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
  20 #ifdef TARGET_WORDS_BIGENDIAN
  21 #define BIOS_FILENAME "mips_bios.bin"
  22 #else
  23 #define BIOS_FILENAME "mipsel_bios.bin"
  24 #endif
  25
  26 #define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
  27
  28 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  29
  30 #define MAX_IDE_BUS 2
  31
  32 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  33 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  34 static const int ide_irq[2] = { 14, 15 };
  35
  36 static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
  37 static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };
  38
  39 static PITState *pit; /* PIT i8254 */
  40
  41 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */
  42
  43 static struct _loaderparams {
  44     int ram_size;
  45     const char *kernel_filename;
  46     const char *kernel_cmdline;
  47     const char *initrd_filename;
  48 } loaderparams;
  49
  50 static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,
  51                               uint32_t val)
  52 {
  53     if ((addr & 0xffff) == 0 && val == 42)
  54         qemu_system_reset_request ();
  55     else if ((addr & 0xffff) == 4 && val == 42)
  56         qemu_system_shutdown_request ();
  57 }
  58
  59 static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)
  60 {
  61     return 0;
  62 }
  63
  64 static CPUWriteMemoryFunc *mips_qemu_write[] = {
  65     &mips_qemu_writel,
  66     &mips_qemu_writel,
  67     &mips_qemu_writel,
  68 };
  69
  70 static CPUReadMemoryFunc *mips_qemu_read[] = {
  71     &mips_qemu_readl,
  72     &mips_qemu_readl,
  73     &mips_qemu_readl,
  74 };
  75
  76 static int mips_qemu_iomemtype = 0;
  77
  78 static void load_kernel (CPUState *env)
  79 {
  80     int64_t entry, kernel_low, kernel_high;
  81     long kernel_size, initrd_size;
  82     ram_addr_t initrd_offset;
  83     int ret;
  84
  85     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  86                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  87                            (uint64_t *)&kernel_high);
  88     if (kernel_size >= 0) {
  89         if ((entry & ~0x7fffffffULL) == 0x80000000)
  90             entry = (int32_t)entry;
  91         env->active_tc.PC = entry;
  92     } else {
  93         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  94                 loaderparams.kernel_filename);
  95         exit(1);
  96     }
  97
  98     /* load initrd */
  99     initrd_size = 0;
 100     initrd_offset = 0;
 101     if (loaderparams.initrd_filename) {
 102         initrd_size = get_image_size (loaderparams.initrd_filename);
 103         if (initrd_size > 0) {
 104             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
 105             if (initrd_offset + initrd_size > ram_size) {
 106                 fprintf(stderr,
 107                         "qemu: memory too small for initial ram disk '%s'\n",
 108                         loaderparams.initrd_filename);
 109                 exit(1);
 110             }
 111             initrd_size = load_image_targphys(loaderparams.initrd_filename,
 112                                               initrd_offset,
 113                                               ram_size - initrd_offset);
 114         }
 115         if (initrd_size == (target_ulong) -1) {
 116             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 117                     loaderparams.initrd_filename);
 118             exit(1);
 119         }
 120     }
 121
 122     /* Store command line.  */
 123     if (initrd_size > 0) {
 124         char buf[64];
 125         ret = snprintf(buf, 64, "rd_start=0x" TARGET_FMT_lx " rd_size=%li ",
 126                        PHYS_TO_VIRT((uint32_t)initrd_offset),
 127                        initrd_size);
 128         cpu_physical_memory_write((16 << 20) - 256, (void *)buf, 64);
 129     } else {
 130         ret = 0;
 131     }
 132     pstrcpy_targphys((16 << 20) - 256 + ret, 256,
 133                      loaderparams.kernel_cmdline);
 134
 135     stl_phys((16 << 20) - 260, 0x12345678);
 136     stl_phys((16 << 20) - 264, ram_size);
 137 }
 138
 139 static void main_cpu_reset(void *opaque)
 140 {
 141     CPUState *env = opaque;
 142     cpu_reset(env);
 143
 144     if (loaderparams.kernel_filename)
 145         load_kernel (env);
 146 }
 147
 148 static const int sector_len = 32 * 1024;
 149 static
 150 void mips_r4k_init (ram_addr_t ram_size, int vga_ram_size,
 151                     const char *boot_device,
 152                     const char *kernel_filename, const char *kernel_cmdline,
 153                     const char *initrd_filename, const char *cpu_model)
 154 {
 155     char buf[1024];
 156     ram_addr_t ram_offset;
 157     ram_addr_t bios_offset;
 158     int bios_size;
 159     CPUState *env;
 160     RTCState *rtc_state;
 161     int i;
 162     qemu_irq *i8259;
 163     int index;
 164     BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
 165
 166     /* init CPUs */
 167     if (cpu_model == NULL) {
 168 #ifdef TARGET_MIPS64
 169         cpu_model = "R4000";
 170 #else
 171         cpu_model = "24Kf";
 172 #endif
 173     }
 174     env = cpu_init(cpu_model);
 175     if (!env) {
 176         fprintf(stderr, "Unable to find CPU definition\n");
 177         exit(1);
 178     }
 179     qemu_register_reset(main_cpu_reset, env);
 180
 181     /* allocate RAM */
 182     if (ram_size > (256 << 20)) {
 183         fprintf(stderr,
 184                 "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
 185                 ((unsigned int)ram_size / (1 << 20)));
 186         exit(1);
 187     }
 188     ram_offset = qemu_ram_alloc(ram_size);
 189
 190     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 191
 192     if (!mips_qemu_iomemtype) {
 193         mips_qemu_iomemtype = cpu_register_io_memory(0, mips_qemu_read,
 194                                                      mips_qemu_write, NULL);
 195     }
 196     cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
 197
 198     /* Try to load a BIOS image. If this fails, we continue regardless,
 199        but initialize the hardware ourselves. When a kernel gets
 200        preloaded we also initialize the hardware, since the BIOS wasn't
 201        run. */
 202     if (bios_name == NULL)
 203         bios_name = BIOS_FILENAME;
 204     snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
 205     bios_size = get_image_size(buf);
 206     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
 207         bios_offset = qemu_ram_alloc(BIOS_SIZE);
 208         cpu_register_physical_memory(0x1fc00000, BIOS_SIZE,
 209                                      bios_offset | IO_MEM_ROM);
 210
 211         load_image_targphys(buf, 0x1fc00000, BIOS_SIZE);
 212     } else if ((index = drive_get_index(IF_PFLASH, 0, 0)) > -1) {
 213         uint32_t mips_rom = 0x00400000;
 214         bios_offset = qemu_ram_alloc(mips_rom);
 215         if (!pflash_cfi01_register(0x1fc00000, bios_offset,
 216             drives_table[index].bdrv, sector_len, mips_rom / sector_len,
 217             4, 0, 0, 0, 0)) {
 218             fprintf(stderr, "qemu: Error registering flash memory.\n");
 219         }
 220     }
 221     else {
 222         /* not fatal */
 223         fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
 224                 buf);
 225     }
 226
 227     if (kernel_filename) {
 228         loaderparams.ram_size = ram_size;
 229         loaderparams.kernel_filename = kernel_filename;
 230         loaderparams.kernel_cmdline = kernel_cmdline;
 231         loaderparams.initrd_filename = initrd_filename;
 232         load_kernel (env);
 233     }
 234
 235     /* Init CPU internal devices */
 236     cpu_mips_irq_init_cpu(env);
 237     cpu_mips_clock_init(env);
 238
 239     /* The PIC is attached to the MIPS CPU INT0 pin */
 240     i8259 = i8259_init(env->irq[2]);
 241
 242     rtc_state = rtc_init(0x70, i8259[8], 2000);
 243
 244     /* Register 64 KB of ISA IO space at 0x14000000 */
 245     isa_mmio_init(0x14000000, 0x00010000);
 246     isa_mem_base = 0x10000000;
 247
 248     pit = pit_init(0x40, i8259[0]);
 249
 250     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
 251         if (serial_hds[i]) {
 252             serial_init(serial_io[i], i8259[serial_irq[i]], 115200,
 253                         serial_hds[i]);
 254         }
 255     }
 256
 257     isa_vga_init(vga_ram_size);
 258
 259     if (nd_table[0].vlan)
 260         isa_ne2000_init(0x300, i8259[9], &nd_table[0]);
 261
 262     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
 263         fprintf(stderr, "qemu: too many IDE bus\n");
 264         exit(1);
 265     }
 266
 267     for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
 268         index = drive_get_index(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
 269         if (index != -1)
 270             hd[i] = drives_table[index].bdrv;
 271         else
 272             hd[i] = NULL;
 273     }
 274
 275     for(i = 0; i < MAX_IDE_BUS; i++)
 276         isa_ide_init(ide_iobase[i], ide_iobase2[i], i8259[ide_irq[i]],
 277                      hd[MAX_IDE_DEVS * i],
 278                      hd[MAX_IDE_DEVS * i + 1]);
 279
 280     i8042_init(i8259[1], i8259[12], 0x60);
 281 }
 282
 283 QEMUMachine mips_machine = {
 284     .name = "mips",
 285     .desc = "mips r4k platform",
 286     .init = mips_r4k_init,
 287 };