2 * QEMU/mipssim emulation
4 * Emulates a very simple machine model similiar to the one use by the
5 * proprietary MIPS emulator.
7 * Copyright (c) 2007 Thiemo Seufer
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:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
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
29 #ifdef TARGET_WORDS_BIGENDIAN
30 #define BIOS_FILENAME "mips_bios.bin"
32 #define BIOS_FILENAME "mipsel_bios.bin"
36 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
38 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
41 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
43 static void load_kernel (CPUState *env)
45 int64_t entry, kernel_low, kernel_high;
48 ram_addr_t initrd_offset;
50 kernel_size = load_elf(env->kernel_filename, VIRT_TO_PHYS_ADDEND,
51 &entry, &kernel_low, &kernel_high);
52 if (kernel_size >= 0) {
53 if ((entry & ~0x7fffffffULL) == 0x80000000)
54 entry = (int32_t)entry;
55 env->PC[env->current_tc] = entry;
57 fprintf(stderr, "qemu: could not load kernel '%s'\n",
58 env->kernel_filename);
65 if (env->initrd_filename) {
66 initrd_size = get_image_size (env->initrd_filename);
67 if (initrd_size > 0) {
68 initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
69 if (initrd_offset + initrd_size > env->ram_size) {
71 "qemu: memory too small for initial ram disk '%s'\n",
72 env->initrd_filename);
75 initrd_size = load_image(env->initrd_filename,
76 phys_ram_base + initrd_offset);
78 if (initrd_size == (target_ulong) -1) {
79 fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
80 env->initrd_filename);
86 static void main_cpu_reset(void *opaque)
88 CPUState *env = opaque;
90 cpu_mips_register(env, NULL);
92 if (env->kernel_filename)
97 mips_mipssim_init (int ram_size, int vga_ram_size, const char *boot_device,
98 DisplayState *ds, const char **fd_filename, int snapshot,
99 const char *kernel_filename, const char *kernel_cmdline,
100 const char *initrd_filename, const char *cpu_model)
103 unsigned long bios_offset;
109 if (cpu_model == NULL) {
116 if (mips_find_by_name(cpu_model, &def) != 0)
119 cpu_mips_register(env, def);
120 register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
121 qemu_register_reset(main_cpu_reset, env);
124 cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
126 /* Load a BIOS / boot exception handler image. */
127 bios_offset = ram_size + vga_ram_size;
128 if (bios_name == NULL)
129 bios_name = BIOS_FILENAME;
130 snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
131 bios_size = load_image(buf, phys_ram_base + bios_offset);
132 if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
133 /* Bail out if we have neither a kernel image nor boot vector code. */
135 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
139 /* Map the BIOS / boot exception handler. */
140 cpu_register_physical_memory(0x1fc00000LL,
141 bios_size, bios_offset | IO_MEM_ROM);
142 /* We have a boot vector start address. */
143 env->PC[env->current_tc] = (target_long)(int32_t)0xbfc00000;
146 if (kernel_filename) {
147 env->ram_size = ram_size;
148 env->kernel_filename = kernel_filename;
149 env->kernel_cmdline = kernel_cmdline;
150 env->initrd_filename = initrd_filename;
154 /* Init CPU internal devices. */
155 cpu_mips_irq_init_cpu(env);
156 cpu_mips_clock_init(env);
157 cpu_mips_irqctrl_init();
159 /* Register 64 KB of ISA IO space at 0x1fd00000. */
160 isa_mmio_init(0x1fd00000, 0x00010000);
162 /* A single 16450 sits at offset 0x3f8. It is attached to
163 MIPS CPU INT2, which is interrupt 4. */
165 serial_init(0x3f8, env->irq[4], serial_hds[0]);
167 if (nd_table[0].vlan) {
168 if (nd_table[0].model == NULL
169 || strcmp(nd_table[0].model, "mipsnet") == 0) {
170 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
171 mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
172 } else if (strcmp(nd_table[0].model, "?") == 0) {
173 fprintf(stderr, "qemu: Supported NICs: mipsnet\n");
176 fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
182 QEMUMachine mips_mipssim_machine = {
184 "MIPS MIPSsim platform",