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
  36 #ifdef TARGET_MIPS64
  37 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
  38 #else
  39 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
  40 #endif
  41
  42 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  43
  44 static struct _loaderparams {
  45     int ram_size;
  46     const char *kernel_filename;
  47     const char *kernel_cmdline;
  48     const char *initrd_filename;
  49 } loaderparams;
  50
  51 static void load_kernel (CPUState *env)
  52 {
  53     int64_t entry, kernel_low, kernel_high;
  54     long kernel_size;
  55     long initrd_size;
  56     ram_addr_t initrd_offset;
  57
  58     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  59                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  60                            (uint64_t *)&kernel_high);
  61     if (kernel_size >= 0) {
  62         if ((entry & ~0x7fffffffULL) == 0x80000000)
  63             entry = (int32_t)entry;
  64         env->active_tc.PC = entry;
  65     } else {
  66         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  67                 loaderparams.kernel_filename);
  68         exit(1);
  69     }
  70
  71     /* load initrd */
  72     initrd_size = 0;
  73     initrd_offset = 0;
  74     if (loaderparams.initrd_filename) {
  75         initrd_size = get_image_size (loaderparams.initrd_filename);
  76         if (initrd_size > 0) {
  77             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  78             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  79                 fprintf(stderr,
  80                         "qemu: memory too small for initial ram disk '%s'\n",
  81                         loaderparams.initrd_filename);
  82                 exit(1);
  83             }
  84             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  85                 initrd_offset, loaderparams.ram_size - initrd_offset);
  86         }
  87         if (initrd_size == (target_ulong) -1) {
  88             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  89                     loaderparams.initrd_filename);
  90             exit(1);
  91         }
  92     }
  93 }
  94
  95 static void main_cpu_reset(void *opaque)
  96 {
  97     CPUState *env = opaque;
  98     cpu_reset(env);
  99
 100     if (loaderparams.kernel_filename)
 101         load_kernel (env);
 102 }
 103
 104 static void
 105 mips_mipssim_init (ram_addr_t ram_size,
 106                    const char *boot_device,
 107                    const char *kernel_filename, const char *kernel_cmdline,
 108                    const char *initrd_filename, const char *cpu_model)
 109 {
 110     char *filename;
 111     ram_addr_t ram_offset;
 112     ram_addr_t bios_offset;
 113     CPUState *env;
 114     int bios_size;
 115
 116     /* Init CPUs. */
 117     if (cpu_model == NULL) {
 118 #ifdef TARGET_MIPS64
 119         cpu_model = "5Kf";
 120 #else
 121         cpu_model = "24Kf";
 122 #endif
 123     }
 124     env = cpu_init(cpu_model);
 125     if (!env) {
 126         fprintf(stderr, "Unable to find CPU definition\n");
 127         exit(1);
 128     }
 129     qemu_register_reset(main_cpu_reset, 0, env);
 130
 131     /* Allocate RAM. */
 132     ram_offset = qemu_ram_alloc(ram_size);
 133     bios_offset = qemu_ram_alloc(BIOS_SIZE);
 134
 135     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 136
 137     /* Map the BIOS / boot exception handler. */
 138     cpu_register_physical_memory(0x1fc00000LL,
 139                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 140     /* Load a BIOS / boot exception handler image. */
 141     if (bios_name == NULL)
 142         bios_name = BIOS_FILENAME;
 143     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 144     if (filename) {
 145         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 146         qemu_free(filename);
 147     } else {
 148         bios_size = -1;
 149     }
 150     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 151         /* Bail out if we have neither a kernel image nor boot vector code. */
 152         fprintf(stderr,
 153                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 154                 filename);
 155         exit(1);
 156     } else {
 157         /* We have a boot vector start address. */
 158         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 159     }
 160
 161     if (kernel_filename) {
 162         loaderparams.ram_size = ram_size;
 163         loaderparams.kernel_filename = kernel_filename;
 164         loaderparams.kernel_cmdline = kernel_cmdline;
 165         loaderparams.initrd_filename = initrd_filename;
 166         load_kernel(env);
 167     }
 168
 169     /* Init CPU internal devices. */
 170     cpu_mips_irq_init_cpu(env);
 171     cpu_mips_clock_init(env);
 172
 173     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 174     isa_mmio_init(0x1fd00000, 0x00010000);
 175
 176     /* A single 16450 sits at offset 0x3f8. It is attached to
 177        MIPS CPU INT2, which is interrupt 4. */
 178     if (serial_hds[0])
 179         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 180
 181     if (nd_table[0].vlan)
 182         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 183         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 184 }
 185
 186 static QEMUMachine mips_mipssim_machine = {
 187     .name = "mipssim",
 188     .desc = "MIPS MIPSsim platform",
 189     .init = mips_mipssim_init,
 190 };
 191
 192 static void mips_mipssim_machine_init(void)
 193 {
 194     qemu_register_machine(&mips_mipssim_machine);
 195 }
 196
 197 machine_init(mips_mipssim_machine_init);