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
34 #include "mips-bios.h"
39 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
41 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
44 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
46 static struct _loaderparams
{
48 const char *kernel_filename
;
49 const char *kernel_cmdline
;
50 const char *initrd_filename
;
53 static void load_kernel (CPUState
*env
)
55 int64_t entry
, kernel_low
, kernel_high
;
58 ram_addr_t initrd_offset
;
61 #ifdef TARGET_WORDS_BIGENDIAN
67 kernel_size
= load_elf(loaderparams
.kernel_filename
, VIRT_TO_PHYS_ADDEND
,
68 (uint64_t *)&entry
, (uint64_t *)&kernel_low
,
69 (uint64_t *)&kernel_high
, big_endian
, ELF_MACHINE
, 1);
70 if (kernel_size
>= 0) {
71 if ((entry
& ~0x7fffffffULL
) == 0x80000000)
72 entry
= (int32_t)entry
;
73 env
->active_tc
.PC
= 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
);
104 static void main_cpu_reset(void *opaque
)
106 CPUState
*env
= opaque
;
109 if (loaderparams
.kernel_filename
)
114 mips_mipssim_init (ram_addr_t ram_size
,
115 const char *boot_device
,
116 const char *kernel_filename
, const char *kernel_cmdline
,
117 const char *initrd_filename
, const char *cpu_model
)
120 ram_addr_t ram_offset
;
121 ram_addr_t bios_offset
;
126 if (cpu_model
== NULL
) {
133 env
= cpu_init(cpu_model
);
135 fprintf(stderr
, "Unable to find CPU definition\n");
138 qemu_register_reset(main_cpu_reset
, env
);
141 ram_offset
= qemu_ram_alloc(ram_size
);
142 bios_offset
= qemu_ram_alloc(BIOS_SIZE
);
144 cpu_register_physical_memory(0, ram_size
, ram_offset
| IO_MEM_RAM
);
146 /* Map the BIOS / boot exception handler. */
147 cpu_register_physical_memory(0x1fc00000LL
,
148 BIOS_SIZE
, bios_offset
| IO_MEM_ROM
);
149 /* Load a BIOS / boot exception handler image. */
150 if (bios_name
== NULL
)
151 bios_name
= BIOS_FILENAME
;
152 filename
= qemu_find_file(QEMU_FILE_TYPE_BIOS
, bios_name
);
154 bios_size
= load_image_targphys(filename
, 0x1fc00000LL
, BIOS_SIZE
);
159 if ((bios_size
< 0 || bios_size
> BIOS_SIZE
) && !kernel_filename
) {
160 /* Bail out if we have neither a kernel image nor boot vector code. */
162 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
166 /* We have a boot vector start address. */
167 env
->active_tc
.PC
= (target_long
)(int32_t)0xbfc00000;
170 if (kernel_filename
) {
171 loaderparams
.ram_size
= ram_size
;
172 loaderparams
.kernel_filename
= kernel_filename
;
173 loaderparams
.kernel_cmdline
= kernel_cmdline
;
174 loaderparams
.initrd_filename
= initrd_filename
;
178 /* Init CPU internal devices. */
179 cpu_mips_irq_init_cpu(env
);
180 cpu_mips_clock_init(env
);
182 /* Register 64 KB of ISA IO space at 0x1fd00000. */
183 isa_mmio_init(0x1fd00000, 0x00010000);
185 /* A single 16450 sits at offset 0x3f8. It is attached to
186 MIPS CPU INT2, which is interrupt 4. */
188 serial_init(0x3f8, env
->irq
[4], 115200, serial_hds
[0]);
190 if (nd_table
[0].vlan
)
191 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
192 mipsnet_init(0x4200, env
->irq
[2], &nd_table
[0]);
195 static QEMUMachine mips_mipssim_machine
= {
197 .desc
= "MIPS MIPSsim platform",
198 .init
= mips_mipssim_init
,
201 static void mips_mipssim_machine_init(void)
203 qemu_register_machine(&mips_mipssim_machine
);
206 machine_init(mips_mipssim_machine_init
);