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
28 #include "qemu/osdep.h"
29 #include "qapi/error.h"
30 #include "qemu-common.h"
32 #include "hw/mips/mips.h"
33 #include "hw/mips/cpudevs.h"
34 #include "hw/char/serial.h"
35 #include "hw/isa/isa.h"
37 #include "sysemu/sysemu.h"
38 #include "hw/boards.h"
39 #include "hw/mips/bios.h"
40 #include "hw/loader.h"
42 #include "hw/sysbus.h"
43 #include "hw/qdev-properties.h"
44 #include "exec/address-spaces.h"
45 #include "qemu/error-report.h"
46 #include "sysemu/qtest.h"
47 #include "sysemu/reset.h"
49 static struct _loaderparams
{
51 const char *kernel_filename
;
52 const char *kernel_cmdline
;
53 const char *initrd_filename
;
56 typedef struct ResetData
{
61 static int64_t load_kernel(void)
63 int64_t entry
, kernel_high
, initrd_size
;
65 ram_addr_t initrd_offset
;
68 #ifdef TARGET_WORDS_BIGENDIAN
74 kernel_size
= load_elf(loaderparams
.kernel_filename
, NULL
,
75 cpu_mips_kseg0_to_phys
, NULL
,
76 (uint64_t *)&entry
, NULL
,
77 (uint64_t *)&kernel_high
, big_endian
,
79 if (kernel_size
>= 0) {
80 if ((entry
& ~0x7fffffffULL
) == 0x80000000) {
81 entry
= (int32_t)entry
;
84 error_report("could not load kernel '%s': %s",
85 loaderparams
.kernel_filename
,
86 load_elf_strerror(kernel_size
));
93 if (loaderparams
.initrd_filename
) {
94 initrd_size
= get_image_size(loaderparams
.initrd_filename
);
95 if (initrd_size
> 0) {
96 initrd_offset
= (kernel_high
+ ~INITRD_PAGE_MASK
) &
98 if (initrd_offset
+ initrd_size
> loaderparams
.ram_size
) {
99 error_report("memory too small for initial ram disk '%s'",
100 loaderparams
.initrd_filename
);
103 initrd_size
= load_image_targphys(loaderparams
.initrd_filename
,
104 initrd_offset
, loaderparams
.ram_size
- initrd_offset
);
106 if (initrd_size
== (target_ulong
) -1) {
107 error_report("could not load initial ram disk '%s'",
108 loaderparams
.initrd_filename
);
115 static void main_cpu_reset(void *opaque
)
117 ResetData
*s
= (ResetData
*)opaque
;
118 CPUMIPSState
*env
= &s
->cpu
->env
;
120 cpu_reset(CPU(s
->cpu
));
121 env
->active_tc
.PC
= s
->vector
& ~(target_ulong
)1;
123 env
->hflags
|= MIPS_HFLAG_M16
;
127 static void mipsnet_init(int base
, qemu_irq irq
, NICInfo
*nd
)
132 dev
= qdev_create(NULL
, "mipsnet");
133 qdev_set_nic_properties(dev
, nd
);
134 qdev_init_nofail(dev
);
136 s
= SYS_BUS_DEVICE(dev
);
137 sysbus_connect_irq(s
, 0, irq
);
138 memory_region_add_subregion(get_system_io(),
140 sysbus_mmio_get_region(s
, 0));
144 mips_mipssim_init(MachineState
*machine
)
146 ram_addr_t ram_size
= machine
->ram_size
;
147 const char *kernel_filename
= machine
->kernel_filename
;
148 const char *kernel_cmdline
= machine
->kernel_cmdline
;
149 const char *initrd_filename
= machine
->initrd_filename
;
151 MemoryRegion
*address_space_mem
= get_system_memory();
152 MemoryRegion
*isa
= g_new(MemoryRegion
, 1);
153 MemoryRegion
*ram
= g_new(MemoryRegion
, 1);
154 MemoryRegion
*bios
= g_new(MemoryRegion
, 1);
157 ResetData
*reset_info
;
161 cpu
= MIPS_CPU(cpu_create(machine
->cpu_type
));
164 reset_info
= g_malloc0(sizeof(ResetData
));
165 reset_info
->cpu
= cpu
;
166 reset_info
->vector
= env
->active_tc
.PC
;
167 qemu_register_reset(main_cpu_reset
, reset_info
);
170 memory_region_allocate_system_memory(ram
, NULL
, "mips_mipssim.ram",
172 memory_region_init_ram(bios
, NULL
, "mips_mipssim.bios", BIOS_SIZE
,
174 memory_region_set_readonly(bios
, true);
176 memory_region_add_subregion(address_space_mem
, 0, ram
);
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
;
184 filename
= qemu_find_file(QEMU_FILE_TYPE_BIOS
, bios_name
);
186 bios_size
= load_image_targphys(filename
, 0x1fc00000LL
, BIOS_SIZE
);
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
);
198 /* We have a boot vector start address. */
199 env
->active_tc
.PC
= (target_long
)(int32_t)0xbfc00000;
202 if (kernel_filename
) {
203 loaderparams
.ram_size
= 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();
210 /* Init CPU internal devices. */
211 cpu_mips_irq_init_cpu(cpu
);
212 cpu_mips_clock_init(cpu
);
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
);
220 * A single 16450 sits at offset 0x3f8. It is attached to
221 * MIPS CPU INT2, which is interrupt 4.
224 DeviceState
*dev
= qdev_create(NULL
, TYPE_SERIAL_IO
);
226 qdev_prop_set_chr(dev
, "chardev", serial_hd(0));
227 qdev_set_legacy_instance_id(dev
, 0x3f8, 2);
228 qdev_init_nofail(dev
);
229 sysbus_connect_irq(SYS_BUS_DEVICE(dev
), 0, env
->irq
[4]);
230 memory_region_add_subregion(get_system_io(), 0x3f8,
231 &SERIAL_IO(dev
)->serial
.io
);
234 if (nd_table
[0].used
)
235 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
236 mipsnet_init(0x4200, env
->irq
[2], &nd_table
[0]);
239 static void mips_mipssim_machine_init(MachineClass
*mc
)
241 mc
->desc
= "MIPS MIPSsim platform";
242 mc
->init
= mips_mipssim_init
;
244 mc
->default_cpu_type
= MIPS_CPU_TYPE_NAME("5Kf");
246 mc
->default_cpu_type
= MIPS_CPU_TYPE_NAME("24Kf");
250 DEFINE_MACHINE("mipssim", mips_mipssim_machine_init
)