1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25#include "qemu/osdep.h"
26#include "qemu-common.h"
27#include "cpu.h"
28#include "hw/hw.h"
29#include "hw/nvram/fw_cfg.h"
30#include "multiboot.h"
31#include "hw/loader.h"
32#include "elf.h"
33#include "sysemu/sysemu.h"
34
35
36
37
38#ifdef DEBUG_MULTIBOOT
39#define mb_debug(a...) fprintf(stderr, ## a)
40#else
41#define mb_debug(a...)
42#endif
43
44#define MULTIBOOT_STRUCT_ADDR 0x9000
45
46#if MULTIBOOT_STRUCT_ADDR > 0xf0000
47#error multiboot struct needs to fit in 16 bit real mode
48#endif
49
50enum {
51
52 MBI_FLAGS = 0,
53 MBI_MEM_LOWER = 4,
54 MBI_MEM_UPPER = 8,
55 MBI_BOOT_DEVICE = 12,
56 MBI_CMDLINE = 16,
57 MBI_MODS_COUNT = 20,
58 MBI_MODS_ADDR = 24,
59 MBI_MMAP_ADDR = 48,
60 MBI_BOOTLOADER = 64,
61
62 MBI_SIZE = 88,
63
64
65 MB_MOD_START = 0,
66 MB_MOD_END = 4,
67 MB_MOD_CMDLINE = 8,
68
69 MB_MOD_SIZE = 16,
70
71
72 ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0,
73 ADDR_MBI = ADDR_E820_MAP + 0x500,
74
75
76 MULTIBOOT_FLAGS_MEMORY = 1 << 0,
77 MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1,
78 MULTIBOOT_FLAGS_CMDLINE = 1 << 2,
79 MULTIBOOT_FLAGS_MODULES = 1 << 3,
80 MULTIBOOT_FLAGS_MMAP = 1 << 6,
81 MULTIBOOT_FLAGS_BOOTLOADER = 1 << 9,
82};
83
84typedef struct {
85
86 void *mb_buf;
87
88 hwaddr mb_buf_phys;
89
90 unsigned mb_buf_size;
91
92 hwaddr offset_mbinfo;
93
94 hwaddr offset_cmdlines;
95
96 hwaddr offset_bootloader;
97
98 hwaddr offset_mods;
99
100 int mb_mods_avail;
101
102 int mb_mods_count;
103} MultibootState;
104
105const char *bootloader_name = "qemu";
106
107static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline)
108{
109 hwaddr p = s->offset_cmdlines;
110 char *b = (char *)s->mb_buf + p;
111
112 get_opt_value(b, strlen(cmdline) + 1, cmdline);
113 s->offset_cmdlines += strlen(b) + 1;
114 return s->mb_buf_phys + p;
115}
116
117static uint32_t mb_add_bootloader(MultibootState *s, const char *bootloader)
118{
119 hwaddr p = s->offset_bootloader;
120 char *b = (char *)s->mb_buf + p;
121
122 memcpy(b, bootloader, strlen(bootloader) + 1);
123 s->offset_bootloader += strlen(b) + 1;
124 return s->mb_buf_phys + p;
125}
126
127static void mb_add_mod(MultibootState *s,
128 hwaddr start, hwaddr end,
129 hwaddr cmdline_phys)
130{
131 char *p;
132 assert(s->mb_mods_count < s->mb_mods_avail);
133
134 p = (char *)s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE * s->mb_mods_count;
135
136 stl_p(p + MB_MOD_START, start);
137 stl_p(p + MB_MOD_END, end);
138 stl_p(p + MB_MOD_CMDLINE, cmdline_phys);
139
140 mb_debug("mod%02d: "TARGET_FMT_plx" - "TARGET_FMT_plx"\n",
141 s->mb_mods_count, start, end);
142
143 s->mb_mods_count++;
144}
145
146int load_multiboot(FWCfgState *fw_cfg,
147 FILE *f,
148 const char *kernel_filename,
149 const char *initrd_filename,
150 const char *kernel_cmdline,
151 int kernel_file_size,
152 uint8_t *header)
153{
154 int i, is_multiboot = 0;
155 uint32_t flags = 0;
156 uint32_t mh_entry_addr;
157 uint32_t mh_load_addr;
158 uint32_t mb_kernel_size;
159 MultibootState mbs;
160 uint8_t bootinfo[MBI_SIZE];
161 uint8_t *mb_bootinfo_data;
162 uint32_t cmdline_len;
163
164
165
166 for (i = 0; i < (8192 - 48); i += 4) {
167 if (ldl_p(header+i) == 0x1BADB002) {
168 uint32_t checksum = ldl_p(header+i+8);
169 flags = ldl_p(header+i+4);
170 checksum += flags;
171 checksum += (uint32_t)0x1BADB002;
172 if (!checksum) {
173 is_multiboot = 1;
174 break;
175 }
176 }
177 }
178
179 if (!is_multiboot)
180 return 0;
181
182 mb_debug("qemu: I believe we found a multiboot image!\n");
183 memset(bootinfo, 0, sizeof(bootinfo));
184 memset(&mbs, 0, sizeof(mbs));
185
186 if (flags & 0x00000004) {
187 fprintf(stderr, "qemu: multiboot knows VBE. we don't.\n");
188 }
189 if (!(flags & 0x00010000)) {
190 uint64_t elf_entry;
191 uint64_t elf_low, elf_high;
192 int kernel_size;
193 fclose(f);
194
195 if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
196 fprintf(stderr, "Cannot load x86-64 image, give a 32bit one.\n");
197 exit(1);
198 }
199
200 kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
201 &elf_low, &elf_high, 0, I386_ELF_MACHINE,
202 0, 0);
203 if (kernel_size < 0) {
204 fprintf(stderr, "Error while loading elf kernel\n");
205 exit(1);
206 }
207 mh_load_addr = elf_low;
208 mb_kernel_size = elf_high - elf_low;
209 mh_entry_addr = elf_entry;
210
211 mbs.mb_buf = g_malloc(mb_kernel_size);
212 if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
213 fprintf(stderr, "Error while fetching elf kernel from rom\n");
214 exit(1);
215 }
216
217 mb_debug("qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n",
218 mb_kernel_size, (size_t)mh_entry_addr);
219 } else {
220
221 uint32_t mh_header_addr = ldl_p(header+i+12);
222 uint32_t mh_load_end_addr = ldl_p(header+i+20);
223 uint32_t mh_bss_end_addr = ldl_p(header+i+24);
224 mh_load_addr = ldl_p(header+i+16);
225 uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
226 uint32_t mb_load_size = 0;
227 mh_entry_addr = ldl_p(header+i+28);
228
229 if (mh_load_end_addr) {
230 mb_kernel_size = mh_bss_end_addr - mh_load_addr;
231 mb_load_size = mh_load_end_addr - mh_load_addr;
232 } else {
233 mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
234 mb_load_size = mb_kernel_size;
235 }
236
237
238
239
240
241
242
243 mb_debug("multiboot: mh_header_addr = %#x\n", mh_header_addr);
244 mb_debug("multiboot: mh_load_addr = %#x\n", mh_load_addr);
245 mb_debug("multiboot: mh_load_end_addr = %#x\n", mh_load_end_addr);
246 mb_debug("multiboot: mh_bss_end_addr = %#x\n", mh_bss_end_addr);
247 mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n",
248 mb_load_size, mh_load_addr);
249
250 mbs.mb_buf = g_malloc(mb_kernel_size);
251 fseek(f, mb_kernel_text_offset, SEEK_SET);
252 if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) {
253 fprintf(stderr, "fread() failed\n");
254 exit(1);
255 }
256 memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size);
257 fclose(f);
258 }
259
260 mbs.mb_buf_phys = mh_load_addr;
261
262 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
263 mbs.offset_mbinfo = mbs.mb_buf_size;
264
265
266 cmdline_len = strlen(kernel_filename) + 1;
267 cmdline_len += strlen(kernel_cmdline) + 1;
268 if (initrd_filename) {
269 const char *r = initrd_filename;
270 cmdline_len += strlen(r) + 1;
271 mbs.mb_mods_avail = 1;
272 while (*(r = get_opt_value(NULL, 0, r))) {
273 mbs.mb_mods_avail++;
274 r++;
275 }
276 }
277
278 mbs.mb_buf_size += cmdline_len;
279 mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
280 mbs.mb_buf_size += strlen(bootloader_name) + 1;
281
282 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
283
284
285 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
286 mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
287 mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
288
289 if (initrd_filename) {
290 char *next_initrd, not_last;
291
292 mbs.offset_mods = mbs.mb_buf_size;
293
294 do {
295 char *next_space;
296 int mb_mod_length;
297 uint32_t offs = mbs.mb_buf_size;
298
299 next_initrd = (char *)get_opt_value(NULL, 0, initrd_filename);
300 not_last = *next_initrd;
301 *next_initrd = '\0';
302
303
304 hwaddr c = mb_add_cmdline(&mbs, initrd_filename);
305 if ((next_space = strchr(initrd_filename, ' ')))
306 *next_space = '\0';
307 mb_debug("multiboot loading module: %s\n", initrd_filename);
308 mb_mod_length = get_image_size(initrd_filename);
309 if (mb_mod_length < 0) {
310 fprintf(stderr, "Failed to open file '%s'\n", initrd_filename);
311 exit(1);
312 }
313
314 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
315 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
316
317 load_image(initrd_filename, (unsigned char *)mbs.mb_buf + offs);
318 mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
319 mbs.mb_buf_phys + offs + mb_mod_length, c);
320
321 mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx"\n",
322 (char *)mbs.mb_buf + offs,
323 (char *)mbs.mb_buf + offs + mb_mod_length, c);
324 initrd_filename = next_initrd+1;
325 } while (not_last);
326 }
327
328
329 char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
330 snprintf(kcmdline, sizeof(kcmdline), "%s %s",
331 kernel_filename, kernel_cmdline);
332 stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
333
334 stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));
335
336 stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
337 stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count);
338
339
340 stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
341 | MULTIBOOT_FLAGS_BOOT_DEVICE
342 | MULTIBOOT_FLAGS_CMDLINE
343 | MULTIBOOT_FLAGS_MODULES
344 | MULTIBOOT_FLAGS_MMAP
345 | MULTIBOOT_FLAGS_BOOTLOADER);
346 stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff);
347 stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
348
349 mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
350 mb_debug(" mb_buf_phys = "TARGET_FMT_plx"\n", mbs.mb_buf_phys);
351 mb_debug(" mod_start = "TARGET_FMT_plx"\n", mbs.mb_buf_phys + mbs.offset_mods);
352 mb_debug(" mb_mods_count = %d\n", mbs.mb_mods_count);
353
354
355 mb_bootinfo_data = g_malloc(sizeof(bootinfo));
356 memcpy(mb_bootinfo_data, bootinfo, sizeof(bootinfo));
357
358
359 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
360 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
361 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
362 fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
363 mbs.mb_buf, mbs.mb_buf_size);
364
365 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
366 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
367 fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
368 sizeof(bootinfo));
369
370 option_rom[nb_option_roms].name = "multiboot.bin";
371 option_rom[nb_option_roms].bootindex = 0;
372 nb_option_roms++;
373
374 return 1;
375}
376
