2 * QEMU/mipssim emulation
4 * Emulates a very simple machine model similar to the one used 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 #include "mips_cpudevs.h"
35 #include "mips-bios.h"
39 #include "exec-memory.h"
41 static struct _loaderparams
{
43 const char *kernel_filename
;
44 const char *kernel_cmdline
;
45 const char *initrd_filename
;
48 typedef struct ResetData
{
53 static int64_t load_kernel(void)
55 int64_t entry
, kernel_high
;
58 ram_addr_t initrd_offset
;
61 #ifdef TARGET_WORDS_BIGENDIAN
67 kernel_size
= load_elf(loaderparams
.kernel_filename
, cpu_mips_kseg0_to_phys
,
68 NULL
, (uint64_t *)&entry
, NULL
,
69 (uint64_t *)&kernel_high
, big_endian
,
71 if (kernel_size
>= 0) {
72 if ((entry
& ~0x7fffffffULL
) == 0x80000000)
73 entry
= (int32_t)entry
;
75 fprintf(stderr
, "qemu: could not load kernel '%s'\n",
76 loaderparams
.kernel_filename
);
83 if (loaderparams
.initrd_filename
) {
84 initrd_size
= get_image_size (loaderparams
.initrd_filename
);
85 if (initrd_size
> 0) {
86 initrd_offset
= (kernel_high
+ ~TARGET_PAGE_MASK
) & TARGET_PAGE_MASK
;
87 if (initrd_offset
+ initrd_size
> loaderparams
.ram_size
) {
89 "qemu: memory too small for initial ram disk '%s'\n",
90 loaderparams
.initrd_filename
);
93 initrd_size
= load_image_targphys(loaderparams
.initrd_filename
,
94 initrd_offset
, loaderparams
.ram_size
- initrd_offset
);
96 if (initrd_size
== (target_ulong
) -1) {
97 fprintf(stderr
, "qemu: could not load initial ram disk '%s'\n",
98 loaderparams
.initrd_filename
);
105 static void main_cpu_reset(void *opaque
)
107 ResetData
*s
= (ResetData
*)opaque
;
108 CPUMIPSState
*env
= s
->env
;
110 cpu_state_reset(env
);
111 env
->active_tc
.PC
= s
->vector
& ~(target_ulong
)1;
113 env
->hflags
|= MIPS_HFLAG_M16
;
117 static void mipsnet_init(int base
, qemu_irq irq
, NICInfo
*nd
)
122 dev
= qdev_create(NULL
, "mipsnet");
123 qdev_set_nic_properties(dev
, nd
);
124 qdev_init_nofail(dev
);
126 s
= sysbus_from_qdev(dev
);
127 sysbus_connect_irq(s
, 0, irq
);
128 memory_region_add_subregion(get_system_io(),
130 sysbus_mmio_get_region(s
, 0));
134 mips_mipssim_init (ram_addr_t ram_size
,
135 const char *boot_device
,
136 const char *kernel_filename
, const char *kernel_cmdline
,
137 const char *initrd_filename
, const char *cpu_model
)
140 MemoryRegion
*address_space_mem
= get_system_memory();
141 MemoryRegion
*ram
= g_new(MemoryRegion
, 1);
142 MemoryRegion
*bios
= g_new(MemoryRegion
, 1);
144 ResetData
*reset_info
;
148 if (cpu_model
== NULL
) {
155 env
= cpu_init(cpu_model
);
157 fprintf(stderr
, "Unable to find CPU definition\n");
160 reset_info
= g_malloc0(sizeof(ResetData
));
161 reset_info
->env
= env
;
162 reset_info
->vector
= env
->active_tc
.PC
;
163 qemu_register_reset(main_cpu_reset
, reset_info
);
166 memory_region_init_ram(ram
, "mips_mipssim.ram", ram_size
);
167 vmstate_register_ram_global(ram
);
168 memory_region_init_ram(bios
, "mips_mipssim.bios", BIOS_SIZE
);
169 vmstate_register_ram_global(bios
);
170 memory_region_set_readonly(bios
, true);
172 memory_region_add_subregion(address_space_mem
, 0, ram
);
174 /* Map the BIOS / boot exception handler. */
175 memory_region_add_subregion(address_space_mem
, 0x1fc00000LL
, bios
);
176 /* Load a BIOS / boot exception handler image. */
177 if (bios_name
== NULL
)
178 bios_name
= BIOS_FILENAME
;
179 filename
= qemu_find_file(QEMU_FILE_TYPE_BIOS
, bios_name
);
181 bios_size
= load_image_targphys(filename
, 0x1fc00000LL
, BIOS_SIZE
);
186 if ((bios_size
< 0 || bios_size
> BIOS_SIZE
) && !kernel_filename
) {
187 /* Bail out if we have neither a kernel image nor boot vector code. */
189 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
193 /* We have a boot vector start address. */
194 env
->active_tc
.PC
= (target_long
)(int32_t)0xbfc00000;
197 if (kernel_filename
) {
198 loaderparams
.ram_size
= ram_size
;
199 loaderparams
.kernel_filename
= kernel_filename
;
200 loaderparams
.kernel_cmdline
= kernel_cmdline
;
201 loaderparams
.initrd_filename
= initrd_filename
;
202 reset_info
->vector
= load_kernel();
205 /* Init CPU internal devices. */
206 cpu_mips_irq_init_cpu(env
);
207 cpu_mips_clock_init(env
);
209 /* Register 64 KB of ISA IO space at 0x1fd00000. */
210 isa_mmio_init(0x1fd00000, 0x00010000);
212 /* A single 16450 sits at offset 0x3f8. It is attached to
213 MIPS CPU INT2, which is interrupt 4. */
215 serial_init(0x3f8, env
->irq
[4], 115200, serial_hds
[0]);
217 if (nd_table
[0].vlan
)
218 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
219 mipsnet_init(0x4200, env
->irq
[2], &nd_table
[0]);
222 static QEMUMachine mips_mipssim_machine
= {
224 .desc
= "MIPS MIPSsim platform",
225 .init
= mips_mipssim_init
,
228 static void mips_mipssim_machine_init(void)
230 qemu_register_machine(&mips_mipssim_machine
);
233 machine_init(mips_mipssim_machine_init
);