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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
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("qemu: 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("qemu: 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, &elf_entry,
202 &elf_low, &elf_high, 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("qemu: 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("qemu: 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(r) + 1;
296 mbs.mb_mods_avail = 1;
297 while (*(r = get_opt_value(NULL, 0, r))) {
298 mbs.mb_mods_avail++;
299 r++;
300 }
301 }
302
303 mbs.mb_buf_size += cmdline_len;
304 mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
305 mbs.mb_buf_size += strlen(bootloader_name) + 1;
306
307 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
308
309
310 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
311 mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
312 mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
313
314 if (initrd_filename) {
315 const char *next_initrd;
316 char not_last, tmpbuf[strlen(initrd_filename) + 1];
317
318 mbs.offset_mods = mbs.mb_buf_size;
319
320 do {
321 char *next_space;
322 int mb_mod_length;
323 uint32_t offs = mbs.mb_buf_size;
324
325 next_initrd = get_opt_value(tmpbuf, sizeof(tmpbuf), initrd_filename);
326 not_last = *next_initrd;
327
328
329 hwaddr c = mb_add_cmdline(&mbs, tmpbuf);
330 if ((next_space = strchr(tmpbuf, ' ')))
331 *next_space = '\0';
332 mb_debug("multiboot loading module: %s", tmpbuf);
333 mb_mod_length = get_image_size(tmpbuf);
334 if (mb_mod_length < 0) {
335 error_report("Failed to open file '%s'", tmpbuf);
336 exit(1);
337 }
338
339 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
340 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
341
342 load_image(tmpbuf, (unsigned char *)mbs.mb_buf + offs);
343 mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
344 mbs.mb_buf_phys + offs + mb_mod_length, c);
345
346 mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx,
347 (char *)mbs.mb_buf + offs,
348 (char *)mbs.mb_buf + offs + mb_mod_length, c);
349 initrd_filename = next_initrd+1;
350 } while (not_last);
351 }
352
353
354 char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
355 snprintf(kcmdline, sizeof(kcmdline), "%s %s",
356 kernel_filename, kernel_cmdline);
357 stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
358
359 stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));
360
361 stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
362 stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count);
363
364
365 stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
366 | MULTIBOOT_FLAGS_BOOT_DEVICE
367 | MULTIBOOT_FLAGS_CMDLINE
368 | MULTIBOOT_FLAGS_MODULES
369 | MULTIBOOT_FLAGS_MMAP
370 | MULTIBOOT_FLAGS_BOOTLOADER);
371 stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff);
372 stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
373
374 mb_debug("multiboot: entry_addr = %#x", mh_entry_addr);
375 mb_debug(" mb_buf_phys = "TARGET_FMT_plx, mbs.mb_buf_phys);
376 mb_debug(" mod_start = "TARGET_FMT_plx,
377 mbs.mb_buf_phys + mbs.offset_mods);
378 mb_debug(" mb_mods_count = %d", mbs.mb_mods_count);
379
380
381 mb_bootinfo_data = g_memdup(bootinfo, sizeof(bootinfo));
382
383
384 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
385 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
386 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
387 fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
388 mbs.mb_buf, mbs.mb_buf_size);
389
390 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
391 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
392 fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
393 sizeof(bootinfo));
394
395 option_rom[nb_option_roms].name = "multiboot.bin";
396 option_rom[nb_option_roms].bootindex = 0;
397 nb_option_roms++;
398
399 return 1;
400}
401
