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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"
1.1.1.3 root 34: #include "mips-bios.h"
1.1.1.4 ! root 35: #include "loader.h"
! 36: #include "elf.h"
1.1 root 37:
38: #ifdef TARGET_MIPS64
39: #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
40: #else
41: #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
42: #endif
43:
44: #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
45:
46: static struct _loaderparams {
47: int ram_size;
48: const char *kernel_filename;
49: const char *kernel_cmdline;
50: const char *initrd_filename;
51: } loaderparams;
52:
1.1.1.4 ! root 53: typedef struct ResetData {
! 54: CPUState *env;
! 55: uint64_t vector;
! 56: } ResetData;
! 57:
! 58: static int64_t load_kernel(void)
1.1 root 59: {
60: int64_t entry, kernel_low, kernel_high;
61: long kernel_size;
62: long initrd_size;
63: ram_addr_t initrd_offset;
1.1.1.4 ! root 64: int big_endian;
! 65:
! 66: #ifdef TARGET_WORDS_BIGENDIAN
! 67: big_endian = 1;
! 68: #else
! 69: big_endian = 0;
! 70: #endif
1.1 root 71:
72: kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
1.1.1.2 root 73: (uint64_t *)&entry, (uint64_t *)&kernel_low,
1.1.1.4 ! root 74: (uint64_t *)&kernel_high, big_endian, ELF_MACHINE, 1);
1.1 root 75: if (kernel_size >= 0) {
76: if ((entry & ~0x7fffffffULL) == 0x80000000)
77: entry = (int32_t)entry;
78: } else {
79: fprintf(stderr, "qemu: could not load kernel '%s'\n",
80: loaderparams.kernel_filename);
81: exit(1);
82: }
83:
84: /* load initrd */
85: initrd_size = 0;
86: initrd_offset = 0;
87: if (loaderparams.initrd_filename) {
88: initrd_size = get_image_size (loaderparams.initrd_filename);
89: if (initrd_size > 0) {
90: initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
91: if (initrd_offset + initrd_size > loaderparams.ram_size) {
92: fprintf(stderr,
93: "qemu: memory too small for initial ram disk '%s'\n",
94: loaderparams.initrd_filename);
95: exit(1);
96: }
1.1.1.3 root 97: initrd_size = load_image_targphys(loaderparams.initrd_filename,
98: initrd_offset, loaderparams.ram_size - initrd_offset);
1.1 root 99: }
100: if (initrd_size == (target_ulong) -1) {
101: fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
102: loaderparams.initrd_filename);
103: exit(1);
104: }
105: }
1.1.1.4 ! root 106: return entry;
1.1 root 107: }
108:
109: static void main_cpu_reset(void *opaque)
110: {
1.1.1.4 ! root 111: ResetData *s = (ResetData *)opaque;
! 112: CPUState *env = s->env;
1.1 root 113:
1.1.1.4 ! root 114: cpu_reset(env);
! 115: env->active_tc.PC = s->vector;
1.1 root 116: }
117:
118: static void
1.1.1.3 root 119: mips_mipssim_init (ram_addr_t ram_size,
1.1.1.2 root 120: const char *boot_device,
1.1 root 121: const char *kernel_filename, const char *kernel_cmdline,
122: const char *initrd_filename, const char *cpu_model)
123: {
1.1.1.3 root 124: char *filename;
125: ram_addr_t ram_offset;
126: ram_addr_t bios_offset;
1.1 root 127: CPUState *env;
1.1.1.4 ! root 128: ResetData *reset_info;
1.1 root 129: int bios_size;
130:
131: /* Init CPUs. */
132: if (cpu_model == NULL) {
133: #ifdef TARGET_MIPS64
134: cpu_model = "5Kf";
135: #else
136: cpu_model = "24Kf";
137: #endif
138: }
139: env = cpu_init(cpu_model);
140: if (!env) {
141: fprintf(stderr, "Unable to find CPU definition\n");
142: exit(1);
143: }
1.1.1.4 ! root 144: reset_info = qemu_mallocz(sizeof(ResetData));
! 145: reset_info->env = env;
! 146: reset_info->vector = env->active_tc.PC;
! 147: qemu_register_reset(main_cpu_reset, reset_info);
1.1 root 148:
149: /* Allocate RAM. */
1.1.1.3 root 150: ram_offset = qemu_ram_alloc(ram_size);
151: bios_offset = qemu_ram_alloc(BIOS_SIZE);
1.1 root 152:
1.1.1.3 root 153: cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
154:
155: /* Map the BIOS / boot exception handler. */
156: cpu_register_physical_memory(0x1fc00000LL,
157: BIOS_SIZE, bios_offset | IO_MEM_ROM);
1.1 root 158: /* Load a BIOS / boot exception handler image. */
159: if (bios_name == NULL)
160: bios_name = BIOS_FILENAME;
1.1.1.3 root 161: filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
162: if (filename) {
163: bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
164: qemu_free(filename);
165: } else {
166: bios_size = -1;
167: }
1.1 root 168: if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
169: /* Bail out if we have neither a kernel image nor boot vector code. */
170: fprintf(stderr,
171: "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
1.1.1.3 root 172: filename);
1.1 root 173: exit(1);
174: } else {
175: /* We have a boot vector start address. */
1.1.1.2 root 176: env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
1.1 root 177: }
178:
179: if (kernel_filename) {
180: loaderparams.ram_size = ram_size;
181: loaderparams.kernel_filename = kernel_filename;
182: loaderparams.kernel_cmdline = kernel_cmdline;
183: loaderparams.initrd_filename = initrd_filename;
1.1.1.4 ! root 184: reset_info->vector = load_kernel();
1.1 root 185: }
186:
187: /* Init CPU internal devices. */
188: cpu_mips_irq_init_cpu(env);
189: cpu_mips_clock_init(env);
190:
191: /* Register 64 KB of ISA IO space at 0x1fd00000. */
192: isa_mmio_init(0x1fd00000, 0x00010000);
193:
194: /* A single 16450 sits at offset 0x3f8. It is attached to
195: MIPS CPU INT2, which is interrupt 4. */
196: if (serial_hds[0])
1.1.1.2 root 197: serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
1.1 root 198:
1.1.1.2 root 199: if (nd_table[0].vlan)
200: /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
201: mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
1.1 root 202: }
203:
1.1.1.3 root 204: static QEMUMachine mips_mipssim_machine = {
1.1.1.2 root 205: .name = "mipssim",
206: .desc = "MIPS MIPSsim platform",
207: .init = mips_mipssim_init,
1.1 root 208: };
1.1.1.3 root 209:
210: static void mips_mipssim_machine_init(void)
211: {
212: qemu_register_machine(&mips_mipssim_machine);
213: }
214:
215: machine_init(mips_mipssim_machine_init);
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