1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * Texas Instruments, <www.ti.com>
9 #include <binman_sym.h>
10 #include <linker_lists.h>
12 /* Platform-specific defines */
13 #include <linux/compiler.h>
14 #include <asm/global_data.h>
21 /* Value in r0 indicates we booted from U-Boot */
22 #define UBOOT_NOT_LOADED_FROM_SPL 0x13578642
25 #define MMCSD_MODE_UNDEFINED 0
26 #define MMCSD_MODE_RAW 1
27 #define MMCSD_MODE_FS 2
28 #define MMCSD_MODE_EMMCBOOT 3
32 struct spl_boot_device;
35 * u_boot_first_phase() - check if this is the first U-Boot phase
37 * U-Boot has up to three phases: TPL, SPL and U-Boot proper. Depending on the
38 * build flags we can determine whether the current build is for the first
39 * phase of U-Boot or not. If there is no SPL, then this is U-Boot proper. If
40 * there is SPL but no TPL, the the first phase is SPL. If there is TPL, then
41 * it is the first phase.
43 * @returns true if this is the first phase of U-Boot
46 static inline bool u_boot_first_phase(void)
48 if (IS_ENABLED(CONFIG_TPL)) {
49 if (IS_ENABLED(CONFIG_TPL_BUILD))
51 } else if (IS_ENABLED(CONFIG_SPL)) {
52 if (IS_ENABLED(CONFIG_SPL_BUILD))
62 PHASE_NONE, /* Invalid phase, signifying before U-Boot */
63 PHASE_TPL, /* Running in TPL */
64 PHASE_SPL, /* Running in SPL */
65 PHASE_BOARD_F, /* Running in U-Boot before relocation */
66 PHASE_BOARD_R, /* Running in U-Boot after relocation */
70 * spl_phase() - Find out the phase of U-Boot
72 * This can be used to avoid #ifdef logic and use if() instead.
74 * For example, to include code only in TPL, you might do:
76 * #ifdef CONFIG_TPL_BUILD
80 * but with this you can use:
82 * if (spl_phase() == PHASE_TPL) {
86 * To include code only in SPL, you might do:
88 * #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD)
92 * but with this you can use:
94 * if (spl_phase() == PHASE_SPL) {
98 * To include code only in U-Boot proper, you might do:
100 * #ifndef CONFIG_SPL_BUILD
104 * but with this you can use:
106 * if (spl_phase() == PHASE_BOARD_F) {
110 * @return U-Boot phase
112 static inline enum u_boot_phase spl_phase(void)
114 #ifdef CONFIG_TPL_BUILD
116 #elif CONFIG_SPL_BUILD
119 DECLARE_GLOBAL_DATA_PTR;
121 if (!(gd->flags & GD_FLG_RELOC))
122 return PHASE_BOARD_F;
124 return PHASE_BOARD_R;
129 * spl_prev_phase() - Figure out the previous U-Boot phase
131 * @return the previous phase from this one, e.g. if called in SPL this returns
132 * PHASE_TPL, if TPL is enabled
134 static inline enum u_boot_phase spl_prev_phase(void)
136 #ifdef CONFIG_TPL_BUILD
138 #elif defined(CONFIG_SPL_BUILD)
139 return IS_ENABLED(CONFIG_TPL) ? PHASE_TPL : PHASE_NONE;
141 return IS_ENABLED(CONFIG_SPL) ? PHASE_SPL : PHASE_NONE;
146 * spl_next_phase() - Figure out the next U-Boot phase
148 * @return the next phase from this one, e.g. if called in TPL this returns
151 static inline enum u_boot_phase spl_next_phase(void)
153 #ifdef CONFIG_TPL_BUILD
156 return PHASE_BOARD_F;
161 * spl_phase_name() - Get the name of the current phase
165 static inline const char *spl_phase_name(enum u_boot_phase phase)
181 * spl_phase_prefix() - Get the prefix of the current phase
183 * @phase: Phase to look up
184 * @return phase prefix ("spl", "tpl", etc.)
186 static inline const char *spl_phase_prefix(enum u_boot_phase phase)
201 /* A string name for SPL or TPL */
202 #ifdef CONFIG_SPL_BUILD
203 # ifdef CONFIG_TPL_BUILD
204 # define SPL_TPL_NAME "TPL"
206 # define SPL_TPL_NAME "SPL"
208 # define SPL_TPL_PROMPT SPL_TPL_NAME ": "
210 # define SPL_TPL_NAME ""
211 # define SPL_TPL_PROMPT ""
214 struct spl_image_info {
218 uintptr_t entry_point;
219 #if CONFIG_IS_ENABLED(LOAD_FIT) || CONFIG_IS_ENABLED(LOAD_FIT_FULL)
227 #ifdef CONFIG_SPL_LEGACY_IMAGE_CRC_CHECK
235 * Information required to load data from a device
237 * @dev: Pointer to the device, e.g. struct mmc *
238 * @priv: Private data for the device
239 * @bl_len: Block length for reading in bytes
240 * @filename: Name of the fit image file.
241 * @read: Function to call to read from the device
243 struct spl_load_info {
247 const char *filename;
249 * read() - Read from device
251 * @load: Information about the load state
252 * @sector: Sector number to read from (each @load->bl_len bytes)
253 * @count: Number of sectors to read
254 * @buf: Buffer to read into
255 * @return number of sectors read, 0 on error
257 ulong (*read)(struct spl_load_info *load, ulong sector, ulong count,
262 * We need to know the position of U-Boot in memory so we can jump to it. We
263 * allow any U-Boot binary to be used (u-boot.bin, u-boot-nodtb.bin,
264 * u-boot.img), hence the '_any'. These is no checking here that the correct
265 * image is found. For example if u-boot.img is used we don't check that
266 * spl_parse_image_header() can parse a valid header.
268 * Similarly for SPL, so that TPL can jump to SPL.
270 binman_sym_extern(ulong, u_boot_any, image_pos);
271 binman_sym_extern(ulong, u_boot_any, size);
272 binman_sym_extern(ulong, spl, image_pos);
273 binman_sym_extern(ulong, spl, size);
276 * spl_get_image_pos() - get the image position of the next phase
278 * This returns the image position to use to load the next phase of U-Boot
280 ulong spl_get_image_pos(void);
283 * spl_get_image_size() - get the size of the next phase
285 * This returns the size to use to load the next phase of U-Boot
287 ulong spl_get_image_size(void);
290 * spl_get_image_text_base() - get the text base of the next phase
292 * This returns the address that the next stage is linked to run at, i.e.
293 * CONFIG_SPL_TEXT_BASE or CONFIG_SYS_TEXT_BASE
295 * @return text-base address
297 ulong spl_get_image_text_base(void);
300 * spl_load_simple_fit_skip_processing() - Hook to allow skipping the FIT
301 * image processing during spl_load_simple_fit().
303 * Return true to skip FIT processing, false to preserve the full code flow
304 * of spl_load_simple_fit().
306 bool spl_load_simple_fit_skip_processing(void);
309 * spl_load_simple_fit_fix_load() - Hook to make fixes
310 * after fit image header is loaded
312 * Returns pointer to fit
314 void *spl_load_simple_fit_fix_load(const void *fit);
317 * spl_load_simple_fit() - Loads a fit image from a device.
318 * @spl_image: Image description to set up
319 * @info: Structure containing the information required to load data.
320 * @sector: Sector number where FIT image is located in the device
321 * @fdt: Pointer to the copied FIT header.
323 * Reads the FIT image @sector in the device. Loads u-boot image to
324 * specified load address and copies the dtb to end of u-boot image.
325 * Returns 0 on success.
327 int spl_load_simple_fit(struct spl_image_info *spl_image,
328 struct spl_load_info *info, ulong sector, void *fdt);
330 #define SPL_COPY_PAYLOAD_ONLY 1
331 #define SPL_FIT_FOUND 2
334 * spl_load_legacy_img() - Loads a legacy image from a device.
335 * @spl_image: Image description to set up
336 * @load: Structure containing the information required to load data.
337 * @header: Pointer to image header (including appended image)
339 * Reads an legacy image from the device. Loads u-boot image to
340 * specified load address.
341 * Returns 0 on success.
343 int spl_load_legacy_img(struct spl_image_info *spl_image,
344 struct spl_boot_device *bootdev,
345 struct spl_load_info *load, ulong header);
348 * spl_load_imx_container() - Loads a imx container image from a device.
349 * @spl_image: Image description to set up
350 * @info: Structure containing the information required to load data.
351 * @sector: Sector number where container image is located in the device
353 * Reads the container image @sector in the device. Loads u-boot image to
354 * specified load address.
356 int spl_load_imx_container(struct spl_image_info *spl_image,
357 struct spl_load_info *info, ulong sector);
359 /* SPL common functions */
360 void preloader_console_init(void);
361 u32 spl_boot_device(void);
364 * spl_mmc_boot_mode() - Lookup function for the mode of an MMC boot source.
365 * @boot_device: ID of the device which the MMC driver wants to read
366 * from. Common values are e.g. BOOT_DEVICE_MMC1,
367 * BOOT_DEVICE_MMC2, BOOT_DEVICE_MMC2_2.
369 * This function should return one of MMCSD_MODE_FS, MMCSD_MODE_EMMCBOOT, or
370 * MMCSD_MODE_RAW for each MMC boot source which is defined for the target. The
371 * boot_device parameter tells which device the MMC driver is interested in.
373 * If not overridden, it is weakly defined in common/spl/spl_mmc.c.
375 * Note: It is important to use the boot_device parameter instead of e.g.
376 * spl_boot_device() as U-Boot is not always loaded from the same device as SPL.
378 u32 spl_mmc_boot_mode(const u32 boot_device);
381 * spl_mmc_boot_partition() - MMC partition to load U-Boot from.
382 * @boot_device: ID of the device which the MMC driver wants to load
385 * This function should return the partition number which the SPL
386 * should load U-Boot from (on the given boot_device) when
387 * CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION is set.
389 * If not overridden, it is weakly defined in common/spl/spl_mmc.c.
391 int spl_mmc_boot_partition(const u32 boot_device);
395 * default_spl_mmc_emmc_boot_partition() - eMMC boot partition to load U-Boot from.
396 * mmc: Pointer for the mmc device structure
398 * This function should return the eMMC boot partition number which
399 * the SPL should load U-Boot from (on the given boot_device).
401 int default_spl_mmc_emmc_boot_partition(struct mmc *mmc);
404 * spl_mmc_emmc_boot_partition() - eMMC boot partition to load U-Boot from.
405 * mmc: Pointer for the mmc device structure
407 * This function should return the eMMC boot partition number which
408 * the SPL should load U-Boot from (on the given boot_device).
410 * If not overridden, it is weakly defined in common/spl/spl_mmc.c
411 * and calls default_spl_mmc_emmc_boot_partition();
413 int spl_mmc_emmc_boot_partition(struct mmc *mmc);
415 void spl_set_bd(void);
418 * spl_set_header_raw_uboot() - Set up a standard SPL image structure
420 * This sets up the given spl_image which the standard values obtained from
421 * config options: CONFIG_SYS_MONITOR_LEN, CONFIG_SYS_UBOOT_START,
422 * CONFIG_SYS_TEXT_BASE.
424 * @spl_image: Image description to set up
426 void spl_set_header_raw_uboot(struct spl_image_info *spl_image);
429 * spl_parse_image_header() - parse the image header and set up info
431 * This parses the legacy image header information at @header and sets up
432 * @spl_image according to what is found. If no image header is found, then
433 * a raw image or bootz is assumed. If CONFIG_SPL_PANIC_ON_RAW_IMAGE is
434 * enabled, then this causes a panic. If CONFIG_SPL_RAW_IMAGE_SUPPORT is not
435 * enabled then U-Boot gives up. Otherwise U-Boot sets up the image using
436 * spl_set_header_raw_uboot(), or possibly the bootz header.
438 * @spl_image: Image description to set up
439 * @header image header to parse
440 * @return 0 if a header was correctly parsed, -ve on error
442 int spl_parse_image_header(struct spl_image_info *spl_image,
443 const struct spl_boot_device *bootdev,
444 const struct image_header *header);
446 void spl_board_prepare_for_linux(void);
449 * spl_board_prepare_for_optee() - Prepare board for an OPTEE payload
451 * Prepares the board for booting an OP-TEE payload. Initialization is platform
452 * specific, and may include configuring the TrustZone memory, and other
453 * initialization steps required by OP-TEE.
454 * Note that @fdt is not used directly by OP-TEE. OP-TEE passes this @fdt to
455 * its normal world target. This target is not guaranteed to be u-boot, so @fdt
456 * changes that would normally be done by u-boot should be done in this step.
458 * @fdt: Devicetree that will be passed on, or NULL
460 void spl_board_prepare_for_optee(void *fdt);
461 void spl_board_prepare_for_boot(void);
462 int spl_board_ubi_load_image(u32 boot_device);
463 int spl_board_boot_device(u32 boot_device);
466 * jump_to_image_linux() - Jump to a Linux kernel from SPL
468 * This jumps into a Linux kernel using the information in @spl_image.
470 * @spl_image: Image description to set up
472 void __noreturn jump_to_image_linux(struct spl_image_info *spl_image);
475 * jump_to_image_linux() - Jump to OP-TEE OS from SPL
477 * This jumps into OP-TEE OS using the information in @spl_image.
479 * @spl_image: Image description to set up
481 void __noreturn jump_to_image_optee(struct spl_image_info *spl_image);
484 * spl_start_uboot() - Check if SPL should start the kernel or U-Boot
486 * This is called by the various SPL loaders to determine whether the board
487 * wants to load the kernel or U-Boot. This function should be provided by
490 * @return 0 if SPL should start the kernel, 1 if U-Boot must be started
492 int spl_start_uboot(void);
495 * spl_display_print() - Display a board-specific message in SPL
497 * If CONFIG_SPL_DISPLAY_PRINT is enabled, U-Boot will call this function
498 * immediately after displaying the SPL console banner ("U-Boot SPL ...").
499 * This function should be provided by the board.
501 void spl_display_print(void);
504 * struct spl_boot_device - Describes a boot device used by SPL
506 * @boot_device: A number indicating the BOOT_DEVICE type. There are various
507 * BOOT_DEVICE... #defines and enums in U-Boot and they are not consistently
509 * @boot_device_name: Named boot device, or NULL if none.
511 * Note: Additional fields can be added here, bearing in mind that SPL is
512 * size-sensitive and common fields will be present on all boards. This
513 * struct can also be used to return additional information about the load
514 * process if that becomes useful.
516 struct spl_boot_device {
518 const char *boot_device_name;
522 * Holds information about a way of loading an SPL image
524 * @name: User-friendly name for this method (e.g. "MMC")
525 * @boot_device: Boot device that this loader supports
526 * @load_image: Function to call to load image
528 struct spl_image_loader {
529 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
534 * load_image() - Load an SPL image
536 * @spl_image: place to put image information
537 * @bootdev: describes the boot device to load from
539 int (*load_image)(struct spl_image_info *spl_image,
540 struct spl_boot_device *bootdev);
543 /* Helper function for accessing the name */
544 static inline const char *spl_loader_name(const struct spl_image_loader *loader)
546 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
553 /* Declare an SPL image loader */
554 #define SPL_LOAD_IMAGE(__name) \
555 ll_entry_declare(struct spl_image_loader, __name, spl_image_loader)
558 * _priority is the priority of this method, 0 meaning it will be the top
559 * choice for this device, 9 meaning it is the bottom choice.
560 * _boot_device is the BOOT_DEVICE_... value
561 * _method is the load_image function to call
563 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
564 #define SPL_LOAD_IMAGE_METHOD(_name, _priority, _boot_device, _method) \
565 SPL_LOAD_IMAGE(_boot_device ## _priority ## _method) = { \
567 .boot_device = _boot_device, \
568 .load_image = _method, \
571 #define SPL_LOAD_IMAGE_METHOD(_name, _priority, _boot_device, _method) \
572 SPL_LOAD_IMAGE(_boot_device ## _priority ## _method) = { \
573 .boot_device = _boot_device, \
574 .load_image = _method, \
578 /* SPL FAT image functions */
579 int spl_load_image_fat(struct spl_image_info *spl_image,
580 struct spl_boot_device *bootdev,
581 struct blk_desc *block_dev, int partition,
582 const char *filename);
583 int spl_load_image_fat_os(struct spl_image_info *spl_image,
584 struct spl_boot_device *bootdev,
585 struct blk_desc *block_dev, int partition);
587 void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image);
589 /* SPL EXT image functions */
590 int spl_load_image_ext(struct spl_image_info *spl_image,
591 struct spl_boot_device *bootdev,
592 struct blk_desc *block_dev, int partition,
593 const char *filename);
594 int spl_load_image_ext_os(struct spl_image_info *spl_image,
595 struct spl_boot_device *bootdev,
596 struct blk_desc *block_dev, int partition);
599 * spl_early_init() - Set up device tree and driver model in SPL if enabled
601 * Call this function in board_init_f() if you want to use device tree and
602 * driver model early, before board_init_r() is called.
604 * If this is not called, then driver model will be inactive in SPL's
605 * board_init_f(), and no device tree will be available.
607 int spl_early_init(void);
610 * spl_init() - Set up device tree and driver model in SPL if enabled
612 * You can optionally call spl_early_init(), then optionally call spl_init().
613 * This function will be called from board_init_r() if not called earlier.
615 * Both spl_early_init() and spl_init() perform a similar function except that
616 * the latter will not set up the malloc() area if
617 * CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN is enabled, since it is assumed to
618 * already be done by a calll to spl_relocate_stack_gd() before board_init_r()
621 * This function will be called from board_init_r() if not called earlier.
623 * If this is not called, then driver model will be inactive in SPL's
624 * board_init_f(), and no device tree will be available.
628 #ifdef CONFIG_SPL_BOARD_INIT
629 void spl_board_init(void);
633 * spl_was_boot_source() - check if U-Boot booted from SPL
635 * This will normally be true, but if U-Boot jumps to second U-Boot, it will
636 * be false. This should be implemented by board-specific code.
638 * @return true if U-Boot booted from SPL, else false
640 bool spl_was_boot_source(void);
643 * spl_dfu_cmd- run dfu command with chosen mmc device interface
644 * @param usb_index - usb controller number
645 * @param mmc_dev - mmc device nubmer
647 * @return 0 on success, otherwise error code
649 int spl_dfu_cmd(int usbctrl, char *dfu_alt_info, char *interface, char *devstr);
651 int spl_mmc_load_image(struct spl_image_info *spl_image,
652 struct spl_boot_device *bootdev);
655 * spl_mmc_load() - Load an image file from MMC/SD media
657 * @param spl_image Image data filled in by loading process
658 * @param bootdev Describes which device to load from
659 * @param filename Name of file to load (in FS mode)
660 * @param raw_part Partition to load from (in RAW mode)
661 * @param raw_sect Sector to load from (in RAW mode)
663 * @return 0 on success, otherwise error code
665 int spl_mmc_load(struct spl_image_info *spl_image,
666 struct spl_boot_device *bootdev,
667 const char *filename,
669 unsigned long raw_sect);
672 * spl_usb_load() - Load an image file from USB mass storage
674 * @param spl_image Image data filled in by loading process
675 * @param bootdev Describes which device to load from
676 * @param raw_part Fat partition to load from
677 * @param filename Name of file to load
679 * @return 0 on success, otherwise error code
681 int spl_usb_load(struct spl_image_info *spl_image,
682 struct spl_boot_device *bootdev,
683 int partition, const char *filename);
685 int spl_ymodem_load_image(struct spl_image_info *spl_image,
686 struct spl_boot_device *bootdev);
689 * spl_invoke_atf - boot using an ARM trusted firmware image
691 void spl_invoke_atf(struct spl_image_info *spl_image);
694 * bl2_plat_get_bl31_params() - return params for bl31.
695 * @bl32_entry: address of BL32 executable (secure)
696 * @bl33_entry: address of BL33 executable (non secure)
697 * @fdt_addr: address of Flat Device Tree
699 * This is a weak function which might be overridden by the board code. By
700 * default it will just call bl2_plat_get_bl31_params_default().
702 * If you just want to manipulate or add some parameters, you can override
703 * this function, call bl2_plat_get_bl31_params_default and operate on the
704 * returned bl31 params.
706 * Return: bl31 params structure pointer
708 struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl32_entry,
709 uintptr_t bl33_entry,
713 * bl2_plat_get_bl31_params_default() - prepare params for bl31.
714 * @bl32_entry: address of BL32 executable (secure)
715 * @bl33_entry: address of BL33 executable (non secure)
716 * @fdt_addr: address of Flat Device Tree
718 * This is the default implementation of bl2_plat_get_bl31_params(). It assigns
719 * a pointer to the memory that the platform has kept aside to pass platform
720 * specific and trusted firmware related information to BL31. This memory is
721 * allocated by allocating memory to bl2_to_bl31_params_mem structure which is
722 * a superset of all the structure whose information is passed to BL31
724 * NOTE: The memory is statically allocated, thus this function should be
725 * called only once. All subsequent calls will overwrite any changes.
727 * Return: bl31 params structure pointer
729 struct bl31_params *bl2_plat_get_bl31_params_default(uintptr_t bl32_entry,
730 uintptr_t bl33_entry,
734 * bl2_plat_get_bl31_params_v2() - return params for bl31
735 * @bl32_entry: address of BL32 executable (secure)
736 * @bl33_entry: address of BL33 executable (non secure)
737 * @fdt_addr: address of Flat Device Tree
739 * This function does the same as bl2_plat_get_bl31_params() except that is is
740 * used for the new LOAD_IMAGE_V2 option, which uses a slightly different
741 * method to pass the parameters.
743 * Return: bl31 params structure pointer
745 struct bl_params *bl2_plat_get_bl31_params_v2(uintptr_t bl32_entry,
746 uintptr_t bl33_entry,
750 * bl2_plat_get_bl31_params_v2_default() - prepare params for bl31.
751 * @bl32_entry: address of BL32 executable (secure)
752 * @bl33_entry: address of BL33 executable (non secure)
753 * @fdt_addr: address of Flat Device Tree
755 * This is the default implementation of bl2_plat_get_bl31_params_v2(). It
756 * prepares the linked list of the bl31 params, populates the image types and
757 * set the entry points for bl32 and bl33 (if available).
759 * NOTE: The memory is statically allocated, thus this function should be
760 * called only once. All subsequent calls will overwrite any changes.
762 * Return: bl31 params structure pointer
764 struct bl_params *bl2_plat_get_bl31_params_v2_default(uintptr_t bl32_entry,
765 uintptr_t bl33_entry,
768 * spl_optee_entry - entry function for optee
770 * args defind in op-tee project
771 * https://github.com/OP-TEE/optee_os/
772 * core/arch/arm/kernel/generic_entry_a32.S
774 * @arg1: (ARMv7 standard bootarg #1)
775 * @arg2: device tree address, (ARMv7 standard bootarg #2)
776 * @arg3: non-secure entry address (ARMv7 bootarg #0)
778 void __noreturn spl_optee_entry(void *arg0, void *arg1, void *arg2, void *arg3);
781 * spl_invoke_opensbi - boot using a RISC-V OpenSBI image
783 void spl_invoke_opensbi(struct spl_image_info *spl_image);
786 * board_return_to_bootrom - allow for boards to continue with the boot ROM
788 * If a board (e.g. the Rockchip RK3368 boards) provide some
789 * supporting functionality for SPL in their boot ROM and the SPL
790 * stage wants to return to the ROM code to continue booting, boards
791 * can implement 'board_return_to_bootrom'.
793 int board_return_to_bootrom(struct spl_image_info *spl_image,
794 struct spl_boot_device *bootdev);
797 * board_spl_fit_post_load - allow process images after loading finished
798 * @fit: Pointer to a valid Flattened Image Tree blob
800 void board_spl_fit_post_load(const void *fit);
803 * board_spl_fit_size_align - specific size align before processing payload
806 ulong board_spl_fit_size_align(ulong size);
809 * spl_perform_fixups() - arch/board-specific callback before processing
812 void spl_perform_fixups(struct spl_image_info *spl_image);
815 * spl_get_load_buffer() - get buffer for loading partial image data
817 * Returns memory area which can be populated by partial image data,
818 * ie. uImage or fitImage header.
820 struct image_header *spl_get_load_buffer(ssize_t offset, size_t size);
822 void spl_save_restore_data(void);