4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licensed under the GPL.
12 #include "hw/arm/arm.h"
13 #include "hw/arm/linux-boot-if.h"
14 #include "sysemu/sysemu.h"
15 #include "hw/boards.h"
16 #include "hw/loader.h"
18 #include "sysemu/device_tree.h"
19 #include "qemu/config-file.h"
20 #include "exec/address-spaces.h"
22 /* Kernel boot protocol is specified in the kernel docs
23 * Documentation/arm/Booting and Documentation/arm64/booting.txt
24 * They have different preferred image load offsets from system RAM base.
26 #define KERNEL_ARGS_ADDR 0x100
27 #define KERNEL_LOAD_ADDR 0x00010000
28 #define KERNEL64_LOAD_ADDR 0x00080000
31 FIXUP_NONE
= 0, /* do nothing */
32 FIXUP_TERMINATOR
, /* end of insns */
33 FIXUP_BOARDID
, /* overwrite with board ID number */
34 FIXUP_BOARD_SETUP
, /* overwrite with board specific setup code address */
35 FIXUP_ARGPTR
, /* overwrite with pointer to kernel args */
36 FIXUP_ENTRYPOINT
, /* overwrite with kernel entry point */
37 FIXUP_GIC_CPU_IF
, /* overwrite with GIC CPU interface address */
38 FIXUP_BOOTREG
, /* overwrite with boot register address */
39 FIXUP_DSB
, /* overwrite with correct DSB insn for cpu */
43 typedef struct ARMInsnFixup
{
48 static const ARMInsnFixup bootloader_aarch64
[] = {
49 { 0x580000c0 }, /* ldr x0, arg ; Load the lower 32-bits of DTB */
50 { 0xaa1f03e1 }, /* mov x1, xzr */
51 { 0xaa1f03e2 }, /* mov x2, xzr */
52 { 0xaa1f03e3 }, /* mov x3, xzr */
53 { 0x58000084 }, /* ldr x4, entry ; Load the lower 32-bits of kernel entry */
54 { 0xd61f0080 }, /* br x4 ; Jump to the kernel entry point */
55 { 0, FIXUP_ARGPTR
}, /* arg: .word @DTB Lower 32-bits */
56 { 0 }, /* .word @DTB Higher 32-bits */
57 { 0, FIXUP_ENTRYPOINT
}, /* entry: .word @Kernel Entry Lower 32-bits */
58 { 0 }, /* .word @Kernel Entry Higher 32-bits */
59 { 0, FIXUP_TERMINATOR
}
62 /* A very small bootloader: call the board-setup code (if needed),
63 * set r0-r2, then jump to the kernel.
64 * If we're not calling boot setup code then we don't copy across
65 * the first BOOTLOADER_NO_BOARD_SETUP_OFFSET insns in this array.
68 static const ARMInsnFixup bootloader
[] = {
69 { 0xe28fe008 }, /* add lr, pc, #8 */
70 { 0xe51ff004 }, /* ldr pc, [pc, #-4] */
71 { 0, FIXUP_BOARD_SETUP
},
72 #define BOOTLOADER_NO_BOARD_SETUP_OFFSET 3
73 { 0xe3a00000 }, /* mov r0, #0 */
74 { 0xe59f1004 }, /* ldr r1, [pc, #4] */
75 { 0xe59f2004 }, /* ldr r2, [pc, #4] */
76 { 0xe59ff004 }, /* ldr pc, [pc, #4] */
79 { 0, FIXUP_ENTRYPOINT
},
80 { 0, FIXUP_TERMINATOR
}
83 /* Handling for secondary CPU boot in a multicore system.
84 * Unlike the uniprocessor/primary CPU boot, this is platform
85 * dependent. The default code here is based on the secondary
86 * CPU boot protocol used on realview/vexpress boards, with
87 * some parameterisation to increase its flexibility.
88 * QEMU platform models for which this code is not appropriate
89 * should override write_secondary_boot and secondary_cpu_reset_hook
92 * This code enables the interrupt controllers for the secondary
93 * CPUs and then puts all the secondary CPUs into a loop waiting
94 * for an interprocessor interrupt and polling a configurable
95 * location for the kernel secondary CPU entry point.
97 #define DSB_INSN 0xf57ff04f
98 #define CP15_DSB_INSN 0xee070f9a /* mcr cp15, 0, r0, c7, c10, 4 */
100 static const ARMInsnFixup smpboot
[] = {
101 { 0xe59f2028 }, /* ldr r2, gic_cpu_if */
102 { 0xe59f0028 }, /* ldr r0, bootreg_addr */
103 { 0xe3a01001 }, /* mov r1, #1 */
104 { 0xe5821000 }, /* str r1, [r2] - set GICC_CTLR.Enable */
105 { 0xe3a010ff }, /* mov r1, #0xff */
106 { 0xe5821004 }, /* str r1, [r2, 4] - set GIC_PMR.Priority to 0xff */
107 { 0, FIXUP_DSB
}, /* dsb */
108 { 0xe320f003 }, /* wfi */
109 { 0xe5901000 }, /* ldr r1, [r0] */
110 { 0xe1110001 }, /* tst r1, r1 */
111 { 0x0afffffb }, /* beq <wfi> */
112 { 0xe12fff11 }, /* bx r1 */
113 { 0, FIXUP_GIC_CPU_IF
}, /* gic_cpu_if: .word 0x.... */
114 { 0, FIXUP_BOOTREG
}, /* bootreg_addr: .word 0x.... */
115 { 0, FIXUP_TERMINATOR
}
118 static void write_bootloader(const char *name
, hwaddr addr
,
119 const ARMInsnFixup
*insns
, uint32_t *fixupcontext
)
121 /* Fix up the specified bootloader fragment and write it into
122 * guest memory using rom_add_blob_fixed(). fixupcontext is
123 * an array giving the values to write in for the fixup types
124 * which write a value into the code array.
130 while (insns
[len
].fixup
!= FIXUP_TERMINATOR
) {
134 code
= g_new0(uint32_t, len
);
136 for (i
= 0; i
< len
; i
++) {
137 uint32_t insn
= insns
[i
].insn
;
138 FixupType fixup
= insns
[i
].fixup
;
144 case FIXUP_BOARD_SETUP
:
146 case FIXUP_ENTRYPOINT
:
147 case FIXUP_GIC_CPU_IF
:
150 insn
= fixupcontext
[fixup
];
155 code
[i
] = tswap32(insn
);
158 rom_add_blob_fixed(name
, code
, len
* sizeof(uint32_t), addr
);
163 static void default_write_secondary(ARMCPU
*cpu
,
164 const struct arm_boot_info
*info
)
166 uint32_t fixupcontext
[FIXUP_MAX
];
168 fixupcontext
[FIXUP_GIC_CPU_IF
] = info
->gic_cpu_if_addr
;
169 fixupcontext
[FIXUP_BOOTREG
] = info
->smp_bootreg_addr
;
170 if (arm_feature(&cpu
->env
, ARM_FEATURE_V7
)) {
171 fixupcontext
[FIXUP_DSB
] = DSB_INSN
;
173 fixupcontext
[FIXUP_DSB
] = CP15_DSB_INSN
;
176 write_bootloader("smpboot", info
->smp_loader_start
,
177 smpboot
, fixupcontext
);
180 static void default_reset_secondary(ARMCPU
*cpu
,
181 const struct arm_boot_info
*info
)
183 CPUState
*cs
= CPU(cpu
);
185 address_space_stl_notdirty(&address_space_memory
, info
->smp_bootreg_addr
,
186 0, MEMTXATTRS_UNSPECIFIED
, NULL
);
187 cpu_set_pc(cs
, info
->smp_loader_start
);
190 static inline bool have_dtb(const struct arm_boot_info
*info
)
192 return info
->dtb_filename
|| info
->get_dtb
;
195 #define WRITE_WORD(p, value) do { \
196 address_space_stl_notdirty(&address_space_memory, p, value, \
197 MEMTXATTRS_UNSPECIFIED, NULL); \
201 static void set_kernel_args(const struct arm_boot_info
*info
)
203 int initrd_size
= info
->initrd_size
;
204 hwaddr base
= info
->loader_start
;
207 p
= base
+ KERNEL_ARGS_ADDR
;
210 WRITE_WORD(p
, 0x54410001);
212 WRITE_WORD(p
, 0x1000);
215 /* TODO: handle multiple chips on one ATAG list */
217 WRITE_WORD(p
, 0x54410002);
218 WRITE_WORD(p
, info
->ram_size
);
219 WRITE_WORD(p
, info
->loader_start
);
223 WRITE_WORD(p
, 0x54420005);
224 WRITE_WORD(p
, info
->initrd_start
);
225 WRITE_WORD(p
, initrd_size
);
227 if (info
->kernel_cmdline
&& *info
->kernel_cmdline
) {
231 cmdline_size
= strlen(info
->kernel_cmdline
);
232 cpu_physical_memory_write(p
+ 8, info
->kernel_cmdline
,
234 cmdline_size
= (cmdline_size
>> 2) + 1;
235 WRITE_WORD(p
, cmdline_size
+ 2);
236 WRITE_WORD(p
, 0x54410009);
237 p
+= cmdline_size
* 4;
239 if (info
->atag_board
) {
242 uint8_t atag_board_buf
[0x1000];
244 atag_board_len
= (info
->atag_board(info
, atag_board_buf
) + 3) & ~3;
245 WRITE_WORD(p
, (atag_board_len
+ 8) >> 2);
246 WRITE_WORD(p
, 0x414f4d50);
247 cpu_physical_memory_write(p
, atag_board_buf
, atag_board_len
);
255 static void set_kernel_args_old(const struct arm_boot_info
*info
)
259 int initrd_size
= info
->initrd_size
;
260 hwaddr base
= info
->loader_start
;
262 /* see linux/include/asm-arm/setup.h */
263 p
= base
+ KERNEL_ARGS_ADDR
;
267 WRITE_WORD(p
, info
->ram_size
/ 4096);
270 #define FLAG_READONLY 1
271 #define FLAG_RDLOAD 4
272 #define FLAG_RDPROMPT 8
274 WRITE_WORD(p
, FLAG_READONLY
| FLAG_RDLOAD
| FLAG_RDPROMPT
);
276 WRITE_WORD(p
, (31 << 8) | 0); /* /dev/mtdblock0 */
285 /* memc_control_reg */
287 /* unsigned char sounddefault */
288 /* unsigned char adfsdrives */
289 /* unsigned char bytes_per_char_h */
290 /* unsigned char bytes_per_char_v */
292 /* pages_in_bank[4] */
301 WRITE_WORD(p
, info
->initrd_start
);
306 WRITE_WORD(p
, initrd_size
);
311 /* system_serial_low */
313 /* system_serial_high */
317 /* zero unused fields */
318 while (p
< base
+ KERNEL_ARGS_ADDR
+ 256 + 1024) {
321 s
= info
->kernel_cmdline
;
323 cpu_physical_memory_write(p
, s
, strlen(s
) + 1);
330 * load_dtb() - load a device tree binary image into memory
331 * @addr: the address to load the image at
332 * @binfo: struct describing the boot environment
333 * @addr_limit: upper limit of the available memory area at @addr
335 * Load a device tree supplied by the machine or by the user with the
336 * '-dtb' command line option, and put it at offset @addr in target
339 * If @addr_limit contains a meaningful value (i.e., it is strictly greater
340 * than @addr), the device tree is only loaded if its size does not exceed
343 * Returns: the size of the device tree image on success,
344 * 0 if the image size exceeds the limit,
347 * Note: Must not be called unless have_dtb(binfo) is true.
349 static int load_dtb(hwaddr addr
, const struct arm_boot_info
*binfo
,
354 uint32_t acells
, scells
;
356 if (binfo
->dtb_filename
) {
358 filename
= qemu_find_file(QEMU_FILE_TYPE_BIOS
, binfo
->dtb_filename
);
360 fprintf(stderr
, "Couldn't open dtb file %s\n", binfo
->dtb_filename
);
364 fdt
= load_device_tree(filename
, &size
);
366 fprintf(stderr
, "Couldn't open dtb file %s\n", filename
);
372 fdt
= binfo
->get_dtb(binfo
, &size
);
374 fprintf(stderr
, "Board was unable to create a dtb blob\n");
379 if (addr_limit
> addr
&& size
> (addr_limit
- addr
)) {
380 /* Installing the device tree blob at addr would exceed addr_limit.
381 * Whether this constitutes failure is up to the caller to decide,
382 * so just return 0 as size, i.e., no error.
388 acells
= qemu_fdt_getprop_cell(fdt
, "/", "#address-cells");
389 scells
= qemu_fdt_getprop_cell(fdt
, "/", "#size-cells");
390 if (acells
== 0 || scells
== 0) {
391 fprintf(stderr
, "dtb file invalid (#address-cells or #size-cells 0)\n");
395 if (scells
< 2 && binfo
->ram_size
>= (1ULL << 32)) {
396 /* This is user error so deserves a friendlier error message
397 * than the failure of setprop_sized_cells would provide
399 fprintf(stderr
, "qemu: dtb file not compatible with "
404 rc
= qemu_fdt_setprop_sized_cells(fdt
, "/memory", "reg",
405 acells
, binfo
->loader_start
,
406 scells
, binfo
->ram_size
);
408 fprintf(stderr
, "couldn't set /memory/reg\n");
412 if (binfo
->kernel_cmdline
&& *binfo
->kernel_cmdline
) {
413 rc
= qemu_fdt_setprop_string(fdt
, "/chosen", "bootargs",
414 binfo
->kernel_cmdline
);
416 fprintf(stderr
, "couldn't set /chosen/bootargs\n");
421 if (binfo
->initrd_size
) {
422 rc
= qemu_fdt_setprop_cell(fdt
, "/chosen", "linux,initrd-start",
423 binfo
->initrd_start
);
425 fprintf(stderr
, "couldn't set /chosen/linux,initrd-start\n");
429 rc
= qemu_fdt_setprop_cell(fdt
, "/chosen", "linux,initrd-end",
430 binfo
->initrd_start
+ binfo
->initrd_size
);
432 fprintf(stderr
, "couldn't set /chosen/linux,initrd-end\n");
437 if (binfo
->modify_dtb
) {
438 binfo
->modify_dtb(binfo
, fdt
);
441 qemu_fdt_dumpdtb(fdt
, size
);
443 /* Put the DTB into the memory map as a ROM image: this will ensure
444 * the DTB is copied again upon reset, even if addr points into RAM.
446 rom_add_blob_fixed("dtb", fdt
, size
, addr
);
457 static void do_cpu_reset(void *opaque
)
459 ARMCPU
*cpu
= opaque
;
460 CPUState
*cs
= CPU(cpu
);
461 CPUARMState
*env
= &cpu
->env
;
462 const struct arm_boot_info
*info
= env
->boot_info
;
466 if (!info
->is_linux
) {
467 /* Jump to the entry point. */
468 uint64_t entry
= info
->entry
;
471 env
->thumb
= info
->entry
& 1;
474 cpu_set_pc(cs
, entry
);
476 /* If we are booting Linux then we need to check whether we are
477 * booting into secure or non-secure state and adjust the state
478 * accordingly. Out of reset, ARM is defined to be in secure state
479 * (SCR.NS = 0), we change that here if non-secure boot has been
482 if (arm_feature(env
, ARM_FEATURE_EL3
)) {
483 /* AArch64 is defined to come out of reset into EL3 if enabled.
484 * If we are booting Linux then we need to adjust our EL as
485 * Linux expects us to be in EL2 or EL1. AArch32 resets into
486 * SVC, which Linux expects, so no privilege/exception level to
490 if (arm_feature(env
, ARM_FEATURE_EL2
)) {
491 env
->pstate
= PSTATE_MODE_EL2h
;
493 env
->pstate
= PSTATE_MODE_EL1h
;
497 /* Set to non-secure if not a secure boot */
498 if (!info
->secure_boot
) {
499 /* Linux expects non-secure state */
500 env
->cp15
.scr_el3
|= SCR_NS
;
504 if (cs
== first_cpu
) {
505 cpu_set_pc(cs
, info
->loader_start
);
507 if (!have_dtb(info
)) {
509 set_kernel_args_old(info
);
511 set_kernel_args(info
);
515 info
->secondary_cpu_reset_hook(cpu
, info
);
522 * load_image_to_fw_cfg() - Load an image file into an fw_cfg entry identified
524 * @fw_cfg: The firmware config instance to store the data in.
525 * @size_key: The firmware config key to store the size of the loaded
526 * data under, with fw_cfg_add_i32().
527 * @data_key: The firmware config key to store the loaded data under,
528 * with fw_cfg_add_bytes().
529 * @image_name: The name of the image file to load. If it is NULL, the
530 * function returns without doing anything.
531 * @try_decompress: Whether the image should be decompressed (gunzipped) before
532 * adding it to fw_cfg. If decompression fails, the image is
535 * In case of failure, the function prints an error message to stderr and the
536 * process exits with status 1.
538 static void load_image_to_fw_cfg(FWCfgState
*fw_cfg
, uint16_t size_key
,
539 uint16_t data_key
, const char *image_name
,
545 if (image_name
== NULL
) {
549 if (try_decompress
) {
550 size
= load_image_gzipped_buffer(image_name
,
551 LOAD_IMAGE_MAX_GUNZIP_BYTES
, &data
);
554 if (size
== (size_t)-1) {
558 if (!g_file_get_contents(image_name
, &contents
, &length
, NULL
)) {
559 fprintf(stderr
, "failed to load \"%s\"\n", image_name
);
563 data
= (uint8_t *)contents
;
566 fw_cfg_add_i32(fw_cfg
, size_key
, size
);
567 fw_cfg_add_bytes(fw_cfg
, data_key
, data
, size
);
570 static int do_arm_linux_init(Object
*obj
, void *opaque
)
572 if (object_dynamic_cast(obj
, TYPE_ARM_LINUX_BOOT_IF
)) {
573 ARMLinuxBootIf
*albif
= ARM_LINUX_BOOT_IF(obj
);
574 ARMLinuxBootIfClass
*albifc
= ARM_LINUX_BOOT_IF_GET_CLASS(obj
);
575 struct arm_boot_info
*info
= opaque
;
577 if (albifc
->arm_linux_init
) {
578 albifc
->arm_linux_init(albif
, info
->secure_boot
);
584 static void arm_load_kernel_notify(Notifier
*notifier
, void *data
)
590 uint64_t elf_entry
, elf_low_addr
, elf_high_addr
;
592 hwaddr entry
, kernel_load_offset
;
594 static const ARMInsnFixup
*primary_loader
;
595 ArmLoadKernelNotifier
*n
= DO_UPCAST(ArmLoadKernelNotifier
,
597 ARMCPU
*cpu
= n
->cpu
;
598 struct arm_boot_info
*info
=
599 container_of(n
, struct arm_boot_info
, load_kernel_notifier
);
601 /* Load the kernel. */
602 if (!info
->kernel_filename
|| info
->firmware_loaded
) {
604 if (have_dtb(info
)) {
605 /* If we have a device tree blob, but no kernel to supply it to (or
606 * the kernel is supposed to be loaded by the bootloader), copy the
607 * DTB to the base of RAM for the bootloader to pick up.
609 if (load_dtb(info
->loader_start
, info
, 0) < 0) {
614 if (info
->kernel_filename
) {
616 bool try_decompressing_kernel
;
618 fw_cfg
= fw_cfg_find();
619 try_decompressing_kernel
= arm_feature(&cpu
->env
,
620 ARM_FEATURE_AARCH64
);
622 /* Expose the kernel, the command line, and the initrd in fw_cfg.
623 * We don't process them here at all, it's all left to the
626 load_image_to_fw_cfg(fw_cfg
,
627 FW_CFG_KERNEL_SIZE
, FW_CFG_KERNEL_DATA
,
628 info
->kernel_filename
,
629 try_decompressing_kernel
);
630 load_image_to_fw_cfg(fw_cfg
,
631 FW_CFG_INITRD_SIZE
, FW_CFG_INITRD_DATA
,
632 info
->initrd_filename
, false);
634 if (info
->kernel_cmdline
) {
635 fw_cfg_add_i32(fw_cfg
, FW_CFG_CMDLINE_SIZE
,
636 strlen(info
->kernel_cmdline
) + 1);
637 fw_cfg_add_string(fw_cfg
, FW_CFG_CMDLINE_DATA
,
638 info
->kernel_cmdline
);
642 /* We will start from address 0 (typically a boot ROM image) in the
643 * same way as hardware.
648 if (arm_feature(&cpu
->env
, ARM_FEATURE_AARCH64
)) {
649 primary_loader
= bootloader_aarch64
;
650 kernel_load_offset
= KERNEL64_LOAD_ADDR
;
651 elf_machine
= EM_AARCH64
;
653 primary_loader
= bootloader
;
654 if (!info
->write_board_setup
) {
655 primary_loader
+= BOOTLOADER_NO_BOARD_SETUP_OFFSET
;
657 kernel_load_offset
= KERNEL_LOAD_ADDR
;
658 elf_machine
= EM_ARM
;
661 info
->dtb_filename
= qemu_opt_get(qemu_get_machine_opts(), "dtb");
663 if (!info
->secondary_cpu_reset_hook
) {
664 info
->secondary_cpu_reset_hook
= default_reset_secondary
;
666 if (!info
->write_secondary_boot
) {
667 info
->write_secondary_boot
= default_write_secondary
;
670 if (info
->nb_cpus
== 0)
673 #ifdef TARGET_WORDS_BIGENDIAN
679 /* We want to put the initrd far enough into RAM that when the
680 * kernel is uncompressed it will not clobber the initrd. However
681 * on boards without much RAM we must ensure that we still leave
682 * enough room for a decent sized initrd, and on boards with large
683 * amounts of RAM we must avoid the initrd being so far up in RAM
684 * that it is outside lowmem and inaccessible to the kernel.
685 * So for boards with less than 256MB of RAM we put the initrd
686 * halfway into RAM, and for boards with 256MB of RAM or more we put
687 * the initrd at 128MB.
689 info
->initrd_start
= info
->loader_start
+
690 MIN(info
->ram_size
/ 2, 128 * 1024 * 1024);
692 /* Assume that raw images are linux kernels, and ELF images are not. */
693 kernel_size
= load_elf(info
->kernel_filename
, NULL
, NULL
, &elf_entry
,
694 &elf_low_addr
, &elf_high_addr
, big_endian
,
696 if (kernel_size
> 0 && have_dtb(info
)) {
697 /* If there is still some room left at the base of RAM, try and put
698 * the DTB there like we do for images loaded with -bios or -pflash.
700 if (elf_low_addr
> info
->loader_start
701 || elf_high_addr
< info
->loader_start
) {
702 /* Pass elf_low_addr as address limit to load_dtb if it may be
703 * pointing into RAM, otherwise pass '0' (no limit)
705 if (elf_low_addr
< info
->loader_start
) {
708 if (load_dtb(info
->loader_start
, info
, elf_low_addr
) < 0) {
714 if (kernel_size
< 0) {
715 kernel_size
= load_uimage(info
->kernel_filename
, &entry
, NULL
,
716 &is_linux
, NULL
, NULL
);
718 /* On aarch64, it's the bootloader's job to uncompress the kernel. */
719 if (arm_feature(&cpu
->env
, ARM_FEATURE_AARCH64
) && kernel_size
< 0) {
720 entry
= info
->loader_start
+ kernel_load_offset
;
721 kernel_size
= load_image_gzipped(info
->kernel_filename
, entry
,
722 info
->ram_size
- kernel_load_offset
);
725 if (kernel_size
< 0) {
726 entry
= info
->loader_start
+ kernel_load_offset
;
727 kernel_size
= load_image_targphys(info
->kernel_filename
, entry
,
728 info
->ram_size
- kernel_load_offset
);
731 if (kernel_size
< 0) {
732 fprintf(stderr
, "qemu: could not load kernel '%s'\n",
733 info
->kernel_filename
);
738 uint32_t fixupcontext
[FIXUP_MAX
];
740 if (info
->initrd_filename
) {
741 initrd_size
= load_ramdisk(info
->initrd_filename
,
745 if (initrd_size
< 0) {
746 initrd_size
= load_image_targphys(info
->initrd_filename
,
751 if (initrd_size
< 0) {
752 fprintf(stderr
, "qemu: could not load initrd '%s'\n",
753 info
->initrd_filename
);
759 info
->initrd_size
= initrd_size
;
761 fixupcontext
[FIXUP_BOARDID
] = info
->board_id
;
762 fixupcontext
[FIXUP_BOARD_SETUP
] = info
->board_setup_addr
;
764 /* for device tree boot, we pass the DTB directly in r2. Otherwise
765 * we point to the kernel args.
767 if (have_dtb(info
)) {
771 if (elf_machine
== EM_AARCH64
) {
773 * Some AArch64 kernels on early bootup map the fdt region as
775 * [ ALIGN_DOWN(fdt, 2MB) ... ALIGN_DOWN(fdt, 2MB) + 2MB ]
777 * Let's play safe and prealign it to 2MB to give us some space.
779 align
= 2 * 1024 * 1024;
782 * Some 32bit kernels will trash anything in the 4K page the
783 * initrd ends in, so make sure the DTB isn't caught up in that.
788 /* Place the DTB after the initrd in memory with alignment. */
789 dtb_start
= QEMU_ALIGN_UP(info
->initrd_start
+ initrd_size
, align
);
790 if (load_dtb(dtb_start
, info
, 0) < 0) {
793 fixupcontext
[FIXUP_ARGPTR
] = dtb_start
;
795 fixupcontext
[FIXUP_ARGPTR
] = info
->loader_start
+ KERNEL_ARGS_ADDR
;
796 if (info
->ram_size
>= (1ULL << 32)) {
797 fprintf(stderr
, "qemu: RAM size must be less than 4GB to boot"
798 " Linux kernel using ATAGS (try passing a device tree"
803 fixupcontext
[FIXUP_ENTRYPOINT
] = entry
;
805 write_bootloader("bootloader", info
->loader_start
,
806 primary_loader
, fixupcontext
);
808 if (info
->nb_cpus
> 1) {
809 info
->write_secondary_boot(cpu
, info
);
811 if (info
->write_board_setup
) {
812 info
->write_board_setup(cpu
, info
);
815 /* Notify devices which need to fake up firmware initialization
816 * that we're doing a direct kernel boot.
818 object_child_foreach_recursive(object_get_root(),
819 do_arm_linux_init
, info
);
821 info
->is_linux
= is_linux
;
823 for (cs
= CPU(cpu
); cs
; cs
= CPU_NEXT(cs
)) {
824 ARM_CPU(cs
)->env
.boot_info
= info
;
828 void arm_load_kernel(ARMCPU
*cpu
, struct arm_boot_info
*info
)
832 info
->load_kernel_notifier
.cpu
= cpu
;
833 info
->load_kernel_notifier
.notifier
.notify
= arm_load_kernel_notify
;
834 qemu_add_machine_init_done_notifier(&info
->load_kernel_notifier
.notifier
);
836 /* CPU objects (unlike devices) are not automatically reset on system
837 * reset, so we must always register a handler to do so. If we're
838 * actually loading a kernel, the handler is also responsible for
839 * arranging that we start it correctly.
841 for (cs
= CPU(cpu
); cs
; cs
= CPU_NEXT(cs
)) {
842 qemu_register_reset(do_cpu_reset
, ARM_CPU(cs
));
846 static const TypeInfo arm_linux_boot_if_info
= {
847 .name
= TYPE_ARM_LINUX_BOOT_IF
,
848 .parent
= TYPE_INTERFACE
,
849 .class_size
= sizeof(ARMLinuxBootIfClass
),
852 static void arm_linux_boot_register_types(void)
854 type_register_static(&arm_linux_boot_if_info
);
857 type_init(arm_linux_boot_register_types
)