hw/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 "sysbus.h"
  11 #include "arm-misc.h"
  12 #include "loader.h"
  13 #include "elf.h"
  14
  15 /* Bitbanded IO.  Each word corresponds to a single bit.  */
  16
  17 /* Get the byte address of the real memory for a bitband access.  */
  18 static inline uint32_t bitband_addr(void * opaque, uint32_t addr)
  19 {
  20     uint32_t res;
  21
  22     res = *(uint32_t *)opaque;
  23     res |= (addr & 0x1ffffff) >> 5;
  24     return res;
  25
  26 }
  27
  28 static uint32_t bitband_readb(void *opaque, target_phys_addr_t offset)
  29 {
  30     uint8_t v;
  31     cpu_physical_memory_read(bitband_addr(opaque, offset), &v, 1);
  32     return (v & (1 << ((offset >> 2) & 7))) != 0;
  33 }
  34
  35 static void bitband_writeb(void *opaque, target_phys_addr_t offset,
  36                            uint32_t value)
  37 {
  38     uint32_t addr;
  39     uint8_t mask;
  40     uint8_t v;
  41     addr = bitband_addr(opaque, offset);
  42     mask = (1 << ((offset >> 2) & 7));
  43     cpu_physical_memory_read(addr, &v, 1);
  44     if (value & 1)
  45         v |= mask;
  46     else
  47         v &= ~mask;
  48     cpu_physical_memory_write(addr, &v, 1);
  49 }
  50
  51 static uint32_t bitband_readw(void *opaque, target_phys_addr_t offset)
  52 {
  53     uint32_t addr;
  54     uint16_t mask;
  55     uint16_t v;
  56     addr = bitband_addr(opaque, offset) & ~1;
  57     mask = (1 << ((offset >> 2) & 15));
  58     mask = tswap16(mask);
  59     cpu_physical_memory_read(addr, (uint8_t *)&v, 2);
  60     return (v & mask) != 0;
  61 }
  62
  63 static void bitband_writew(void *opaque, target_phys_addr_t offset,
  64                            uint32_t value)
  65 {
  66     uint32_t addr;
  67     uint16_t mask;
  68     uint16_t v;
  69     addr = bitband_addr(opaque, offset) & ~1;
  70     mask = (1 << ((offset >> 2) & 15));
  71     mask = tswap16(mask);
  72     cpu_physical_memory_read(addr, (uint8_t *)&v, 2);
  73     if (value & 1)
  74         v |= mask;
  75     else
  76         v &= ~mask;
  77     cpu_physical_memory_write(addr, (uint8_t *)&v, 2);
  78 }
  79
  80 static uint32_t bitband_readl(void *opaque, target_phys_addr_t offset)
  81 {
  82     uint32_t addr;
  83     uint32_t mask;
  84     uint32_t v;
  85     addr = bitband_addr(opaque, offset) & ~3;
  86     mask = (1 << ((offset >> 2) & 31));
  87     mask = tswap32(mask);
  88     cpu_physical_memory_read(addr, (uint8_t *)&v, 4);
  89     return (v & mask) != 0;
  90 }
  91
  92 static void bitband_writel(void *opaque, target_phys_addr_t offset,
  93                            uint32_t value)
  94 {
  95     uint32_t addr;
  96     uint32_t mask;
  97     uint32_t v;
  98     addr = bitband_addr(opaque, offset) & ~3;
  99     mask = (1 << ((offset >> 2) & 31));
 100     mask = tswap32(mask);
 101     cpu_physical_memory_read(addr, (uint8_t *)&v, 4);
 102     if (value & 1)
 103         v |= mask;
 104     else
 105         v &= ~mask;
 106     cpu_physical_memory_write(addr, (uint8_t *)&v, 4);
 107 }
 108
 109 static const MemoryRegionOps bitband_ops = {
 110     .old_mmio = {
 111         .read = { bitband_readb, bitband_readw, bitband_readl, },
 112         .write = { bitband_writeb, bitband_writew, bitband_writel, },
 113     },
 114     .endianness = DEVICE_NATIVE_ENDIAN,
 115 };
 116
 117 typedef struct {
 118     SysBusDevice busdev;
 119     MemoryRegion iomem;
 120     uint32_t base;
 121 } BitBandState;
 122
 123 static int bitband_init(SysBusDevice *dev)
 124 {
 125     BitBandState *s = FROM_SYSBUS(BitBandState, dev);
 126
 127     memory_region_init_io(&s->iomem, &bitband_ops, &s->base, "bitband",
 128                           0x02000000);
 129     sysbus_init_mmio(dev, &s->iomem);
 130     return 0;
 131 }
 132
 133 static void armv7m_bitband_init(void)
 134 {
 135     DeviceState *dev;
 136
 137     dev = qdev_create(NULL, "ARM,bitband-memory");
 138     qdev_prop_set_uint32(dev, "base", 0x20000000);
 139     qdev_init_nofail(dev);
 140     sysbus_mmio_map(sysbus_from_qdev(dev), 0, 0x22000000);
 141
 142     dev = qdev_create(NULL, "ARM,bitband-memory");
 143     qdev_prop_set_uint32(dev, "base", 0x40000000);
 144     qdev_init_nofail(dev);
 145     sysbus_mmio_map(sysbus_from_qdev(dev), 0, 0x42000000);
 146 }
 147
 148 /* Board init.  */
 149
 150 static void armv7m_reset(void *opaque)
 151 {
 152     ARMCPU *cpu = opaque;
 153
 154     cpu_reset(CPU(cpu));
 155 }
 156
 157 /* Init CPU and memory for a v7-M based board.
 158    flash_size and sram_size are in kb.
 159    Returns the NVIC array.  */
 160
 161 qemu_irq *armv7m_init(MemoryRegion *address_space_mem,
 162                       int flash_size, int sram_size,
 163                       const char *kernel_filename, const char *cpu_model)
 164 {
 165     ARMCPU *cpu;
 166     CPUARMState *env;
 167     DeviceState *nvic;
 168     /* FIXME: make this local state.  */
 169     static qemu_irq pic[64];
 170     qemu_irq *cpu_pic;
 171     int image_size;
 172     uint64_t entry;
 173     uint64_t lowaddr;
 174     int i;
 175     int big_endian;
 176     MemoryRegion *sram = g_new(MemoryRegion, 1);
 177     MemoryRegion *flash = g_new(MemoryRegion, 1);
 178     MemoryRegion *hack = g_new(MemoryRegion, 1);
 179
 180     flash_size *= 1024;
 181     sram_size *= 1024;
 182
 183     if (cpu_model == NULL) {
 184         cpu_model = "cortex-m3";
 185     }
 186     cpu = cpu_arm_init(cpu_model);
 187     if (cpu == NULL) {
 188         fprintf(stderr, "Unable to find CPU definition\n");
 189         exit(1);
 190     }
 191     env = &cpu->env;
 192
 193 #if 0
 194     /* > 32Mb SRAM gets complicated because it overlaps the bitband area.
 195        We don't have proper commandline options, so allocate half of memory
 196        as SRAM, up to a maximum of 32Mb, and the rest as code.  */
 197     if (ram_size > (512 + 32) * 1024 * 1024)
 198         ram_size = (512 + 32) * 1024 * 1024;
 199     sram_size = (ram_size / 2) & TARGET_PAGE_MASK;
 200     if (sram_size > 32 * 1024 * 1024)
 201         sram_size = 32 * 1024 * 1024;
 202     code_size = ram_size - sram_size;
 203 #endif
 204
 205     /* Flash programming is done via the SCU, so pretend it is ROM.  */
 206     memory_region_init_ram(flash, "armv7m.flash", flash_size);
 207     vmstate_register_ram_global(flash);
 208     memory_region_set_readonly(flash, true);
 209     memory_region_add_subregion(address_space_mem, 0, flash);
 210     memory_region_init_ram(sram, "armv7m.sram", sram_size);
 211     vmstate_register_ram_global(sram);
 212     memory_region_add_subregion(address_space_mem, 0x20000000, sram);
 213     armv7m_bitband_init();
 214
 215     nvic = qdev_create(NULL, "armv7m_nvic");
 216     env->nvic = nvic;
 217     qdev_init_nofail(nvic);
 218     cpu_pic = arm_pic_init_cpu(cpu);
 219     sysbus_connect_irq(sysbus_from_qdev(nvic), 0, cpu_pic[ARM_PIC_CPU_IRQ]);
 220     for (i = 0; i < 64; i++) {
 221         pic[i] = qdev_get_gpio_in(nvic, i);
 222     }
 223
 224 #ifdef TARGET_WORDS_BIGENDIAN
 225     big_endian = 1;
 226 #else
 227     big_endian = 0;
 228 #endif
 229
 230     image_size = load_elf(kernel_filename, NULL, NULL, &entry, &lowaddr,
 231                           NULL, big_endian, ELF_MACHINE, 1);
 232     if (image_size < 0) {
 233         image_size = load_image_targphys(kernel_filename, 0, flash_size);
 234         lowaddr = 0;
 235     }
 236     if (image_size < 0) {
 237         fprintf(stderr, "qemu: could not load kernel '%s'\n",
 238                 kernel_filename);
 239         exit(1);
 240     }
 241
 242     /* Hack to map an additional page of ram at the top of the address
 243        space.  This stops qemu complaining about executing code outside RAM
 244        when returning from an exception.  */
 245     memory_region_init_ram(hack, "armv7m.hack", 0x1000);
 246     vmstate_register_ram_global(hack);
 247     memory_region_add_subregion(address_space_mem, 0xfffff000, hack);
 248
 249     qemu_register_reset(armv7m_reset, cpu);
 250     return pic;
 251 }
 252
 253 static Property bitband_properties[] = {
 254     DEFINE_PROP_UINT32("base", BitBandState, base, 0),
 255     DEFINE_PROP_END_OF_LIST(),
 256 };
 257
 258 static void bitband_class_init(ObjectClass *klass, void *data)
 259 {
 260     DeviceClass *dc = DEVICE_CLASS(klass);
 261     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 262
 263     k->init = bitband_init;
 264     dc->props = bitband_properties;
 265 }
 266
 267 static TypeInfo bitband_info = {
 268     .name          = "ARM,bitband-memory",
 269     .parent        = TYPE_SYS_BUS_DEVICE,
 270     .instance_size = sizeof(BitBandState),
 271     .class_init    = bitband_class_init,
 272 };
 273
 274 static void armv7m_register_types(void)
 275 {
 276     type_register_static(&bitband_info);
 277 }
 278
 279 type_init(armv7m_register_types)