1 /*
2 * QEMU/mipssim emulation
3 *
4 * Emulates a very simple machine model similar to the one used by the
5 * proprietary MIPS emulator.
6 *
7 * Copyright (c) 2007 Thiemo Seufer
8 *
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:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
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
25 * THE SOFTWARE.
26 */
27
28 #include "qemu/osdep.h"
29 #include "qapi/error.h"
30 #include "qemu/datadir.h"
31 #include "system/address-spaces.h"
32 #include "hw/clock.h"
33 #include "hw/mips/mips.h"
34 #include "hw/char/serial-mm.h"
35 #include "net/net.h"
36 #include "system/system.h"
37 #include "hw/boards.h"
38 #include "hw/loader.h"
39 #include "elf.h"
40 #include "hw/sysbus.h"
41 #include "hw/qdev-properties.h"
42 #include "qemu/error-report.h"
43 #include "system/qtest.h"
44 #include "system/reset.h"
45 #include "cpu.h"
46
47 #define BIOS_SIZE (4 * MiB)
48
49 static struct _loaderparams {
50 int ram_size;
51 const char *kernel_filename;
52 const char *kernel_cmdline;
53 const char *initrd_filename;
54 } loaderparams;
55
56 typedef struct ResetData {
57 MIPSCPU *cpu;
58 uint64_t vector;
59 } ResetData;
60
load_kernel(void)61 static uint64_t load_kernel(void)
62 {
63 uint64_t entry, kernel_high, initrd_size;
64 long kernel_size;
65 ram_addr_t initrd_offset;
66
67 kernel_size = load_elf(loaderparams.kernel_filename, NULL,
68 cpu_mips_kseg0_to_phys, NULL,
69 &entry, NULL,
70 &kernel_high, NULL,
71 TARGET_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB,
72 EM_MIPS, 1, 0);
73 if (kernel_size < 0) {
74 error_report("could not load kernel '%s': %s",
75 loaderparams.kernel_filename,
76 load_elf_strerror(kernel_size));
77 exit(1);
78 }
79
80 /* load initrd */
81 initrd_size = 0;
82 initrd_offset = 0;
83 if (loaderparams.initrd_filename) {
84 initrd_size = get_image_size(loaderparams.initrd_filename);
85 if (initrd_size > 0) {
86 initrd_offset = ROUND_UP(kernel_high, INITRD_PAGE_SIZE);
87 if (initrd_offset + initrd_size > loaderparams.ram_size) {
88 error_report("memory too small for initial ram disk '%s'",
89 loaderparams.initrd_filename);
90 exit(1);
91 }
92 initrd_size = load_image_targphys(loaderparams.initrd_filename,
93 initrd_offset, loaderparams.ram_size - initrd_offset);
94 }
95 if (initrd_size == (target_ulong) -1) {
96 error_report("could not load initial ram disk '%s'",
97 loaderparams.initrd_filename);
98 exit(1);
99 }
100 }
101 return entry;
102 }
103
main_cpu_reset(void * opaque)104 static void main_cpu_reset(void *opaque)
105 {
106 ResetData *s = (ResetData *)opaque;
107 CPUMIPSState *env = &s->cpu->env;
108
109 cpu_reset(CPU(s->cpu));
110 env->active_tc.PC = s->vector & ~(target_ulong)1;
111 if (s->vector & 1) {
112 env->hflags |= MIPS_HFLAG_M16;
113 }
114 }
115
mipsnet_init(int base,qemu_irq irq)116 static void mipsnet_init(int base, qemu_irq irq)
117 {
118 DeviceState *dev;
119 SysBusDevice *s;
120
121 dev = qemu_create_nic_device("mipsnet", true, NULL);
122 if (!dev) {
123 return;
124 }
125
126 s = SYS_BUS_DEVICE(dev);
127 sysbus_realize_and_unref(s, &error_fatal);
128 sysbus_connect_irq(s, 0, irq);
129 memory_region_add_subregion(get_system_io(),
130 base,
131 sysbus_mmio_get_region(s, 0));
132 }
133
134 static void
mips_mipssim_init(MachineState * machine)135 mips_mipssim_init(MachineState *machine)
136 {
137 const char *kernel_filename = machine->kernel_filename;
138 const char *kernel_cmdline = machine->kernel_cmdline;
139 const char *initrd_filename = machine->initrd_filename;
140 const char *bios_name = TARGET_BIG_ENDIAN ? "mips_bios.bin"
141 : "mipsel_bios.bin";
142 char *filename;
143 MemoryRegion *address_space_mem = get_system_memory();
144 MemoryRegion *isa = g_new(MemoryRegion, 1);
145 MemoryRegion *bios = g_new(MemoryRegion, 1);
146 Clock *cpuclk;
147 MIPSCPU *cpu;
148 CPUMIPSState *env;
149 ResetData *reset_info;
150 int bios_size;
151
152 cpuclk = clock_new(OBJECT(machine), "cpu-refclk");
153 #ifdef TARGET_MIPS64
154 clock_set_hz(cpuclk, 6000000); /* 6 MHz */
155 #else
156 clock_set_hz(cpuclk, 12000000); /* 12 MHz */
157 #endif
158
159 /* Init CPUs. */
160 cpu = mips_cpu_create_with_clock(machine->cpu_type, cpuclk,
161 TARGET_BIG_ENDIAN);
162 env = &cpu->env;
163
164 reset_info = g_new0(ResetData, 1);
165 reset_info->cpu = cpu;
166 reset_info->vector = env->active_tc.PC;
167 qemu_register_reset(main_cpu_reset, reset_info);
168
169 /* Allocate RAM. */
170 memory_region_init_rom(bios, NULL, "mips_mipssim.bios", BIOS_SIZE,
171 &error_fatal);
172
173 memory_region_add_subregion(address_space_mem, 0, machine->ram);
174
175 /* Map the BIOS / boot exception handler. */
176 memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
177 /* Load a BIOS / boot exception handler image. */
178 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
179 machine->firmware ?: bios_name);
180 if (filename) {
181 bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
182 g_free(filename);
183 } else {
184 bios_size = -1;
185 }
186 if ((bios_size < 0 || bios_size > BIOS_SIZE) &&
187 machine->firmware && !qtest_enabled()) {
188 /* Bail out if we have neither a kernel image nor boot vector code. */
189 error_report("Could not load MIPS bios '%s'", machine->firmware);
190 exit(1);
191 } else {
192 /* We have a boot vector start address. */
193 env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
194 }
195
196 if (kernel_filename) {
197 loaderparams.ram_size = machine->ram_size;
198 loaderparams.kernel_filename = kernel_filename;
199 loaderparams.kernel_cmdline = kernel_cmdline;
200 loaderparams.initrd_filename = initrd_filename;
201 reset_info->vector = load_kernel();
202 }
203
204 /* Init CPU internal devices. */
205 cpu_mips_irq_init_cpu(cpu);
206 cpu_mips_clock_init(cpu);
207
208 /*
209 * Register 64 KB of ISA IO space at 0x1fd00000. But without interrupts
210 * (except for the hardcoded serial port interrupt) -device cannot work,
211 * so do not expose the ISA bus to the user.
212 */
213 memory_region_init_alias(isa, NULL, "isa_mmio",
214 get_system_io(), 0, 0x00010000);
215 memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa);
216
217 /*
218 * A single 16450 sits at offset 0x3f8. It is attached to
219 * MIPS CPU INT2, which is interrupt 4.
220 */
221 if (serial_hd(0)) {
222 DeviceState *dev = qdev_new(TYPE_SERIAL_MM);
223
224 qdev_prop_set_chr(dev, "chardev", serial_hd(0));
225 qdev_prop_set_uint8(dev, "regshift", 0);
226 qdev_prop_set_uint8(dev, "endianness", DEVICE_LITTLE_ENDIAN);
227 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
228 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, env->irq[4]);
229 memory_region_add_subregion(get_system_io(), 0x3f8,
230 sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0));
231 }
232
233 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
234 mipsnet_init(0x4200, env->irq[2]);
235 }
236
mips_mipssim_machine_init(MachineClass * mc)237 static void mips_mipssim_machine_init(MachineClass *mc)
238 {
239 mc->desc = "MIPS MIPSsim platform";
240 mc->init = mips_mipssim_init;
241 #ifdef TARGET_MIPS64
242 mc->default_cpu_type = MIPS_CPU_TYPE_NAME("5Kf");
243 #else
244 mc->default_cpu_type = MIPS_CPU_TYPE_NAME("24Kf");
245 #endif
246 mc->default_ram_id = "mips_mipssim.ram";
247 }
248
249 DEFINE_MACHINE("mipssim", mips_mipssim_machine_init)
250