2 * QEMU/mipssim emulation
4 * Emulates a very simple machine model similiar to the one use by the
5 * proprietary MIPS emulator.
9 #ifdef TARGET_WORDS_BIGENDIAN
10 #define BIOS_FILENAME "mips_bios.bin"
12 #define BIOS_FILENAME "mipsel_bios.bin"
16 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
18 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
21 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
23 static void load_kernel (CPUState *env)
25 int64_t entry, kernel_low, kernel_high;
28 ram_addr_t initrd_offset;
30 kernel_size = load_elf(env->kernel_filename, VIRT_TO_PHYS_ADDEND,
31 &entry, &kernel_low, &kernel_high);
32 if (kernel_size >= 0) {
33 if ((entry & ~0x7fffffffULL) == 0x80000000)
34 entry = (int32_t)entry;
35 env->PC[env->current_tc] = entry;
37 fprintf(stderr, "qemu: could not load kernel '%s'\n",
38 env->kernel_filename);
45 if (env->initrd_filename) {
46 initrd_size = get_image_size (env->initrd_filename);
47 if (initrd_size > 0) {
48 initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
49 if (initrd_offset + initrd_size > env->ram_size) {
51 "qemu: memory too small for initial ram disk '%s'\n",
52 env->initrd_filename);
55 initrd_size = load_image(env->initrd_filename,
56 phys_ram_base + initrd_offset);
58 if (initrd_size == (target_ulong) -1) {
59 fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
60 env->initrd_filename);
66 static void main_cpu_reset(void *opaque)
68 CPUState *env = opaque;
70 cpu_mips_register(env, NULL);
72 if (env->kernel_filename)
77 mips_mipssim_init (int ram_size, int vga_ram_size, int boot_device,
78 DisplayState *ds, const char **fd_filename, int snapshot,
79 const char *kernel_filename, const char *kernel_cmdline,
80 const char *initrd_filename, const char *cpu_model)
83 unsigned long bios_offset;
89 if (cpu_model == NULL) {
96 if (mips_find_by_name(cpu_model, &def) != 0)
99 cpu_mips_register(env, def);
100 register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
101 qemu_register_reset(main_cpu_reset, env);
104 cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
106 /* Map the BIOS / boot exception handler. */
107 bios_offset = ram_size + vga_ram_size;
109 /* Load a BIOS / boot exception handler image. */
110 if (bios_name == NULL)
111 bios_name = BIOS_FILENAME;
112 snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
113 ret = load_image(buf, phys_ram_base + bios_offset);
114 if ((ret < 0 || ret > BIOS_SIZE) && !kernel_filename) {
115 /* Bail out if we have neither a kernel image nor boot vector code. */
117 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
121 /* We have a boot vector start address. */
122 env->PC[env->current_tc] = (target_long)0xbfc00000;
123 cpu_register_physical_memory(0x1fc00000LL,
124 ret, bios_offset | IO_MEM_ROM);
127 if (kernel_filename) {
128 env->ram_size = ram_size;
129 env->kernel_filename = kernel_filename;
130 env->kernel_cmdline = kernel_cmdline;
131 env->initrd_filename = initrd_filename;
135 /* Init CPU internal devices. */
136 cpu_mips_irq_init_cpu(env);
137 cpu_mips_clock_init(env);
138 cpu_mips_irqctrl_init();
140 /* Register 64 KB of ISA IO space at 0x1fd00000. */
141 isa_mmio_init(0x1fd00000, 0x00010000);
143 /* A single 16450 sits at offset 0x3f8. It is attached to
144 MIPS CPU INT2, which is interrupt 4. */
146 serial_init(0x3f8, env->irq[4], serial_hds[0]);
148 if (nd_table[0].vlan) {
149 if (nd_table[0].model == NULL
150 || strcmp(nd_table[0].model, "mipsnet") == 0) {
151 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
152 mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
153 } else if (strcmp(nd_table[0].model, "?") == 0) {
154 fprintf(stderr, "qemu: Supported NICs: mipsnet\n");
157 fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
163 QEMUMachine mips_mipssim_machine = {
165 "MIPS MIPSsim platform",