .instance_size = sizeof(BitBandState),
 357     .instance_init = bitband_init,
 358     .class_init    = bitband_class_init,
 359 };
 360
 361 static void armv7m_register_types(void)
 362 {
 363     type_register_static(&bitband_info);
 364     type_register_static(&armv7m_info);
 365 }
 366
 367 type_init(armv7m_register_types)