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 "exec/address-spaces.h"
44 #include "qemu/error-report.h"
45 #include "sysemu/qtest.h"
46 #include "sysemu/reset.h"
48 static struct _loaderparams
{
50 const char *kernel_filename
;
51 const char *kernel_cmdline
;
52 const char *initrd_filename
;
55 typedef struct ResetData
{
60 static int64_t load_kernel(void)
62 int64_t entry
, kernel_high
, initrd_size
;
64 ram_addr_t initrd_offset
;
67 #ifdef TARGET_WORDS_BIGENDIAN
73 kernel_size
= load_elf(loaderparams
.kernel_filename
, NULL
,
74 cpu_mips_kseg0_to_phys
, NULL
,
75 (uint64_t *)&entry
, NULL
,
76 (uint64_t *)&kernel_high
, big_endian
,
78 if (kernel_size
>= 0) {
79 if ((entry
& ~0x7fffffffULL
) == 0x80000000) {
80 entry
= (int32_t)entry
;
83 error_report("could not load kernel '%s': %s",
84 loaderparams
.kernel_filename
,
85 load_elf_strerror(kernel_size
));
92 if (loaderparams
.initrd_filename
) {
93 initrd_size
= get_image_size(loaderparams
.initrd_filename
);
94 if (initrd_size
> 0) {
95 initrd_offset
= (kernel_high
+ ~INITRD_PAGE_MASK
) &
97 if (initrd_offset
+ initrd_size
> loaderparams
.ram_size
) {
98 error_report("memory too small for initial ram disk '%s'",
99 loaderparams
.initrd_filename
);
102 initrd_size
= load_image_targphys(loaderparams
.initrd_filename
,
103 initrd_offset
, loaderparams
.ram_size
- initrd_offset
);
105 if (initrd_size
== (target_ulong
) -1) {
106 error_report("could not load initial ram disk '%s'",
107 loaderparams
.initrd_filename
);
114 static void main_cpu_reset(void *opaque
)
116 ResetData
*s
= (ResetData
*)opaque
;
117 CPUMIPSState
*env
= &s
->cpu
->env
;
119 cpu_reset(CPU(s
->cpu
));
120 env
->active_tc
.PC
= s
->vector
& ~(target_ulong
)1;
122 env
->hflags
|= MIPS_HFLAG_M16
;
126 static void mipsnet_init(int base
, qemu_irq irq
, NICInfo
*nd
)
131 dev
= qdev_create(NULL
, "mipsnet");
132 qdev_set_nic_properties(dev
, nd
);
133 qdev_init_nofail(dev
);
135 s
= SYS_BUS_DEVICE(dev
);
136 sysbus_connect_irq(s
, 0, irq
);
137 memory_region_add_subregion(get_system_io(),
139 sysbus_mmio_get_region(s
, 0));
143 mips_mipssim_init(MachineState
*machine
)
145 ram_addr_t ram_size
= machine
->ram_size
;
146 const char *kernel_filename
= machine
->kernel_filename
;
147 const char *kernel_cmdline
= machine
->kernel_cmdline
;
148 const char *initrd_filename
= machine
->initrd_filename
;
150 MemoryRegion
*address_space_mem
= get_system_memory();
151 MemoryRegion
*isa
= g_new(MemoryRegion
, 1);
152 MemoryRegion
*ram
= g_new(MemoryRegion
, 1);
153 MemoryRegion
*bios
= g_new(MemoryRegion
, 1);
156 ResetData
*reset_info
;
160 cpu
= MIPS_CPU(cpu_create(machine
->cpu_type
));
163 reset_info
= g_malloc0(sizeof(ResetData
));
164 reset_info
->cpu
= cpu
;
165 reset_info
->vector
= env
->active_tc
.PC
;
166 qemu_register_reset(main_cpu_reset
, reset_info
);
169 memory_region_allocate_system_memory(ram
, NULL
, "mips_mipssim.ram",
171 memory_region_init_ram(bios
, NULL
, "mips_mipssim.bios", BIOS_SIZE
,
173 memory_region_set_readonly(bios
, true);
175 memory_region_add_subregion(address_space_mem
, 0, ram
);
177 /* Map the BIOS / boot exception handler. */
178 memory_region_add_subregion(address_space_mem
, 0x1fc00000LL
, bios
);
179 /* Load a BIOS / boot exception handler image. */
180 if (bios_name
== NULL
) {
181 bios_name
= BIOS_FILENAME
;
183 filename
= qemu_find_file(QEMU_FILE_TYPE_BIOS
, bios_name
);
185 bios_size
= load_image_targphys(filename
, 0x1fc00000LL
, BIOS_SIZE
);
190 if ((bios_size
< 0 || bios_size
> BIOS_SIZE
) &&
191 !kernel_filename
&& !qtest_enabled()) {
192 /* Bail out if we have neither a kernel image nor boot vector code. */
193 error_report("Could not load MIPS bios '%s', and no "
194 "-kernel argument was specified", bios_name
);
197 /* We have a boot vector start address. */
198 env
->active_tc
.PC
= (target_long
)(int32_t)0xbfc00000;
201 if (kernel_filename
) {
202 loaderparams
.ram_size
= ram_size
;
203 loaderparams
.kernel_filename
= kernel_filename
;
204 loaderparams
.kernel_cmdline
= kernel_cmdline
;
205 loaderparams
.initrd_filename
= initrd_filename
;
206 reset_info
->vector
= load_kernel();
209 /* Init CPU internal devices. */
210 cpu_mips_irq_init_cpu(cpu
);
211 cpu_mips_clock_init(cpu
);
213 /* Register 64 KB of ISA IO space at 0x1fd00000. */
214 memory_region_init_alias(isa
, NULL
, "isa_mmio",
215 get_system_io(), 0, 0x00010000);
216 memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa
);
219 * A single 16450 sits at offset 0x3f8. It is attached to
220 * MIPS CPU INT2, which is interrupt 4.
223 serial_init(0x3f8, env
->irq
[4], 115200, serial_hd(0),
226 if (nd_table
[0].used
)
227 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
228 mipsnet_init(0x4200, env
->irq
[2], &nd_table
[0]);
231 static void mips_mipssim_machine_init(MachineClass
*mc
)
233 mc
->desc
= "MIPS MIPSsim platform";
234 mc
->init
= mips_mipssim_init
;
236 mc
->default_cpu_type
= MIPS_CPU_TYPE_NAME("5Kf");
238 mc
->default_cpu_type
= MIPS_CPU_TYPE_NAME("24Kf");
242 DEFINE_MACHINE("mipssim", mips_mipssim_machine_init
)