hw/mips_mipssim.c

   1 /*
   2  * QEMU/mipssim emulation
   3  *
   4  * Emulates a very simple machine model similiar to the one use by the
   5  * proprietary MIPS emulator.
   6  *
   7  * Copyright (c) 2007 Thiemo Seufer
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27 #include "hw.h"
  28 #include "mips.h"
  29 #include "pc.h"
  30 #include "isa.h"
  31 #include "net.h"
  32 #include "sysemu.h"
  33 #include "boards.h"
  34 #include "mips-bios.h"
  35 #include "loader.h"
  36 #include "elf.h"
  37
  38 #ifdef TARGET_MIPS64
  39 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
  40 #else
  41 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
  42 #endif
  43
  44 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  45
  46 static struct _loaderparams {
  47     int ram_size;
  48     const char *kernel_filename;
  49     const char *kernel_cmdline;
  50     const char *initrd_filename;
  51 } loaderparams;
  52
  53 typedef struct ResetData {
  54     CPUState *env;
  55     uint64_t vector;
  56 } ResetData;
  57
  58 static int64_t load_kernel(void)
  59 {
  60     int64_t entry, kernel_low, kernel_high;
  61     long kernel_size;
  62     long initrd_size;
  63     ram_addr_t initrd_offset;
  64     int big_endian;
  65
  66 #ifdef TARGET_WORDS_BIGENDIAN
  67     big_endian = 1;
  68 #else
  69     big_endian = 0;
  70 #endif
  71
  72     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  73                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  74                            (uint64_t *)&kernel_high, big_endian, ELF_MACHINE, 1);
  75     if (kernel_size >= 0) {
  76         if ((entry & ~0x7fffffffULL) == 0x80000000)
  77             entry = (int32_t)entry;
  78     } else {
  79         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  80                 loaderparams.kernel_filename);
  81         exit(1);
  82     }
  83
  84     /* load initrd */
  85     initrd_size = 0;
  86     initrd_offset = 0;
  87     if (loaderparams.initrd_filename) {
  88         initrd_size = get_image_size (loaderparams.initrd_filename);
  89         if (initrd_size > 0) {
  90             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  91             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  92                 fprintf(stderr,
  93                         "qemu: memory too small for initial ram disk '%s'\n",
  94                         loaderparams.initrd_filename);
  95                 exit(1);
  96             }
  97             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  98                 initrd_offset, loaderparams.ram_size - initrd_offset);
  99         }
 100         if (initrd_size == (target_ulong) -1) {
 101             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 102                     loaderparams.initrd_filename);
 103             exit(1);
 104         }
 105     }
 106     return entry;
 107 }
 108
 109 static void main_cpu_reset(void *opaque)
 110 {
 111     ResetData *s = (ResetData *)opaque;
 112     CPUState *env = s->env;
 113
 114     cpu_reset(env);
 115     env->active_tc.PC = s->vector;
 116 }
 117
 118 static void
 119 mips_mipssim_init (ram_addr_t ram_size,
 120                    const char *boot_device,
 121                    const char *kernel_filename, const char *kernel_cmdline,
 122                    const char *initrd_filename, const char *cpu_model)
 123 {
 124     char *filename;
 125     ram_addr_t ram_offset;
 126     ram_addr_t bios_offset;
 127     CPUState *env;
 128     ResetData *reset_info;
 129     int bios_size;
 130
 131     /* Init CPUs. */
 132     if (cpu_model == NULL) {
 133 #ifdef TARGET_MIPS64
 134         cpu_model = "5Kf";
 135 #else
 136         cpu_model = "24Kf";
 137 #endif
 138     }
 139     env = cpu_init(cpu_model);
 140     if (!env) {
 141         fprintf(stderr, "Unable to find CPU definition\n");
 142         exit(1);
 143     }
 144     reset_info = qemu_mallocz(sizeof(ResetData));
 145     reset_info->env = env;
 146     reset_info->vector = env->active_tc.PC;
 147     qemu_register_reset(main_cpu_reset, reset_info);
 148
 149     /* Allocate RAM. */
 150     ram_offset = qemu_ram_alloc(ram_size);
 151     bios_offset = qemu_ram_alloc(BIOS_SIZE);
 152
 153     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 154
 155     /* Map the BIOS / boot exception handler. */
 156     cpu_register_physical_memory(0x1fc00000LL,
 157                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 158     /* Load a BIOS / boot exception handler image. */
 159     if (bios_name == NULL)
 160         bios_name = BIOS_FILENAME;
 161     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 162     if (filename) {
 163         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 164         qemu_free(filename);
 165     } else {
 166         bios_size = -1;
 167     }
 168     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 169         /* Bail out if we have neither a kernel image nor boot vector code. */
 170         fprintf(stderr,
 171                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 172                 filename);
 173         exit(1);
 174     } else {
 175         /* We have a boot vector start address. */
 176         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 177     }
 178
 179     if (kernel_filename) {
 180         loaderparams.ram_size = ram_size;
 181         loaderparams.kernel_filename = kernel_filename;
 182         loaderparams.kernel_cmdline = kernel_cmdline;
 183         loaderparams.initrd_filename = initrd_filename;
 184         reset_info->vector = load_kernel();
 185     }
 186
 187     /* Init CPU internal devices. */
 188     cpu_mips_irq_init_cpu(env);
 189     cpu_mips_clock_init(env);
 190
 191     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 192     isa_mmio_init(0x1fd00000, 0x00010000);
 193
 194     /* A single 16450 sits at offset 0x3f8. It is attached to
 195        MIPS CPU INT2, which is interrupt 4. */
 196     if (serial_hds[0])
 197         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 198
 199     if (nd_table[0].vlan)
 200         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 201         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 202 }
 203
 204 static QEMUMachine mips_mipssim_machine = {
 205     .name = "mipssim",
 206     .desc = "MIPS MIPSsim platform",
 207     .init = mips_mipssim_init,
 208 };
 209
 210 static void mips_mipssim_machine_init(void)
 211 {
 212     qemu_register_machine(&mips_mipssim_machine);
 213 }
 214
 215 machine_init(mips_mipssim_machine_init);