hw/mips_r4k.c

   1 /*
   2  * QEMU/MIPS pseudo-board
   3  *
   4  * emulates a simple machine with ISA-like bus.
   5  * ISA IO space mapped to the 0x14000000 (PHYS) and
   6  * ISA memory at the 0x10000000 (PHYS, 16Mb in size).
   7  * All peripherial devices are attached to this "bus" with
   8  * the standard PC ISA addresses.
   9 */
  10 #include "hw.h"
  11 #include "mips.h"
  12 #include "pc.h"
  13 #include "isa.h"
  14 #include "net.h"
  15 #include "sysemu.h"
  16 #include "boards.h"
  17 #include "flash.h"
  18 #include "qemu-log.h"
  19 #include "mips-bios.h"
  20 #include "ide.h"
  21 #include "loader.h"
  22 #include "elf.h"
  23
  24 #define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
  25
  26 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  27
  28 #define MAX_IDE_BUS 2
  29
  30 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  31 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  32 static const int ide_irq[2] = { 14, 15 };
  33
  34 static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
  35 static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };
  36
  37 static PITState *pit; /* PIT i8254 */
  38
  39 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */
  40
  41 static struct _loaderparams {
  42     int ram_size;
  43     const char *kernel_filename;
  44     const char *kernel_cmdline;
  45     const char *initrd_filename;
  46 } loaderparams;
  47
  48 static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,
  49                               uint32_t val)
  50 {
  51     if ((addr & 0xffff) == 0 && val == 42)
  52         qemu_system_reset_request ();
  53     else if ((addr & 0xffff) == 4 && val == 42)
  54         qemu_system_shutdown_request ();
  55 }
  56
  57 static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)
  58 {
  59     return 0;
  60 }
  61
  62 static CPUWriteMemoryFunc * const mips_qemu_write[] = {
  63     &mips_qemu_writel,
  64     &mips_qemu_writel,
  65     &mips_qemu_writel,
  66 };
  67
  68 static CPUReadMemoryFunc * const mips_qemu_read[] = {
  69     &mips_qemu_readl,
  70     &mips_qemu_readl,
  71     &mips_qemu_readl,
  72 };
  73
  74 static int mips_qemu_iomemtype = 0;
  75
  76 static void load_kernel (CPUState *env)
  77 {
  78     int64_t entry, kernel_low, kernel_high;
  79     long kernel_size, initrd_size;
  80     ram_addr_t initrd_offset;
  81     int ret;
  82     int big_endian;
  83
  84 #ifdef TARGET_WORDS_BIGENDIAN
  85     big_endian = 1;
  86 #else
  87     big_endian = 0;
  88 #endif
  89     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  90                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  91                            (uint64_t *)&kernel_high, big_endian, ELF_MACHINE, 1);
  92     if (kernel_size >= 0) {
  93         if ((entry & ~0x7fffffffULL) == 0x80000000)
  94             entry = (int32_t)entry;
  95         env->active_tc.PC = entry;
  96     } else {
  97         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  98                 loaderparams.kernel_filename);
  99         exit(1);
 100     }
 101
 102     /* load initrd */
 103     initrd_size = 0;
 104     initrd_offset = 0;
 105     if (loaderparams.initrd_filename) {
 106         initrd_size = get_image_size (loaderparams.initrd_filename);
 107         if (initrd_size > 0) {
 108             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
 109             if (initrd_offset + initrd_size > ram_size) {
 110                 fprintf(stderr,
 111                         "qemu: memory too small for initial ram disk '%s'\n",
 112                         loaderparams.initrd_filename);
 113                 exit(1);
 114             }
 115             initrd_size = load_image_targphys(loaderparams.initrd_filename,
 116                                               initrd_offset,
 117                                               ram_size - initrd_offset);
 118         }
 119         if (initrd_size == (target_ulong) -1) {
 120             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 121                     loaderparams.initrd_filename);
 122             exit(1);
 123         }
 124     }
 125
 126     /* Store command line.  */
 127     if (initrd_size > 0) {
 128         char buf[64];
 129         ret = snprintf(buf, 64, "rd_start=0x" TARGET_FMT_lx " rd_size=%li ",
 130                        PHYS_TO_VIRT((uint32_t)initrd_offset),
 131                        initrd_size);
 132         cpu_physical_memory_write((16 << 20) - 256, (void *)buf, 64);
 133     } else {
 134         ret = 0;
 135     }
 136     pstrcpy_targphys((16 << 20) - 256 + ret, 256,
 137                      loaderparams.kernel_cmdline);
 138
 139     stl_phys((16 << 20) - 260, 0x12345678);
 140     stl_phys((16 << 20) - 264, ram_size);
 141 }
 142
 143 static void main_cpu_reset(void *opaque)
 144 {
 145     CPUState *env = opaque;
 146     cpu_reset(env);
 147
 148     if (loaderparams.kernel_filename)
 149         load_kernel (env);
 150 }
 151
 152 static const int sector_len = 32 * 1024;
 153 static
 154 void mips_r4k_init (ram_addr_t ram_size,
 155                     const char *boot_device,
 156                     const char *kernel_filename, const char *kernel_cmdline,
 157                     const char *initrd_filename, const char *cpu_model)
 158 {
 159     char *filename;
 160     ram_addr_t ram_offset;
 161     ram_addr_t bios_offset;
 162     int bios_size;
 163     CPUState *env;
 164     RTCState *rtc_state;
 165     int i;
 166     qemu_irq *i8259;
 167     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
 168     DriveInfo *dinfo;
 169
 170     /* init CPUs */
 171     if (cpu_model == NULL) {
 172 #ifdef TARGET_MIPS64
 173         cpu_model = "R4000";
 174 #else
 175         cpu_model = "24Kf";
 176 #endif
 177     }
 178     env = cpu_init(cpu_model);
 179     if (!env) {
 180         fprintf(stderr, "Unable to find CPU definition\n");
 181         exit(1);
 182     }
 183     qemu_register_reset(main_cpu_reset, env);
 184
 185     /* allocate RAM */
 186     if (ram_size > (256 << 20)) {
 187         fprintf(stderr,
 188                 "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
 189                 ((unsigned int)ram_size / (1 << 20)));
 190         exit(1);
 191     }
 192     ram_offset = qemu_ram_alloc(ram_size);
 193
 194     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 195
 196     if (!mips_qemu_iomemtype) {
 197         mips_qemu_iomemtype = cpu_register_io_memory(mips_qemu_read,
 198                                                      mips_qemu_write, NULL);
 199     }
 200     cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
 201
 202     /* Try to load a BIOS image. If this fails, we continue regardless,
 203        but initialize the hardware ourselves. When a kernel gets
 204        preloaded we also initialize the hardware, since the BIOS wasn't
 205        run. */
 206     if (bios_name == NULL)
 207         bios_name = BIOS_FILENAME;
 208     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 209     if (filename) {
 210         bios_size = get_image_size(filename);
 211     } else {
 212         bios_size = -1;
 213     }
 214     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
 215         bios_offset = qemu_ram_alloc(BIOS_SIZE);
 216         cpu_register_physical_memory(0x1fc00000, BIOS_SIZE,
 217                                      bios_offset | IO_MEM_ROM);
 218
 219         load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
 220     } else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {
 221         uint32_t mips_rom = 0x00400000;
 222         bios_offset = qemu_ram_alloc(mips_rom);
 223         if (!pflash_cfi01_register(0x1fc00000, bios_offset,
 224             dinfo->bdrv, sector_len, mips_rom / sector_len,
 225             4, 0, 0, 0, 0)) {
 226             fprintf(stderr, "qemu: Error registering flash memory.\n");
 227         }
 228     }
 229     else {
 230         /* not fatal */
 231         fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
 232                 bios_name);
 233     }
 234     if (filename) {
 235         qemu_free(filename);
 236     }
 237
 238     if (kernel_filename) {
 239         loaderparams.ram_size = ram_size;
 240         loaderparams.kernel_filename = kernel_filename;
 241         loaderparams.kernel_cmdline = kernel_cmdline;
 242         loaderparams.initrd_filename = initrd_filename;
 243         load_kernel (env);
 244     }
 245
 246     /* Init CPU internal devices */
 247     cpu_mips_irq_init_cpu(env);
 248     cpu_mips_clock_init(env);
 249
 250     /* The PIC is attached to the MIPS CPU INT0 pin */
 251     i8259 = i8259_init(env->irq[2]);
 252     isa_bus_new(NULL);
 253     isa_bus_irqs(i8259);
 254
 255     rtc_state = rtc_init(2000);
 256
 257     /* Register 64 KB of ISA IO space at 0x14000000 */
 258     isa_mmio_init(0x14000000, 0x00010000);
 259     isa_mem_base = 0x10000000;
 260
 261     pit = pit_init(0x40, i8259[0]);
 262
 263     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
 264         if (serial_hds[i]) {
 265             serial_init(serial_io[i], i8259[serial_irq[i]], 115200,
 266                         serial_hds[i]);
 267         }
 268     }
 269
 270     isa_vga_init();
 271
 272     if (nd_table[0].vlan)
 273         isa_ne2000_init(0x300, 9, &nd_table[0]);
 274
 275     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
 276         fprintf(stderr, "qemu: too many IDE bus\n");
 277         exit(1);
 278     }
 279
 280     for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
 281         hd[i] = drive_get(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
 282     }
 283
 284     for(i = 0; i < MAX_IDE_BUS; i++)
 285         isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
 286                      hd[MAX_IDE_DEVS * i],
 287                      hd[MAX_IDE_DEVS * i + 1]);
 288
 289     isa_create_simple("i8042");
 290 }
 291
 292 static QEMUMachine mips_machine = {
 293     .name = "mips",
 294     .desc = "mips r4k platform",
 295     .init = mips_r4k_init,
 296 };
 297
 298 static void mips_machine_init(void)
 299 {
 300     qemu_register_machine(&mips_machine);
 301 }
 302
 303 machine_init(mips_machine_init);