1 /* 2 * QEMU/mipssim emulation 3 * 4 * Emulates a very simple machine model similar to the one used 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 28 #include "qemu/osdep.h" 29 #include "qapi/error.h" 30 #include "qemu-common.h" 31 #include "cpu.h" 32 #include "hw/clock.h" 33 #include "hw/mips/mips.h" 34 #include "hw/mips/cpudevs.h" 35 #include "hw/char/serial.h" 36 #include "hw/isa/isa.h" 37 #include "net/net.h" 38 #include "sysemu/sysemu.h" 39 #include "hw/boards.h" 40 #include "hw/mips/bios.h" 41 #include "hw/loader.h" 42 #include "elf.h" 43 #include "hw/sysbus.h" 44 #include "hw/qdev-properties.h" 45 #include "exec/address-spaces.h" 46 #include "qemu/error-report.h" 47 #include "sysemu/qtest.h" 48 #include "sysemu/reset.h" 49 50 static struct _loaderparams { 51 int ram_size; 52 const char *kernel_filename; 53 const char *kernel_cmdline; 54 const char *initrd_filename; 55 } loaderparams; 56 57 typedef struct ResetData { 58 MIPSCPU *cpu; 59 uint64_t vector; 60 } ResetData; 61 62 static int64_t load_kernel(void) 63 { 64 int64_t entry, kernel_high, initrd_size; 65 long kernel_size; 66 ram_addr_t initrd_offset; 67 int big_endian; 68 69 #ifdef TARGET_WORDS_BIGENDIAN 70 big_endian = 1; 71 #else 72 big_endian = 0; 73 #endif 74 75 kernel_size = load_elf(loaderparams.kernel_filename, NULL, 76 cpu_mips_kseg0_to_phys, NULL, 77 (uint64_t *)&entry, NULL, 78 (uint64_t *)&kernel_high, NULL, big_endian, 79 EM_MIPS, 1, 0); 80 if (kernel_size < 0) { 81 error_report("could not load kernel '%s': %s", 82 loaderparams.kernel_filename, 83 load_elf_strerror(kernel_size)); 84 exit(1); 85 } 86 87 /* load initrd */ 88 initrd_size = 0; 89 initrd_offset = 0; 90 if (loaderparams.initrd_filename) { 91 initrd_size = get_image_size(loaderparams.initrd_filename); 92 if (initrd_size > 0) { 93 initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & 94 INITRD_PAGE_MASK; 95 if (initrd_offset + initrd_size > loaderparams.ram_size) { 96 error_report("memory too small for initial ram disk '%s'", 97 loaderparams.initrd_filename); 98 exit(1); 99 } 100 initrd_size = load_image_targphys(loaderparams.initrd_filename, 101 initrd_offset, loaderparams.ram_size - initrd_offset); 102 } 103 if (initrd_size == (target_ulong) -1) { 104 error_report("could not load initial ram disk '%s'", 105 loaderparams.initrd_filename); 106 exit(1); 107 } 108 } 109 return entry; 110 } 111 112 static void main_cpu_reset(void *opaque) 113 { 114 ResetData *s = (ResetData *)opaque; 115 CPUMIPSState *env = &s->cpu->env; 116 117 cpu_reset(CPU(s->cpu)); 118 env->active_tc.PC = s->vector & ~(target_ulong)1; 119 if (s->vector & 1) { 120 env->hflags |= MIPS_HFLAG_M16; 121 } 122 } 123 124 static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd) 125 { 126 DeviceState *dev; 127 SysBusDevice *s; 128 129 dev = qdev_new("mipsnet"); 130 qdev_set_nic_properties(dev, nd); 131 132 s = SYS_BUS_DEVICE(dev); 133 sysbus_realize_and_unref(s, &error_fatal); 134 sysbus_connect_irq(s, 0, irq); 135 memory_region_add_subregion(get_system_io(), 136 base, 137 sysbus_mmio_get_region(s, 0)); 138 } 139 140 static void 141 mips_mipssim_init(MachineState *machine) 142 { 143 const char *kernel_filename = machine->kernel_filename; 144 const char *kernel_cmdline = machine->kernel_cmdline; 145 const char *initrd_filename = machine->initrd_filename; 146 char *filename; 147 MemoryRegion *address_space_mem = get_system_memory(); 148 MemoryRegion *isa = g_new(MemoryRegion, 1); 149 MemoryRegion *bios = g_new(MemoryRegion, 1); 150 Clock *cpuclk; 151 MIPSCPU *cpu; 152 CPUMIPSState *env; 153 ResetData *reset_info; 154 int bios_size; 155 156 cpuclk = clock_new(OBJECT(machine), "cpu-refclk"); 157 #ifdef TARGET_MIPS64 158 clock_set_hz(cpuclk, 6000000); /* 6 MHz */ 159 #else 160 clock_set_hz(cpuclk, 12000000); /* 12 MHz */ 161 #endif 162 163 /* Init CPUs. */ 164 cpu = mips_cpu_create_with_clock(machine->cpu_type, cpuclk); 165 env = &cpu->env; 166 167 reset_info = g_malloc0(sizeof(ResetData)); 168 reset_info->cpu = cpu; 169 reset_info->vector = env->active_tc.PC; 170 qemu_register_reset(main_cpu_reset, reset_info); 171 172 /* Allocate RAM. */ 173 memory_region_init_rom(bios, NULL, "mips_mipssim.bios", BIOS_SIZE, 174 &error_fatal); 175 176 memory_region_add_subregion(address_space_mem, 0, machine->ram); 177 178 /* Map the BIOS / boot exception handler. */ 179 memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios); 180 /* Load a BIOS / boot exception handler image. */ 181 if (bios_name == NULL) { 182 bios_name = BIOS_FILENAME; 183 } 184 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 185 if (filename) { 186 bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE); 187 g_free(filename); 188 } else { 189 bios_size = -1; 190 } 191 if ((bios_size < 0 || bios_size > BIOS_SIZE) && 192 !kernel_filename && !qtest_enabled()) { 193 /* Bail out if we have neither a kernel image nor boot vector code. */ 194 error_report("Could not load MIPS bios '%s', and no " 195 "-kernel argument was specified", bios_name); 196 exit(1); 197 } else { 198 /* We have a boot vector start address. */ 199 env->active_tc.PC = (target_long)(int32_t)0xbfc00000; 200 } 201 202 if (kernel_filename) { 203 loaderparams.ram_size = machine->ram_size; 204 loaderparams.kernel_filename = kernel_filename; 205 loaderparams.kernel_cmdline = kernel_cmdline; 206 loaderparams.initrd_filename = initrd_filename; 207 reset_info->vector = load_kernel(); 208 } 209 210 /* Init CPU internal devices. */ 211 cpu_mips_irq_init_cpu(cpu); 212 cpu_mips_clock_init(cpu); 213 214 /* Register 64 KB of ISA IO space at 0x1fd00000. */ 215 memory_region_init_alias(isa, NULL, "isa_mmio", 216 get_system_io(), 0, 0x00010000); 217 memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa); 218 219 /* 220 * A single 16450 sits at offset 0x3f8. It is attached to 221 * MIPS CPU INT2, which is interrupt 4. 222 */ 223 if (serial_hd(0)) { 224 DeviceState *dev = qdev_new(TYPE_SERIAL_MM); 225 226 qdev_prop_set_chr(dev, "chardev", serial_hd(0)); 227 qdev_prop_set_uint8(dev, "regshift", 0); 228 qdev_prop_set_uint8(dev, "endianness", DEVICE_LITTLE_ENDIAN); 229 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 230 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, env->irq[4]); 231 sysbus_add_io(SYS_BUS_DEVICE(dev), 0x3f8, 232 sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0)); 233 } 234 235 if (nd_table[0].used) 236 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */ 237 mipsnet_init(0x4200, env->irq[2], &nd_table[0]); 238 } 239 240 static void mips_mipssim_machine_init(MachineClass *mc) 241 { 242 mc->desc = "MIPS MIPSsim platform"; 243 mc->init = mips_mipssim_init; 244 #ifdef TARGET_MIPS64 245 mc->default_cpu_type = MIPS_CPU_TYPE_NAME("5Kf"); 246 #else 247 mc->default_cpu_type = MIPS_CPU_TYPE_NAME("24Kf"); 248 #endif 249 mc->default_ram_id = "mips_mipssim.ram"; 250 } 251 252 DEFINE_MACHINE("mipssim", mips_mipssim_machine_init) 253