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1.1 root 1: /*
2: * QEMU/mipssim emulation
3: *
4: * Emulates a very simple machine model similiar to the one use 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: #include "hw.h"
28: #include "mips.h"
29: #include "pc.h"
30: #include "isa.h"
31: #include "net.h"
32: #include "sysemu.h"
33: #include "boards.h"
34:
35: #ifdef TARGET_WORDS_BIGENDIAN
36: #define BIOS_FILENAME "mips_bios.bin"
37: #else
38: #define BIOS_FILENAME "mipsel_bios.bin"
39: #endif
40:
41: #ifdef TARGET_MIPS64
42: #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
43: #else
44: #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
45: #endif
46:
47: #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
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: static void load_kernel (CPUState *env)
57: {
58: int64_t entry, kernel_low, kernel_high;
59: long kernel_size;
60: long initrd_size;
61: ram_addr_t initrd_offset;
62:
63: kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
1.1.1.2 ! root 64: (uint64_t *)&entry, (uint64_t *)&kernel_low,
! 65: (uint64_t *)&kernel_high);
1.1 root 66: if (kernel_size >= 0) {
67: if ((entry & ~0x7fffffffULL) == 0x80000000)
68: entry = (int32_t)entry;
1.1.1.2 ! root 69: env->active_tc.PC = entry;
1.1 root 70: } else {
71: fprintf(stderr, "qemu: could not load kernel '%s'\n",
72: loaderparams.kernel_filename);
73: exit(1);
74: }
75:
76: /* load initrd */
77: initrd_size = 0;
78: initrd_offset = 0;
79: if (loaderparams.initrd_filename) {
80: initrd_size = get_image_size (loaderparams.initrd_filename);
81: if (initrd_size > 0) {
82: initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
83: if (initrd_offset + initrd_size > loaderparams.ram_size) {
84: fprintf(stderr,
85: "qemu: memory too small for initial ram disk '%s'\n",
86: loaderparams.initrd_filename);
87: exit(1);
88: }
89: initrd_size = load_image(loaderparams.initrd_filename,
90: phys_ram_base + initrd_offset);
91: }
92: if (initrd_size == (target_ulong) -1) {
93: fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
94: loaderparams.initrd_filename);
95: exit(1);
96: }
97: }
98: }
99:
100: static void main_cpu_reset(void *opaque)
101: {
102: CPUState *env = opaque;
103: cpu_reset(env);
104:
105: if (loaderparams.kernel_filename)
106: load_kernel (env);
107: }
108:
109: static void
1.1.1.2 ! root 110: mips_mipssim_init (ram_addr_t ram_size, int vga_ram_size,
! 111: const char *boot_device,
1.1 root 112: const char *kernel_filename, const char *kernel_cmdline,
113: const char *initrd_filename, const char *cpu_model)
114: {
115: char buf[1024];
116: unsigned long bios_offset;
117: CPUState *env;
118: int bios_size;
119:
120: /* Init CPUs. */
121: if (cpu_model == NULL) {
122: #ifdef TARGET_MIPS64
123: cpu_model = "5Kf";
124: #else
125: cpu_model = "24Kf";
126: #endif
127: }
128: env = cpu_init(cpu_model);
129: if (!env) {
130: fprintf(stderr, "Unable to find CPU definition\n");
131: exit(1);
132: }
133: qemu_register_reset(main_cpu_reset, env);
134:
135: /* Allocate RAM. */
136: cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
137:
138: /* Load a BIOS / boot exception handler image. */
139: bios_offset = ram_size + vga_ram_size;
140: if (bios_name == NULL)
141: bios_name = BIOS_FILENAME;
142: snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
143: bios_size = load_image(buf, phys_ram_base + bios_offset);
144: if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
145: /* Bail out if we have neither a kernel image nor boot vector code. */
146: fprintf(stderr,
147: "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
148: buf);
149: exit(1);
150: } else {
151: /* Map the BIOS / boot exception handler. */
152: cpu_register_physical_memory(0x1fc00000LL,
153: bios_size, bios_offset | IO_MEM_ROM);
154: /* We have a boot vector start address. */
1.1.1.2 ! root 155: env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
1.1 root 156: }
157:
158: if (kernel_filename) {
159: loaderparams.ram_size = ram_size;
160: loaderparams.kernel_filename = kernel_filename;
161: loaderparams.kernel_cmdline = kernel_cmdline;
162: loaderparams.initrd_filename = initrd_filename;
163: load_kernel(env);
164: }
165:
166: /* Init CPU internal devices. */
167: cpu_mips_irq_init_cpu(env);
168: cpu_mips_clock_init(env);
169:
170: /* Register 64 KB of ISA IO space at 0x1fd00000. */
171: isa_mmio_init(0x1fd00000, 0x00010000);
172:
173: /* A single 16450 sits at offset 0x3f8. It is attached to
174: MIPS CPU INT2, which is interrupt 4. */
175: if (serial_hds[0])
1.1.1.2 ! root 176: serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
1.1 root 177:
1.1.1.2 ! root 178: if (nd_table[0].vlan)
! 179: /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
! 180: mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
1.1 root 181: }
182:
183: QEMUMachine mips_mipssim_machine = {
1.1.1.2 ! root 184: .name = "mipssim",
! 185: .desc = "MIPS MIPSsim platform",
! 186: .init = mips_mipssim_init,
! 187: .ram_require = BIOS_SIZE + VGA_RAM_SIZE /* unused */,
! 188: .nodisk_ok = 1,
1.1 root 189: };
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