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 "qemu-common.h"
  14 #include "cpu.h"
  15 #include "hw/sysbus.h"
  16 #include "hw/arm/arm.h"
  17 #include "hw/loader.h"
  18 #include "elf.h"
  19 #include "sysemu/qtest.h"
  20 #include "qemu/error-report.h"
  21 #include "exec/address-spaces.h"
  22 #include "target/arm/idau.h"
  23
  24 /* Bitbanded IO.  Each word corresponds to a single bit.  */
  25
  26 /* Get the byte address of the real memory for a bitband access.  */
  27 static inline hwaddr bitband_addr(BitBandState *s, hwaddr offset)
  28 {
  29     return s->base | (offset & 0x1ffffff) >> 5;
  30 }
  31
  32 static MemTxResult bitband_read(void *opaque, hwaddr offset,
  33                                 uint64_t *data, unsigned size, MemTxAttrs attrs)
  34 {
  35     BitBandState *s = opaque;
  36     uint8_t buf[4];
  37     MemTxResult res;
  38     int bitpos, bit;
  39     hwaddr addr;
  40
  41     assert(size <= 4);
  42
  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);
  46     if (res) {
  47         return res;
  48     }
  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;
  53     *data = bit;
  54     return MEMTX_OK;
  55 }
  56
  57 static MemTxResult bitband_write(void *opaque, hwaddr offset, uint64_t value,
  58                                  unsigned size, MemTxAttrs attrs)
  59 {
  60     BitBandState *s = opaque;
  61     uint8_t buf[4];
  62     MemTxResult res;
  63     int bitpos, bit;
  64     hwaddr addr;
  65
  66     assert(size <= 4);
  67
  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);
  71     if (res) {
  72         return res;
  73     }
  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);
  78     if (value & 1) {
  79         buf[bitpos >> 3] |= bit;
  80     } else {
  81         buf[bitpos >> 3] &= ~bit;
  82     }
  83     return address_space_write(&s->source_as, addr, attrs, buf, size);
  84 }
  85
  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,
  94 };
  95
  96 static void bitband_init(Object *obj)
  97 {
  98     BitBandState *s = BITBAND(obj);
  99     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 100
 101     memory_region_init_io(&s->iomem, obj, &bitband_ops, s,
 102                           "bitband", 0x02000000);
 103     sysbus_init_mmio(dev, &s->iomem);
 104 }
 105
 106 static void bitband_realize(DeviceState *dev, Error **errp)
 107 {
 108     BitBandState *s = BITBAND(dev);
 109
 110     if (!s->source_memory) {
 111         error_setg(errp, "source-memory property not set");
 112         return;
 113     }
 114
 115     address_space_init(&s->source_as, s->source_memory, "bitband-source");
 116 }
 117
 118 /* Board init.  */
 119
 120 static const hwaddr bitband_input_addr[ARMV7M_NUM_BITBANDS] = {
 121     0x20000000, 0x40000000
 122 };
 123
 124 static const hwaddr bitband_output_addr[ARMV7M_NUM_BITBANDS] = {
 125     0x22000000, 0x42000000
 126 };
 127
 128 static void armv7m_instance_init(Object *obj)
 129 {
 130     ARMv7MState *s = ARMV7M(obj);
 131     int i;
 132
 133     /* Can't init the cpu here, we don't yet know which model to use */
 134
 135     memory_region_init(&s->container, obj, "armv7m-container", UINT64_MAX);
 136
 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);
 140
 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);
 144     }
 145 }
 146
 147 static void armv7m_realize(DeviceState *dev, Error **errp)
 148 {
 149     ARMv7MState *s = ARMV7M(dev);
 150     SysBusDevice *sbd;
 151     Error *err = NULL;
 152     int i;
 153
 154     if (!s->board_memory) {
 155         error_setg(errp, "memory property was not set");
 156         return;
 157     }
 158
 159     memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
 160
 161     s->cpu = ARM_CPU(object_new_with_props(s->cpu_type, OBJECT(s), "cpu",
 162                                            &err, NULL));
 163     if (err != NULL) {
 164         error_propagate(errp, err);
 165         return;
 166     }
 167
 168     object_property_set_link(OBJECT(s->cpu), OBJECT(&s->container), "memory",
 169                              &error_abort);
 170     if (object_property_find(OBJECT(s->cpu), "idau", NULL)) {
 171         object_property_set_link(OBJECT(s->cpu), s->idau, "idau", &err);
 172         if (err != NULL) {
 173             error_propagate(errp, err);
 174             return;
 175         }
 176     }
 177     if (object_property_find(OBJECT(s->cpu), "init-svtor", NULL)) {
 178         object_property_set_uint(OBJECT(s->cpu), s->init_svtor,
 179                                  "init-svtor", &err);
 180         if (err != NULL) {
 181             error_propagate(errp, err);
 182             return;
 183         }
 184     }
 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);
 188         if (err != NULL) {
 189             error_propagate(errp, err);
 190             return;
 191         }
 192     }
 193
 194     /*
 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.
 197      */
 198     s->cpu->env.nvic = &s->nvic;
 199     s->nvic.cpu = s->cpu;
 200
 201     object_property_set_bool(OBJECT(s->cpu), true, "realized", &err);
 202     if (err != NULL) {
 203         error_propagate(errp, err);
 204         return;
 205     }
 206
 207     /* Note that we must realize the NVIC after the CPU */
 208     object_property_set_bool(OBJECT(&s->nvic), true, "realized", &err);
 209     if (err != NULL) {
 210         error_propagate(errp, err);
 211         return;
 212     }
 213
 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.)
 217      */
 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");
 221
 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));
 226
 227     memory_region_add_subregion(&s->container, 0xe000e000,
 228                                 sysbus_mmio_get_region(sbd, 0));
 229
 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]);
 234
 235             object_property_set_int(obj, bitband_input_addr[i], "base", &err);
 236             if (err != NULL) {
 237                 error_propagate(errp, err);
 238                 return;
 239             }
 240             object_property_set_link(obj, OBJECT(s->board_memory),
 241                                      "source-memory", &error_abort);
 242             object_property_set_bool(obj, true, "realized", &err);
 243             if (err != NULL) {
 244                 error_propagate(errp, err);
 245                 return;
 246             }
 247
 248             memory_region_add_subregion(&s->container, bitband_output_addr[i],
 249                                         sysbus_mmio_get_region(sbd, 0));
 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_END_OF_LIST(),
 264 };
 265
 266 static void armv7m_class_init(ObjectClass *klass, void *data)
 267 {
 268     DeviceClass *dc = DEVICE_CLASS(klass);
 269
 270     dc->realize = armv7m_realize;
 271     dc->props = armv7m_properties;
 272 }
 273
 274 static const TypeInfo armv7m_info = {
 275     .name = TYPE_ARMV7M,
 276     .parent = TYPE_SYS_BUS_DEVICE,
 277     .instance_size = sizeof(ARMv7MState),
 278     .instance_init = armv7m_instance_init,
 279     .class_init = armv7m_class_init,
 280 };
 281
 282 static void armv7m_reset(void *opaque)
 283 {
 284     ARMCPU *cpu = opaque;
 285
 286     cpu_reset(CPU(cpu));
 287 }
 288
 289 void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
 290 {
 291     int image_size;
 292     uint64_t entry;
 293     uint64_t lowaddr;
 294     int big_endian;
 295     AddressSpace *as;
 296     int asidx;
 297     CPUState *cs = CPU(cpu);
 298
 299 #ifdef TARGET_WORDS_BIGENDIAN
 300     big_endian = 1;
 301 #else
 302     big_endian = 0;
 303 #endif
 304
 305     if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
 306         asidx = ARMASIdx_S;
 307     } else {
 308         asidx = ARMASIdx_NS;
 309     }
 310     as = cpu_get_address_space(cs, asidx);
 311
 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,
 317                                                 mem_size, as);
 318             lowaddr = 0;
 319         }
 320         if (image_size < 0) {
 321             error_report("Could not load kernel '%s'", kernel_filename);
 322             exit(1);
 323         }
 324     }
 325
 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!
 333      */
 334     qemu_register_reset(armv7m_reset, cpu);
 335 }
 336
 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(),
 342 };
 343
 344 static void bitband_class_init(ObjectClass *klass, void *data)
 345 {
 346     DeviceClass *dc = DEVICE_CLASS(klass);
 347
 348     dc->realize = bitband_realize;
 349     dc->props = bitband_properties;
 350 }
 351
 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,
 358 };
 359
 360 static void armv7m_register_types(void)
 361 {
 362     type_register_static(&bitband_info);
 363     type_register_static(&armv7m_info);
 364 }
 365
 366 type_init(armv7m_register_types)