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
  35 #ifdef TARGET_WORDS_BIGENDIAN
  36 #define BIOS_FILENAME "mips_bios.bin"
  37 #else
  38 #define BIOS_FILENAME "mipsel_bios.bin"
  39 #endif
  40
  41 #ifdef TARGET_MIPS64
  42 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
  43 #else
  44 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
  45 #endif
  46
  47 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  48
  49 static struct _loaderparams {
  50     int ram_size;
  51     const char *kernel_filename;
  52     const char *kernel_cmdline;
  53     const char *initrd_filename;
  54 } loaderparams;
  55
  56 static void load_kernel (CPUState *env)
  57 {
  58     int64_t entry, kernel_low, kernel_high;
  59     long kernel_size;
  60     long initrd_size;
  61     ram_addr_t initrd_offset;
  62
  63     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  64                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  65                            (uint64_t *)&kernel_high);
  66     if (kernel_size >= 0) {
  67         if ((entry & ~0x7fffffffULL) == 0x80000000)
  68             entry = (int32_t)entry;
  69         env->active_tc.PC = entry;
  70     } else {
  71         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  72                 loaderparams.kernel_filename);
  73         exit(1);
  74     }
  75
  76     /* load initrd */
  77     initrd_size = 0;
  78     initrd_offset = 0;
  79     if (loaderparams.initrd_filename) {
  80         initrd_size = get_image_size (loaderparams.initrd_filename);
  81         if (initrd_size > 0) {
  82             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  83             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  84                 fprintf(stderr,
  85                         "qemu: memory too small for initial ram disk '%s'\n",
  86                         loaderparams.initrd_filename);
  87                 exit(1);
  88             }
  89             initrd_size = load_image(loaderparams.initrd_filename,
  90                                      phys_ram_base + initrd_offset);
  91         }
  92         if (initrd_size == (target_ulong) -1) {
  93             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  94                     loaderparams.initrd_filename);
  95             exit(1);
  96         }
  97     }
  98 }
  99
 100 static void main_cpu_reset(void *opaque)
 101 {
 102     CPUState *env = opaque;
 103     cpu_reset(env);
 104
 105     if (loaderparams.kernel_filename)
 106         load_kernel (env);
 107 }
 108
 109 static void
 110 mips_mipssim_init (ram_addr_t ram_size, int vga_ram_size,
 111                    const char *boot_device, DisplayState *ds,
 112                    const char *kernel_filename, const char *kernel_cmdline,
 113                    const char *initrd_filename, const char *cpu_model)
 114 {
 115     char buf[1024];
 116     unsigned long bios_offset;
 117     CPUState *env;
 118     int bios_size;
 119
 120     /* Init CPUs. */
 121     if (cpu_model == NULL) {
 122 #ifdef TARGET_MIPS64
 123         cpu_model = "5Kf";
 124 #else
 125         cpu_model = "24Kf";
 126 #endif
 127     }
 128     env = cpu_init(cpu_model);
 129     if (!env) {
 130         fprintf(stderr, "Unable to find CPU definition\n");
 131         exit(1);
 132     }
 133     qemu_register_reset(main_cpu_reset, env);
 134
 135     /* Allocate RAM. */
 136     cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
 137
 138     /* Load a BIOS / boot exception handler image. */
 139     bios_offset = ram_size + vga_ram_size;
 140     if (bios_name == NULL)
 141         bios_name = BIOS_FILENAME;
 142     snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
 143     bios_size = load_image(buf, phys_ram_base + bios_offset);
 144     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 145         /* Bail out if we have neither a kernel image nor boot vector code. */
 146         fprintf(stderr,
 147                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 148                 buf);
 149         exit(1);
 150     } else {
 151         /* Map the BIOS / boot exception handler. */
 152         cpu_register_physical_memory(0x1fc00000LL,
 153                                      bios_size, bios_offset | IO_MEM_ROM);
 154         /* We have a boot vector start address. */
 155         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 156     }
 157
 158     if (kernel_filename) {
 159         loaderparams.ram_size = ram_size;
 160         loaderparams.kernel_filename = kernel_filename;
 161         loaderparams.kernel_cmdline = kernel_cmdline;
 162         loaderparams.initrd_filename = initrd_filename;
 163         load_kernel(env);
 164     }
 165
 166     /* Init CPU internal devices. */
 167     cpu_mips_irq_init_cpu(env);
 168     cpu_mips_clock_init(env);
 169
 170     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 171     isa_mmio_init(0x1fd00000, 0x00010000);
 172
 173     /* A single 16450 sits at offset 0x3f8. It is attached to
 174        MIPS CPU INT2, which is interrupt 4. */
 175     if (serial_hds[0])
 176         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 177
 178     if (nd_table[0].vlan)
 179         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 180         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 181 }
 182
 183 QEMUMachine mips_mipssim_machine = {
 184     .name = "mipssim",
 185     .desc = "MIPS MIPSsim platform",
 186     .init = mips_mipssim_init,
 187     .ram_require = BIOS_SIZE + VGA_RAM_SIZE /* unused */,
 188     .nodisk_ok = 1,
 189 };