Bug Summary

File:hw/arm/boot.c
Location:line 137, column 18
Description:Assigned value is garbage or undefined

Annotated Source Code

1/*
2 * ARM kernel loader.
3 *
4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Written by Paul Brook
6 *
7 * This code is licensed under the GPL.
8 */
9
10#include "config.h"
11#include "hw/hw.h"
12#include "hw/arm/arm.h"
13#include "sysemu/sysemu.h"
14#include "hw/boards.h"
15#include "hw/loader.h"
16#include "elf.h"
17#include "sysemu/device_tree.h"
18#include "qemu/config-file.h"
19
20/* Kernel boot protocol is specified in the kernel docs
21 * Documentation/arm/Booting and Documentation/arm64/booting.txt
22 * They have different preferred image load offsets from system RAM base.
23 */
24#define KERNEL_ARGS_ADDR0x100 0x100
25#define KERNEL_LOAD_ADDR0x00010000 0x00010000
26#define KERNEL64_LOAD_ADDR0x00080000 0x00080000
27
28typedef enum {
29 FIXUP_NONE = 0, /* do nothing */
30 FIXUP_TERMINATOR, /* end of insns */
31 FIXUP_BOARDID, /* overwrite with board ID number */
32 FIXUP_ARGPTR, /* overwrite with pointer to kernel args */
33 FIXUP_ENTRYPOINT, /* overwrite with kernel entry point */
34 FIXUP_GIC_CPU_IF, /* overwrite with GIC CPU interface address */
35 FIXUP_BOOTREG, /* overwrite with boot register address */
36 FIXUP_DSB, /* overwrite with correct DSB insn for cpu */
37 FIXUP_MAX,
38} FixupType;
39
40typedef struct ARMInsnFixup {
41 uint32_t insn;
42 FixupType fixup;
43} ARMInsnFixup;
44
45static const ARMInsnFixup bootloader_aarch64[] = {
46 { 0x580000c0 }, /* ldr x0, arg ; Load the lower 32-bits of DTB */
47 { 0xaa1f03e1 }, /* mov x1, xzr */
48 { 0xaa1f03e2 }, /* mov x2, xzr */
49 { 0xaa1f03e3 }, /* mov x3, xzr */
50 { 0x58000084 }, /* ldr x4, entry ; Load the lower 32-bits of kernel entry */
51 { 0xd61f0080 }, /* br x4 ; Jump to the kernel entry point */
52 { 0, FIXUP_ARGPTR }, /* arg: .word @DTB Lower 32-bits */
53 { 0 }, /* .word @DTB Higher 32-bits */
54 { 0, FIXUP_ENTRYPOINT }, /* entry: .word @Kernel Entry Lower 32-bits */
55 { 0 }, /* .word @Kernel Entry Higher 32-bits */
56 { 0, FIXUP_TERMINATOR }
57};
58
59/* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */
60static const ARMInsnFixup bootloader[] = {
61 { 0xe3a00000 }, /* mov r0, #0 */
62 { 0xe59f1004 }, /* ldr r1, [pc, #4] */
63 { 0xe59f2004 }, /* ldr r2, [pc, #4] */
64 { 0xe59ff004 }, /* ldr pc, [pc, #4] */
65 { 0, FIXUP_BOARDID },
66 { 0, FIXUP_ARGPTR },
67 { 0, FIXUP_ENTRYPOINT },
68 { 0, FIXUP_TERMINATOR }
69};
70
71/* Handling for secondary CPU boot in a multicore system.
72 * Unlike the uniprocessor/primary CPU boot, this is platform
73 * dependent. The default code here is based on the secondary
74 * CPU boot protocol used on realview/vexpress boards, with
75 * some parameterisation to increase its flexibility.
76 * QEMU platform models for which this code is not appropriate
77 * should override write_secondary_boot and secondary_cpu_reset_hook
78 * instead.
79 *
80 * This code enables the interrupt controllers for the secondary
81 * CPUs and then puts all the secondary CPUs into a loop waiting
82 * for an interprocessor interrupt and polling a configurable
83 * location for the kernel secondary CPU entry point.
84 */
85#define DSB_INSN0xf57ff04f 0xf57ff04f
86#define CP15_DSB_INSN0xee070f9a 0xee070f9a /* mcr cp15, 0, r0, c7, c10, 4 */
87
88static const ARMInsnFixup smpboot[] = {
89 { 0xe59f2028 }, /* ldr r2, gic_cpu_if */
90 { 0xe59f0028 }, /* ldr r0, bootreg_addr */
91 { 0xe3a01001 }, /* mov r1, #1 */
92 { 0xe5821000 }, /* str r1, [r2] - set GICC_CTLR.Enable */
93 { 0xe3a010ff }, /* mov r1, #0xff */
94 { 0xe5821004 }, /* str r1, [r2, 4] - set GIC_PMR.Priority to 0xff */
95 { 0, FIXUP_DSB }, /* dsb */
96 { 0xe320f003 }, /* wfi */
97 { 0xe5901000 }, /* ldr r1, [r0] */
98 { 0xe1110001 }, /* tst r1, r1 */
99 { 0x0afffffb }, /* beq <wfi> */
100 { 0xe12fff11 }, /* bx r1 */
101 { 0, FIXUP_GIC_CPU_IF }, /* gic_cpu_if: .word 0x.... */
102 { 0, FIXUP_BOOTREG }, /* bootreg_addr: .word 0x.... */
103 { 0, FIXUP_TERMINATOR }
104};
105
106static void write_bootloader(const char *name, hwaddr addr,
107 const ARMInsnFixup *insns, uint32_t *fixupcontext)
108{
109 /* Fix up the specified bootloader fragment and write it into
110 * guest memory using rom_add_blob_fixed(). fixupcontext is
111 * an array giving the values to write in for the fixup types
112 * which write a value into the code array.
113 */
114 int i, len;
115 uint32_t *code;
116
117 len = 0;
118 while (insns[len].fixup != FIXUP_TERMINATOR) {
17
←
Loop condition is true. Entering loop body
→
18
←
Loop condition is false. Execution continues on line 122
→
119 len++;
120 }
121
122 code = g_new0(uint32_t, len)((uint32_t *) g_malloc0_n ((len), sizeof (uint32_t)));
123
124 for (i = 0; i < len; i++) {
19
←
Loop condition is true. Entering loop body
→
125 uint32_t insn = insns[i].insn;
126 FixupType fixup = insns[i].fixup;
127
128 switch (fixup) {
20
←
Control jumps to 'case FIXUP_DSB:' at line 136
→
129 case FIXUP_NONE:
130 break;
131 case FIXUP_BOARDID:
132 case FIXUP_ARGPTR:
133 case FIXUP_ENTRYPOINT:
134 case FIXUP_GIC_CPU_IF:
135 case FIXUP_BOOTREG:
136 case FIXUP_DSB:
137 insn = fixupcontext[fixup];
21
←
Assigned value is garbage or undefined
138 break;
139 default:
140 abort();
141 }
142 code[i] = tswap32(insn);
143 }
144
145 rom_add_blob_fixed(name, code, len * sizeof(uint32_t), addr)rom_add_blob(name, code, len * sizeof(uint32_t), addr, ((void
*)0), ((void*)0), ((void*)0));
146
147 g_free(code);
148}
149
150static void default_write_secondary(ARMCPU *cpu,
151 const struct arm_boot_info *info)
152{
153 uint32_t fixupcontext[FIXUP_MAX];
154
155 fixupcontext[FIXUP_GIC_CPU_IF] = info->gic_cpu_if_addr;
156 fixupcontext[FIXUP_BOOTREG] = info->smp_bootreg_addr;
157 if (arm_feature(&cpu->env, ARM_FEATURE_V7)) {
158 fixupcontext[FIXUP_DSB] = DSB_INSN0xf57ff04f;
159 } else {
160 fixupcontext[FIXUP_DSB] = CP15_DSB_INSN0xee070f9a;
161 }
162
163 write_bootloader("smpboot", info->smp_loader_start,
164 smpboot, fixupcontext);
165}
166
167static void default_reset_secondary(ARMCPU *cpu,
168 const struct arm_boot_info *info)
169{
170 CPUARMState *env = &cpu->env;
171
172 stl_phys_notdirty(info->smp_bootreg_addr, 0);
173 env->regs[15] = info->smp_loader_start;
174}
175
176#define WRITE_WORD(p, value)do { stl_phys_notdirty(p, value); p += 4; } while (0) do { \
177 stl_phys_notdirty(p, value); \
178 p += 4; \
179} while (0)
180
181static void set_kernel_args(const struct arm_boot_info *info)
182{
183 int initrd_size = info->initrd_size;
184 hwaddr base = info->loader_start;
185 hwaddr p;
186
187 p = base + KERNEL_ARGS_ADDR0x100;
188 /* ATAG_CORE */
189 WRITE_WORD(p, 5)do { stl_phys_notdirty(p, 5); p += 4; } while (0);
190 WRITE_WORD(p, 0x54410001)do { stl_phys_notdirty(p, 0x54410001); p += 4; } while (0);
191 WRITE_WORD(p, 1)do { stl_phys_notdirty(p, 1); p += 4; } while (0);
192 WRITE_WORD(p, 0x1000)do { stl_phys_notdirty(p, 0x1000); p += 4; } while (0);
193 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
194 /* ATAG_MEM */
195 /* TODO: handle multiple chips on one ATAG list */
196 WRITE_WORD(p, 4)do { stl_phys_notdirty(p, 4); p += 4; } while (0);
197 WRITE_WORD(p, 0x54410002)do { stl_phys_notdirty(p, 0x54410002); p += 4; } while (0);
198 WRITE_WORD(p, info->ram_size)do { stl_phys_notdirty(p, info->ram_size); p += 4; } while
(0);
199 WRITE_WORD(p, info->loader_start)do { stl_phys_notdirty(p, info->loader_start); p += 4; } while
(0);
200 if (initrd_size) {
201 /* ATAG_INITRD2 */
202 WRITE_WORD(p, 4)do { stl_phys_notdirty(p, 4); p += 4; } while (0);
203 WRITE_WORD(p, 0x54420005)do { stl_phys_notdirty(p, 0x54420005); p += 4; } while (0);
204 WRITE_WORD(p, info->initrd_start)do { stl_phys_notdirty(p, info->initrd_start); p += 4; } while
(0);
205 WRITE_WORD(p, initrd_size)do { stl_phys_notdirty(p, initrd_size); p += 4; } while (0);
206 }
207 if (info->kernel_cmdline && *info->kernel_cmdline) {
208 /* ATAG_CMDLINE */
209 int cmdline_size;
210
211 cmdline_size = strlen(info->kernel_cmdline);
212 cpu_physical_memory_write(p + 8, info->kernel_cmdline,
213 cmdline_size + 1);
214 cmdline_size = (cmdline_size >> 2) + 1;
215 WRITE_WORD(p, cmdline_size + 2)do { stl_phys_notdirty(p, cmdline_size + 2); p += 4; } while (
0);
216 WRITE_WORD(p, 0x54410009)do { stl_phys_notdirty(p, 0x54410009); p += 4; } while (0);
217 p += cmdline_size * 4;
218 }
219 if (info->atag_board) {
220 /* ATAG_BOARD */
221 int atag_board_len;
222 uint8_t atag_board_buf[0x1000];
223
224 atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
225 WRITE_WORD(p, (atag_board_len + 8) >> 2)do { stl_phys_notdirty(p, (atag_board_len + 8) >> 2); p
+= 4; } while (0);
226 WRITE_WORD(p, 0x414f4d50)do { stl_phys_notdirty(p, 0x414f4d50); p += 4; } while (0);
227 cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
228 p += atag_board_len;
229 }
230 /* ATAG_END */
231 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
232 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
233}
234
235static void set_kernel_args_old(const struct arm_boot_info *info)
236{
237 hwaddr p;
238 const char *s;
239 int initrd_size = info->initrd_size;
240 hwaddr base = info->loader_start;
241
242 /* see linux/include/asm-arm/setup.h */
243 p = base + KERNEL_ARGS_ADDR0x100;
244 /* page_size */
245 WRITE_WORD(p, 4096)do { stl_phys_notdirty(p, 4096); p += 4; } while (0);
246 /* nr_pages */
247 WRITE_WORD(p, info->ram_size / 4096)do { stl_phys_notdirty(p, info->ram_size / 4096); p += 4; }
while (0);
248 /* ramdisk_size */
249 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
250#define FLAG_READONLY1 1
251#define FLAG_RDLOAD4 4
252#define FLAG_RDPROMPT8 8
253 /* flags */
254 WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT)do { stl_phys_notdirty(p, 1 | 4 | 8); p += 4; } while (0);
255 /* rootdev */
256 WRITE_WORD(p, (31 << 8) | 0)do { stl_phys_notdirty(p, (31 << 8) | 0); p += 4; } while
(0); /* /dev/mtdblock0 */
257 /* video_num_cols */
258 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
259 /* video_num_rows */
260 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
261 /* video_x */
262 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
263 /* video_y */
264 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
265 /* memc_control_reg */
266 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
267 /* unsigned char sounddefault */
268 /* unsigned char adfsdrives */
269 /* unsigned char bytes_per_char_h */
270 /* unsigned char bytes_per_char_v */
271 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
272 /* pages_in_bank[4] */
273 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
274 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
275 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
276 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
277 /* pages_in_vram */
278 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
279 /* initrd_start */
280 if (initrd_size) {
281 WRITE_WORD(p, info->initrd_start)do { stl_phys_notdirty(p, info->initrd_start); p += 4; } while
(0);
282 } else {
283 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
284 }
285 /* initrd_size */
286 WRITE_WORD(p, initrd_size)do { stl_phys_notdirty(p, initrd_size); p += 4; } while (0);
287 /* rd_start */
288 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
289 /* system_rev */
290 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
291 /* system_serial_low */
292 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
293 /* system_serial_high */
294 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
295 /* mem_fclk_21285 */
296 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
297 /* zero unused fields */
298 while (p < base + KERNEL_ARGS_ADDR0x100 + 256 + 1024) {
299 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
300 }
301 s = info->kernel_cmdline;
302 if (s) {
303 cpu_physical_memory_write(p, s, strlen(s) + 1);
304 } else {
305 WRITE_WORD(p, 0)do { stl_phys_notdirty(p, 0); p += 4; } while (0);
306 }
307}
308
309static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo)
310{
311 void *fdt = NULL((void*)0);
312 int size, rc;
313 uint32_t acells, scells;
314
315 if (binfo->dtb_filename) {
316 char *filename;
317 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS0, binfo->dtb_filename);
318 if (!filename) {
319 fprintf(stderrstderr, "Couldn't open dtb file %s\n", binfo->dtb_filename);
320 goto fail;
321 }
322
323 fdt = load_device_tree(filename, &size);
324 if (!fdt) {
325 fprintf(stderrstderr, "Couldn't open dtb file %s\n", filename);
326 g_free(filename);
327 goto fail;
328 }
329 g_free(filename);
330 } else if (binfo->get_dtb) {
331 fdt = binfo->get_dtb(binfo, &size);
332 if (!fdt) {
333 fprintf(stderrstderr, "Board was unable to create a dtb blob\n");
334 goto fail;
335 }
336 }
337
338 acells = qemu_fdt_getprop_cell(fdt, "/", "#address-cells");
339 scells = qemu_fdt_getprop_cell(fdt, "/", "#size-cells");
340 if (acells == 0 || scells == 0) {
341 fprintf(stderrstderr, "dtb file invalid (#address-cells or #size-cells 0)\n");
342 goto fail;
343 }
344
345 if (scells < 2 && binfo->ram_size >= (1ULL << 32)) {
346 /* This is user error so deserves a friendlier error message
347 * than the failure of setprop_sized_cells would provide
348 */
349 fprintf(stderrstderr, "qemu: dtb file not compatible with "
350 "RAM size > 4GB\n");
351 goto fail;
352 }
353
354 rc = qemu_fdt_setprop_sized_cells(fdt, "/memory", "reg",({ uint64_t qdt_tmp[] = { acells, binfo->loader_start, scells
, binfo->ram_size }; qemu_fdt_setprop_sized_cells_from_array
(fdt, "/memory", "reg", (sizeof(qdt_tmp) / sizeof((qdt_tmp)[0
])) / 2, qdt_tmp); })
355 acells, binfo->loader_start,({ uint64_t qdt_tmp[] = { acells, binfo->loader_start, scells
, binfo->ram_size }; qemu_fdt_setprop_sized_cells_from_array
(fdt, "/memory", "reg", (sizeof(qdt_tmp) / sizeof((qdt_tmp)[0
])) / 2, qdt_tmp); })
356 scells, binfo->ram_size)({ uint64_t qdt_tmp[] = { acells, binfo->loader_start, scells
, binfo->ram_size }; qemu_fdt_setprop_sized_cells_from_array
(fdt, "/memory", "reg", (sizeof(qdt_tmp) / sizeof((qdt_tmp)[0
])) / 2, qdt_tmp); });
357 if (rc < 0) {
358 fprintf(stderrstderr, "couldn't set /memory/reg\n");
359 goto fail;
360 }
361
362 if (binfo->kernel_cmdline && *binfo->kernel_cmdline) {
363 rc = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
364 binfo->kernel_cmdline);
365 if (rc < 0) {
366 fprintf(stderrstderr, "couldn't set /chosen/bootargs\n");
367 goto fail;
368 }
369 }
370
371 if (binfo->initrd_size) {
372 rc = qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
373 binfo->initrd_start);
374 if (rc < 0) {
375 fprintf(stderrstderr, "couldn't set /chosen/linux,initrd-start\n");
376 goto fail;
377 }
378
379 rc = qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
380 binfo->initrd_start + binfo->initrd_size);
381 if (rc < 0) {
382 fprintf(stderrstderr, "couldn't set /chosen/linux,initrd-end\n");
383 goto fail;
384 }
385 }
386
387 if (binfo->modify_dtb) {
388 binfo->modify_dtb(binfo, fdt);
389 }
390
391 qemu_fdt_dumpdtb(fdt, size);
392
393 cpu_physical_memory_write(addr, fdt, size);
394
395 g_free(fdt);
396
397 return 0;
398
399fail:
400 g_free(fdt);
401 return -1;
402}
403
404static void do_cpu_reset(void *opaque)
405{
406 ARMCPU *cpu = opaque;
407 CPUARMState *env = &cpu->env;
408 const struct arm_boot_info *info = env->boot_info;
409
410 cpu_reset(CPU(cpu)((CPUState *)object_dynamic_cast_assert(((Object *)((cpu))), (
"cpu"), "/home/stefan/src/qemu/qemu.org/qemu/hw/arm/boot.c", 410
, __func__)));
411 if (info) {
412 if (!info->is_linux) {
413 /* Jump to the entry point. */
414 env->regs[15] = info->entry & 0xfffffffe;
415 env->thumb = info->entry & 1;
416 } else {
417 if (CPU(cpu)((CPUState *)object_dynamic_cast_assert(((Object *)((cpu))), (
"cpu"), "/home/stefan/src/qemu/qemu.org/qemu/hw/arm/boot.c", 417
, __func__)) == first_cpu((&cpus)->tqh_first)) {
418 if (env->aarch64) {
419 env->pc = info->loader_start;
420 } else {
421 env->regs[15] = info->loader_start;
422 }
423
424 if (!info->dtb_filename) {
425 if (old_param) {
426 set_kernel_args_old(info);
427 } else {
428 set_kernel_args(info);
429 }
430 }
431 } else {
432 info->secondary_cpu_reset_hook(cpu, info);
433 }
434 }
435 }
436}
437
438void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
439{
440 CPUState *cs = CPU(cpu)((CPUState *)object_dynamic_cast_assert(((Object *)((cpu))), (
"cpu"), "/home/stefan/src/qemu/qemu.org/qemu/hw/arm/boot.c", 440
, __func__));
441 int kernel_size;
442 int initrd_size;
443 int is_linux = 0;
444 uint64_t elf_entry;
445 hwaddr entry, kernel_load_offset;
446 int big_endian;
447 static const ARMInsnFixup *primary_loader;
448
449 /* Load the kernel. */
450 if (!info->kernel_filename) {
1
Taking false branch
→
451 /* If no kernel specified, do nothing; we will start from address 0
452 * (typically a boot ROM image) in the same way as hardware.
453 */
454 return;
455 }
456
457 if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
2
←
Taking false branch
→
458 primary_loader = bootloader_aarch64;
459 kernel_load_offset = KERNEL64_LOAD_ADDR0x00080000;
460 } else {
461 primary_loader = bootloader;
462 kernel_load_offset = KERNEL_LOAD_ADDR0x00010000;
463 }
464
465 info->dtb_filename = qemu_opt_get(qemu_get_machine_opts(), "dtb");
466
467 if (!info->secondary_cpu_reset_hook) {
3
←
Taking false branch
→
468 info->secondary_cpu_reset_hook = default_reset_secondary;
469 }
470 if (!info->write_secondary_boot) {
4
←
Taking false branch
→
471 info->write_secondary_boot = default_write_secondary;
472 }
473
474 if (info->nb_cpus == 0)
5
←
Taking false branch
→
475 info->nb_cpus = 1;
476
477#ifdef TARGET_WORDS_BIGENDIAN
478 big_endian = 1;
479#else
480 big_endian = 0;
481#endif
482
483 /* We want to put the initrd far enough into RAM that when the
484 * kernel is uncompressed it will not clobber the initrd. However
485 * on boards without much RAM we must ensure that we still leave
486 * enough room for a decent sized initrd, and on boards with large
487 * amounts of RAM we must avoid the initrd being so far up in RAM
488 * that it is outside lowmem and inaccessible to the kernel.
489 * So for boards with less than 256MB of RAM we put the initrd
490 * halfway into RAM, and for boards with 256MB of RAM or more we put
491 * the initrd at 128MB.
492 */
493 info->initrd_start = info->loader_start +
494 MIN(info->ram_size / 2, 128 * 1024 * 1024)(((info->ram_size / 2) < (128 * 1024 * 1024)) ? (info->
ram_size / 2) : (128 * 1024 * 1024));
495
496 /* Assume that raw images are linux kernels, and ELF images are not. */
497 kernel_size = load_elf(info->kernel_filename, NULL((void*)0), NULL((void*)0), &elf_entry,
498 NULL((void*)0), NULL((void*)0), big_endian, ELF_MACHINE183, 1);
499 entry = elf_entry;
500 if (kernel_size < 0) {
6
←
Assuming 'kernel_size' is < 0
→
7
←
Taking true branch
→
501 kernel_size = load_uimage(info->kernel_filename, &entry, NULL((void*)0),
502 &is_linux);
503 }
504 if (kernel_size < 0) {
8
←
Assuming 'kernel_size' is >= 0
→
9
←
Taking false branch
→
505 entry = info->loader_start + kernel_load_offset;
506 kernel_size = load_image_targphys(info->kernel_filename, entry,
507 info->ram_size - kernel_load_offset);
508 is_linux = 1;
509 }
510 if (kernel_size < 0) {
10
←
Taking false branch
→
511 fprintf(stderrstderr, "qemu: could not load kernel '%s'\n",
512 info->kernel_filename);
513 exit(1);
514 }
515 info->entry = entry;
516 if (is_linux) {
11
←
Assuming 'is_linux' is not equal to 0
→
12
←
Taking true branch
→
517 uint32_t fixupcontext[FIXUP_MAX];
518
519 if (info->initrd_filename) {
13
←
Taking false branch
→
520 initrd_size = load_ramdisk(info->initrd_filename,
521 info->initrd_start,
522 info->ram_size -
523 info->initrd_start);
524 if (initrd_size < 0) {
525 initrd_size = load_image_targphys(info->initrd_filename,
526 info->initrd_start,
527 info->ram_size -
528 info->initrd_start);
529 }
530 if (initrd_size < 0) {
531 fprintf(stderrstderr, "qemu: could not load initrd '%s'\n",
532 info->initrd_filename);
533 exit(1);
534 }
535 } else {
536 initrd_size = 0;
537 }
538 info->initrd_size = initrd_size;
539
540 fixupcontext[FIXUP_BOARDID] = info->board_id;
541
542 /* for device tree boot, we pass the DTB directly in r2. Otherwise
543 * we point to the kernel args.
544 */
545 if (info->dtb_filename || info->get_dtb) {
14
←
Taking false branch
→
546 /* Place the DTB after the initrd in memory. Note that some
547 * kernels will trash anything in the 4K page the initrd
548 * ends in, so make sure the DTB isn't caught up in that.
549 */
550 hwaddr dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size,(((info->initrd_start + initrd_size) + (4096) - 1) / ((4096
)) * ((4096)))
551 4096)(((info->initrd_start + initrd_size) + (4096) - 1) / ((4096
)) * ((4096)));
552 if (load_dtb(dtb_start, info)) {
553 exit(1);
554 }
555 fixupcontext[FIXUP_ARGPTR] = dtb_start;
556 } else {
557 fixupcontext[FIXUP_ARGPTR] = info->loader_start + KERNEL_ARGS_ADDR0x100;
558 if (info->ram_size >= (1ULL << 32)) {
15
←
Taking false branch
→
559 fprintf(stderrstderr, "qemu: RAM size must be less than 4GB to boot"
560 " Linux kernel using ATAGS (try passing a device tree"
561 " using -dtb)\n");
562 exit(1);
563 }
564 }
565 fixupcontext[FIXUP_ENTRYPOINT] = entry;
566
567 write_bootloader("bootloader", info->loader_start,
16
←
Calling 'write_bootloader'
→
568 primary_loader, fixupcontext);
569
570 if (info->nb_cpus > 1) {
571 info->write_secondary_boot(cpu, info);
572 }
573 }
574 info->is_linux = is_linux;
575
576 for (; cs; cs = CPU_NEXT(cs)((cs)->node.tqe_next)) {
577 cpu = ARM_CPU(cs)((ARMCPU *)object_dynamic_cast_assert(((Object *)((cs))), ("arm-cpu"
), "/home/stefan/src/qemu/qemu.org/qemu/hw/arm/boot.c", 577, __func__
));
578 cpu->env.boot_info = info;
579 qemu_register_reset(do_cpu_reset, cpu);
580 }
581}