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25#include "qemu/osdep.h"
26#include "qemu/option.h"
27#include "cpu.h"
28#include "hw/nvram/fw_cfg.h"
29#include "multiboot.h"
30#include "hw/loader.h"
31#include "elf.h"
32#include "sysemu/sysemu.h"
33#include "qemu/error-report.h"
34
35
36
37
38#ifdef DEBUG_MULTIBOOT
39#define mb_debug(a...) error_report(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 memcpy(b, cmdline, strlen(cmdline) + 1);
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,
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 GList *mods = NULL;
164
165
166
167 for (i = 0; i < (8192 - 48); i += 4) {
168 if (ldl_p(header+i) == 0x1BADB002) {
169 uint32_t checksum = ldl_p(header+i+8);
170 flags = ldl_p(header+i+4);
171 checksum += flags;
172 checksum += (uint32_t)0x1BADB002;
173 if (!checksum) {
174 is_multiboot = 1;
175 break;
176 }
177 }
178 }
179
180 if (!is_multiboot)
181 return 0;
182
183 mb_debug("I believe we found a multiboot image!");
184 memset(bootinfo, 0, sizeof(bootinfo));
185 memset(&mbs, 0, sizeof(mbs));
186
187 if (flags & 0x00000004) {
188 error_report("multiboot knows VBE. we don't");
189 }
190 if (!(flags & 0x00010000)) {
191 uint64_t elf_entry;
192 uint64_t elf_low, elf_high;
193 int kernel_size;
194 fclose(f);
195
196 if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
197 error_report("Cannot load x86-64 image, give a 32bit one.");
198 exit(1);
199 }
200
201 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry,
202 &elf_low, &elf_high, NULL, 0, I386_ELF_MACHINE,
203 0, 0);
204 if (kernel_size < 0) {
205 error_report("Error while loading elf kernel");
206 exit(1);
207 }
208 mh_load_addr = elf_low;
209 mb_kernel_size = elf_high - elf_low;
210 mh_entry_addr = elf_entry;
211
212 mbs.mb_buf = g_malloc(mb_kernel_size);
213 if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
214 error_report("Error while fetching elf kernel from rom");
215 exit(1);
216 }
217
218 mb_debug("loading multiboot-elf kernel "
219 "(%#x bytes) with entry %#zx",
220 mb_kernel_size, (size_t)mh_entry_addr);
221 } else {
222
223 uint32_t mh_header_addr = ldl_p(header+i+12);
224 uint32_t mh_load_end_addr = ldl_p(header+i+20);
225 uint32_t mh_bss_end_addr = ldl_p(header+i+24);
226
227 mh_load_addr = ldl_p(header+i+16);
228 if (mh_header_addr < mh_load_addr) {
229 error_report("invalid load_addr address");
230 exit(1);
231 }
232 if (mh_header_addr - mh_load_addr > i) {
233 error_report("invalid header_addr address");
234 exit(1);
235 }
236
237 uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
238 uint32_t mb_load_size = 0;
239 mh_entry_addr = ldl_p(header+i+28);
240
241 if (mh_load_end_addr) {
242 if (mh_load_end_addr < mh_load_addr) {
243 error_report("invalid load_end_addr address");
244 exit(1);
245 }
246 mb_load_size = mh_load_end_addr - mh_load_addr;
247 } else {
248 if (kernel_file_size < mb_kernel_text_offset) {
249 error_report("invalid kernel_file_size");
250 exit(1);
251 }
252 mb_load_size = kernel_file_size - mb_kernel_text_offset;
253 }
254 if (mb_load_size > UINT32_MAX - mh_load_addr) {
255 error_report("kernel does not fit in address space");
256 exit(1);
257 }
258 if (mh_bss_end_addr) {
259 if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) {
260 error_report("invalid bss_end_addr address");
261 exit(1);
262 }
263 mb_kernel_size = mh_bss_end_addr - mh_load_addr;
264 } else {
265 mb_kernel_size = mb_load_size;
266 }
267
268 mb_debug("multiboot: header_addr = %#x", mh_header_addr);
269 mb_debug("multiboot: load_addr = %#x", mh_load_addr);
270 mb_debug("multiboot: load_end_addr = %#x", mh_load_end_addr);
271 mb_debug("multiboot: bss_end_addr = %#x", mh_bss_end_addr);
272 mb_debug("loading multiboot kernel (%#x bytes) at %#x",
273 mb_load_size, mh_load_addr);
274
275 mbs.mb_buf = g_malloc(mb_kernel_size);
276 fseek(f, mb_kernel_text_offset, SEEK_SET);
277 if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) {
278 error_report("fread() failed");
279 exit(1);
280 }
281 memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size);
282 fclose(f);
283 }
284
285 mbs.mb_buf_phys = mh_load_addr;
286
287 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
288 mbs.offset_mbinfo = mbs.mb_buf_size;
289
290
291 cmdline_len = strlen(kernel_filename) + 1;
292 cmdline_len += strlen(kernel_cmdline) + 1;
293 if (initrd_filename) {
294 const char *r = initrd_filename;
295 cmdline_len += strlen(initrd_filename) + 1;
296 while (*r) {
297 char *value;
298 r = get_opt_value(r, &value);
299 mbs.mb_mods_avail++;
300 mods = g_list_append(mods, value);
301 if (*r) {
302 r++;
303 }
304 }
305 }
306
307 mbs.mb_buf_size += cmdline_len;
308 mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
309 mbs.mb_buf_size += strlen(bootloader_name) + 1;
310
311 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
312
313
314 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
315 mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
316 mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
317
318 if (mods) {
319 GList *tmpl = mods;
320 mbs.offset_mods = mbs.mb_buf_size;
321
322 while (tmpl) {
323 char *next_space;
324 int mb_mod_length;
325 uint32_t offs = mbs.mb_buf_size;
326 char *one_file = tmpl->data;
327
328
329
330 hwaddr c = mb_add_cmdline(&mbs, one_file);
331 next_space = strchr(one_file, ' ');
332 if (next_space) {
333 *next_space = '\0';
334 }
335 mb_debug("multiboot loading module: %s", one_file);
336 mb_mod_length = get_image_size(one_file);
337 if (mb_mod_length < 0) {
338 error_report("Failed to open file '%s'", one_file);
339 exit(1);
340 }
341
342 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
343 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
344
345 if (load_image_size(one_file, (unsigned char *)mbs.mb_buf + offs,
346 mbs.mb_buf_size - offs) < 0) {
347 error_report("Error loading file '%s'", one_file);
348 exit(1);
349 }
350 mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
351 mbs.mb_buf_phys + offs + mb_mod_length, c);
352
353 mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx,
354 (char *)mbs.mb_buf + offs,
355 (char *)mbs.mb_buf + offs + mb_mod_length, c);
356 g_free(one_file);
357 tmpl = tmpl->next;
358 }
359 g_list_free(mods);
360 }
361
362
363 char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
364 snprintf(kcmdline, sizeof(kcmdline), "%s %s",
365 kernel_filename, kernel_cmdline);
366 stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
367
368 stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));
369
370 stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
371 stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count);
372
373
374 stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
375 | MULTIBOOT_FLAGS_BOOT_DEVICE
376 | MULTIBOOT_FLAGS_CMDLINE
377 | MULTIBOOT_FLAGS_MODULES
378 | MULTIBOOT_FLAGS_MMAP
379 | MULTIBOOT_FLAGS_BOOTLOADER);
380 stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff);
381 stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
382
383 mb_debug("multiboot: entry_addr = %#x", mh_entry_addr);
384 mb_debug(" mb_buf_phys = "TARGET_FMT_plx, mbs.mb_buf_phys);
385 mb_debug(" mod_start = "TARGET_FMT_plx,
386 mbs.mb_buf_phys + mbs.offset_mods);
387 mb_debug(" mb_mods_count = %d", mbs.mb_mods_count);
388
389
390 mb_bootinfo_data = g_memdup(bootinfo, sizeof(bootinfo));
391
392
393 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
394 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
395 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
396 fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
397 mbs.mb_buf, mbs.mb_buf_size);
398
399 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
400 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
401 fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
402 sizeof(bootinfo));
403
404 option_rom[nb_option_roms].name = "multiboot.bin";
405 option_rom[nb_option_roms].bootindex = 0;
406 nb_option_roms++;
407
408 return 1;
409}
410
