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25#include "qemu/osdep.h"
26#include "qemu/option.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#include "qemu/error-report.h"
35
36
37
38
39#ifdef DEBUG_MULTIBOOT
40#define mb_debug(a...) error_report(a)
41#else
42#define mb_debug(a...)
43#endif
44
45#define MULTIBOOT_STRUCT_ADDR 0x9000
46
47#if MULTIBOOT_STRUCT_ADDR > 0xf0000
48#error multiboot struct needs to fit in 16 bit real mode
49#endif
50
51enum {
52
53 MBI_FLAGS = 0,
54 MBI_MEM_LOWER = 4,
55 MBI_MEM_UPPER = 8,
56 MBI_BOOT_DEVICE = 12,
57 MBI_CMDLINE = 16,
58 MBI_MODS_COUNT = 20,
59 MBI_MODS_ADDR = 24,
60 MBI_MMAP_ADDR = 48,
61 MBI_BOOTLOADER = 64,
62
63 MBI_SIZE = 88,
64
65
66 MB_MOD_START = 0,
67 MB_MOD_END = 4,
68 MB_MOD_CMDLINE = 8,
69
70 MB_MOD_SIZE = 16,
71
72
73 ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0,
74 ADDR_MBI = ADDR_E820_MAP + 0x500,
75
76
77 MULTIBOOT_FLAGS_MEMORY = 1 << 0,
78 MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1,
79 MULTIBOOT_FLAGS_CMDLINE = 1 << 2,
80 MULTIBOOT_FLAGS_MODULES = 1 << 3,
81 MULTIBOOT_FLAGS_MMAP = 1 << 6,
82 MULTIBOOT_FLAGS_BOOTLOADER = 1 << 9,
83};
84
85typedef struct {
86
87 void *mb_buf;
88
89 hwaddr mb_buf_phys;
90
91 unsigned mb_buf_size;
92
93 hwaddr offset_mbinfo;
94
95 hwaddr offset_cmdlines;
96
97 hwaddr offset_bootloader;
98
99 hwaddr offset_mods;
100
101 int mb_mods_avail;
102
103 int mb_mods_count;
104} MultibootState;
105
106const char *bootloader_name = "qemu";
107
108static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline)
109{
110 hwaddr p = s->offset_cmdlines;
111 char *b = (char *)s->mb_buf + p;
112
113 memcpy(b, cmdline, strlen(cmdline) + 1);
114 s->offset_cmdlines += strlen(b) + 1;
115 return s->mb_buf_phys + p;
116}
117
118static uint32_t mb_add_bootloader(MultibootState *s, const char *bootloader)
119{
120 hwaddr p = s->offset_bootloader;
121 char *b = (char *)s->mb_buf + p;
122
123 memcpy(b, bootloader, strlen(bootloader) + 1);
124 s->offset_bootloader += strlen(b) + 1;
125 return s->mb_buf_phys + p;
126}
127
128static void mb_add_mod(MultibootState *s,
129 hwaddr start, hwaddr end,
130 hwaddr cmdline_phys)
131{
132 char *p;
133 assert(s->mb_mods_count < s->mb_mods_avail);
134
135 p = (char *)s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE * s->mb_mods_count;
136
137 stl_p(p + MB_MOD_START, start);
138 stl_p(p + MB_MOD_END, end);
139 stl_p(p + MB_MOD_CMDLINE, cmdline_phys);
140
141 mb_debug("mod%02d: "TARGET_FMT_plx" - "TARGET_FMT_plx,
142 s->mb_mods_count, start, end);
143
144 s->mb_mods_count++;
145}
146
147int load_multiboot(FWCfgState *fw_cfg,
148 FILE *f,
149 const char *kernel_filename,
150 const char *initrd_filename,
151 const char *kernel_cmdline,
152 int kernel_file_size,
153 uint8_t *header)
154{
155 int i, is_multiboot = 0;
156 uint32_t flags = 0;
157 uint32_t mh_entry_addr;
158 uint32_t mh_load_addr;
159 uint32_t mb_kernel_size;
160 MultibootState mbs;
161 uint8_t bootinfo[MBI_SIZE];
162 uint8_t *mb_bootinfo_data;
163 uint32_t cmdline_len;
164 GList *mods = NULL;
165
166
167
168 for (i = 0; i < (8192 - 48); i += 4) {
169 if (ldl_p(header+i) == 0x1BADB002) {
170 uint32_t checksum = ldl_p(header+i+8);
171 flags = ldl_p(header+i+4);
172 checksum += flags;
173 checksum += (uint32_t)0x1BADB002;
174 if (!checksum) {
175 is_multiboot = 1;
176 break;
177 }
178 }
179 }
180
181 if (!is_multiboot)
182 return 0;
183
184 mb_debug("I believe we found a multiboot image!");
185 memset(bootinfo, 0, sizeof(bootinfo));
186 memset(&mbs, 0, sizeof(mbs));
187
188 if (flags & 0x00000004) {
189 error_report("multiboot knows VBE. we don't");
190 }
191 if (!(flags & 0x00010000)) {
192 uint64_t elf_entry;
193 uint64_t elf_low, elf_high;
194 int kernel_size;
195 fclose(f);
196
197 if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
198 error_report("Cannot load x86-64 image, give a 32bit one.");
199 exit(1);
200 }
201
202 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry,
203 &elf_low, &elf_high, 0, I386_ELF_MACHINE,
204 0, 0);
205 if (kernel_size < 0) {
206 error_report("Error while loading elf kernel");
207 exit(1);
208 }
209 mh_load_addr = elf_low;
210 mb_kernel_size = elf_high - elf_low;
211 mh_entry_addr = elf_entry;
212
213 mbs.mb_buf = g_malloc(mb_kernel_size);
214 if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
215 error_report("Error while fetching elf kernel from rom");
216 exit(1);
217 }
218
219 mb_debug("loading multiboot-elf kernel "
220 "(%#x bytes) with entry %#zx",
221 mb_kernel_size, (size_t)mh_entry_addr);
222 } else {
223
224 uint32_t mh_header_addr = ldl_p(header+i+12);
225 uint32_t mh_load_end_addr = ldl_p(header+i+20);
226 uint32_t mh_bss_end_addr = ldl_p(header+i+24);
227
228 mh_load_addr = ldl_p(header+i+16);
229 if (mh_header_addr < mh_load_addr) {
230 error_report("invalid load_addr address");
231 exit(1);
232 }
233 if (mh_header_addr - mh_load_addr > i) {
234 error_report("invalid header_addr address");
235 exit(1);
236 }
237
238 uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
239 uint32_t mb_load_size = 0;
240 mh_entry_addr = ldl_p(header+i+28);
241
242 if (mh_load_end_addr) {
243 if (mh_load_end_addr < mh_load_addr) {
244 error_report("invalid load_end_addr address");
245 exit(1);
246 }
247 mb_load_size = mh_load_end_addr - mh_load_addr;
248 } else {
249 if (kernel_file_size < mb_kernel_text_offset) {
250 error_report("invalid kernel_file_size");
251 exit(1);
252 }
253 mb_load_size = kernel_file_size - mb_kernel_text_offset;
254 }
255 if (mb_load_size > UINT32_MAX - mh_load_addr) {
256 error_report("kernel does not fit in address space");
257 exit(1);
258 }
259 if (mh_bss_end_addr) {
260 if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) {
261 error_report("invalid bss_end_addr address");
262 exit(1);
263 }
264 mb_kernel_size = mh_bss_end_addr - mh_load_addr;
265 } else {
266 mb_kernel_size = mb_load_size;
267 }
268
269 mb_debug("multiboot: header_addr = %#x", mh_header_addr);
270 mb_debug("multiboot: load_addr = %#x", mh_load_addr);
271 mb_debug("multiboot: load_end_addr = %#x", mh_load_end_addr);
272 mb_debug("multiboot: bss_end_addr = %#x", mh_bss_end_addr);
273 mb_debug("loading multiboot kernel (%#x bytes) at %#x",
274 mb_load_size, mh_load_addr);
275
276 mbs.mb_buf = g_malloc(mb_kernel_size);
277 fseek(f, mb_kernel_text_offset, SEEK_SET);
278 if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) {
279 error_report("fread() failed");
280 exit(1);
281 }
282 memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size);
283 fclose(f);
284 }
285
286 mbs.mb_buf_phys = mh_load_addr;
287
288 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
289 mbs.offset_mbinfo = mbs.mb_buf_size;
290
291
292 cmdline_len = strlen(kernel_filename) + 1;
293 cmdline_len += strlen(kernel_cmdline) + 1;
294 if (initrd_filename) {
295 const char *r = initrd_filename;
296 cmdline_len += strlen(initrd_filename) + 1;
297 while (*r) {
298 char *value;
299 r = get_opt_value(r, &value);
300 mbs.mb_mods_avail++;
301 mods = g_list_append(mods, value);
302 if (*r) {
303 r++;
304 }
305 }
306 }
307
308 mbs.mb_buf_size += cmdline_len;
309 mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
310 mbs.mb_buf_size += strlen(bootloader_name) + 1;
311
312 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
313
314
315 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
316 mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
317 mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
318
319 if (mods) {
320 GList *tmpl = mods;
321 mbs.offset_mods = mbs.mb_buf_size;
322
323 while (tmpl) {
324 char *next_space;
325 int mb_mod_length;
326 uint32_t offs = mbs.mb_buf_size;
327 char *one_file = tmpl->data;
328
329
330
331 hwaddr c = mb_add_cmdline(&mbs, one_file);
332 next_space = strchr(one_file, ' ');
333 if (next_space) {
334 *next_space = '\0';
335 }
336 mb_debug("multiboot loading module: %s", one_file);
337 mb_mod_length = get_image_size(one_file);
338 if (mb_mod_length < 0) {
339 error_report("Failed to open file '%s'", one_file);
340 exit(1);
341 }
342
343 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
344 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
345
346 if (load_image_size(one_file, (unsigned char *)mbs.mb_buf + offs,
347 mbs.mb_buf_size - offs) < 0) {
348 error_report("Error loading file '%s'", one_file);
349 exit(1);
350 }
351 mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
352 mbs.mb_buf_phys + offs + mb_mod_length, c);
353
354 mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx,
355 (char *)mbs.mb_buf + offs,
356 (char *)mbs.mb_buf + offs + mb_mod_length, c);
357 g_free(one_file);
358 tmpl = tmpl->next;
359 }
360 g_list_free(mods);
361 }
362
363
364 char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
365 snprintf(kcmdline, sizeof(kcmdline), "%s %s",
366 kernel_filename, kernel_cmdline);
367 stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
368
369 stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));
370
371 stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
372 stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count);
373
374
375 stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
376 | MULTIBOOT_FLAGS_BOOT_DEVICE
377 | MULTIBOOT_FLAGS_CMDLINE
378 | MULTIBOOT_FLAGS_MODULES
379 | MULTIBOOT_FLAGS_MMAP
380 | MULTIBOOT_FLAGS_BOOTLOADER);
381 stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff);
382 stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
383
384 mb_debug("multiboot: entry_addr = %#x", mh_entry_addr);
385 mb_debug(" mb_buf_phys = "TARGET_FMT_plx, mbs.mb_buf_phys);
386 mb_debug(" mod_start = "TARGET_FMT_plx,
387 mbs.mb_buf_phys + mbs.offset_mods);
388 mb_debug(" mb_mods_count = %d", mbs.mb_mods_count);
389
390
391 mb_bootinfo_data = g_memdup(bootinfo, sizeof(bootinfo));
392
393
394 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
395 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
396 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
397 fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
398 mbs.mb_buf, mbs.mb_buf_size);
399
400 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
401 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
402 fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
403 sizeof(bootinfo));
404
405 option_rom[nb_option_roms].name = "multiboot.bin";
406 option_rom[nb_option_roms].bootindex = 0;
407 nb_option_roms++;
408
409 return 1;
410}
411
