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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(X86MachineState *x86ms,
147 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 bool multiboot_dma_enabled = X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled;
156 int i, is_multiboot = 0;
157 uint32_t flags = 0;
158 uint32_t mh_entry_addr;
159 uint32_t mh_load_addr;
160 uint32_t mb_kernel_size;
161 MultibootState mbs;
162 uint8_t bootinfo[MBI_SIZE];
163 uint8_t *mb_bootinfo_data;
164 uint32_t cmdline_len;
165 GList *mods = NULL;
166
167
168
169 for (i = 0; i < (8192 - 48); i += 4) {
170 if (ldl_p(header+i) == 0x1BADB002) {
171 uint32_t checksum = ldl_p(header+i+8);
172 flags = ldl_p(header+i+4);
173 checksum += flags;
174 checksum += (uint32_t)0x1BADB002;
175 if (!checksum) {
176 is_multiboot = 1;
177 break;
178 }
179 }
180 }
181
182 if (!is_multiboot)
183 return 0;
184
185 mb_debug("I believe we found a multiboot image!");
186 memset(bootinfo, 0, sizeof(bootinfo));
187 memset(&mbs, 0, sizeof(mbs));
188
189 if (flags & 0x00000004) {
190 error_report("multiboot knows VBE. we don't");
191 }
192 if (!(flags & 0x00010000)) {
193 uint64_t elf_entry;
194 uint64_t elf_low, elf_high;
195 int kernel_size;
196 fclose(f);
197
198 if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
199 error_report("Cannot load x86-64 image, give a 32bit one.");
200 exit(1);
201 }
202
203 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry,
204 &elf_low, &elf_high, NULL, 0, I386_ELF_MACHINE,
205 0, 0);
206 if (kernel_size < 0) {
207 error_report("Error while loading elf kernel");
208 exit(1);
209 }
210 mh_load_addr = elf_low;
211 mb_kernel_size = elf_high - elf_low;
212 mh_entry_addr = elf_entry;
213
214 mbs.mb_buf = g_malloc(mb_kernel_size);
215 if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
216 error_report("Error while fetching elf kernel from rom");
217 exit(1);
218 }
219
220 mb_debug("loading multiboot-elf kernel "
221 "(%#x bytes) with entry %#zx",
222 mb_kernel_size, (size_t)mh_entry_addr);
223 } else {
224
225 uint32_t mh_header_addr = ldl_p(header+i+12);
226 uint32_t mh_load_end_addr = ldl_p(header+i+20);
227 uint32_t mh_bss_end_addr = ldl_p(header+i+24);
228
229 mh_load_addr = ldl_p(header+i+16);
230 if (mh_header_addr < mh_load_addr) {
231 error_report("invalid load_addr address");
232 exit(1);
233 }
234 if (mh_header_addr - mh_load_addr > i) {
235 error_report("invalid header_addr address");
236 exit(1);
237 }
238
239 uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
240 uint32_t mb_load_size = 0;
241 mh_entry_addr = ldl_p(header+i+28);
242
243 if (mh_load_end_addr) {
244 if (mh_load_end_addr < mh_load_addr) {
245 error_report("invalid load_end_addr address");
246 exit(1);
247 }
248 mb_load_size = mh_load_end_addr - mh_load_addr;
249 } else {
250 if (kernel_file_size < mb_kernel_text_offset) {
251 error_report("invalid kernel_file_size");
252 exit(1);
253 }
254 mb_load_size = kernel_file_size - mb_kernel_text_offset;
255 }
256 if (mb_load_size > UINT32_MAX - mh_load_addr) {
257 error_report("kernel does not fit in address space");
258 exit(1);
259 }
260 if (mh_bss_end_addr) {
261 if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) {
262 error_report("invalid bss_end_addr address");
263 exit(1);
264 }
265 mb_kernel_size = mh_bss_end_addr - mh_load_addr;
266 } else {
267 mb_kernel_size = mb_load_size;
268 }
269
270 mb_debug("multiboot: header_addr = %#x", mh_header_addr);
271 mb_debug("multiboot: load_addr = %#x", mh_load_addr);
272 mb_debug("multiboot: load_end_addr = %#x", mh_load_end_addr);
273 mb_debug("multiboot: bss_end_addr = %#x", mh_bss_end_addr);
274 mb_debug("loading multiboot kernel (%#x bytes) at %#x",
275 mb_load_size, mh_load_addr);
276
277 mbs.mb_buf = g_malloc(mb_kernel_size);
278 fseek(f, mb_kernel_text_offset, SEEK_SET);
279 if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) {
280 error_report("fread() failed");
281 exit(1);
282 }
283 memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size);
284 fclose(f);
285 }
286
287 mbs.mb_buf_phys = mh_load_addr;
288
289 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
290 mbs.offset_mbinfo = mbs.mb_buf_size;
291
292
293 cmdline_len = strlen(kernel_filename) + 1;
294 cmdline_len += strlen(kernel_cmdline) + 1;
295 if (initrd_filename) {
296 const char *r = initrd_filename;
297 cmdline_len += strlen(initrd_filename) + 1;
298 while (*r) {
299 char *value;
300 r = get_opt_value(r, &value);
301 mbs.mb_mods_avail++;
302 mods = g_list_append(mods, value);
303 if (*r) {
304 r++;
305 }
306 }
307 }
308
309 mbs.mb_buf_size += cmdline_len;
310 mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
311 mbs.mb_buf_size += strlen(bootloader_name) + 1;
312
313 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
314
315
316 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
317 mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
318 mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
319
320 if (mods) {
321 GList *tmpl = mods;
322 mbs.offset_mods = mbs.mb_buf_size;
323
324 while (tmpl) {
325 char *next_space;
326 int mb_mod_length;
327 uint32_t offs = mbs.mb_buf_size;
328 char *one_file = tmpl->data;
329
330
331
332 hwaddr c = mb_add_cmdline(&mbs, one_file);
333 next_space = strchr(one_file, ' ');
334 if (next_space) {
335 *next_space = '\0';
336 }
337 mb_debug("multiboot loading module: %s", one_file);
338 mb_mod_length = get_image_size(one_file);
339 if (mb_mod_length < 0) {
340 error_report("Failed to open file '%s'", one_file);
341 exit(1);
342 }
343
344 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
345 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
346
347 if (load_image_size(one_file, (unsigned char *)mbs.mb_buf + offs,
348 mbs.mb_buf_size - offs) < 0) {
349 error_report("Error loading file '%s'", one_file);
350 exit(1);
351 }
352 mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
353 mbs.mb_buf_phys + offs + mb_mod_length, c);
354
355 mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx,
356 (char *)mbs.mb_buf + offs,
357 (char *)mbs.mb_buf + offs + mb_mod_length, c);
358 g_free(one_file);
359 tmpl = tmpl->next;
360 }
361 g_list_free(mods);
362 }
363
364
365 char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
366 snprintf(kcmdline, sizeof(kcmdline), "%s %s",
367 kernel_filename, kernel_cmdline);
368 stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
369
370 stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));
371
372 stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
373 stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count);
374
375
376 stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
377 | MULTIBOOT_FLAGS_BOOT_DEVICE
378 | MULTIBOOT_FLAGS_CMDLINE
379 | MULTIBOOT_FLAGS_MODULES
380 | MULTIBOOT_FLAGS_MMAP
381 | MULTIBOOT_FLAGS_BOOTLOADER);
382 stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff);
383 stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
384
385 mb_debug("multiboot: entry_addr = %#x", mh_entry_addr);
386 mb_debug(" mb_buf_phys = "TARGET_FMT_plx, mbs.mb_buf_phys);
387 mb_debug(" mod_start = "TARGET_FMT_plx,
388 mbs.mb_buf_phys + mbs.offset_mods);
389 mb_debug(" mb_mods_count = %d", mbs.mb_mods_count);
390
391
392 mb_bootinfo_data = g_memdup(bootinfo, sizeof(bootinfo));
393
394
395 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
396 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
397 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
398 fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
399 mbs.mb_buf, mbs.mb_buf_size);
400
401 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
402 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
403 fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
404 sizeof(bootinfo));
405
406 if (multiboot_dma_enabled) {
407 option_rom[nb_option_roms].name = "multiboot_dma.bin";
408 } else {
409 option_rom[nb_option_roms].name = "multiboot.bin";
410 }
411 option_rom[nb_option_roms].bootindex = 0;
412 nb_option_roms++;
413
414 return 1;
415}
416
