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 struct _loaderparams {
45 const char *kernel_filename;
46 const char *kernel_cmdline;
47 const char *initrd_filename;
50 static void load_kernel (CPUState *env)
52 int64_t entry, kernel_low, kernel_high;
55 ram_addr_t initrd_offset;
57 kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
58 &entry, &kernel_low, &kernel_high);
59 if (kernel_size >= 0) {
60 if ((entry & ~0x7fffffffULL) == 0x80000000)
61 entry = (int32_t)entry;
62 env->PC[env->current_tc] = entry;
64 fprintf(stderr, "qemu: could not load kernel '%s'\n",
65 loaderparams.kernel_filename);
72 if (loaderparams.initrd_filename) {
73 initrd_size = get_image_size (loaderparams.initrd_filename);
74 if (initrd_size > 0) {
75 initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
76 if (initrd_offset + initrd_size > loaderparams.ram_size) {
78 "qemu: memory too small for initial ram disk '%s'\n",
79 loaderparams.initrd_filename);
82 initrd_size = load_image(loaderparams.initrd_filename,
83 phys_ram_base + initrd_offset);
85 if (initrd_size == (target_ulong) -1) {
86 fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
87 loaderparams.initrd_filename);
93 static void main_cpu_reset(void *opaque)
95 CPUState *env = opaque;
98 if (loaderparams.kernel_filename)
103 mips_mipssim_init (int ram_size, int vga_ram_size, const char *boot_device,
104 DisplayState *ds, const char **fd_filename, int snapshot,
105 const char *kernel_filename, const char *kernel_cmdline,
106 const char *initrd_filename, const char *cpu_model)
109 unsigned long bios_offset;
115 if (cpu_model == NULL) {
122 env = cpu_init(cpu_model);
124 fprintf(stderr, "Unable to find CPU definition\n");
127 register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
128 qemu_register_reset(main_cpu_reset, env);
131 cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
133 /* Load a BIOS / boot exception handler image. */
134 bios_offset = ram_size + vga_ram_size;
135 if (bios_name == NULL)
136 bios_name = BIOS_FILENAME;
137 snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
138 bios_size = load_image(buf, phys_ram_base + bios_offset);
139 if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
140 /* Bail out if we have neither a kernel image nor boot vector code. */
142 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
146 /* Map the BIOS / boot exception handler. */
147 cpu_register_physical_memory(0x1fc00000LL,
148 bios_size, bios_offset | IO_MEM_ROM);
149 /* We have a boot vector start address. */
150 env->PC[env->current_tc] = (target_long)(int32_t)0xbfc00000;
153 if (kernel_filename) {
154 loaderparams.ram_size = ram_size;
155 loaderparams.kernel_filename = kernel_filename;
156 loaderparams.kernel_cmdline = kernel_cmdline;
157 loaderparams.initrd_filename = initrd_filename;
161 /* Init CPU internal devices. */
162 cpu_mips_irq_init_cpu(env);
163 cpu_mips_clock_init(env);
164 cpu_mips_irqctrl_init();
166 /* Register 64 KB of ISA IO space at 0x1fd00000. */
167 isa_mmio_init(0x1fd00000, 0x00010000);
169 /* A single 16450 sits at offset 0x3f8. It is attached to
170 MIPS CPU INT2, which is interrupt 4. */
172 serial_init(0x3f8, env->irq[4], serial_hds[0]);
174 if (nd_table[0].vlan) {
175 if (nd_table[0].model == NULL
176 || strcmp(nd_table[0].model, "mipsnet") == 0) {
177 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
178 mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
179 } else if (strcmp(nd_table[0].model, "?") == 0) {
180 fprintf(stderr, "qemu: Supported NICs: mipsnet\n");
183 fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
189 QEMUMachine mips_mipssim_machine = {
191 "MIPS MIPSsim platform",